xref: /external/chromium_org/components/autofill/core/browser/webdata/autofill_table.cc

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/autofill/core/browser/webdata/autofill_table.h"

#include <algorithm>
#include <cmath>
#include <limits>
#include <map>
#include <set>
#include <string>
#include <vector>

#include "base/guid.h"
#include "base/i18n/case_conversion.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "base/tuple.h"
#include "components/autofill/core/browser/autofill_country.h"
#include "components/autofill/core/browser/autofill_profile.h"
#include "components/autofill/core/browser/autofill_type.h"
#include "components/autofill/core/browser/credit_card.h"
#include "components/autofill/core/browser/personal_data_manager.h"
#include "components/autofill/core/browser/webdata/autofill_change.h"
#include "components/autofill/core/browser/webdata/autofill_entry.h"
#include "components/autofill/core/common/form_field_data.h"
#include "components/os_crypt/os_crypt.h"
#include "components/webdata/common/web_database.h"
#include "sql/statement.h"
#include "sql/transaction.h"
#include "ui/base/l10n/l10n_util.h"
#include "url/gurl.h"

using base::Time;

namespace autofill {
namespace {

// The period after which Autofill entries should expire in days.
const int64 kExpirationPeriodInDays = 60;

template<typename T>
T* address_of(T& v) {
  return &v;
}

// Helper struct for AutofillTable::RemoveFormElementsAddedBetween().
// Contains all the necessary fields to update a row in the 'autofill' table.
struct AutofillUpdate {
  base::string16 name;
  base::string16 value;
  time_t date_created;
  time_t date_last_used;
  int count;
};

// Rounds a positive floating point number to the nearest integer.
int Round(float f) {
  DCHECK_GE(f, 0.f);
  return base::checked_cast<int>(std::floor(f + 0.5f));
}

// Returns the |data_model|'s value corresponding to the |type|, trimmed to the
// maximum length that can be stored in a column of the Autofill database.
base::string16 GetInfo(const AutofillDataModel& data_model,
                       ServerFieldType type) {
  base::string16 data = data_model.GetRawInfo(type);
  if (data.size() > AutofillTable::kMaxDataLength)
    return data.substr(0, AutofillTable::kMaxDataLength);

  return data;
}

void BindAutofillProfileToStatement(const AutofillProfile& profile,
                                    sql::Statement* s) {
  DCHECK(base::IsValidGUID(profile.guid()));
  int index = 0;
  s->BindString(index++, profile.guid());

  s->BindString16(index++, GetInfo(profile, COMPANY_NAME));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_STREET_ADDRESS));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_DEPENDENT_LOCALITY));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_CITY));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_STATE));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_ZIP));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_SORTING_CODE));
  s->BindString16(index++, GetInfo(profile, ADDRESS_HOME_COUNTRY));
  s->BindInt64(index++, Time::Now().ToTimeT());
  s->BindString(index++, profile.origin());
  s->BindString(index++, profile.language_code());
}

scoped_ptr<AutofillProfile> AutofillProfileFromStatement(
    const sql::Statement& s) {
  scoped_ptr<AutofillProfile> profile(new AutofillProfile);
  int index = 0;
  profile->set_guid(s.ColumnString(index++));
  DCHECK(base::IsValidGUID(profile->guid()));

  profile->SetRawInfo(COMPANY_NAME, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_STREET_ADDRESS, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_DEPENDENT_LOCALITY,
                      s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_CITY, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_STATE, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_ZIP, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_SORTING_CODE, s.ColumnString16(index++));
  profile->SetRawInfo(ADDRESS_HOME_COUNTRY, s.ColumnString16(index++));
  // Intentionally skip column 9, which stores the profile's modification date.
  index++;
  profile->set_origin(s.ColumnString(index++));
  profile->set_language_code(s.ColumnString(index++));

  return profile.Pass();
}

void BindCreditCardToStatement(const CreditCard& credit_card,
                               sql::Statement* s) {
  DCHECK(base::IsValidGUID(credit_card.guid()));
  int index = 0;
  s->BindString(index++, credit_card.guid());

  s->BindString16(index++, GetInfo(credit_card, CREDIT_CARD_NAME));
  s->BindString16(index++, GetInfo(credit_card, CREDIT_CARD_EXP_MONTH));
  s->BindString16(index++, GetInfo(credit_card, CREDIT_CARD_EXP_4_DIGIT_YEAR));

  std::string encrypted_data;
  OSCrypt::EncryptString16(credit_card.GetRawInfo(CREDIT_CARD_NUMBER),
                           &encrypted_data);
  s->BindBlob(index++, encrypted_data.data(),
              static_cast<int>(encrypted_data.length()));

  s->BindInt64(index++, Time::Now().ToTimeT());
  s->BindString(index++, credit_card.origin());
}

scoped_ptr<CreditCard> CreditCardFromStatement(const sql::Statement& s) {
  scoped_ptr<CreditCard> credit_card(new CreditCard);

  int index = 0;
  credit_card->set_guid(s.ColumnString(index++));
  DCHECK(base::IsValidGUID(credit_card->guid()));

  credit_card->SetRawInfo(CREDIT_CARD_NAME, s.ColumnString16(index++));
  credit_card->SetRawInfo(CREDIT_CARD_EXP_MONTH, s.ColumnString16(index++));
  credit_card->SetRawInfo(CREDIT_CARD_EXP_4_DIGIT_YEAR,
                          s.ColumnString16(index++));
  int encrypted_number_len = s.ColumnByteLength(index);
  base::string16 credit_card_number;
  if (encrypted_number_len) {
    std::string encrypted_number;
    encrypted_number.resize(encrypted_number_len);
    memcpy(&encrypted_number[0], s.ColumnBlob(index++), encrypted_number_len);
    OSCrypt::DecryptString16(encrypted_number, &credit_card_number);
  } else {
    index++;
  }
  credit_card->SetRawInfo(CREDIT_CARD_NUMBER, credit_card_number);
  // Intentionally skip column 5, which stores the modification date.
  index++;
  credit_card->set_origin(s.ColumnString(index++));

  return credit_card.Pass();
}

// Obsolete version of AddAutofillProfileNamesToProfile, but still needed
// for MigrateToVersion37MergeAndCullOlderProfiles().
bool AddAutofillProfileNamesToProfileForVersion37(sql::Connection* db,
                                                  AutofillProfile* profile) {
  sql::Statement s(db->GetUniqueStatement(
      "SELECT guid, first_name, middle_name, last_name "
      "FROM autofill_profile_names "
      "WHERE guid=?"));
  s.BindString(0, profile->guid());

  if (!s.is_valid())
    return false;

  std::vector<base::string16> first_names;
  std::vector<base::string16> middle_names;
  std::vector<base::string16> last_names;
  while (s.Step()) {
    DCHECK_EQ(profile->guid(), s.ColumnString(0));
    first_names.push_back(s.ColumnString16(1));
    middle_names.push_back(s.ColumnString16(2));
    last_names.push_back(s.ColumnString16(3));
  }
  if (!s.Succeeded())
    return false;

  profile->SetRawMultiInfo(NAME_FIRST, first_names);
  profile->SetRawMultiInfo(NAME_MIDDLE, middle_names);
  profile->SetRawMultiInfo(NAME_LAST, last_names);
  return true;
}

bool AddAutofillProfileNamesToProfile(sql::Connection* db,
                                      AutofillProfile* profile) {
  sql::Statement s(db->GetUniqueStatement(
      "SELECT guid, first_name, middle_name, last_name, full_name "
      "FROM autofill_profile_names "
      "WHERE guid=?"));
  s.BindString(0, profile->guid());

  if (!s.is_valid())
    return false;

  std::vector<base::string16> first_names;
  std::vector<base::string16> middle_names;
  std::vector<base::string16> last_names;
  std::vector<base::string16> full_names;
  while (s.Step()) {
    DCHECK_EQ(profile->guid(), s.ColumnString(0));
    first_names.push_back(s.ColumnString16(1));
    middle_names.push_back(s.ColumnString16(2));
    last_names.push_back(s.ColumnString16(3));
    full_names.push_back(s.ColumnString16(4));
  }
  if (!s.Succeeded())
    return false;

  profile->SetRawMultiInfo(NAME_FIRST, first_names);
  profile->SetRawMultiInfo(NAME_MIDDLE, middle_names);
  profile->SetRawMultiInfo(NAME_LAST, last_names);
  profile->SetRawMultiInfo(NAME_FULL, full_names);
  return true;
}

bool AddAutofillProfileEmailsToProfile(sql::Connection* db,
                                       AutofillProfile* profile) {
  sql::Statement s(db->GetUniqueStatement(
      "SELECT guid, email "
      "FROM autofill_profile_emails "
      "WHERE guid=?"));
  s.BindString(0, profile->guid());

  if (!s.is_valid())
    return false;

  std::vector<base::string16> emails;
  while (s.Step()) {
    DCHECK_EQ(profile->guid(), s.ColumnString(0));
    emails.push_back(s.ColumnString16(1));
  }
  if (!s.Succeeded())
    return false;

  profile->SetRawMultiInfo(EMAIL_ADDRESS, emails);
  return true;
}

bool AddAutofillProfilePhonesToProfile(sql::Connection* db,
                                       AutofillProfile* profile) {
  sql::Statement s(db->GetUniqueStatement(
      "SELECT guid, number "
      "FROM autofill_profile_phones "
      "WHERE guid=?"));
  s.BindString(0, profile->guid());

  if (!s.is_valid())
    return false;

  std::vector<base::string16> numbers;
  while (s.Step()) {
    DCHECK_EQ(profile->guid(), s.ColumnString(0));
    numbers.push_back(s.ColumnString16(1));
  }
  if (!s.Succeeded())
    return false;

  profile->SetRawMultiInfo(PHONE_HOME_WHOLE_NUMBER, numbers);
  return true;
}

// Obsolete version of AddAutofillProfileNames needed for
// MigrateToVersion33ProfilesBasedOnFirstName() and
// MigrateToVersion37MergeAndCullOlderProfiles().
bool AddAutofillProfileNamesForVersion3x(
    const AutofillProfile& profile,
    sql::Connection* db) {
  std::vector<base::string16> first_names;
  profile.GetRawMultiInfo(NAME_FIRST, &first_names);
  std::vector<base::string16> middle_names;
  profile.GetRawMultiInfo(NAME_MIDDLE, &middle_names);
  std::vector<base::string16> last_names;
  profile.GetRawMultiInfo(NAME_LAST, &last_names);
  DCHECK_EQ(first_names.size(), middle_names.size());
  DCHECK_EQ(first_names.size(), last_names.size());

  for (size_t i = 0; i < first_names.size(); ++i) {
    // Add the new name.
    sql::Statement s(db->GetUniqueStatement(
        "INSERT INTO autofill_profile_names"
        " (guid, first_name, middle_name, last_name) "
        "VALUES (?,?,?,?)"));
    s.BindString(0, profile.guid());
    s.BindString16(1, first_names[i]);
    s.BindString16(2, middle_names[i]);
    s.BindString16(3, last_names[i]);

    if (!s.Run())
      return false;
  }
  return true;
}

bool AddAutofillProfileNames(const AutofillProfile& profile,
                             sql::Connection* db) {
  std::vector<base::string16> first_names;
  profile.GetRawMultiInfo(NAME_FIRST, &first_names);
  std::vector<base::string16> middle_names;
  profile.GetRawMultiInfo(NAME_MIDDLE, &middle_names);
  std::vector<base::string16> last_names;
  profile.GetRawMultiInfo(NAME_LAST, &last_names);
  std::vector<base::string16> full_names;
  profile.GetRawMultiInfo(NAME_FULL, &full_names);
  DCHECK_EQ(first_names.size(), middle_names.size());
  DCHECK_EQ(first_names.size(), last_names.size());
  DCHECK_EQ(first_names.size(), full_names.size());

  for (size_t i = 0; i < first_names.size(); ++i) {
    // Add the new name.
    sql::Statement s(db->GetUniqueStatement(
        "INSERT INTO autofill_profile_names"
        " (guid, first_name, middle_name, last_name, full_name) "
        "VALUES (?,?,?,?,?)"));
    s.BindString(0, profile.guid());
    s.BindString16(1, first_names[i]);
    s.BindString16(2, middle_names[i]);
    s.BindString16(3, last_names[i]);
    s.BindString16(4, full_names[i]);

    if (!s.Run())
      return false;
  }
  return true;
}

bool AddAutofillProfileEmails(const AutofillProfile& profile,
                              sql::Connection* db) {
  std::vector<base::string16> emails;
  profile.GetRawMultiInfo(EMAIL_ADDRESS, &emails);

  for (size_t i = 0; i < emails.size(); ++i) {
    // Add the new email.
    sql::Statement s(db->GetUniqueStatement(
      "INSERT INTO autofill_profile_emails"
      " (guid, email) "
      "VALUES (?,?)"));
    s.BindString(0, profile.guid());
    s.BindString16(1, emails[i]);

    if (!s.Run())
      return false;
  }

  return true;
}

bool AddAutofillProfilePhones(const AutofillProfile& profile,
                              sql::Connection* db) {
  std::vector<base::string16> numbers;
  profile.GetRawMultiInfo(PHONE_HOME_WHOLE_NUMBER, &numbers);

  for (size_t i = 0; i < numbers.size(); ++i) {
    // Add the new number.
    sql::Statement s(db->GetUniqueStatement(
      "INSERT INTO autofill_profile_phones"
      " (guid, number) "
      "VALUES (?,?)"));
    s.BindString(0, profile.guid());
    s.BindString16(1, numbers[i]);

    if (!s.Run())
      return false;
  }

  return true;
}

bool AddAutofillProfilePieces(const AutofillProfile& profile,
                              sql::Connection* db) {
  if (!AddAutofillProfileNames(profile, db))
    return false;

  if (!AddAutofillProfileEmails(profile, db))
    return false;

  if (!AddAutofillProfilePhones(profile, db))
    return false;

  return true;
}

bool RemoveAutofillProfilePieces(const std::string& guid, sql::Connection* db) {
  sql::Statement s1(db->GetUniqueStatement(
      "DELETE FROM autofill_profile_names WHERE guid = ?"));
  s1.BindString(0, guid);

  if (!s1.Run())
    return false;

  sql::Statement s2(db->GetUniqueStatement(
      "DELETE FROM autofill_profile_emails WHERE guid = ?"));
  s2.BindString(0, guid);

  if (!s2.Run())
    return false;

  sql::Statement s3(db->GetUniqueStatement(
      "DELETE FROM autofill_profile_phones WHERE guid = ?"));
  s3.BindString(0, guid);

  return s3.Run();
}

WebDatabaseTable::TypeKey GetKey() {
  // We just need a unique constant. Use the address of a static that
  // COMDAT folding won't touch in an optimizing linker.
  static int table_key = 0;
  return reinterpret_cast<void*>(&table_key);
}

time_t GetEndTime(const base::Time& end) {
  if (end.is_null() || end == base::Time::Max())
    return std::numeric_limits<time_t>::max();

  return end.ToTimeT();
}

}  // namespace

// The maximum length allowed for form data.
const size_t AutofillTable::kMaxDataLength = 1024;

AutofillTable::AutofillTable(const std::string& app_locale)
    : app_locale_(app_locale) {
}

AutofillTable::~AutofillTable() {
}

AutofillTable* AutofillTable::FromWebDatabase(WebDatabase* db) {
  return static_cast<AutofillTable*>(db->GetTable(GetKey()));
}

WebDatabaseTable::TypeKey AutofillTable::GetTypeKey() const {
  return GetKey();
}

bool AutofillTable::CreateTablesIfNecessary() {
  return (InitMainTable() && InitCreditCardsTable() && InitProfilesTable() &&
          InitProfileNamesTable() && InitProfileEmailsTable() &&
          InitProfilePhonesTable() && InitProfileTrashTable());
}

bool AutofillTable::IsSyncable() {
  return true;
}

bool AutofillTable::MigrateToVersion(int version,
                                     bool* update_compatible_version) {
  // Migrate if necessary.
  switch (version) {
    case 22:
      return MigrateToVersion22ClearAutofillEmptyValueElements();
    case 23:
      return MigrateToVersion23AddCardNumberEncryptedColumn();
    case 24:
      return MigrateToVersion24CleanupOversizedStringFields();
    case 27:
      *update_compatible_version = true;
      return MigrateToVersion27UpdateLegacyCreditCards();
    case 30:
      *update_compatible_version = true;
      return MigrateToVersion30AddDateModifed();
    case 31:
      *update_compatible_version = true;
      return MigrateToVersion31AddGUIDToCreditCardsAndProfiles();
    case 32:
      *update_compatible_version = true;
      return MigrateToVersion32UpdateProfilesAndCreditCards();
    case 33:
      *update_compatible_version = true;
      return MigrateToVersion33ProfilesBasedOnFirstName();
    case 34:
      *update_compatible_version = true;
      return MigrateToVersion34ProfilesBasedOnCountryCode();
    case 35:
      *update_compatible_version = true;
      return MigrateToVersion35GreatBritainCountryCodes();
    // Combine migrations 36 and 37.  This is due to enhancements to the merge
    // step when migrating profiles.  The original migration from 35 to 36 did
    // not merge profiles with identical addresses, but the migration from 36 to
    // 37 does.  The step from 35 to 36 should only happen on the Chrome 12 dev
    // channel.  Chrome 12 beta and release users will jump from 35 to 37
    // directly getting the full benefits of the multi-valued merge as well as
    // the culling of bad data.
    case 37:
      *update_compatible_version = true;
      return MigrateToVersion37MergeAndCullOlderProfiles();
    case 51:
      // Combine migrations 50 and 51.  The migration code from version 49 to 50
      // worked correctly for users with existing 'origin' columns, but failed
      // to create these columns for new users.
      return MigrateToVersion51AddOriginColumn();
    case 54:
      *update_compatible_version = true;
      return MigrateToVersion54AddI18nFieldsAndRemoveDeprecatedFields();
    case 55:
      *update_compatible_version = true;
      return MigrateToVersion55MergeAutofillDatesTable();
    case 56:
      *update_compatible_version = true;
      return MigrateToVersion56AddProfileLanguageCodeForFormatting();
    case 57:
      *update_compatible_version = true;
      return MigrateToVersion57AddFullNameField();
  }
  return true;
}

bool AutofillTable::AddFormFieldValues(
    const std::vector<FormFieldData>& elements,
    std::vector<AutofillChange>* changes) {
  return AddFormFieldValuesTime(elements, changes, Time::Now());
}

bool AutofillTable::AddFormFieldValue(const FormFieldData& element,
                                      std::vector<AutofillChange>* changes) {
  return AddFormFieldValueTime(element, changes, Time::Now());
}

bool AutofillTable::GetFormValuesForElementName(
    const base::string16& name,
    const base::string16& prefix,
    std::vector<base::string16>* values,
    int limit) {
  DCHECK(values);
  sql::Statement s;

  if (prefix.empty()) {
    s.Assign(db_->GetUniqueStatement(
        "SELECT value FROM autofill "
        "WHERE name = ? "
        "ORDER BY count DESC "
        "LIMIT ?"));
    s.BindString16(0, name);
    s.BindInt(1, limit);
  } else {
    base::string16 prefix_lower = base::i18n::ToLower(prefix);
    base::string16 next_prefix = prefix_lower;
    next_prefix[next_prefix.length() - 1]++;

    s.Assign(db_->GetUniqueStatement(
        "SELECT value FROM autofill "
        "WHERE name = ? AND "
        "value_lower >= ? AND "
        "value_lower < ? "
        "ORDER BY count DESC "
        "LIMIT ?"));
    s.BindString16(0, name);
    s.BindString16(1, prefix_lower);
    s.BindString16(2, next_prefix);
    s.BindInt(3, limit);
  }

  values->clear();
  while (s.Step())
    values->push_back(s.ColumnString16(0));
  return s.Succeeded();
}

bool AutofillTable::HasFormElements() {
  sql::Statement s(db_->GetUniqueStatement("SELECT COUNT(*) FROM autofill"));
  if (!s.Step()) {
    NOTREACHED();
    return false;
  }
  return s.ColumnInt(0) > 0;
}

bool AutofillTable::RemoveFormElementsAddedBetween(
    const Time& delete_begin,
    const Time& delete_end,
    std::vector<AutofillChange>* changes) {
  const time_t delete_begin_time_t = delete_begin.ToTimeT();
  const time_t delete_end_time_t = GetEndTime(delete_end);

  // Query for the name, value, count, and access dates of all form elements
  // that were used between the given times.
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT name, value, count, date_created, date_last_used FROM autofill "
      "WHERE (date_created >= ? AND date_created < ?) OR "
      "      (date_last_used >= ? AND date_last_used < ?)"));
  s.BindInt64(0, delete_begin_time_t);
  s.BindInt64(1, delete_end_time_t);
  s.BindInt64(2, delete_begin_time_t);
  s.BindInt64(3, delete_end_time_t);

  std::vector<AutofillUpdate> updates;
  std::vector<AutofillChange> tentative_changes;
  while (s.Step()) {
    base::string16 name = s.ColumnString16(0);
    base::string16 value = s.ColumnString16(1);
    int count = s.ColumnInt(2);
    time_t date_created_time_t = s.ColumnInt64(3);
    time_t date_last_used_time_t = s.ColumnInt64(4);

    // If *all* uses of the element were between |delete_begin| and
    // |delete_end|, then delete the element.  Otherwise, update the use
    // timestamps and use count.
    AutofillChange::Type change_type;
    if (date_created_time_t >= delete_begin_time_t &&
        date_last_used_time_t < delete_end_time_t) {
      change_type = AutofillChange::REMOVE;
    } else {
      change_type = AutofillChange::UPDATE;

      // For all updated elements, set either date_created or date_last_used so
      // that the range [date_created, date_last_used] no longer overlaps with
      // [delete_begin, delete_end). Update the count by interpolating.
      // Precisely, compute the average amount of time between increments to the
      // count in the original range [date_created, date_last_used]:
      //   avg_delta = (date_last_used_orig - date_created_orig) / (count - 1)
      // The count can be expressed as
      //   count = 1 + (date_last_used - date_created) / avg_delta
      // Hence, update the count to
      //   count_new = 1 + (date_last_used_new - date_created_new) / avg_delta
      //             = 1 + ((count - 1) *
      //                    (date_last_used_new - date_created_new) /
      //                    (date_last_used_orig - date_created_orig))
      // Interpolating might not give a result that completely accurately
      // reflects the user's history, but it's the best that can be done given
      // the information in the database.
      AutofillUpdate updated_entry;
      updated_entry.name = name;
      updated_entry.value = value;
      updated_entry.date_created =
          date_created_time_t < delete_begin_time_t ?
          date_created_time_t :
          delete_end_time_t;
      updated_entry.date_last_used =
          date_last_used_time_t >= delete_end_time_t ?
          date_last_used_time_t :
          delete_begin_time_t - 1;
      updated_entry.count =
          1 +
          Round(1.0 * (count - 1) *
                (updated_entry.date_last_used - updated_entry.date_created) /
                (date_last_used_time_t - date_created_time_t));
      updates.push_back(updated_entry);
    }

    tentative_changes.push_back(
        AutofillChange(change_type, AutofillKey(name, value)));
  }
  if (!s.Succeeded())
    return false;

  // As a single transaction, remove or update the elements appropriately.
  sql::Statement s_delete(db_->GetUniqueStatement(
      "DELETE FROM autofill WHERE date_created >= ? AND date_last_used < ?"));
  s_delete.BindInt64(0, delete_begin_time_t);
  s_delete.BindInt64(1, delete_end_time_t);
  sql::Transaction transaction(db_);
  if (!transaction.Begin())
    return false;
  if (!s_delete.Run())
    return false;
  for (size_t i = 0; i < updates.size(); ++i) {
    sql::Statement s_update(db_->GetUniqueStatement(
      "UPDATE autofill SET date_created = ?, date_last_used = ?, count = ?"
      "WHERE name = ? AND value = ?"));
    s_update.BindInt64(0, updates[i].date_created);
    s_update.BindInt64(1, updates[i].date_last_used);
    s_update.BindInt(2, updates[i].count);
    s_update.BindString16(3, updates[i].name);
    s_update.BindString16(4, updates[i].value);
    if (!s_update.Run())
      return false;
  }
  if (!transaction.Commit())
    return false;

  *changes = tentative_changes;
  return true;
}

bool AutofillTable::RemoveExpiredFormElements(
    std::vector<AutofillChange>* changes) {
  base::Time expiration_time =
      base::Time::Now() - base::TimeDelta::FromDays(kExpirationPeriodInDays);

  // Query for the name and value of all form elements that were last used
  // before the |expiration_time|.
  sql::Statement select_for_delete(db_->GetUniqueStatement(
      "SELECT name, value FROM autofill WHERE date_last_used < ?"));
  select_for_delete.BindInt64(0, expiration_time.ToTimeT());
  std::vector<AutofillChange> tentative_changes;
  while (select_for_delete.Step()) {
    base::string16 name = select_for_delete.ColumnString16(0);
    base::string16 value = select_for_delete.ColumnString16(1);
    tentative_changes.push_back(
        AutofillChange(AutofillChange::REMOVE, AutofillKey(name, value)));
  }

  if (!select_for_delete.Succeeded())
    return false;

  sql::Statement delete_data_statement(db_->GetUniqueStatement(
      "DELETE FROM autofill WHERE date_last_used < ?"));
  delete_data_statement.BindInt64(0, expiration_time.ToTimeT());
  if (!delete_data_statement.Run())
    return false;

  *changes = tentative_changes;
  return true;
}

bool AutofillTable::AddFormFieldValuesTime(
    const std::vector<FormFieldData>& elements,
    std::vector<AutofillChange>* changes,
    Time time) {
  // Only add one new entry for each unique element name.  Use |seen_names| to
  // track this.  Add up to |kMaximumUniqueNames| unique entries per form.
  const size_t kMaximumUniqueNames = 256;
  std::set<base::string16> seen_names;
  bool result = true;
  for (std::vector<FormFieldData>::const_iterator itr = elements.begin();
       itr != elements.end(); ++itr) {
    if (seen_names.size() >= kMaximumUniqueNames)
      break;
    if (seen_names.find(itr->name) != seen_names.end())
      continue;
    result = result && AddFormFieldValueTime(*itr, changes, time);
    seen_names.insert(itr->name);
  }
  return result;
}

bool AutofillTable::GetAllAutofillEntries(std::vector<AutofillEntry>* entries) {
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT name, value, date_created, date_last_used FROM autofill"));

  while (s.Step()) {
    base::string16 name = s.ColumnString16(0);
    base::string16 value = s.ColumnString16(1);
    Time date_created = Time::FromTimeT(s.ColumnInt64(2));
    Time date_last_used = Time::FromTimeT(s.ColumnInt64(3));
    entries->push_back(
        AutofillEntry(AutofillKey(name, value), date_created, date_last_used));
  }

  return s.Succeeded();
}

bool AutofillTable::GetAutofillTimestamps(const base::string16& name,
                                          const base::string16& value,
                                          Time* date_created,
                                          Time* date_last_used) {
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT date_created, date_last_used FROM autofill "
      "WHERE name = ? AND value = ?"));
  s.BindString16(0, name);
  s.BindString16(1, value);
  if (!s.Step())
    return false;

  *date_created = Time::FromTimeT(s.ColumnInt64(0));
  *date_last_used = Time::FromTimeT(s.ColumnInt64(1));

  DCHECK(!s.Step());
  return true;
}

bool AutofillTable::UpdateAutofillEntries(
    const std::vector<AutofillEntry>& entries) {
  if (!entries.size())
    return true;

  // Remove all existing entries.
  for (size_t i = 0; i < entries.size(); ++i) {
    sql::Statement s(db_->GetUniqueStatement(
        "DELETE FROM autofill WHERE name = ? AND value = ?"));
    s.BindString16(0, entries[i].key().name());
    s.BindString16(1, entries[i].key().value());
    if (!s.Run())
      return false;
  }

  // Insert all the supplied autofill entries.
  for (size_t i = 0; i < entries.size(); ++i) {
    if (!InsertAutofillEntry(entries[i]))
      return false;
  }

  return true;
}

bool AutofillTable::InsertAutofillEntry(const AutofillEntry& entry) {
  std::string sql =
      "INSERT INTO autofill "
      "(name, value, value_lower, date_created, date_last_used, count) "
      "VALUES (?, ?, ?, ?, ?, ?)";
  sql::Statement s(db_->GetUniqueStatement(sql.c_str()));
  s.BindString16(0, entry.key().name());
  s.BindString16(1, entry.key().value());
  s.BindString16(2, base::i18n::ToLower(entry.key().value()));
  s.BindInt64(3, entry.date_created().ToTimeT());
  s.BindInt64(4, entry.date_last_used().ToTimeT());
  // TODO(isherman): The counts column is currently synced implicitly as the
  // number of timestamps.  Sync the value explicitly instead, since the DB now
  // only saves the first and last timestamp, which makes counting timestamps
  // completely meaningless as a way to track frequency of usage.
  s.BindInt(5, entry.date_last_used() == entry.date_created() ? 1 : 2);
  return s.Run();
}

bool AutofillTable::AddFormFieldValueTime(const FormFieldData& element,
                                          std::vector<AutofillChange>* changes,
                                          Time time) {
  sql::Statement s_exists(db_->GetUniqueStatement(
      "SELECT COUNT(*) FROM autofill WHERE name = ? AND value = ?"));
  s_exists.BindString16(0, element.name);
  s_exists.BindString16(1, element.value);
  if (!s_exists.Step())
    return false;

  bool already_exists = s_exists.ColumnInt(0) > 0;
  if (already_exists) {
    sql::Statement s(db_->GetUniqueStatement(
        "UPDATE autofill SET date_last_used = ?, count = count + 1 "
        "WHERE name = ? AND value = ?"));
    s.BindInt64(0, time.ToTimeT());
    s.BindString16(1, element.name);
    s.BindString16(2, element.value);
    if (!s.Run())
      return false;
  } else {
    time_t time_as_time_t = time.ToTimeT();
    sql::Statement s(db_->GetUniqueStatement(
        "INSERT INTO autofill "
        "(name, value, value_lower, date_created, date_last_used, count) "
        "VALUES (?, ?, ?, ?, ?, ?)"));
    s.BindString16(0, element.name);
    s.BindString16(1, element.value);
    s.BindString16(2, base::i18n::ToLower(element.value));
    s.BindInt64(3, time_as_time_t);
    s.BindInt64(4, time_as_time_t);
    s.BindInt(5, 1);
    if (!s.Run())
      return false;
  }

  AutofillChange::Type change_type =
      already_exists ? AutofillChange::UPDATE : AutofillChange::ADD;
  changes->push_back(
      AutofillChange(change_type, AutofillKey(element.name, element.value)));
  return true;
}


bool AutofillTable::RemoveFormElement(const base::string16& name,
                                      const base::string16& value) {
  sql::Statement s(db_->GetUniqueStatement(
      "DELETE FROM autofill WHERE name = ? AND value= ?"));
  s.BindString16(0, name);
  s.BindString16(1, value);
  return s.Run();
}

bool AutofillTable::AddAutofillProfile(const AutofillProfile& profile) {
  if (IsAutofillGUIDInTrash(profile.guid()))
    return true;

  sql::Statement s(db_->GetUniqueStatement(
      "INSERT INTO autofill_profiles"
      "(guid, company_name, street_address, dependent_locality, city, state,"
      " zipcode, sorting_code, country_code, date_modified, origin,"
      " language_code)"
      "VALUES (?,?,?,?,?,?,?,?,?,?,?,?)"));
  BindAutofillProfileToStatement(profile, &s);

  if (!s.Run())
    return false;

  return AddAutofillProfilePieces(profile, db_);
}

bool AutofillTable::GetAutofillProfile(const std::string& guid,
                                       AutofillProfile** profile) {
  DCHECK(base::IsValidGUID(guid));
  DCHECK(profile);
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid, company_name, street_address, dependent_locality, city,"
      " state, zipcode, sorting_code, country_code, date_modified, origin,"
      " language_code "
      "FROM autofill_profiles "
      "WHERE guid=?"));
  s.BindString(0, guid);

  if (!s.Step())
    return false;

  scoped_ptr<AutofillProfile> p = AutofillProfileFromStatement(s);

  // Get associated name info.
  AddAutofillProfileNamesToProfile(db_, p.get());

  // Get associated email info.
  AddAutofillProfileEmailsToProfile(db_, p.get());

  // Get associated phone info.
  AddAutofillProfilePhonesToProfile(db_, p.get());

  *profile = p.release();
  return true;
}

bool AutofillTable::GetAutofillProfiles(
    std::vector<AutofillProfile*>* profiles) {
  DCHECK(profiles);
  profiles->clear();

  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid "
      "FROM autofill_profiles"));

  while (s.Step()) {
    std::string guid = s.ColumnString(0);
    AutofillProfile* profile = NULL;
    if (!GetAutofillProfile(guid, &profile))
      return false;
    profiles->push_back(profile);
  }

  return s.Succeeded();
}

bool AutofillTable::UpdateAutofillProfile(const AutofillProfile& profile) {
  DCHECK(base::IsValidGUID(profile.guid()));

  // Don't update anything until the trash has been emptied.  There may be
  // pending modifications to process.
  if (!IsAutofillProfilesTrashEmpty())
    return true;

  AutofillProfile* tmp_profile = NULL;
  if (!GetAutofillProfile(profile.guid(), &tmp_profile))
    return false;

  // Preserve appropriate modification dates by not updating unchanged profiles.
  scoped_ptr<AutofillProfile> old_profile(tmp_profile);
  if (*old_profile == profile)
    return true;

  sql::Statement s(db_->GetUniqueStatement(
      "UPDATE autofill_profiles "
      "SET guid=?, company_name=?, street_address=?, dependent_locality=?, "
      "    city=?, state=?, zipcode=?, sorting_code=?, country_code=?, "
      "    date_modified=?, origin=?, language_code=? "
      "WHERE guid=?"));
  BindAutofillProfileToStatement(profile, &s);
  s.BindString(12, profile.guid());

  bool result = s.Run();
  DCHECK_GT(db_->GetLastChangeCount(), 0);
  if (!result)
    return result;

  // Remove the old names, emails, and phone numbers.
  if (!RemoveAutofillProfilePieces(profile.guid(), db_))
    return false;

  return AddAutofillProfilePieces(profile, db_);
}

bool AutofillTable::RemoveAutofillProfile(const std::string& guid) {
  DCHECK(base::IsValidGUID(guid));

  if (IsAutofillGUIDInTrash(guid)) {
    sql::Statement s_trash(db_->GetUniqueStatement(
        "DELETE FROM autofill_profiles_trash WHERE guid = ?"));
    s_trash.BindString(0, guid);

    bool success = s_trash.Run();
    DCHECK_GT(db_->GetLastChangeCount(), 0) << "Expected item in trash";
    return success;
  }

  sql::Statement s(db_->GetUniqueStatement(
      "DELETE FROM autofill_profiles WHERE guid = ?"));
  s.BindString(0, guid);

  if (!s.Run())
    return false;

  return RemoveAutofillProfilePieces(guid, db_);
}

bool AutofillTable::ClearAutofillProfiles() {
  sql::Statement s1(db_->GetUniqueStatement(
      "DELETE FROM autofill_profiles"));

  if (!s1.Run())
    return false;

  sql::Statement s2(db_->GetUniqueStatement(
      "DELETE FROM autofill_profile_names"));

  if (!s2.Run())
    return false;

  sql::Statement s3(db_->GetUniqueStatement(
      "DELETE FROM autofill_profile_emails"));

  if (!s3.Run())
    return false;

  sql::Statement s4(db_->GetUniqueStatement(
      "DELETE FROM autofill_profile_phones"));

  return s4.Run();
}

bool AutofillTable::AddCreditCard(const CreditCard& credit_card) {
  sql::Statement s(db_->GetUniqueStatement(
      "INSERT INTO credit_cards"
      "(guid, name_on_card, expiration_month, expiration_year, "
      " card_number_encrypted, date_modified, origin)"
      "VALUES (?,?,?,?,?,?,?)"));
  BindCreditCardToStatement(credit_card, &s);

  if (!s.Run())
    return false;

  DCHECK_GT(db_->GetLastChangeCount(), 0);
  return true;
}

bool AutofillTable::GetCreditCard(const std::string& guid,
                                  CreditCard** credit_card) {
  DCHECK(base::IsValidGUID(guid));
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid, name_on_card, expiration_month, expiration_year, "
      "       card_number_encrypted, date_modified, origin "
      "FROM credit_cards "
      "WHERE guid = ?"));
  s.BindString(0, guid);

  if (!s.Step())
    return false;

  *credit_card = CreditCardFromStatement(s).release();
  return true;
}

bool AutofillTable::GetCreditCards(
    std::vector<CreditCard*>* credit_cards) {
  DCHECK(credit_cards);
  credit_cards->clear();

  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid "
      "FROM credit_cards"));

  while (s.Step()) {
    std::string guid = s.ColumnString(0);
    CreditCard* credit_card = NULL;
    if (!GetCreditCard(guid, &credit_card))
      return false;
    credit_cards->push_back(credit_card);
  }

  return s.Succeeded();
}

bool AutofillTable::UpdateCreditCard(const CreditCard& credit_card) {
  DCHECK(base::IsValidGUID(credit_card.guid()));

  CreditCard* tmp_credit_card = NULL;
  if (!GetCreditCard(credit_card.guid(), &tmp_credit_card))
    return false;

  // Preserve appropriate modification dates by not updating unchanged cards.
  scoped_ptr<CreditCard> old_credit_card(tmp_credit_card);
  if (*old_credit_card == credit_card)
    return true;

  sql::Statement s(db_->GetUniqueStatement(
      "UPDATE credit_cards "
      "SET guid=?, name_on_card=?, expiration_month=?, "
      "    expiration_year=?, card_number_encrypted=?, date_modified=?, "
      "    origin=? "
      "WHERE guid=?"));
  BindCreditCardToStatement(credit_card, &s);
  s.BindString(7, credit_card.guid());

  bool result = s.Run();
  DCHECK_GT(db_->GetLastChangeCount(), 0);
  return result;
}

bool AutofillTable::RemoveCreditCard(const std::string& guid) {
  DCHECK(base::IsValidGUID(guid));
  sql::Statement s(db_->GetUniqueStatement(
      "DELETE FROM credit_cards WHERE guid = ?"));
  s.BindString(0, guid);

  return s.Run();
}

bool AutofillTable::RemoveAutofillDataModifiedBetween(
    const Time& delete_begin,
    const Time& delete_end,
    std::vector<std::string>* profile_guids,
    std::vector<std::string>* credit_card_guids) {
  DCHECK(delete_end.is_null() || delete_begin < delete_end);

  time_t delete_begin_t = delete_begin.ToTimeT();
  time_t delete_end_t = GetEndTime(delete_end);

  // Remember Autofill profiles in the time range.
  sql::Statement s_profiles_get(db_->GetUniqueStatement(
      "SELECT guid FROM autofill_profiles "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_profiles_get.BindInt64(0, delete_begin_t);
  s_profiles_get.BindInt64(1, delete_end_t);

  profile_guids->clear();
  while (s_profiles_get.Step()) {
    std::string guid = s_profiles_get.ColumnString(0);
    profile_guids->push_back(guid);
  }
  if (!s_profiles_get.Succeeded())
    return false;

  // Remove Autofill profiles in the time range.
  sql::Statement s_profiles(db_->GetUniqueStatement(
      "DELETE FROM autofill_profiles "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_profiles.BindInt64(0, delete_begin_t);
  s_profiles.BindInt64(1, delete_end_t);

  if (!s_profiles.Run())
    return false;

  // Remember Autofill credit cards in the time range.
  sql::Statement s_credit_cards_get(db_->GetUniqueStatement(
      "SELECT guid FROM credit_cards "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_credit_cards_get.BindInt64(0, delete_begin_t);
  s_credit_cards_get.BindInt64(1, delete_end_t);

  credit_card_guids->clear();
  while (s_credit_cards_get.Step()) {
    std::string guid = s_credit_cards_get.ColumnString(0);
    credit_card_guids->push_back(guid);
  }
  if (!s_credit_cards_get.Succeeded())
    return false;

  // Remove Autofill credit cards in the time range.
  sql::Statement s_credit_cards(db_->GetUniqueStatement(
      "DELETE FROM credit_cards "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_credit_cards.BindInt64(0, delete_begin_t);
  s_credit_cards.BindInt64(1, delete_end_t);

  return s_credit_cards.Run();
}

bool AutofillTable::RemoveOriginURLsModifiedBetween(
    const Time& delete_begin,
    const Time& delete_end,
    ScopedVector<AutofillProfile>* profiles) {
  DCHECK(delete_end.is_null() || delete_begin < delete_end);

  time_t delete_begin_t = delete_begin.ToTimeT();
  time_t delete_end_t = GetEndTime(delete_end);

  // Remember Autofill profiles with URL origins in the time range.
  sql::Statement s_profiles_get(db_->GetUniqueStatement(
      "SELECT guid, origin FROM autofill_profiles "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_profiles_get.BindInt64(0, delete_begin_t);
  s_profiles_get.BindInt64(1, delete_end_t);

  std::vector<std::string> profile_guids;
  while (s_profiles_get.Step()) {
    std::string guid = s_profiles_get.ColumnString(0);
    std::string origin = s_profiles_get.ColumnString(1);
    if (GURL(origin).is_valid())
      profile_guids.push_back(guid);
  }
  if (!s_profiles_get.Succeeded())
    return false;

  // Clear out the origins for the found Autofill profiles.
  for (std::vector<std::string>::const_iterator it = profile_guids.begin();
       it != profile_guids.end(); ++it) {
    sql::Statement s_profile(db_->GetUniqueStatement(
        "UPDATE autofill_profiles SET origin='' WHERE guid=?"));
    s_profile.BindString(0, *it);
    if (!s_profile.Run())
      return false;

    AutofillProfile* profile;
    if (!GetAutofillProfile(*it, &profile))
      return false;

    profiles->push_back(profile);
  }

  // Remember Autofill credit cards with URL origins in the time range.
  sql::Statement s_credit_cards_get(db_->GetUniqueStatement(
      "SELECT guid, origin FROM credit_cards "
      "WHERE date_modified >= ? AND date_modified < ?"));
  s_credit_cards_get.BindInt64(0, delete_begin_t);
  s_credit_cards_get.BindInt64(1, delete_end_t);

  std::vector<std::string> credit_card_guids;
  while (s_credit_cards_get.Step()) {
    std::string guid = s_credit_cards_get.ColumnString(0);
    std::string origin = s_credit_cards_get.ColumnString(1);
    if (GURL(origin).is_valid())
      credit_card_guids.push_back(guid);
  }
  if (!s_credit_cards_get.Succeeded())
    return false;

  // Clear out the origins for the found credit cards.
  for (std::vector<std::string>::const_iterator it = credit_card_guids.begin();
       it != credit_card_guids.end(); ++it) {
    sql::Statement s_credit_card(db_->GetUniqueStatement(
        "UPDATE credit_cards SET origin='' WHERE guid=?"));
    s_credit_card.BindString(0, *it);
    if (!s_credit_card.Run())
      return false;
  }

  return true;
}

bool AutofillTable::GetAutofillProfilesInTrash(
    std::vector<std::string>* guids) {
  guids->clear();

  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid "
      "FROM autofill_profiles_trash"));

  while (s.Step()) {
    std::string guid = s.ColumnString(0);
    guids->push_back(guid);
  }

  return s.Succeeded();
}

bool AutofillTable::EmptyAutofillProfilesTrash() {
  sql::Statement s(db_->GetUniqueStatement(
      "DELETE FROM autofill_profiles_trash"));

  return s.Run();
}


bool AutofillTable::AddAutofillGUIDToTrash(const std::string& guid) {
  sql::Statement s(db_->GetUniqueStatement(
    "INSERT INTO autofill_profiles_trash"
    " (guid) "
    "VALUES (?)"));
  s.BindString(0, guid);

  return s.Run();
}

bool AutofillTable::IsAutofillProfilesTrashEmpty() {
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid "
      "FROM autofill_profiles_trash"));

  return !s.Step();
}

bool AutofillTable::IsAutofillGUIDInTrash(const std::string& guid) {
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid "
      "FROM autofill_profiles_trash "
      "WHERE guid = ?"));
  s.BindString(0, guid);

  return s.Step();
}

bool AutofillTable::InitMainTable() {
  if (!db_->DoesTableExist("autofill")) {
    if (!db_->Execute("CREATE TABLE autofill ("
                      "name VARCHAR, "
                      "value VARCHAR, "
                      "value_lower VARCHAR, "
                      "date_created INTEGER DEFAULT 0, "
                      "date_last_used INTEGER DEFAULT 0, "
                      "count INTEGER DEFAULT 1, "
                      "PRIMARY KEY (name, value))") ||
        !db_->Execute("CREATE INDEX autofill_name ON autofill (name)") ||
        !db_->Execute("CREATE INDEX autofill_name_value_lower ON "
                      "autofill (name, value_lower)")) {
       NOTREACHED();
       return false;
    }
  }
  return true;
}

bool AutofillTable::InitCreditCardsTable() {
  if (!db_->DoesTableExist("credit_cards")) {
    if (!db_->Execute("CREATE TABLE credit_cards ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "name_on_card VARCHAR, "
                      "expiration_month INTEGER, "
                      "expiration_year INTEGER, "
                      "card_number_encrypted BLOB, "
                      "date_modified INTEGER NOT NULL DEFAULT 0, "
                      "origin VARCHAR DEFAULT '')")) {
      NOTREACHED();
      return false;
    }
  }

  return true;
}

bool AutofillTable::InitProfilesTable() {
  if (!db_->DoesTableExist("autofill_profiles")) {
    if (!db_->Execute("CREATE TABLE autofill_profiles ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "company_name VARCHAR, "
                      "street_address VARCHAR, "
                      "dependent_locality VARCHAR, "
                      "city VARCHAR, "
                      "state VARCHAR, "
                      "zipcode VARCHAR, "
                      "sorting_code VARCHAR, "
                      "country_code VARCHAR, "
                      "date_modified INTEGER NOT NULL DEFAULT 0, "
                      "origin VARCHAR DEFAULT '', "
                      "language_code VARCHAR)")) {
      NOTREACHED();
      return false;
    }
  }
  return true;
}

bool AutofillTable::InitProfileNamesTable() {
  if (!db_->DoesTableExist("autofill_profile_names")) {
    if (!db_->Execute("CREATE TABLE autofill_profile_names ( "
                      "guid VARCHAR, "
                      "first_name VARCHAR, "
                      "middle_name VARCHAR, "
                      "last_name VARCHAR, "
                      "full_name VARCHAR)")) {
      NOTREACHED();
      return false;
    }
  }
  return true;
}

bool AutofillTable::InitProfileEmailsTable() {
  if (!db_->DoesTableExist("autofill_profile_emails")) {
    if (!db_->Execute("CREATE TABLE autofill_profile_emails ( "
                      "guid VARCHAR, "
                      "email VARCHAR)")) {
      NOTREACHED();
      return false;
    }
  }
  return true;
}

bool AutofillTable::InitProfilePhonesTable() {
  if (!db_->DoesTableExist("autofill_profile_phones")) {
    if (!db_->Execute("CREATE TABLE autofill_profile_phones ( "
                      "guid VARCHAR, "
                      "number VARCHAR)")) {
      NOTREACHED();
      return false;
    }
  }
  return true;
}

bool AutofillTable::InitProfileTrashTable() {
  if (!db_->DoesTableExist("autofill_profiles_trash")) {
    if (!db_->Execute("CREATE TABLE autofill_profiles_trash ( "
                      "guid VARCHAR)")) {
      NOTREACHED();
      return false;
    }
  }
  return true;
}

bool AutofillTable::MigrateToVersion22ClearAutofillEmptyValueElements() {
  if (!db_->DoesTableExist("autofill") &&
      (!db_->Execute("CREATE TABLE autofill ("
                     "  name VARCHAR,"
                     "  value VARCHAR,"
                     "  value_lower VARCHAR,"
                     "  pair_id INTEGER PRIMARY KEY,"
                     "  count INTEGER DEFAULT 1)") ||
       !db_->Execute("CREATE INDEX autofill_name ON autofill (name)") ||
       !db_->Execute("CREATE INDEX autofill_name_value_lower ON"
                     "  autofill (name, value_lower)") ||
       !db_->Execute("CREATE TABLE autofill_dates ("
                     "  pair_id INTEGER DEFAULT 0,"
                     "  date_created INTEGER DEFAULT 0)") ||
       !db_->Execute("CREATE INDEX autofill_dates_pair_id ON"
                     "  autofill (pair_id)")))
    return false;


  sql::Statement s(db_->GetUniqueStatement(
      "SELECT pair_id FROM autofill WHERE TRIM(value) = \"\""));
  if (!s.is_valid())
    return false;

  std::set<int64> ids;
  while (s.Step())
    ids.insert(s.ColumnInt64(0));
  if (!s.Succeeded())
    return false;

  if (!db_->Execute("DELETE FROM autofill WHERE TRIM(value) = \"\""))
    return false;

  for (std::set<int64>::const_iterator it = ids.begin(); it != ids.end();
       ++it) {
    sql::Statement s(db_->GetUniqueStatement(
        "DELETE FROM autofill_dates WHERE pair_id = ?"));
    s.BindInt64(0, *it);
    if (!s.Run())
      return false;
  }

  return true;
}

// Add the card_number_encrypted column if credit card table was not
// created in this build (otherwise the column already exists).
// WARNING: Do not change the order of the execution of the SQL
// statements in this case!  Profile corruption and data migration
// issues WILL OCCUR. See http://crbug.com/10913
//
// The problem is that if a user has a profile which was created before
// r37036, when the credit_cards table was added, and then failed to
// update this profile between the credit card addition and the addition
// of the "encrypted" columns (44963), the next data migration will put
// the user's profile in an incoherent state: The user will update from
// a data profile set to be earlier than 22, and therefore pass through
// this update case.  But because the user did not have a credit_cards
// table before starting Chrome, it will have just been initialized
// above, and so already have these columns -- and thus this data
// update step will have failed.
//
// The false assumption in this case is that at this step in the
// migration, the user has a credit card table, and that this
// table does not include encrypted columns!
// Because this case does not roll back the complete set of SQL
// transactions properly in case of failure (that is, it does not
// roll back the table initialization done above), the incoherent
// profile will now see itself as being at version 22 -- but include a
// fully initialized credit_cards table.  Every time Chrome runs, it
// will try to update the web database and fail at this step, unless
// we allow for the faulty assumption described above by checking for
// the existence of the columns only AFTER we've executed the commands
// to add them.
bool AutofillTable::MigrateToVersion23AddCardNumberEncryptedColumn() {
  if (!db_->DoesTableExist("autofill_profiles") &&
      (!db_->Execute("CREATE TABLE autofill_profiles ( "
                     "label VARCHAR, "
                     "unique_id INTEGER PRIMARY KEY, "
                     "first_name VARCHAR, "
                     "middle_name VARCHAR, "
                     "last_name VARCHAR, "
                     "email VARCHAR, "
                     "company_name VARCHAR, "
                     "address_line_1 VARCHAR, "
                     "address_line_2 VARCHAR, "
                     "city VARCHAR, "
                     "state VARCHAR, "
                     "zipcode VARCHAR, "
                     "country VARCHAR, "
                     "phone VARCHAR, "
                     "fax VARCHAR)") ||
       !db_->Execute("CREATE INDEX autofill_profiles_label_index"
                     "  ON autofill_profiles (label)")))
    return false;

  if (!db_->DoesTableExist("credit_cards") &&
      (!db_->Execute("CREATE TABLE credit_cards ( "
                     "label VARCHAR, "
                     "unique_id INTEGER PRIMARY KEY, "
                     "name_on_card VARCHAR, "
                     "type VARCHAR, "
                     "card_number VARCHAR, "
                     "expiration_month INTEGER, "
                     "expiration_year INTEGER, "
                     "verification_code VARCHAR, "
                     "billing_address VARCHAR, "
                     "shipping_address VARCHAR)") ||
       !db_->Execute("CREATE INDEX credit_cards_label_index"
                     "  ON credit_cards (label)")))
    return false;

  if (!db_->DoesColumnExist("credit_cards", "card_number_encrypted")) {
    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
                      "card_number_encrypted BLOB DEFAULT NULL")) {
      return false;
    }
  }

  if (!db_->DoesColumnExist("credit_cards", "verification_code_encrypted")) {
    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
                      "verification_code_encrypted BLOB DEFAULT NULL")) {
      return false;
    }
  }

  return true;
}

// One-time cleanup for http://crbug.com/38364 - In the presence of
// multi-byte UTF-8 characters, that bug could cause Autofill strings
// to grow larger and more corrupt with each save.  The cleanup removes
// any row with a string field larger than a reasonable size.  The string
// fields examined here are precisely the ones that were subject to
// corruption by the original bug.
bool AutofillTable::MigrateToVersion24CleanupOversizedStringFields() {
  const std::string autofill_is_too_big =
      "max(length(name), length(value)) > 500";

  const std::string credit_cards_is_too_big =
      "max(length(label), length(name_on_card), length(type), "
      "    length(expiration_month), length(expiration_year), "
      "    length(billing_address), length(shipping_address) "
      ") > 500";

  const std::string autofill_profiles_is_too_big =
      "max(length(label), length(first_name), "
      "    length(middle_name), length(last_name), length(email), "
      "    length(company_name), length(address_line_1), "
      "    length(address_line_2), length(city), length(state), "
      "    length(zipcode), length(country), length(phone)) > 500";

  std::string query = "DELETE FROM autofill_dates WHERE pair_id IN ("
      "SELECT pair_id FROM autofill WHERE " + autofill_is_too_big + ")";

  if (!db_->Execute(query.c_str()))
    return false;

  query = "DELETE FROM autofill WHERE " + autofill_is_too_big;

  if (!db_->Execute(query.c_str()))
    return false;

  // Only delete from legacy credit card tables where specific columns exist.
  if (db_->DoesColumnExist("credit_cards", "label") &&
      db_->DoesColumnExist("credit_cards", "name_on_card") &&
      db_->DoesColumnExist("credit_cards", "type") &&
      db_->DoesColumnExist("credit_cards", "expiration_month") &&
      db_->DoesColumnExist("credit_cards", "expiration_year") &&
      db_->DoesColumnExist("credit_cards", "billing_address") &&
      db_->DoesColumnExist("credit_cards", "shipping_address") &&
      db_->DoesColumnExist("autofill_profiles", "label")) {
    query = "DELETE FROM credit_cards WHERE (" + credit_cards_is_too_big +
        ") OR label IN (SELECT label FROM autofill_profiles WHERE " +
        autofill_profiles_is_too_big + ")";

    if (!db_->Execute(query.c_str()))
      return false;
  }

  if (db_->DoesColumnExist("autofill_profiles", "label")) {
    query = "DELETE FROM autofill_profiles WHERE " +
        autofill_profiles_is_too_big;

    if (!db_->Execute(query.c_str()))
      return false;
  }

  return true;
}

// Change the credit_cards.billing_address column from a string to an
// int.  The stored string is the label of an address, so we have to
// select the unique ID of this address using the label as a foreign
// key into the |autofill_profiles| table.
bool AutofillTable::MigrateToVersion27UpdateLegacyCreditCards() {
  // Only migrate from legacy credit card tables where specific columns
  // exist.
  if (!(db_->DoesColumnExist("credit_cards", "unique_id") &&
        db_->DoesColumnExist("credit_cards", "billing_address") &&
        db_->DoesColumnExist("autofill_profiles", "unique_id"))) {
    return true;
  }

  std::string stmt =
      "SELECT credit_cards.unique_id, autofill_profiles.unique_id "
      "FROM autofill_profiles, credit_cards "
      "WHERE credit_cards.billing_address = autofill_profiles.label";
  sql::Statement s(db_->GetUniqueStatement(stmt.c_str()));

  std::map<int, int> cc_billing_map;
  while (s.Step())
    cc_billing_map[s.ColumnInt(0)] = s.ColumnInt(1);
  if (!s.Succeeded())
    return false;

  // Windows already stores the IDs as strings in |billing_address|. Try
  // to convert those.
  if (cc_billing_map.empty()) {
    std::string stmt = "SELECT unique_id,billing_address FROM credit_cards";
    sql::Statement s(db_->GetUniqueStatement(stmt.c_str()));

    while (s.Step()) {
      int id = 0;
      if (base::StringToInt(s.ColumnString(1), &id))
        cc_billing_map[s.ColumnInt(0)] = id;
    }
    if (!s.Succeeded())
      return false;
  }

  if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
                    "label VARCHAR, "
                    "unique_id INTEGER PRIMARY KEY, "
                    "name_on_card VARCHAR, "
                    "type VARCHAR, "
                    "card_number VARCHAR, "
                    "expiration_month INTEGER, "
                    "expiration_year INTEGER, "
                    "verification_code VARCHAR, "
                    "billing_address INTEGER, "
                    "shipping_address VARCHAR, "
                    "card_number_encrypted BLOB, "
                    "verification_code_encrypted BLOB)")) {
    return false;
  }

  if (!db_->Execute(
      "INSERT INTO credit_cards_temp "
      "SELECT label,unique_id,name_on_card,type,card_number,"
      "expiration_month,expiration_year,verification_code,0,"
      "shipping_address,card_number_encrypted,"
      "verification_code_encrypted FROM credit_cards")) {
    return false;
  }

  if (!db_->Execute("DROP TABLE credit_cards"))
    return false;

  if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
    return false;

  for (std::map<int, int>::const_iterator iter = cc_billing_map.begin();
       iter != cc_billing_map.end(); ++iter) {
    sql::Statement s(db_->GetCachedStatement(
        SQL_FROM_HERE,
        "UPDATE credit_cards SET billing_address=? WHERE unique_id=?"));
    s.BindInt(0, (*iter).second);
    s.BindInt(1, (*iter).first);

    if (!s.Run())
      return false;
  }

  return true;
}

bool AutofillTable::MigrateToVersion30AddDateModifed() {
  // Add date_modified to autofill_profiles.
  if (!db_->DoesColumnExist("autofill_profiles", "date_modified")) {
    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
                      "date_modified INTEGER NON NULL DEFAULT 0")) {
      return false;
    }

    sql::Statement s(db_->GetUniqueStatement(
        "UPDATE autofill_profiles SET date_modified=?"));
    s.BindInt64(0, Time::Now().ToTimeT());

    if (!s.Run())
      return false;
  }

  // Add date_modified to credit_cards.
  if (!db_->DoesColumnExist("credit_cards", "date_modified")) {
    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
                      "date_modified INTEGER NON NULL DEFAULT 0")) {
      return false;
    }

    sql::Statement s(db_->GetUniqueStatement(
        "UPDATE credit_cards SET date_modified=?"));
    s.BindInt64(0, Time::Now().ToTimeT());

    if (!s.Run())
      return false;
  }

  return true;
}

bool AutofillTable::MigrateToVersion31AddGUIDToCreditCardsAndProfiles() {
  // Note that we need to check for the guid column's existence due to the
  // fact that for a version 22 database the |autofill_profiles| table
  // gets created fresh with |InitAutofillProfilesTable|.
  if (!db_->DoesColumnExist("autofill_profiles", "guid")) {
    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
                      "guid VARCHAR NOT NULL DEFAULT \"\"")) {
      return false;
    }

    // Set all the |guid| fields to valid values.

    sql::Statement s(db_->GetUniqueStatement("SELECT unique_id "
                                             "FROM autofill_profiles"));

    while (s.Step()) {
      sql::Statement update_s(
          db_->GetUniqueStatement("UPDATE autofill_profiles "
                                  "SET guid=? WHERE unique_id=?"));
      update_s.BindString(0, base::GenerateGUID());
      update_s.BindInt(1, s.ColumnInt(0));

      if (!update_s.Run())
        return false;
    }
    if (!s.Succeeded())
      return false;
  }

  // Note that we need to check for the guid column's existence due to the
  // fact that for a version 22 database the |autofill_profiles| table
  // gets created fresh with |InitAutofillProfilesTable|.
  if (!db_->DoesColumnExist("credit_cards", "guid")) {
    if (!db_->Execute("ALTER TABLE credit_cards ADD COLUMN "
                      "guid VARCHAR NOT NULL DEFAULT \"\"")) {
      return false;
    }

    // Set all the |guid| fields to valid values.

    sql::Statement s(db_->GetUniqueStatement("SELECT unique_id "
                                             "FROM credit_cards"));

    while (s.Step()) {
      sql::Statement update_s(
          db_->GetUniqueStatement("UPDATE credit_cards "
                                  "set guid=? WHERE unique_id=?"));
      update_s.BindString(0, base::GenerateGUID());
      update_s.BindInt(1, s.ColumnInt(0));

      if (!update_s.Run())
        return false;
    }
    if (!s.Succeeded())
      return false;
  }

  return true;
}

bool AutofillTable::MigrateToVersion32UpdateProfilesAndCreditCards() {
  if (db_->DoesColumnExist("autofill_profiles", "unique_id")) {
    if (!db_->Execute("CREATE TABLE autofill_profiles_temp ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "label VARCHAR, "
                      "first_name VARCHAR, "
                      "middle_name VARCHAR, "
                      "last_name VARCHAR, "
                      "email VARCHAR, "
                      "company_name VARCHAR, "
                      "address_line_1 VARCHAR, "
                      "address_line_2 VARCHAR, "
                      "city VARCHAR, "
                      "state VARCHAR, "
                      "zipcode VARCHAR, "
                      "country VARCHAR, "
                      "phone VARCHAR, "
                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
      return false;
    }

    if (!db_->Execute(
        "INSERT INTO autofill_profiles_temp "
        "SELECT guid, label, first_name, middle_name, last_name, email, "
        "company_name, address_line_1, address_line_2, city, state, "
        "zipcode, country, phone, date_modified "
        "FROM autofill_profiles")) {
      return false;
    }

    if (!db_->Execute("DROP TABLE autofill_profiles"))
      return false;

    if (!db_->Execute(
        "ALTER TABLE autofill_profiles_temp RENAME TO autofill_profiles")) {
      return false;
    }
  }

  if (db_->DoesColumnExist("credit_cards", "unique_id")) {
    if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "label VARCHAR, "
                      "name_on_card VARCHAR, "
                      "expiration_month INTEGER, "
                      "expiration_year INTEGER, "
                      "card_number_encrypted BLOB, "
                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
      return false;
    }

    if (!db_->Execute(
        "INSERT INTO credit_cards_temp "
        "SELECT guid, label, name_on_card, expiration_month, "
        "expiration_year, card_number_encrypted, date_modified "
        "FROM credit_cards")) {
      return false;
    }

    if (!db_->Execute("DROP TABLE credit_cards"))
      return false;

    if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
      return false;
  }

  return true;
}

// Test the existence of the |first_name| column as an indication that
// we need a migration.  It is possible that the new |autofill_profiles|
// schema is in place because the table was newly created when migrating
// from a pre-version-22 database.
bool AutofillTable::MigrateToVersion33ProfilesBasedOnFirstName() {
  if (!db_->DoesTableExist("autofill_profile_names") &&
      !db_->Execute("CREATE TABLE autofill_profile_names ( "
                    "guid VARCHAR, "
                    "first_name VARCHAR, "
                    "middle_name VARCHAR, "
                    "last_name VARCHAR)"))
    return false;

  if (!db_->DoesTableExist("autofill_profile_emails") &&
      !db_->Execute("CREATE TABLE autofill_profile_emails ( "
                    "guid VARCHAR, "
                    "email VARCHAR)"))
    return false;

  if (!db_->DoesTableExist("autofill_profile_phones") &&
      !db_->Execute("CREATE TABLE autofill_profile_phones ( "
                    "guid VARCHAR, "
                    "type INTEGER DEFAULT 0, "
                    "number VARCHAR)"))
    return false;

  if (db_->DoesColumnExist("autofill_profiles", "first_name")) {
    // Create autofill_profiles_temp table that will receive the data.
    if (!db_->DoesTableExist("autofill_profiles_temp")) {
      if (!db_->Execute("CREATE TABLE autofill_profiles_temp ( "
                        "guid VARCHAR PRIMARY KEY, "
                        "company_name VARCHAR, "
                        "address_line_1 VARCHAR, "
                        "address_line_2 VARCHAR, "
                        "city VARCHAR, "
                        "state VARCHAR, "
                        "zipcode VARCHAR, "
                        "country VARCHAR, "
                        "date_modified INTEGER NOT NULL DEFAULT 0)")) {
        return false;
      }
    }

    sql::Statement s(db_->GetUniqueStatement(
        "SELECT guid, first_name, middle_name, last_name, email, "
        "company_name, address_line_1, address_line_2, city, state, "
        "zipcode, country, phone, date_modified "
        "FROM autofill_profiles"));

    while (s.Step()) {
      AutofillProfile profile;
      int index = 0;
      profile.set_guid(s.ColumnString(index++));
      DCHECK(base::IsValidGUID(profile.guid()));

      profile.SetRawInfo(NAME_FIRST, s.ColumnString16(index++));
      profile.SetRawInfo(NAME_MIDDLE, s.ColumnString16(index++));
      profile.SetRawInfo(NAME_LAST, s.ColumnString16(index++));
      profile.SetRawInfo(EMAIL_ADDRESS, s.ColumnString16(index++));
      profile.SetRawInfo(COMPANY_NAME, s.ColumnString16(index++));
      profile.SetRawInfo(ADDRESS_HOME_LINE1, s.ColumnString16(index++));
      profile.SetRawInfo(ADDRESS_HOME_LINE2, s.ColumnString16(index++));
      profile.SetRawInfo(ADDRESS_HOME_CITY, s.ColumnString16(index++));
      profile.SetRawInfo(ADDRESS_HOME_STATE, s.ColumnString16(index++));
      profile.SetRawInfo(ADDRESS_HOME_ZIP, s.ColumnString16(index++));
      profile.SetInfo(AutofillType(ADDRESS_HOME_COUNTRY),
                      s.ColumnString16(index++), app_locale_);
      profile.SetRawInfo(PHONE_HOME_WHOLE_NUMBER, s.ColumnString16(index++));
      int64 date_modified = s.ColumnInt64(index++);

      sql::Statement s_insert(db_->GetUniqueStatement(
          "INSERT INTO autofill_profiles_temp"
          "(guid, company_name, address_line_1, address_line_2, city,"
          " state, zipcode, country, date_modified)"
          "VALUES (?,?,?,?,?,?,?,?,?)"));
      index = 0;
      s_insert.BindString(index++, profile.guid());
      s_insert.BindString16(index++, profile.GetRawInfo(COMPANY_NAME));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_LINE1));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_LINE2));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_CITY));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_STATE));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_ZIP));
      s_insert.BindString16(index++, profile.GetRawInfo(ADDRESS_HOME_COUNTRY));
      s_insert.BindInt64(index++, date_modified);

      if (!s_insert.Run())
        return false;

      // Add the other bits: names, emails, and phone numbers.
      if (!AddAutofillProfileNamesForVersion3x(profile, db_) ||
          !AddAutofillProfileEmails(profile, db_) ||
          !AddAutofillProfilePhones(profile, db_)) {
        return false;
      }
    }  // endwhile
    if (!s.Succeeded())
      return false;

    if (!db_->Execute("DROP TABLE autofill_profiles"))
      return false;

    if (!db_->Execute(
        "ALTER TABLE autofill_profiles_temp RENAME TO autofill_profiles")) {
      return false;
    }
  }

  // Remove the labels column from the credit_cards table.
  if (db_->DoesColumnExist("credit_cards", "label")) {
    if (!db_->Execute("CREATE TABLE credit_cards_temp ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "name_on_card VARCHAR, "
                      "expiration_month INTEGER, "
                      "expiration_year INTEGER, "
                      "card_number_encrypted BLOB, "
                      "date_modified INTEGER NOT NULL DEFAULT 0)")) {
      return false;
    }

    if (!db_->Execute(
        "INSERT INTO credit_cards_temp "
        "SELECT guid, name_on_card, expiration_month, "
        "expiration_year, card_number_encrypted, date_modified "
        "FROM credit_cards")) {
      return false;
    }

    if (!db_->Execute("DROP TABLE credit_cards"))
      return false;

    if (!db_->Execute("ALTER TABLE credit_cards_temp RENAME TO credit_cards"))
      return false;
  }

  return true;
}

// Test the existence of the |country_code| column as an indication that
// we need a migration.  It is possible that the new |autofill_profiles|
// schema is in place because the table was newly created when migrating
// from a pre-version-22 database.
bool AutofillTable::MigrateToVersion34ProfilesBasedOnCountryCode() {
  if (!db_->DoesColumnExist("autofill_profiles", "country_code")) {
    if (!db_->Execute("ALTER TABLE autofill_profiles ADD COLUMN "
                      "country_code VARCHAR")) {
      return false;
    }

    // Set all the |country_code| fields to match existing |country| values.
    sql::Statement s(db_->GetUniqueStatement("SELECT guid, country "
                                             "FROM autofill_profiles"));

    while (s.Step()) {
      sql::Statement update_s(
          db_->GetUniqueStatement("UPDATE autofill_profiles "
                                  "SET country_code=? WHERE guid=?"));

      base::string16 country = s.ColumnString16(1);
      update_s.BindString(0, AutofillCountry::GetCountryCode(country,
                                                             app_locale_));
      update_s.BindString(1, s.ColumnString(0));

      if (!update_s.Run())
        return false;
    }
    if (!s.Succeeded())
      return false;
  }

  return true;
}

// Correct all country codes with value "UK" to be "GB".  This data
// was mistakenly introduced in build 686.0.  This migration is to clean
// it up.  See http://crbug.com/74511 for details.
bool AutofillTable::MigrateToVersion35GreatBritainCountryCodes() {
  sql::Statement s(db_->GetUniqueStatement(
      "UPDATE autofill_profiles SET country_code=\"GB\" "
      "WHERE country_code=\"UK\""));

  return s.Run();
}

// Merge and cull older profiles where possible.
bool AutofillTable::MigrateToVersion37MergeAndCullOlderProfiles() {
  if (!db_->DoesTableExist("autofill_profiles_trash") &&
      !db_->Execute("CREATE TABLE autofill_profiles_trash (guid VARCHAR)"))
    return false;

  sql::Statement s(db_->GetUniqueStatement(
      "SELECT guid, date_modified FROM autofill_profiles"));

  // Accumulate the good profiles.
  std::vector<AutofillProfile> accumulated_profiles;
  std::vector<AutofillProfile*> accumulated_profiles_p;
  std::map<std::string, int64> modification_map;
  while (s.Step()) {
    std::string guid = s.ColumnString(0);
    int64 date_modified = s.ColumnInt64(1);
    modification_map.insert(
        std::pair<std::string, int64>(guid, date_modified));

    sql::Statement s(db_->GetUniqueStatement(
        "SELECT guid, company_name, address_line_1, address_line_2, city, "
        " state, zipcode, country, country_code, date_modified "
        "FROM autofill_profiles "
        "WHERE guid=?"));
    s.BindString(0, guid);

    if (!s.Step())
      return false;

    scoped_ptr<AutofillProfile> profile(new AutofillProfile);
    int index = 0;
    profile->set_guid(s.ColumnString(index++));
    DCHECK(base::IsValidGUID(profile->guid()));

    profile->SetRawInfo(COMPANY_NAME, s.ColumnString16(index++));
    profile->SetRawInfo(ADDRESS_HOME_LINE1, s.ColumnString16(index++));
    profile->SetRawInfo(ADDRESS_HOME_LINE2, s.ColumnString16(index++));
    profile->SetRawInfo(ADDRESS_HOME_CITY, s.ColumnString16(index++));
    profile->SetRawInfo(ADDRESS_HOME_STATE, s.ColumnString16(index++));
    profile->SetRawInfo(ADDRESS_HOME_ZIP, s.ColumnString16(index++));
    // Intentionally skip column 7, which stores the localized country name.
    index++;
    profile->SetRawInfo(ADDRESS_HOME_COUNTRY, s.ColumnString16(index++));
    // Intentionally skip column 9, which stores the profile's modification
    // date.
    index++;
    profile->set_origin(s.ColumnString(index++));

    // Get associated name info.
    AddAutofillProfileNamesToProfileForVersion37(db_, profile.get());

    // Get associated email info.
    AddAutofillProfileEmailsToProfile(db_, profile.get());

    // Get associated phone info.
    AddAutofillProfilePhonesToProfile(db_, profile.get());

    if (PersonalDataManager::IsValidLearnableProfile(*profile, app_locale_)) {
      std::vector<AutofillProfile> merged_profiles;
      std::string merged_guid = PersonalDataManager::MergeProfile(
          *profile, accumulated_profiles_p, app_locale_, &merged_profiles);

      std::swap(accumulated_profiles, merged_profiles);

      accumulated_profiles_p.clear();
      accumulated_profiles_p.resize(accumulated_profiles.size());
      std::transform(accumulated_profiles.begin(),
                     accumulated_profiles.end(),
                     accumulated_profiles_p.begin(),
                     address_of<AutofillProfile>);

      // If the profile got merged trash the original.
      if (merged_guid != profile->guid())
        AddAutofillGUIDToTrash(profile->guid());
    } else {
      // An invalid profile, so trash it.
      AddAutofillGUIDToTrash(profile->guid());
    }
  }  // endwhile
  if (!s.Succeeded())
    return false;

  // Drop the current profiles.
  if (!ClearAutofillProfiles())
    return false;

  // Add the newly merged profiles back in.
  for (std::vector<AutofillProfile>::const_iterator
          iter = accumulated_profiles.begin();
       iter != accumulated_profiles.end();
       ++iter) {
    // Save the profile with its original modification date.
    std::map<std::string, int64>::const_iterator date_item =
        modification_map.find(iter->guid());
    if (date_item == modification_map.end())
      return false;

    sql::Statement s(db_->GetUniqueStatement(
        "INSERT INTO autofill_profiles"
        "(guid, company_name, address_line_1, address_line_2, city, state,"
        " zipcode, country, country_code, date_modified)"
        "VALUES (?,?,?,?,?,?,?,?,?,?)"));
    int index = 0;
    s.BindString(index++, iter->guid());
    s.BindString16(index++, GetInfo(*iter, COMPANY_NAME));
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_LINE1));
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_LINE2));
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_CITY));
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_STATE));
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_ZIP));
    s.BindString16(index++, base::string16());  // This column is deprecated.
    s.BindString16(index++, GetInfo(*iter, ADDRESS_HOME_COUNTRY));
    s.BindInt64(index++, date_item->second);

    if (!s.Run())
      return false;

    if (!AddAutofillProfileNamesForVersion3x(*iter, db_) ||
        !AddAutofillProfileEmails(*iter, db_) ||
        !AddAutofillProfilePhones(*iter, db_)) {
      return false;
    }
  }

  return true;
}

bool AutofillTable::MigrateToVersion51AddOriginColumn() {
  sql::Transaction transaction(db_);
  if (!transaction.Begin())
    return false;

  // Add origin to autofill_profiles.
  if (!db_->DoesColumnExist("autofill_profiles", "origin") &&
      !db_->Execute("ALTER TABLE autofill_profiles "
                    "ADD COLUMN origin VARCHAR DEFAULT ''")) {
    return false;
  }

  // Add origin to credit_cards.
  if (!db_->DoesColumnExist("credit_cards", "origin") &&
      !db_->Execute("ALTER TABLE credit_cards "
                    "ADD COLUMN origin VARCHAR DEFAULT ''")) {
      return false;
  }

  return transaction.Commit();
}

bool AutofillTable::MigrateToVersion54AddI18nFieldsAndRemoveDeprecatedFields() {
  sql::Transaction transaction(db_);
  if (!transaction.Begin())
    return false;

  // Test the existence of the |address_line_1| column as an indication that a
  // migration is needed.  It is possible that the new |autofill_profile_phones|
  // schema is in place because the table was newly created when migrating from
  // a pre-version-23 database.
  if (db_->DoesColumnExist("autofill_profiles", "address_line_1")) {
    // Create a temporary copy of the autofill_profiles table in the (newer)
    // version 54 format.  This table
    //   (a) adds columns for street_address, dependent_locality, and
    //       sorting_code,
    //   (b) removes the address_line_1 and address_line_2 columns, which are
    //       replaced by the street_address column, and
    //   (c) removes the country column, which was long deprecated.
    if (db_->DoesTableExist("autofill_profiles_temp") ||
        !db_->Execute("CREATE TABLE autofill_profiles_temp ( "
                      "guid VARCHAR PRIMARY KEY, "
                      "company_name VARCHAR, "
                      "street_address VARCHAR, "
                      "dependent_locality VARCHAR, "
                      "city VARCHAR, "
                      "state VARCHAR, "
                      "zipcode VARCHAR, "
                      "sorting_code VARCHAR, "
                      "country_code VARCHAR, "
                      "date_modified INTEGER NOT NULL DEFAULT 0, "
                      "origin VARCHAR DEFAULT '')")) {
      return false;
    }

    // Copy over the data from the autofill_profiles table, taking care to merge
    // the address lines 1 and 2 into the new street_address column.
    if (!db_->Execute("INSERT INTO autofill_profiles_temp "
                      "SELECT guid, company_name, '', '', city, state, zipcode,"
                      " '', country_code, date_modified, origin "
                      "FROM autofill_profiles")) {
      return false;
    }
    sql::Statement s(db_->GetUniqueStatement(
        "SELECT guid, address_line_1, address_line_2 FROM autofill_profiles"));
    while (s.Step()) {
      std::string guid = s.ColumnString(0);
      base::string16 line1 = s.ColumnString16(1);
      base::string16 line2 = s.ColumnString16(2);
      base::string16 street_address = line1;
      if (!line2.empty())
        street_address += base::ASCIIToUTF16("\n") + line2;

      sql::Statement s_update(db_->GetUniqueStatement(
          "UPDATE autofill_profiles_temp SET street_address=? WHERE guid=?"));
      s_update.BindString16(0, street_address);
      s_update.BindString(1, guid);
      if (!s_update.Run())
        return false;
    }
    if (!s.Succeeded())
      return false;

    // Delete the existing (version 53) table and replace it with the contents
    // of the temporary table.
    if (!db_->Execute("DROP TABLE autofill_profiles") ||
        !db_->Execute("ALTER TABLE autofill_profiles_temp "
                      "RENAME TO autofill_profiles")) {
      return false;
    }
  }

  // Test the existence of the |type| column as an indication that a migration
  // is needed.  It is possible that the new |autofill_profile_phones| schema is
  // in place because the table was newly created when migrating from a
  // pre-version-23 database.
  if (db_->DoesColumnExist("autofill_profile_phones", "type")) {
    // Create a temporary copy of the autofill_profile_phones table in the
    // (newer) version 54 format.  This table removes the deprecated |type|
    // column.
    if (db_->DoesTableExist("autofill_profile_phones_temp") ||
        !db_->Execute("CREATE TABLE autofill_profile_phones_temp ( "
                      "guid VARCHAR, "
                      "number VARCHAR)")) {
      return false;
    }

    // Copy over the data from the autofill_profile_phones table.
    if (!db_->Execute("INSERT INTO autofill_profile_phones_temp "
                      "SELECT guid, number FROM autofill_profile_phones")) {
      return false;
    }

    // Delete the existing (version 53) table and replace it with the contents
    // of the temporary table.
    if (!db_->Execute("DROP TABLE autofill_profile_phones"))
      return false;
    if (!db_->Execute("ALTER TABLE autofill_profile_phones_temp "
                      "RENAME TO autofill_profile_phones")) {
      return false;
    }
  }

  return transaction.Commit();
}

bool AutofillTable::MigrateToVersion55MergeAutofillDatesTable() {
  sql::Transaction transaction(db_);
  if (!transaction.Begin())
    return false;

  if (db_->DoesTableExist("autofill_temp") ||
      !db_->Execute("CREATE TABLE autofill_temp ("
                    "name VARCHAR, "
                    "value VARCHAR, "
                    "value_lower VARCHAR, "
                    "date_created INTEGER DEFAULT 0, "
                    "date_last_used INTEGER DEFAULT 0, "
                    "count INTEGER DEFAULT 1, "
                    "PRIMARY KEY (name, value))")) {
    return false;
  }

  // Slurp up the data from the existing table and write it to the new table.
  sql::Statement s(db_->GetUniqueStatement(
      "SELECT name, value, value_lower, count, MIN(date_created),"
      " MAX(date_created) "
      "FROM autofill a JOIN autofill_dates ad ON a.pair_id=ad.pair_id "
      "GROUP BY name, value, value_lower, count"));
  while (s.Step()) {
    sql::Statement s_insert(db_->GetUniqueStatement(
        "INSERT INTO autofill_temp "
        "(name, value, value_lower, count, date_created, date_last_used) "
        "VALUES (?, ?, ?, ?, ?, ?)"));
    s_insert.BindString16(0, s.ColumnString16(0));
    s_insert.BindString16(1, s.ColumnString16(1));
    s_insert.BindString16(2, s.ColumnString16(2));
    s_insert.BindInt(3, s.ColumnInt(3));
    s_insert.BindInt64(4, s.ColumnInt64(4));
    s_insert.BindInt64(5, s.ColumnInt64(5));
    if (!s_insert.Run())
      return false;
  }

  if (!s.Succeeded())
    return false;

  // Delete the existing (version 54) tables and replace them with the contents
  // of the temporary table.
  if (!db_->Execute("DROP TABLE autofill") ||
      !db_->Execute("DROP TABLE autofill_dates") ||
      !db_->Execute("ALTER TABLE autofill_temp "
                    "RENAME TO autofill")) {
    return false;
  }

  // Create indices on the new table, for fast lookups.
  if (!db_->Execute("CREATE INDEX autofill_name ON autofill (name)") ||
      !db_->Execute("CREATE INDEX autofill_name_value_lower ON "
                    "autofill (name, value_lower)")) {
    return false;
  }


  return transaction.Commit();
}

bool AutofillTable::MigrateToVersion56AddProfileLanguageCodeForFormatting() {
  return db_->Execute("ALTER TABLE autofill_profiles "
                      "ADD COLUMN language_code VARCHAR");
}

bool AutofillTable::MigrateToVersion57AddFullNameField() {
  return db_->Execute("ALTER TABLE autofill_profile_names "
                      "ADD COLUMN full_name VARCHAR");
}

}  // namespace autofill