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      1 # 2007 May 14
      2 #
      3 # The author disclaims copyright to this source code.  In place of
      4 # a legal notice, here is a blessing:
      5 #
      6 #    May you do good and not evil.
      7 #    May you find forgiveness for yourself and forgive others.
      8 #    May you share freely, never taking more than you give.
      9 #
     10 #***********************************************************************
     11 # This file implements regression tests for SQLite library.  The
     12 # focus of this file is testing the built-in SUBSTR() functions.
     13 #
     14 # $Id: substr.test,v 1.7 2009/02/03 13:10:54 drh Exp $
     15 
     16 set testdir [file dirname $argv0]
     17 source $testdir/tester.tcl
     18 
     19 ifcapable !tclvar {
     20   finish_test
     21   return
     22 }
     23 
     24 # Create a table to work with.
     25 #
     26 execsql { 
     27   CREATE TABLE t1(t text, b blob)
     28 }
     29 proc substr-test {id string i1 i2 result} {
     30   db eval {
     31     DELETE FROM t1;
     32     INSERT INTO t1(t) VALUES($string)
     33   }
     34   do_test substr-$id.1 [subst {
     35     execsql {
     36       SELECT substr(t, $i1, $i2) FROM t1
     37     }
     38   }] [list $result]
     39   set qstr '[string map {' ''} $string]'
     40   do_test substr-$id.2 [subst {
     41     execsql {
     42       SELECT substr($qstr, $i1, $i2)
     43     }
     44   }] [list $result]
     45 }
     46 proc subblob-test {id hex i1 i2 hexresult} {
     47   db eval "
     48     DELETE FROM t1;
     49     INSERT INTO t1(b) VALUES(x'$hex')
     50   "
     51   do_test substr-$id.1 [subst {
     52     execsql {
     53       SELECT hex(substr(b, $i1, $i2)) FROM t1
     54     }
     55   }] [list $hexresult]
     56   do_test substr-$id.2 [subst {
     57     execsql {
     58       SELECT hex(substr(x'$hex', $i1, $i2))
     59     }
     60   }] [list $hexresult]
     61 }
     62 
     63 # Basic SUBSTR functionality
     64 #
     65 substr-test 1.1 abcdefg 1 1 a
     66 substr-test 1.2 abcdefg 2 1 b
     67 substr-test 1.3 abcdefg 1 2 ab
     68 substr-test 1.4 abcdefg 1 100 abcdefg
     69 substr-test 1.5 abcdefg 0 2 a
     70 substr-test 1.6 abcdefg -1 1 g
     71 substr-test 1.7 abcdefg -1 10 g
     72 substr-test 1.8 abcdefg -5 3 cde
     73 substr-test 1.9 abcdefg -7 3 abc
     74 substr-test 1.10 abcdefg -100 98 abcde
     75 substr-test 1.11 abcdefg 5 -1 d
     76 substr-test 1.12 abcdefg 5 -4 abcd
     77 substr-test 1.13 abcdefg 5 -5 abcd
     78 substr-test 1.14 abcdefg -5 -1 b
     79 substr-test 1.15 abcdefg -5 -2 ab
     80 substr-test 1.16 abcdefg -5 -3 ab
     81 substr-test 1.17 abcdefg 100 200 {}
     82 substr-test 1.18 abcdefg 200 100 {}
     83 
     84 # Make sure NULL is returned if any parameter is NULL
     85 #
     86 do_test substr-1.90 {
     87   db eval {SELECT ifnull(substr(NULL,1,1),'nil')}
     88 } nil
     89 do_test substr-1.91 {
     90   db eval {SELECT ifnull(substr(NULL,1),'nil')}
     91 } nil
     92 do_test substr-1.92 {
     93   db eval {SELECT ifnull(substr('abcdefg',NULL,1),'nil')}
     94 } nil
     95 do_test substr-1.93 {
     96   db eval {SELECT ifnull(substr('abcdefg',NULL),'nil')}
     97 } nil
     98 do_test substr-1.94 {
     99   db eval {SELECT ifnull(substr('abcdefg',1,NULL),'nil')}
    100 } nil
    101 
    102 # Make sure everything works with long unicode characters
    103 #
    104 substr-test 2.1 \u1234\u2345\u3456 1 1 \u1234
    105 substr-test 2.2 \u1234\u2345\u3456 2 1 \u2345
    106 substr-test 2.3 \u1234\u2345\u3456 1 2 \u1234\u2345
    107 substr-test 2.4 \u1234\u2345\u3456 -1 1 \u3456
    108 substr-test 2.5 a\u1234b\u2345c\u3456c -5 3 b\u2345c
    109 substr-test 2.6 a\u1234b\u2345c\u3456c -2 -3 b\u2345c
    110 
    111 # Basic functionality for BLOBs
    112 #
    113 subblob-test 3.1 61626364656667 1 1 61
    114 subblob-test 3.2 61626364656667 2 1 62
    115 subblob-test 3.3 61626364656667 1 2 6162
    116 subblob-test 3.4 61626364656667 1 100 61626364656667
    117 subblob-test 3.5 61626364656667 0 2 61
    118 subblob-test 3.6 61626364656667 -1 1 67
    119 subblob-test 3.7 61626364656667 -1 10 67
    120 subblob-test 3.8 61626364656667 -5 3 636465
    121 subblob-test 3.9 61626364656667 -7 3 616263
    122 subblob-test 3.10 61626364656667 -100 98 6162636465
    123 subblob-test 3.11 61626364656667 100 200 {}
    124 subblob-test 3.12 61626364656667 200 100 {}
    125 
    126 # If these blobs were strings, then they would contain multi-byte
    127 # characters.  But since they are blobs, the substr indices refer
    128 # to bytes.
    129 #
    130 subblob-test 4.1 61E188B462E28D8563E3919663 1 1 61
    131 subblob-test 4.2 61E188B462E28D8563E3919663 2 1 E1
    132 subblob-test 4.3 61E188B462E28D8563E3919663 1 2 61E1
    133 subblob-test 4.4 61E188B462E28D8563E3919663 -2 1 96
    134 subblob-test 4.5 61E188B462E28D8563E3919663 -5 4 63E39196
    135 subblob-test 4.6 61E188B462E28D8563E3919663 -100 98 61E188B462E28D8563E391 
    136 
    137 # Two-argument SUBSTR
    138 #
    139 proc substr-2-test {id string idx result} {
    140   db eval {
    141     DELETE FROM t1;
    142     INSERT INTO t1(t) VALUES($string)
    143   }
    144   do_test substr-$id.1 [subst {
    145     execsql {
    146       SELECT substr(t, $idx) FROM t1
    147     }
    148   }] [list $result]
    149   set qstr '[string map {' ''} $string]'
    150   do_test substr-$id.2 [subst {
    151     execsql {
    152       SELECT substr($qstr, $idx)
    153     }
    154   }] [list $result]
    155 }
    156 substr-2-test 5.1 abcdefghijklmnop 5 efghijklmnop
    157 substr-2-test 5.2 abcdef -5 bcdef
    158 
    159 finish_test
    160