1 package SQLite; 2 3 /** 4 * Class to represent compiled SQLite VM. 5 */ 6 7 public class Vm { 8 9 /** 10 * Internal handle for the compiled SQLite VM. 11 */ 12 13 private long handle = 0; 14 15 /** 16 * Internal last error code for compile()/step() methods. 17 */ 18 19 protected int error_code = 0; 20 21 /** 22 * Perform one step on compiled SQLite VM. 23 * The result row is passed to the given callback interface.<BR><BR> 24 * 25 * Example:<BR> 26 * <PRE> 27 * ... 28 * try { 29 * Vm vm = db.compile("select * from x; select * from y;"); 30 * while (vm.step(cb)) { 31 * ... 32 * } 33 * while (vm.compile()) { 34 * while (vm.step(cb)) { 35 * ... 36 * } 37 * } 38 * } catch (SQLite.Exception e) { 39 * } 40 * </PRE> 41 * 42 * @param cb the object implementing the callback methods. 43 * @return true as long as more row data can be retrieved, 44 * false, otherwise. 45 */ 46 47 public native boolean step(Callback cb) throws SQLite.Exception; 48 49 /** 50 * Compile the next SQL statement for the SQLite VM instance. 51 * @return true when SQL statement has been compiled, false 52 * on end of statement sequence. 53 */ 54 55 public native boolean compile() throws SQLite.Exception; 56 57 /** 58 * Abort the compiled SQLite VM. 59 */ 60 61 public native void stop() throws SQLite.Exception; 62 63 /** 64 * Destructor for object. 65 */ 66 67 protected native void finalize(); 68 69 /** 70 * Internal native initializer. 71 */ 72 73 private static native void internal_init(); 74 75 static { 76 internal_init(); 77 } 78 } 79
