SQLite

2.6.1

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle DELETE FROM statements.
**
** $Id: delete.c,v 1.41 2002/07/19 18:52:41 drh Exp $
*/
#include "sqliteInt.h"


/*
** Given a table name, find the corresponding table and make sure the
** table is writeable.  Generate an error and return NULL if not.  If

  if( pWhere==0 && !row_triggers_exist ){
    if( db->flags & SQLITE_CountRows ){
      /* If counting rows deleted, just count the total number of
      ** entries in the table. */
      int endOfLoop = sqliteVdbeMakeLabel(v);
      int addr;
      openOp = pTab->isTemp ? OP_OpenAux : OP_Open;

      sqliteVdbeAddOp(v, openOp, base, pTab->tnum);
      sqliteVdbeAddOp(v, OP_Rewind, base, sqliteVdbeCurrentAddr(v)+2);
      addr = sqliteVdbeAddOp(v, OP_AddImm, 1, 0);
      sqliteVdbeAddOp(v, OP_Next, base, addr);
      sqliteVdbeResolveLabel(v, endOfLoop);
      sqliteVdbeAddOp(v, OP_Close, base, 0);
    }
    sqliteVdbeAddOp(v, OP_Clear, pTab->tnum, pTab->isTemp);
    for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
      sqliteVdbeAddOp(v, OP_Clear, pIdx->tnum, pTab->isTemp);
    }
  }

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.91 2002/07/19 18:52:41 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information

*/
static
int upgrade_3_callback(void *pInit, int argc, char **argv, char **NotUsed){
  InitData *pData = (InitData*)pInit;
  int rc;
  Table *pTab;
  Trigger *pTrig;
  char *zErr = 0;

  pTab = sqliteFindTable(pData->db, argv[0]);
  if( pTab ){
    pTrig = pTab->pTrigger;
    pTab->pTrigger = 0;  /* Disable all triggers before rebuilding the table */
  }
  rc = sqlite_exec_printf(pData->db,

  sqliteBtreeCloseCursor(curMain);
  return sParse.rc;
}

/*
** The version of the library
*/
static const char rcsid[] = "@(#) $Id: main.c,v 1.91 2002/07/19 18:52:41 drh Exp $";
const char sqlite_version[] = SQLITE_VERSION;

/*
** Does the library expect data to be encoded as UTF-8 or iso8859?  The
** following global constant always lets us know.
*/
#ifdef SQLITE_UTF8

# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the DELETE FROM statement.
#
# $Id: delete.test,v 1.11 2002/07/19 18:52:41 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Try to delete from a non-existant table.
#
do_test delete-1.1 {

  execsql {SELECT f1 FROM table2}
} {}
do_test delete-6.10 {
  execsql {INSERT INTO table2 VALUES(2,3)}
  execsql {SELECT f1 FROM table2}
} {2}

do_test delete-7.1 {
  execsql {
    CREATE TABLE t3(a);
    INSERT INTO t3 VALUES(1);
    INSERT INTO t3 SELECT a+1 FROM t3;
    INSERT INTO t3 SELECT a+2 FROM t3;
    SELECT * FROM t3;
  }
} {1 2 3 4}
do_test delete-7.2 {
  execsql {
    CREATE TABLE cnt(del);
    INSERT INTO cnt VALUES(0);
    CREATE TRIGGER r1 AFTER DELETE ON t3 FOR EACH ROW BEGIN
      UPDATE cnt SET del=del+1;
    END;
    DELETE FROM t3 WHERE a<2;
    SELECT * FROM t3;
  }
} {2 3 4}
do_test delete-7.3 {
  execsql {
    SELECT * FROM cnt;
  }
} {1}
do_test delete-7.4 {
  execsql {
    DELETE FROM t3;
    SELECT * FROM t3;
  }
} {}
do_test delete-7.5 {
  execsql {
    SELECT * FROM cnt;
  }
} {4}
do_test delete-7.6 {
  execsql {
    INSERT INTO t3 VALUES(1);
    INSERT INTO t3 SELECT a+1 FROM t3;
    INSERT INTO t3 SELECT a+2 FROM t3;
    CREATE TABLE t4 AS SELECT * FROM t3;
    PRAGMA count_changes=ON;
    DELETE FROM t3;
    DELETE FROM t4;
  }
} {4 4}


finish_test

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the ability of the library to detect
# past or future file format version numbers and respond appropriately.
#
# $Id: version.test,v 1.4 2002/07/19 18:52:41 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Current file format version
set VX 3

  btree_commit $::bt
  btree_close $::bt
  catch {file attributes test.db -permissions 0444}
  catch {file attributes test.db -readonly 1}
  set rc [catch {sqlite db test.db} msg]
  lappend rc $msg
} {1 {unable to upgrade database to the version 2.6 format: attempt to write a readonly database}}
do_test version-2.2 {
  file delete -force test.db
  set fd [open test.db w]
  set txt "This is not a valid database file\n"
  while {[string length $txt]<4092} {append txt $txt}
  puts $fd $txt
  close $fd
  set rc [catch {sqlite db test.db} msg]
  lappend rc $msg
} {1 {}}


finish_test

proc chng {date desc} {
  puts "<DT><B>$date</B></DT>"
  puts "<DD><P><UL>$desc</UL></P></DD>"
}

chng {2002 Jly 19 (2.6.1)} {
<li>Include a static string in the library that responds to the RCS
    "ident" command and which contains the library version number.</li>
<li>Fix an assertion failure that occurred when deleting all rows of
    a table with the "count_changes" pragma turned on.</li>
<li>Better error reporting when problems occur during the automatic
    2.5.6 to 2.6.0 database format upgrade.</li>
}

chng {2002 Jly 17 (2.6.0)} {
<li>Change the format of indices to correct a design flaw the originated
    with version 2.1.0.  <font color="red">*** This is an incompatible
    file format change ***</font>  When version 2.6.0 or later of the
    library attempts to open a database file created by version 2.5.6 or
    earlier, it will automatically and irreversibly convert the file format.
    <b>Make backup copies of older database files before opening them with
    version 2.6.0 of the library.</b>