SQLite

    ** early.  */
    if( pParse->disableTriggers ){
      pTo = sqlite3FindTable(db, pFKey->zTo, zDb);
    }else{
      pTo = sqlite3LocateTable(pParse, 0, pFKey->zTo, zDb);
    }
    if( !pTo || locateFkeyIndex(pParse, pTo, pFKey, &pIdx, &aiFree) ){
      assert( isIgnoreErrors==0 || (regOld!=0 && regNew==0) );
      if( !isIgnoreErrors || db->mallocFailed ) return;
      if( isIgnoreErrors && pTo==0 ){
        /* If isIgnoreErrors is true, then a table is being dropped. In this
        ** case SQLite runs a "DELETE FROM xxx" on the table being dropped
        ** before actually dropping it in order to check FK constraints.
        ** If the parent table of an FK constraint on the current table is
        ** missing, behave as if it is empty. i.e. decrement the relevant
        ** FK counter for each row of the current table with non-NULL keys.
        */
        Vdbe *v = sqlite3GetVdbe(pParse);
        int iJump = sqlite3VdbeCurrentAddr(v) + pFKey->nCol + 1;
        for(i=0; i<pFKey->nCol; i++){
          int iReg = pFKey->aCol[i].iFrom + regOld + 1;
          sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iJump);
        }
        sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, -1);
      }
      continue;
    }
    assert( pFKey->nCol==1 || (aiFree && pIdx) );

    if( aiFree ){
      aiCol = aiFree;
    }else{

# 2011 August 22
#
# 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.
#
# This file implements tests for foreign keys. Specifically, it tests
# that ticket b1d3a2e531 has been fixed.
#

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

ifcapable {!foreignkey||!trigger} {
  finish_test
  return
}
set testprefix tkt-b1d3a2e531

do_execsql_test 1.0 { PRAGMA foreign_keys = ON }

do_execsql_test 1.1 {
  CREATE TABLE pp(x PRIMARY KEY);
  CREATE TABLE cc(y REFERENCES pp DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO pp VALUES('abc');
  INSERT INTO cc VALUES('abc');
}
do_execsql_test 1.2 {
  BEGIN;
    DROP TABLE pp;
    DROP TABLE cc;
  COMMIT;
}
do_execsql_test 1.3 {
  CREATE TABLE pp(x PRIMARY KEY);
  CREATE TABLE cc(y REFERENCES pp DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO pp VALUES('abc');
  INSERT INTO cc VALUES('abc');
}
do_execsql_test 1.4 {
  BEGIN;
    DROP TABLE cc;
    DROP TABLE pp;
  COMMIT;
}

do_execsql_test 2.1 {
  CREATE TABLE pp(x PRIMARY KEY);
  CREATE TABLE cc(
    y INTEGER PRIMARY KEY REFERENCES pp DEFERRABLE INITIALLY DEFERRED
  );
  INSERT INTO pp VALUES(5);
  INSERT INTO cc VALUES(5);
}
do_execsql_test 2.2 {
  BEGIN;
    DROP TABLE pp;
    DROP TABLE cc;
  COMMIT;
}
do_execsql_test 2.3 {
  CREATE TABLE pp(x PRIMARY KEY);
  CREATE TABLE cc(
    y INTEGER PRIMARY KEY REFERENCES pp DEFERRABLE INITIALLY DEFERRED
  );
  INSERT INTO pp VALUES(5);
  INSERT INTO cc VALUES(5);
}
do_execsql_test 2.4 {
  BEGIN;
    DROP TABLE cc;
    DROP TABLE pp;
  COMMIT;
}

do_execsql_test 3.1 {
  CREATE TABLE pp1(x PRIMARY KEY);
  CREATE TABLE cc1(y REFERENCES pp1 DEFERRABLE INITIALLY DEFERRED);

  CREATE TABLE pp2(x PRIMARY KEY);
  CREATE TABLE cc2(y REFERENCES pp1 DEFERRABLE INITIALLY DEFERRED);

  INSERT INTO pp1 VALUES(2200);
  INSERT INTO cc1 VALUES(NULL);

  INSERT INTO pp2 VALUES(2200);
  INSERT INTO cc2 VALUES(2200);
}
do_catchsql_test 3.2 {
  BEGIN;
    DELETE FROM pp2;
    DROP TABLE pp1;
    DROP TABLE cc1;
  COMMIT;
} {1 {foreign key constraint failed}}
do_catchsql_test 3.3 {
    DROP TABLE cc2;
  COMMIT;
} {0 {}}



finish_test