SQLite

        Expr *pNew;
        if( action==OE_Cascade ){
          pNew = sqlite3PExpr(pParse, TK_DOT, 
            sqlite3PExpr(pParse, TK_ID, 0, 0, &tNew),
            sqlite3PExpr(pParse, TK_ID, 0, 0, &tToCol)
          , 0);
        }else if( action==OE_SetDflt ){
          Expr *pDflt = pFKey->pFrom->aCol[iFromCol].pDflt;
          if( pDflt ){
            pNew = sqlite3ExprDup(db, pDflt, 0);
          }else{
            pNew = sqlite3PExpr(pParse, TK_NULL, 0, 0, 0);
          }
        }else{
          pNew = sqlite3PExpr(pParse, TK_NULL, 0, 0, 0);

# fkey2-6.*: Test that FK processing is automatically disabled when 
#            running VACUUM.
#
# fkey2-7.*: Test using an IPK as the key in the child (referencing) table.
#
# fkey2-8.*: Test that enabling/disabling foreign key support while a 
#            transaction is active is not possible.
#
# fkey2-9.*: Test SET DEFAULT actions.
#
# fkey2-genfkey.*: Tests that were used with the shell tool .genfkey
#            command. Recycled to test the built-in implementation.
#


proc drop_all_tables {{db db}} {

fkey2-8-test 10 { PRAGMA foreign_keys = 1     } 1
fkey2-8-test 11 { PRAGMA foreign_keys = off   } 0
fkey2-8-test 12 { PRAGMA foreign_keys = on    } 1
fkey2-8-test 13 { PRAGMA foreign_keys = no    } 0
fkey2-8-test 14 { PRAGMA foreign_keys = yes   } 1
fkey2-8-test 15 { PRAGMA foreign_keys = false } 0
fkey2-8-test 16 { PRAGMA foreign_keys = true  } 1

#-------------------------------------------------------------------------
# The following tests, fkey2-9.*, test SET DEFAULT actions.
#
drop_all_tables
do_test fkey2-9.1.1 {
  execsql {
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
    CREATE TABLE t2(
      c INTEGER PRIMARY KEY,
      d INTEGER DEFAULT 1 REFERENCES t1 ON DELETE SET DEFAULT
    );
    DELETE FROM t1;
  }
} {}
do_test fkey2-9.1.2 {
  execsql {
    INSERT INTO t1 VALUES(1, 'one');
    INSERT INTO t1 VALUES(2, 'two');
    INSERT INTO t2 VALUES(1, 2);
    SELECT * FROM t2;
    DELETE FROM t1 WHERE a = 2;
    SELECT * FROM t2;
  }
} {1 2 1 1}
do_test fkey2-9.1.3 {
  execsql {
    INSERT INTO t1 VALUES(2, 'two');
    UPDATE t2 SET d = 2;
    DELETE FROM t1 WHERE a = 1;
    SELECT * FROM t2;
  }
} {1 2}
do_test fkey2-9.1.4 {
  execsql { SELECT * FROM t1 }
} {2 two}
do_test fkey2-9.1.5 {
  catchsql { DELETE FROM t1 }
} {1 {foreign key constraint failed}}

#-------------------------------------------------------------------------
# The following block of tests, those prefixed with "fkey2-genfkey.", are 
# the same tests that were used to test the ".genfkey" command provided 
# by the shell tool. So these tests show that the built-in foreign key 
# implementation is more or less compatible with the triggers generated 
# by genfkey.