test/triggerE.test

# 2009 December 29
#
# 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 tests the effects of SQL variable references embedded in
# triggers. If the user attempts to create such a trigger, it is an
# error. However, if an existing trigger definition is read from
# the sqlite_master table, the variable reference always evaluates
# to NULL.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!trigger} {
  finish_test
  return
}
set testprefix triggerE

do_execsql_test 1.0 {
  CREATE TABLE t1(a, b);
  CREATE TABLE t2(c, d);
  CREATE TABLE t3(e, f);
}

# forcedelete test.db2
# do_execsql_test 1.1 {
#   ATTACH 'test.db2' AS aux;
#   CREATE TABLE aux.t4(x);
#   INSERT INTO aux.t4 VALUES(5);
# 
#   CREATE TRIGGER tr1 AFTER INSERT ON t1 WHEN new.a IN (SELECT x FROM aux.t4)
#   BEGIN
#     SELECT 1;
#   END;
# } 
# do_execsql_test 1.2 { INSERT INTO t1 VALUES(1,1); }
# do_execsql_test 1.3 { INSERT INTO t1 VALUES(5,5); }

#-------------------------------------------------------------------------
# Attempt to create various triggers that use bound variables.
#
set errmsg "trigger cannot use variables"
foreach {tn defn} {
  1 { AFTER INSERT ON t1 WHEN new.a = ? BEGIN SELECT 1; END; }
  2 { BEFORE DELETE ON t1 BEGIN SELECT ?; END; }
  3 { BEFORE DELETE ON t1 BEGIN SELECT * FROM (SELECT * FROM (SELECT ?)); END; }
  5 { BEFORE DELETE ON t1 BEGIN SELECT * FROM t2 GROUP BY ?; END; }
  6 { BEFORE DELETE ON t1 BEGIN SELECT * FROM t2 LIMIT ?; END; }
  7 { BEFORE DELETE ON t1 BEGIN SELECT * FROM t2 ORDER BY ?; END; }
  8 { BEFORE UPDATE ON t1 BEGIN UPDATE t2 SET c = ?; END; }
  9 { BEFORE UPDATE ON t1 BEGIN UPDATE t2 SET c = 1 WHERE d = ?; END; }
} {
  catchsql {drop trigger tr1}
  do_catchsql_test 1.1.$tn "CREATE TRIGGER tr1 $defn" [list 1 $errmsg]
  do_catchsql_test 1.2.$tn "CREATE TEMP TRIGGER tr1 $defn" [list 1 $errmsg]
}

#-------------------------------------------------------------------------
# Test that variable references within trigger definitions loaded from 
# the sqlite_master table are automatically converted to NULL.
#
do_execsql_test 2.1 {
  PRAGMA writable_schema = 1;
  INSERT INTO sqlite_master VALUES('trigger', 'tr1', 't1', 0,
    'CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN 
        INSERT INTO t2 VALUES(?1, ?2); 
     END'
  );

  INSERT INTO sqlite_master VALUES('trigger', 'tr2', 't3', 0,
    'CREATE TRIGGER tr2 AFTER INSERT ON t3 WHEN ?1 IS NULL BEGIN
        UPDATE t2 SET c=d WHERE c IS ?2;
     END'
  );
}
db close
sqlite3 db test.db

do_execsql_test 2.2.1 {
  INSERT INTO t1 VALUES(1, 2);
  SELECT * FROM t2;
} {{} {}}
do_test 2.2.2 {
  set one 3
  execsql {
    DELETE FROM t2;
    INSERT INTO t1 VALUES($one, ?1);
    SELECT * FROM t2;
  }
} {{} {}}
do_execsql_test 2.2.3 { SELECT * FROM t1 } {1 2 3 3}

do_execsql_test 2.3 {
  DELETE FROM t2;
  INSERT INTO t2 VALUES('x', 'y');
  INSERT INTO t2 VALUES(NULL, 'z');
  INSERT INTO t3 VALUES(1, 2);
  SELECT * FROM t3;
  SELECT * FROM t2;
} {1 2 x y z z}

finish_test