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+# 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
+
+