Fixed bug #29788.

After dumping triggers mysqldump copied 
the value of the OLD_SQL_MODE variable to the SQL_MODE
variable. If the --compact option of the mysqldump was
not set the OLD_SQL_MODE variable had the value
of the uninitialized SQL_MODE variable. So
usually the NO_AUTO_VALUE_ON_ZERO option of the
SQL_MODE variable was discarded.

This fix is for non-"--compact" mode of the mysqldump,
because mysqldump --compact never set SQL_MODE to the
value of NO_AUTO_VALUE_ON_ZERO.

The dump_triggers_for_table function has been modified
to restore previous value of the SQL_MODE variable after
dumping triggers using the SAVE_SQL_MODE temporary
variable.

client/mysqldump.c

@@ -2122,8 +2122,7 @@ static void dump_triggers_for_table(char *table,
   }
   if (mysql_num_rows(result))
   {
-    if (opt_compact)
-      fprintf(sql_file, "\n/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;\n");
+    fprintf(sql_file, "\n/*!50003 SET @SAVE_SQL_MODE=@@SQL_MODE*/;\n");
     fprintf(sql_file, "\nDELIMITER ;;\n");
   }
   while ((row= mysql_fetch_row(result)))
@@ -2167,9 +2166,11 @@ static void dump_triggers_for_table(char *table,
             row[3] /* Statement */);
   }
   if (mysql_num_rows(result))
+  {
     fprintf(sql_file,
             "DELIMITER ;\n"
-            "/*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE */;\n");
+            "/*!50003 SET SESSION SQL_MODE=@SAVE_SQL_MODE*/;\n");
+  }
   mysql_free_result(result);
   /*
     make sure to set back opt_compatible mode to

mysql-test/r/mysqldump.result

@@ -2238,6 +2238,8 @@ INSERT INTO `t1` VALUES (1,NULL),(2,NULL),(4,NULL),(11,NULL);
 /*!40000 ALTER TABLE `t1` ENABLE KEYS */;
 UNLOCK TABLES;
 
+/*!50003 SET @SAVE_SQL_MODE=@@SQL_MODE*/;
+
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `trg1` BEFORE INSERT ON `t1` FOR EACH ROW begin
@@ -2260,7 +2262,7 @@ end if;
 end */;;
 
 DELIMITER ;
-/*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE */;
+/*!50003 SET SESSION SQL_MODE=@SAVE_SQL_MODE*/;
 DROP TABLE IF EXISTS `t2`;
 CREATE TABLE `t2` (
   `a` int(11) default NULL
@@ -2271,6 +2273,8 @@ LOCK TABLES `t2` WRITE;
 /*!40000 ALTER TABLE `t2` ENABLE KEYS */;
 UNLOCK TABLES;
 
+/*!50003 SET @SAVE_SQL_MODE=@@SQL_MODE*/;
+
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `trg4` BEFORE INSERT ON `t2` FOR EACH ROW begin
@@ -2280,7 +2284,7 @@ end if;
 end */;;
 
 DELIMITER ;
-/*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE */;
+/*!50003 SET SESSION SQL_MODE=@SAVE_SQL_MODE*/;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
 
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
@@ -2628,13 +2632,15 @@ INSERT INTO "t1 test" VALUES (1),(2),(3);
 /*!40000 ALTER TABLE "t1 test" ENABLE KEYS */;
 UNLOCK TABLES;
 
+/*!50003 SET @SAVE_SQL_MODE=@@SQL_MODE*/;
+
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `test trig` BEFORE INSERT ON `t1 test` FOR EACH ROW BEGIN
 INSERT INTO `t2 test` SET a2 = NEW.a1; END */;;
 
 DELIMITER ;
-/*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE */;
+/*!50003 SET SESSION SQL_MODE=@SAVE_SQL_MODE*/;
 DROP TABLE IF EXISTS "t2 test";
 CREATE TABLE "t2 test" (
   "a2" int(11) default NULL
@@ -2788,6 +2794,8 @@ LOCK TABLES `t1` WRITE;
 /*!40000 ALTER TABLE `t1` ENABLE KEYS */;
 UNLOCK TABLES;
 
+/*!50003 SET @SAVE_SQL_MODE=@@SQL_MODE*/;
+
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="IGNORE_SPACE" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `tr1` BEFORE INSERT ON `t1` FOR EACH ROW BEGIN
@@ -2795,7 +2803,7 @@ SET new.a = 0;
 END */;;
 
 DELIMITER ;
-/*!50003 SET SESSION SQL_MODE=@OLD_SQL_MODE */;
+/*!50003 SET SESSION SQL_MODE=@SAVE_SQL_MODE*/;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
 
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
@@ -3334,5 +3342,27 @@ SELECT * FROM v1;
 1
 DROP VIEW v1;
 #
+# Bug #29788: mysqldump discards the NO_AUTO_VALUE_ON_ZERO value of
+#             the SQL_MODE variable after the dumping of triggers.
+#
+CREATE TABLE t1 (c1 INT);
+CREATE TRIGGER t1bd BEFORE DELETE ON t1 FOR EACH ROW BEGIN END;
+CREATE TABLE t2 (c1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY);
+SET @TMP_SQL_MODE = @@SQL_MODE;
+SET SQL_MODE = 'NO_AUTO_VALUE_ON_ZERO';
+INSERT INTO t2 VALUES (0), (1), (2);
+SET SQL_MODE = @TMP_SQL_MODE;
+SELECT * FROM t2;
+c1
+0
+1
+2
+SELECT * FROM t2;
+c1
+0
+1
+2
+DROP TABLE t1,t2;
+#
 # End of 5.0 tests
 #

mysql-test/t/mysqldump.test

@@ -1554,6 +1554,28 @@ DROP VIEW v1;
 SELECT * FROM v1;
 DROP VIEW v1;
 
+--echo #
+--echo # Bug #29788: mysqldump discards the NO_AUTO_VALUE_ON_ZERO value of
+--echo #             the SQL_MODE variable after the dumping of triggers.
+--echo #
+
+CREATE TABLE t1 (c1 INT);
+CREATE TRIGGER t1bd BEFORE DELETE ON t1 FOR EACH ROW BEGIN END;
+
+CREATE TABLE t2 (c1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY);
+
+SET @TMP_SQL_MODE = @@SQL_MODE;
+SET SQL_MODE = 'NO_AUTO_VALUE_ON_ZERO';
+INSERT INTO t2 VALUES (0), (1), (2);
+SET SQL_MODE = @TMP_SQL_MODE;
+SELECT * FROM t2;
+
+--exec $MYSQL_DUMP --routines test >$MYSQLTEST_VARDIR/tmp/bug29788.sql
+--exec $MYSQL test < $MYSQLTEST_VARDIR/tmp/bug29788.sql
+SELECT * FROM t2;
+
+DROP TABLE t1,t2;
+
 --echo #
 --echo # End of 5.0 tests
 --echo #