Fixed 'Unknown error' when using 'UPDATE ... LIMIT'. Bug 373

mysql-test/r/update.result:
  new test
mysql-test/t/update.test:
  Test of UPDATE ... LIMIT
sql/sql_update.cc:
  Fixed 'Unknown error' when using 'UPDATE ... LIMIT'

mysql-test/r/update.result

@@ -138,3 +138,15 @@ a	b
 111	100
 111	100
 drop table t1;
+CREATE TABLE t1 (
+`id_param` smallint(3) unsigned NOT NULL default '0',
+`nom_option` char(40) NOT NULL default '',
+`valid` tinyint(1) NOT NULL default '0',
+KEY `id_param` (`id_param`,`nom_option`)
+) TYPE=MyISAM;
+INSERT INTO t1 (id_param,nom_option,valid) VALUES (185,'600x1200',1);
+UPDATE t1 SET nom_option='test' WHERE id_param=185 AND nom_option='600x1200' AND valid=1 LIMIT 1;
+select * from t1;
+id_param	nom_option	valid
+185	test	1
+drop table t1;

mysql-test/t/update.test

@@ -91,3 +91,20 @@ update t1 set b=100 where a=1 order by b desc limit 2;
 update t1 set a=a+10+b where a=1 order by b;
 select * from t1 order by a,b;
 drop table t1;
+
+#
+# Test with limit (Bug #393)
+#
+
+CREATE TABLE t1 (
+   `id_param` smallint(3) unsigned NOT NULL default '0',
+   `nom_option` char(40) NOT NULL default '',
+   `valid` tinyint(1) NOT NULL default '0',
+   KEY `id_param` (`id_param`,`nom_option`)
+ ) TYPE=MyISAM;
+
+INSERT INTO t1 (id_param,nom_option,valid) VALUES (185,'600x1200',1);
+
+UPDATE t1 SET nom_option='test' WHERE id_param=185 AND nom_option='600x1200' AND valid=1 LIMIT 1;
+select * from t1;
+drop table t1;

sql/sql_update.cc

@@ -231,9 +231,13 @@ int mysql_update(THD *thd,
 	    break; /* purecov: inspected */
 	  }
 	  if (!--limit && using_limit)
+	  {
+	    error= -1;
 	    break;
+	  }
 	}
       }
+      limit= tmp_limit;
       end_read_record(&info);
       /* Change select to use tempfile */
       if (select)