Update JSqlParserCC.jj

Add support for DB2 Updates with Select clause

Author: CeeKayGit

src/main/javacc/net/sf/jsqlparser/parser/JSqlParserCC.jj

@@ -311,12 +311,27 @@ Update Update():
 	Expression value = null;
 	FromItem fromItem = null;
 	List<Join> joins = null;
+	Select select = null;
+	boolean useColumnsBrackets = false;
 }
 {
     <K_UPDATE> table=TableWithAlias() { tables.add(table); } 
           ("," table=TableWithAlias() { tables.add(table); } )*
-    <K_SET> tableColumn=Column() "=" value=SimpleExpression() { columns.add(tableColumn); expList.add(value); }
-		  ("," tableColumn=Column() "=" value=SimpleExpression()  { columns.add(tableColumn); expList.add(value); } )*
+    <K_SET> 
+    (
+	tableColumn=Column() "=" value=SimpleExpression() { columns.add(tableColumn); expList.add(value); }
+		("," tableColumn=Column() "=" value=SimpleExpression() { columns.add(tableColumn); expList.add(value); } )*
+
+	|
+
+	[LOOKAHEAD(2) "(" { useColumnsBrackets = true; }] tableColumn=Column() { columns.add(tableColumn); } ("," tableColumn=Column() { columns.add(tableColumn); } )* [ ")" ] "="
+		"("
+		(
+			{ update.setUseSelect(true); }
+			select = Select()
+		)
+		")"
+   )
 
    [ <K_FROM>
       fromItem=FromItem()
@@ -329,6 +344,8 @@ Update Update():
    		update.setTables(tables);
 		update.setFromItem(fromItem);
 		update.setJoins(joins);
+		update.setSelect(select);
+		update.setUseColumnsBrackets(useColumnsBrackets);
 		return update;
    }
 }
@@ -2369,4 +2386,4 @@ Alter Alter():
 		alter.setDataType(dataType);
 		return alter;
 	}
-}
+}