Merge pull request #746 from wdw1206/master

分表分库时insert into ...values (),(),....语句支持方便的改写sql，将一条sql拆分成多条发往不同的分库执行

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlInsertStatement.java

@@ -58,7 +58,11 @@ public class MySqlInsertStatement extends SQLInsertStatement {
         return valuesList;
     }
 
-    public boolean isLowPriority() {
+    public void setValuesList(List<ValuesClause> valuesList) {
+		this.valuesList = valuesList;
+	}
+
+	public boolean isLowPriority() {
         return lowPriority;
     }