fix multipleResultsetSets bug

fix   multipleResultsetSets  bug,when ((stmt.getMoreResults() or stmt.getUpdateCount()!=-1)  and  stmt.getResultSet()==null),will stop check the succedent resultsets and the succedent  resultsets will be lost.

Author: happysearch

src/main/java/org/apache/ibatis/executor/resultset/DefaultResultSetHandler.java

@@ -253,9 +253,13 @@ private ResultSetWrapper getNextResultSet(Statement stmt) throws SQLException {
     try {
       if (stmt.getConnection().getMetaData().supportsMultipleResultSets()) {
         // Crazy Standard JDBC way of determining if there are more results
-        if (!((!stmt.getMoreResults()) && (stmt.getUpdateCount() == -1))) {
+        if (stmt.getMoreResults() || stmt.getUpdateCount() != -1) {
           ResultSet rs = stmt.getResultSet();
-          return rs != null ? new ResultSetWrapper(rs, configuration) : null;
+          if (rs == null) {
+            return getNextResultSet(stmt);
+          } else {
+            return new ResultSetWrapper(rs, configuration);
+          }
         }
       }
     } catch (Exception e) {