| /******************************************************************************* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| *******************************************************************************/ |
| package org.ofbiz.entity.jdbc; |
| |
| import java.lang.reflect.Method; |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| import java.sql.Statement; |
| |
| |
| public class CursorResultSet extends AbstractCursorHandler { |
| |
| protected ResultSet rs; |
| protected Statement stmt; |
| protected String query; |
| |
| protected CursorResultSet(Statement stmt, String cursorName, int fetchSize) throws SQLException { |
| super(cursorName, fetchSize); |
| this.stmt = stmt; |
| query = "FETCH FORWARD " + fetchSize + " IN " + cursorName; |
| System.err.println("executing page fetch(1)"); |
| rs = stmt.executeQuery(query); |
| } |
| |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| if ("close".equals(method.getName())) { |
| close(); |
| return null; |
| } else if ("next".equals(method.getName())) { |
| return next() ? Boolean.TRUE : Boolean.FALSE; |
| } |
| return super.invoke(rs, proxy, method, args); |
| } |
| |
| protected boolean next() throws SQLException { |
| if (rs.next()) return true; |
| System.err.println("executing page fetch(2)"); |
| rs = stmt.executeQuery(query); |
| return rs.next(); |
| } |
| |
| protected void close() throws SQLException { |
| stmt.executeUpdate("CLOSE " + cursorName); |
| rs.close(); |
| } |
| |
| public static ResultSet newCursorResultSet(Statement stmt, String cursorName, int fetchSize) throws SQLException, Exception { |
| return newHandler(new CursorResultSet(stmt, cursorName, fetchSize), ResultSet.class); |
| } |
| } |