JDBC事务处理和保存点

/**
	 * savepoint保存点使用
	 * savepoint = con.setSavepoint();
	 */
	 /**
 * 
 * 事务处理 con.setAutoCommit(false);
 *  con.commit(); 
 * 	con.rollback(savepoint);回滚到保存点
 *	con.commit();
 *distributed transaction JTA
 *一个分布式事务（distributed transaction）
 *包括一个事务管理器（transaction manager）和一个或多个资源管理器(resource manager）。
 */
 
 package com.study.test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import org.junit.Test;

import com.study.dao.AddressService;
import com.study.dao.DaoFactory;
import com.study.dao.domain.Address;
import com.study.exceptions.DataAccessException;
import com.study.utils.JdbcUtils;

/**
 * 
 * 事务处理 con.setAutoCommit(false);
 *  con.commit(); 
 * 	con.rollback(savepoint);回滚到保存点
 *	con.commit();
 *distributed transaction JTA
 *一个分布式事务（distributed transaction）
 *包括一个事务管理器（transaction manager）和一个或多个资源管理器(resource manager）。
 */
public class TestTransaction {

	@Test
	public void post() {

		Connection con = null;
		Statement st = null;
		try {
			con = JdbcUtils.getConnection();
			con.setAutoCommit(false);
			st = con.createStatement();
			st.addBatch("update address set money=money-100 where addressid=10");
			st.addBatch("update address set money=money+100 where addressid=11");
			st.executeBatch();
			con.commit();

		} catch (SQLException e) {
			try {
				if (con != null)
					con.rollback();
			} catch (SQLException s) {
				throw new DataAccessException(s.getMessage());
			}

		} finally {
			JdbcUtils.free(null, st, con);
		}

	}

	/**
	 * savepoint保存点使用
	 * savepoint = con.setSavepoint();
	 */
	@SuppressWarnings("unused")
	@Test
	public void savePoint() {

		Connection con = null;
		Statement st = null;
		Savepoint savepoint = null;
		try {
			con = JdbcUtils.getConnection();
			con.setAutoCommit(false);
			st = con.createStatement();
			st.executeUpdate("update address set money=money+100 where addressid=10");
			savepoint = con.setSavepoint();	
			st.executeUpdate("update address set money=money+50 where addressid=11");
			st.executeUpdate("update address set money=money+50 where addressid=12");
			con.commit();

		}  catch (SQLException e) {

			try {
				if (con != null&&savepoint!=null){
					con.rollback(savepoint);//回滚到保存点
				    con.commit();
				}			
			} catch (SQLException s) {
				throw new DataAccessException(e.getMessage());
			}

		
		} finally {
			JdbcUtils.free(null, st, con);
		}

	}

}