jdbc 以及 事务的java类编写

package com.gaosheng.utils;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JdbcUtil {
private static DataSource datasource = new ComboPooledDataSource(); //连接池对象
static ThreadLocal<Connection> t = new ThreadLocal();
private static Connection conn = null; //定义一个事务的专用连接

//获得连接池对象
public static DataSource getDatasource(){
return datasource;
}

//获得连接对象
public static Connection getConnection() throws SQLException{
conn = t.get();
if(conn == null) {
return datasource.getConnection();
}
return conn;
}

//开启事务方法
public static void beginTranscation() throws SQLException{
conn = t.get();
if(conn != null) {
throw new SQLException("事务已经开启，在没有结束当前事务时，不能再开启事务！");
}

conn = datasource.getConnection();
conn.setAutoCommit(false);
t.set(conn);
}

//提交事务的方法
public static void commitTransaction() throws SQLException{
conn = t.get();
if(conn == null) {
throw new SQLException("当前没有事务，所以不能提交事务！");
}
conn.commit();
conn.close();
//conn = null;
t.remove();
}

//回滚事物的方法
public static void rollbackTransaction() throws SQLException{
if(conn == null) {
throw new SQLException("当前没有事务，所以不能回滚事务！");
}
conn.rollback();
conn.close();
//conn = null;
t.remove();
}
}

package com.gaosheng.utils;

import java.sql.Connection;
import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;

public class TxQueryRunner extends QueryRunner{

@Override
public int[] batch(String sql, Object[][] params) throws SQLException {
Connection conn = JdbcUtil.getConnection();
return super.batch(conn, sql, params);
}

@Override
public <T> T query(String sql, Object param, ResultSetHandler<T> rsh) throws SQLException {
Connection conn = JdbcUtil.getConnection();
return super.query(conn,sql, param, rsh);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#query(java.lang.String, java.lang.Object[], org.apache.commons.dbutils.ResultSetHandler)
*/
@Override
public <T> T query(String sql, Object[] params, ResultSetHandler<T> rsh) throws SQLException {
Connection conn = JdbcUtil.getConnection();
return super.query(conn,sql, params, rsh);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#query(java.lang.String, org.apache.commons.dbutils.ResultSetHandler, java.lang.Object[])
*/
@Override
public <T> T query(String sql, ResultSetHandler<T> rsh, Object... params) throws SQLException {
// TODO Auto-generated method stub
return super.query(sql, rsh, params);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#query(java.lang.String, org.apache.commons.dbutils.ResultSetHandler)
*/
@Override
public <T> T query(String sql, ResultSetHandler<T> rsh) throws SQLException {
// TODO Auto-generated method stub
return super.query(sql, rsh);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#update(java.lang.String)
*/
@Override
public int update(String sql) throws SQLException {
// TODO Auto-generated method stub
return super.update(sql);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#update(java.lang.String, java.lang.Object)
*/
@Override
public int update(String sql, Object param) throws SQLException {
// TODO Auto-generated method stub
return super.update(sql, param);
}

/* (non-Javadoc)
* @see org.apache.commons.dbutils.QueryRunner#update(java.lang.String, java.lang.Object[])
*/
@Override
public int update(String sql, Object... params) throws SQLException {
Connection conn = JdbcUtil.getConnection();
return super.update(conn,sql, params);
}


}