C3P0Util

1.c3p0-config.xml(放在src目录下)

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <default-config>
        <property name="user">root</property>
        <property name="password">abc</property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql:///bookStore</property>
    </default-config> 
</c3p0-config> 

2.C3P0Util

 

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class C3P0Util {
    //得到一个数据源
    private static DataSource dataSource = new ComboPooledDataSource();
    
    //从数据源中得到一个连接对象
    public static Connection getConnection(){
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            throw new RuntimeException("服务器错误");
        }
    }
    
    public static void release(Connection conn,Statement stmt,ResultSet rs){
        //关闭资源
                if(rs!=null){
                    try {
                        rs.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    rs = null;
                }
                if(stmt!=null){
                    try {
                        stmt.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    stmt = null;
                }
                if(conn!=null){
                    try {
                        conn.close();//关闭
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    conn = null;
                }
    }
    
}