|NO.Z.00098|——————————|BigDataEnd|——|Java&MySQL.数据库连接池和DBUtils.V07|——|MySQL.v07|C3P0连接池工具类编写|

一、编写C3P0工具类

### --- C3P0提供的核心工具类, ComboPooledDataSource , 如果想使用连接池,就必须创建该类的对象

——>        new ComboPooledDataSource(); 使用 默认配置
——>        new ComboPooledDataSource("mysql"); 使用命名配置    

public class C3P0Utils {
    //1.创建连接池对象 C3P0对DataSource接口的实现类
    //使用的配置是 配置文件中的默认配置
    //public static ComboPooledDataSource dataSource = new ComboPooledDataSource();

    //使用指定的配置
    public static ComboPooledDataSource dataSource = new ComboPooledDataSource("mysql");

    //获取连接的方法
    public static Connection getConnection() throws SQLException {
     return dataSource.getConnection();
    }

    //释放资源
    public static void close(Connection con, Statement statement){
       
        if(con != null && statement != null){
            try {
                statement.close();
                //归还连接
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }     
        
     public static void close(Connection con, Statement statement, ResultSet resultSet){
        if(con != null && statement != null && resultSet != null){
            try {
                resultSet.close();
                statement.close();
                //归还连接
                con.close();
             } catch (SQLException e) {
                 e.printStackTrace();
            }
        }
    }
}       

二、sql语句

package com.yanqi.utils;

        import com.mchange.v2.c3p0.ComboPooledDataSource;
        import org.apache.commons.dbutils.QueryRunner;

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

public class C3P0Utils {

    //1.创建连接池对象 C3P0对DataSource接口的实现类
    //使用的配置是 配置文件中的默认配置
    //public static ComboPooledDataSource dataSource = new ComboPooledDataSource();

    //使用指定的配置
    public static ComboPooledDataSource dataSource = new ComboPooledDataSource("mysql");

    //获取连接的方法
    public static Connection getConnection() throws SQLException {

        return dataSource.getConnection();
    }

    //释放资源
    public static void close(Connection con, Statement statement){


        if(con != null && statement != null){
            try {
                statement.close();
                //归还连接
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

    public static void close(Connection con, Statement statement, ResultSet resultSet){

        if(con != null && statement != null && resultSet != null){
            try {
                resultSet.close();
                statement.close();
                //归还连接
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
}

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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