c3p0连接mysql

最近在做毕业设计，需要操作数据库，因为已经厌倦了以前的jdbc啊db啊巴拉巴拉的，所以学了一下这玩意一下是一些经验经供参考。

使用c3p0 JDBC连接池需要导入俩jar包

1.c3p0-0.9.1.2.jar

2.commons-dbutils-1.7.jar

然后在src下创建c3p0-config.xml文件，一下是xml文件内容

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<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>

<default-config>
       <property name="driverClass">com.mysql.jdbc.Driver</property>

<property name="jdbcUrl">jdbc:mysql://localhost/testdb?useUnicode=true&characterEncoding=utf-8</property>

<property name="user">username</property>

<property name="password">password</property>

<named-config name="mysql">
       <property name="acquireIncrement">50</property>
       <property name="initialPoolSize">100</property>
       <property name="minPoolSize">50</property>
       <property name="maxPoolSize">1000</property>

<property name="maxStatements">0</property>
       <property name="maxStatementsPerConnection">5</property>

<user-overrides user="master-of-the-universe">
           <property name="acquireIncrement">1</property>
           <property name="initialPoolSize">1</property>
           <property name="minPoolSize">1</property>
           <property name="maxPoolSize">5</property>
           <property name="maxStatementsPerConnection">50</property>
       </user-overrides>
   </named-config>

</c3p0-config>

然后再整一个C3P0Utils.java类,主要就是封装一些需要用到的方法：

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package util.c3p0;

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

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.sun.crypto.provider.RSACipher;

/**
*
* @author Chauncy
* 创建C3P0Utils类，定义获取getDataSource、定义获取connection、释放connection的方法
*/

public class C3p0Utils {
   // 这里有个优点，写好配置文件，想换数据库，简单
   static ComboPooledDataSource dataSource = null;
   static{
       dataSource = new ComboPooledDataSource();
   }

   public static DataSource getDataSource(){
       return dataSource;
   }
   /**
   * 获得数据库连接
   * @return Connection
   */
   public static Connection getConnection(){
       try {
           return dataSource.getConnection();
       } catch (SQLException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
           return null;
       }
   }

   public static void close(Connection connection,PreparedStatement pStatement,ResultSet resultSet){
       if(resultSet != null){
           try {
               resultSet.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       if(pStatement != null){
           try {
               pStatement.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       if(connection != null){
           try {
               connection.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
   }

//测试连接
   public static void main(String[] args) {
       Connection connection = getConnection();
       System.out.println(connection.getClass().getName());
       close(connection, null, null);
   }
}

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