c3p0連接池

需要的架包
1.mysql-connector-java-5.1.7-bin.jar
2.c3p0-0.9.2.1.jar
3.mchange-commons-java-0.2.3.4.jar
c3p0-config.xml配置文件
<!--?
*這里為了演示只配置了最基本的，和普通連接數(shù)據(jù)庫(kù)類(lèi)似
*這里的name屬性名字不能自己杜撰
*這里的named-config的name屬性一定要寫(xiě)，不然找不到配置
*如果出現(xiàn)java.sql.SQLException:?
Connections could not be acquired from the underlying database!
錯(cuò)誤，通常是c3p0-config.xml文件配置錯(cuò)誤，檢查賬號(hào)，密碼，驅(qū)動(dòng)是否正確

?-->

<c3p0-config><named-config name="tang"><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost:3306/tang</property><property name="user">root</property><property name="password">jarrem</property><property name="maxActive">20</property><property name="maxIdle">10</property><property name="minIdle">1</property><property name="initialSize">2</property></named-config></c3p0-config>

?

java代碼

package com.tang.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; public class c3p0Test {private Connection connection=null;private DataSource ds=null;public c3p0Test(){//創(chuàng)建數(shù)據(jù)源，通過(guò)named-config的name屬性加載xml配置文件ds=new ComboPooledDataSource("tang");try {//獲取Connection對(duì)象connection = ds.getConnection();PreparedStatement statement = connection.prepareStatement("select * from student;");ResultSet result = statement.executeQuery();while(result.next()){System.out.println(result.getString(5)+" "+result.getString(3));}} catch (SQLException e) {e.printStackTrace();}}public static void main(String args[]){new c3p0Test();} }

?

轉(zhuǎn)載于:https://www.cnblogs.com/jarrem/p/5910824.html

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