c3p0的使用步驟

//1、導入c3p0的連個包，和mysql的驅動包

//2、配置c3p0.xml的配置文件

<c3p0-config>
 <!-- 使用默認的配置讀取連接池對象 -->
 <default-config>
 <!-- 連接參數 -->
 <property name="driverClass">com.mysql.jdbc.Driver</property>
 <property name="jdbcUrl">jdbc:mysql://localhost:3306/estore</property>
 <property name="user">root</property>
 <property name="password">123</property>
 
 <!-- 連接池參數 -->
 <property name="initialPoolSize">5</property>
 <property name="maxPoolSize">10</property>
 <property name="checkoutTimeout">3000</property>
 </default-config>

 <named-config name="otherc3p0"> 
 <!-- 連接參數 -->
 <property name="driverClass">com.mysql.jdbc.Driver</property>
 <property name="jdbcUrl">jdbc:mysql://localhost:3306/estore</property>
 <property name="user">root</property>
 <property name="password">123</property>
 
 <!-- 連接池參數 -->
 <property name="initialPoolSize">5</property>
 <property name="maxPoolSize">8</property>
 <property name="checkoutTimeout">1000</property>
 </named-config>
</c3p0-config>

//3、代碼測試
package cn.itcast.datasoure.c3p0;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

/**
 * @author newcityman
 * @date 2019/8/16 - 21:45
 */
public class C3P0Demo01 {
 public static void main(String[] args) {
 Connection conn = null;
 try {
// 1、創建數據庫連接池對象
 DataSource ds = new ComboPooledDataSource();
// 2、獲取連接對象
 conn= ds.getConnection();
 System.out.println(conn);
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
}