Home  >  Article  >  Database  >  C3P0数据库连接池使用

C3P0数据库连接池使用

WBOY
WBOYOriginal
2016-06-07 16:02:241601browse

C3P0数据库连接池使用 1、拷贝jar包:c3p0-0.9.1.2.jar c3p0-0.9.1.2-jdk1.3.jar c3p0-oracle-thin-extras-0.9.1.2.jar(oracle需要) 2、书写配制文件放在src目录下:c3p0-config.xml(名字只能是这个) 3、类C3P0Util c3p0-config.xml 内容: ?xml version

C3P0数据库连接池使用

1、拷贝jar包:c3p0-0.9.1.2.jar c3p0-0.9.1.2-jdk1.3.jar c3p0-oracle-thin-extras-0.9.1.2.jar(oracle需要)

2、书写配制文件放在src目录下:c3p0-config.xml(名字只能是这个)

3、类C3P0Util

c3p0-config.xml 内容:

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
	<!-- This is default config! -->
	<default-config>
		<property name="initialPoolSize">10</property>
		<property name="maxIdleTime">30</property>
		<property name="maxPoolSize">100</property>
		<property name="minPoolSize">10</property>
		<property name="maxStatements">200</property>
	</default-config>

	<!-- This is my config for mysql-->
	<named-config name="mysql">
		<property name="driverClass">com.mysql.jdbc.Driver</property>
		<property name="jdbcUrl">jdbc:mysql://localhost:3306/test</property>
		<property name="user">root</property>
		<property name="password"></property>
		<property name="initialPoolSize">10</property>
		<property name="maxIdleTime">30</property>
		<property name="maxPoolSize">100</property>
		<property name="minPoolSize">10</property>
		<property name="maxStatements">200</property>
	</named-config>
	
	
	<!-- This is my config for oracle -->
	<named-config name="oracle">
		<property name="driverClass">oracle.jdbc.driver.OracleDriver</property>
		<property name="jdbcUrl">jdbc:oracle:thin:@localhost:1521:orcl</property>
		<property name="user">scott</property>
		<property name="password">liang</property>
		<property name="initialPoolSize">10</property>
		<property name="maxIdleTime">30</property>
		<property name="maxPoolSize">100</property>
		<property name="minPoolSize">10</property>
		<property name="maxStatements">200</property>
	</named-config>
</c3p0-config>
C3P0Util: 
package com.liang.util;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

import com.mchange.v2.c3p0.ComboPooledDataSource;
/**
 * 数据库工具类
 * @author liang
 *
 */
public class C3P0Util {
	static ComboPooledDataSource cpds=null;
	static{
		//这里有个优点,写好配置文件,想换数据库,简单
		//cpds = new ComboPooledDataSource("oracle");//这是oracle数据库
		cpds = new ComboPooledDataSource("mysql");//这是mysql数据库
	}
	/**
	 * 获得数据库连接
	 * @return   Connection
	 */
	public static Connection getConnection(){
		try {
			return cpds.getConnection();
		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
	}
	
	/**
	 * 数据库关闭操作
	 * @param conn  
	 * @param st    
	 * @param pst
	 * @param rs
	 */
	public static void close(Connection conn,PreparedStatement pst,ResultSet rs){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(pst!=null){
			try {
				pst.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		if(conn!=null){
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 * 测试DBUtil类
	 * @param args
	 */
	public static void main(String[] args) {
		Connection conn=getConnection();
		System.out.println(conn.getClass().getName());
		close(conn,null,null);
	}
}
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn