详解Spring连接数据库的几种常用的方式

详解Spring连接数据库的几种常用的方式

本文简单的讲解使用Spring连接数据库的几种常用方法:

测试主类为:

package myspring2;

import java.sql.*;

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MySpringTest {

public static void main(String args[]) throws Exception{

ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

DataSource dataSource=ctx.getBean("dataSource",DataSource.class);

String sql="select * from user_inf";

Connection connection=dataSource.getConnection();

Statement stm=connection.createStatement();

ResultSet rs=stm.executeQuery(sql);

while(rs.next())

{ System.out.println("用户名为:");

System.out.println(rs.getString(2));

}

}

}

第一种：使用spring自带的DriverManagerDataSource   配置文件如下：

xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" / >

xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" / >

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" / >

第二种：C3P0数据源。

需要使c3p0的核心jar包，我使用的是c3p0-0.9.1.jar,比较稳定，推荐使用。一般在下载hibernate的时候都会自带一个： 我在hibernate-release-4.3.0.Final\lib\optional\c3p0路径下找到的。

配置文件中如下：

xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClass="com.mysql.jdbc.Driver"

p:jdbcUrl="jdbc:mysql://localhost:3306/test"

p:user="root"

p:password="123456" >

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xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClass="com.mysql.jdbc.Driver"

p:jdbcUrl="jdbc:mysql://localhost:3306/test"

p:user="root"

p:password="123456" >

p:driverClass="com.mysql.jdbc.Driver"

p:jdbcUrl="jdbc:mysql://localhost:3306/test"

p:user="root"

p:password="123456" >

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第三种:

使用apache的dbcp插件连接数据库 需要下载的jar包：commons-dbcp.jar，commons-pool.jar,commons-collection.jar

spring的配置文件中如下：

xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" >

xmlns:aop="http://springframework.org/schema/aop"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="

http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/tx

http://springframework.org/schema/tx/spring-tx-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop-3.0.xsd">

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" >

p:driverClassName="com.mysql.jdbc.Driver"

p:url="jdbc:mysql://localhost:3306/test"

p:username="root"

p:password="123456" >

第四种：

使用hibernate数据源   需要hiberante核心jar包，我使用的hibernate1的版本是hibernate-release-4.3.0.Final

目前三大框架较流行，spring一般与hiberante做搭档，数据库连接方式写在hiberante的配置文件中，在spring管理hibernate中的配置文件

中，直接读取hibernate核心配置文件即可。在使用hibernate连接数据库的时候需要读取hibernate.cfg.xml的配置文件和相应的实体类，

读者可参照下面的自己配置一下

classpath:com/config/hibernate.cfg.xml

classpath:com/hibernate/*.hbm.xml

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