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:
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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 ));
}
}
}
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第一种:使用spring自带的DriverManagerDataSource 配置文件如下:
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<? xml version = "1.0" encoding = "UTF-8" ?>
< beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:aop = "http://www.springframework.org/schema/aop"
xmlns:tx = "http://www.springframework.org/schema/tx"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:p = "http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<!-- 使用XML Schema的p名称空间配置 -->
< bean name = "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName = "com.mysql.jdbc.Driver"
p:url = "jdbc:mysql://localhost:3306/test"
p:username = "root"
p:password = "123456" / >
<!-- 采用property的普通配置 相比之下有点麻烦,但是效果是一样的哦,-->
<!--
<bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
-->
</ beans >
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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:
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<? xml version = "1.0" encoding = "UTF-8" ?>
< beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:aop = "http://www.springframework.org/schema/aop"
xmlns:tx = "http://www.springframework.org/schema/tx"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:p = "http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<!-- 使用XML Schema的p名称空间配置 -->
< bean name = "dataSource" class = "com.mchange.v2.c3p0.ComboPooledDataSource"
p:driverClass = "com.mysql.jdbc.Driver"
p:jdbcUrl = "jdbc:mysql://localhost:3306/test"
p:user = "root"
p:password = "123456" >
</ bean >
<!-- 采用property的普通配置 相比之下有点麻烦,但是效果是一样的哦 建议使用上面的-->
<!-- <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test" />
<property name="user" value="root" />
<property name="password" value="123456" />
</bean>
-->
</ beans >
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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:
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<? xml version = "1.0" encoding = "UTF-8" ?>
< beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:aop = "http://www.springframework.org/schema/aop"
xmlns:tx = "http://www.springframework.org/schema/tx"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:p = "http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<!-- 使用XML Schema的p名称空间配置 -->
< bean name = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource"
p:driverClassName = "com.mysql.jdbc.Driver"
p:url = "jdbc:mysql://localhost:3306/test"
p:username = "root"
p:password = "123456" >
</ bean >
<!-- 采用property的普通配置 相比之下有点麻烦,但是效果是一样的哦 建议使用上面的-->
<!-- <bean name="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
-->
</ beans >
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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
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< bean id = "sessionFactory" class = "org.springframework.orm.hibernate3.LocalSessionFactoryBean" >
< property name = "configLocations" >
< list >
< value >classpath:com/config/hibernate.cfg.xml</ value >
</ list >
</ property >
< property name = "mappingLocations" >
<!-- 所有的实体类映射文件 -->
< list >
< value >classpath:com/hibernate/*.hbm.xml</ value >
</ list >
</ property >
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/xiohao/p/3663619.html