SpringData环境搭建代码编写

首先我们在前面的两节已经了解了SpringData是干什么用的？那我们从这节开始我们就开始编码测试SpringData.

1:首先我们从配置文件开始，我们首先需要写一个连接数据库的文件db.properties:

jdbc.user=root
jdbc.password=root
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc\:mysql\:///jpa

2:因为SpringData 是Spring的一个子项目，我们需要配置Spring的配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> 
<!-- 配置自动扫描的包 -->
<context:component-scan base-package="com.fxr.springdata"></context:component-scan>

<!-- 1. 配置数据源 -->
<context:property-placeholder location="classpath:db.properties"/>

<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>

<!-- 配置其他属性 -->
</bean>

<!-- 2. 配置 JPA 的 EntityManagerFactory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
</property>
<property name="packagesToScan" value="com.fxr.springdata"></property>
<property name="jpaProperties">
<props>
<!-- 二级缓存相关 -->
<!--
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
<prop key="net.sf.ehcache.configurationResourceName">ehcache-hibernate.xml</prop>
-->
<!-- 生成的数据表的列的映射策略 -->
<prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
<!-- hibernate 基本属性 -->
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>

<!-- 3. 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"></property>
</bean>

<!-- 4. 配置支持注解的事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>

<!-- 5. 配置 SpringData -->
<!-- 加入  jpa 的命名空间 -->
<!-- base-package: 扫描 Repository Bean 所在的 package -->
<jpa:repositories base-package="com.fxr.springdata"
entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>

</beans>

3:首先我们需要测试配置的文件对不对，我们测试配置的数据源对不对

package com.fxr.test;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.fxr.springdata.PersonRepsotory;

public class SpringDataTest {

private ApplicationContext ctx = null;
private PersonRepsotory personRepsotory;

{
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
personRepsotory = ctx.getBean(PersonRepsotory.class);
}

//测试配置的数据源成功没有成功
@Test
public void testDataSource() throws SQLException{
DataSource dataSource = ctx.getBean(DataSource.class);
System.out.println(dataSource.getConnection());
}

}

4：如果运行过给我们自动创建了数据表，就说明我们的数据源已经配置成功。