Spring mvc中使用Spring Data Jpa 连接Mysql数据库

首先说明以下，Spring Data Jpa的jar包已经不提供直接下载了，要用maven配置依赖项进行下载，可以在gitHub上下载一个名字叫es的项目里面配置了一个完整的Spring环境

，

项目需要若干jar

主要的有

aopalliance-1.0.jar

spring-data-commons-1.6.1.RELEASE.jar

spring-data-jpa-1.4.1.RELEASE.jar

jandex-1.1.0.Final.jar

jboss-logging-3.1.3.GA.jar

jboss-logging-annotations-1.2.0.Beta1.jar

jboss-transaction-api_1.2_spec-1.0.0.Final.jar

首先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:aop="http://www.springframework.org/schema/aop"

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

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

xmlns:cache="http://www.springframework.org/schema/cache"

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-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
<context:annotation-config />

<context:component-scan base-package="htm">

<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>

</context:component-scan>

<!-- 定义实体管理器工厂（value就是） -->

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">

<property name="persistenceUnitName" value="asd"/>

</bean>

<!-- 配置事务管理器 -->

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">

<property name="entityManagerFactory" ref="entityManagerFactory" />

</bean>

<!-- 启用 annotation事务-->

<tx:annotation-driven transaction-manager="transactionManager"/>

<!-- 配置Spring Data JPA扫描目录(根据自己的目录情况定义，就是 extends CrudRepository<HtmEntity,Integer>那个类所在的包，切记)-->

<jpa:repositories base-package="htm"/>

</beans>

之后，在源包目录src下建目录META-INF，在里面建持久化配置文件persistence.xml,内容如下

<?xml version="1.0" encoding="UTF-8"?>

<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="asd" transaction-type="RESOURCE_LOCAL">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<exclude-unlisted-classes>false</exclude-unlisted-classes>

<properties>

<property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>

<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/mysql?zeroDateTimeBehavior=convertToNull"/>

<property name="javax.persistence.jdbc.password" value="root"/>

<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>

<property name="javax.persistence.jdbc.user" value="root"/>

<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>

</properties>

</persistence-unit>

</persistence>

新建接口UserRepository

import org.springframework.data.repository.CrudRepository;

/**

*

* @author root

*/

public interface UserRepository extends CrudRepository<HtmEntity,Integer>{

}

注意，不需要任何实现，数据库操作已经被封装其中，这个接口所在的包必须是applicationContextg.xml中的

<!-- 配置Spring Data JPA扫描目录(根据自己的目录情况定义，就是 extends CrudRepository<HtmEntity,Integer>那个类所在的包，切记)-->

<jpa:repositories base-package="htm"/>

UserRepository这个接口封装了表的一般操作，增删改查都可以，基本就这么多了。