本节作为主要讲解Spring Data的环境搭建
JPA Spring Data :致力于减少数据访问层(DAO)的开发量。开发者唯一要做的就是声明持久层的接口，其他都交给Spring Data JPA来帮你完成！
使用Spring Data JPA进行持久层开发需要的四个步骤：
- 配置Spring 整合 JPA
- 在Spring配置文件中配置Spring Data,让Spring 为声明的接口创建代理对象。配置了<jpa:repositories>后，Spring 初始化容器时将会扫描base-package 指定的包目录及其子目录，为继承Repository或其子接口的接口创建代理对象，并将代理对象注册为SpringBean，业务层便可以通过Spring的自动封装的特性来直接使用该对象。
- 声明持久层的接口，该接口继承Repository。Repository是一个标记型接口，它不包含任何方法，如必要，Spring Data 可实现Repository其他子接口，其中定义了一些常用的增删改查，以及分页相关的方法。
- 在接口中声明需要的方法。Spring Data将根据给定的策略，来为其生成实现代码。
环境搭建
1.所需要的包
① 加入spring包
- spring-aop-4.3.8.RELEASE.jar
- spring-aspects-4.3.8.RELEASE.jar
- spring-beans-4.3.8.RELEASE.jar
- spring-context-4.3.8.RELEASE.jar
- spring-core-4.3.8.RELEASE.jar
- spring-expression-4.3.8.RELEASE.jar
- spring-jdbc-4.3.8.RELEASE.jar
- spring-orm-4.3.8.RELEASE.jar
- spring-tx-4.3.8.RELEASE.jar
- spring-web-4.3.8.RELEASE.jar
- spring-webmvc-4.3.8.RELEASE.jar
- com.springsource.net.sf.cglib-2.2.0.jar
- com.springsource.org.aopalliance-1.0.0.jar
- com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
- commons-logging-1.1.1.jar
② 加入hibernate包
- antlr-2.7.7.jar
- dom4j-1.6.1.jar
- hibernate-commons-annotations-4.0.5.Final.jar
- hibernate-core-4.3.11.Final.jar
- hibernate-jpa-2.1-api-1.0.0.Final.jar
- jandex-1.1.0.Final.jar
- javassist-3.18.1-GA.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
③ 加jpa的包
hibernate-entitymanager-4.3.11.Final.jar
④ 加c3p0的包
- c3p0-0.9.2.1.jar
- hibernate-c3p0-4.3.11.Final.jar
- mchange-commons-java-0.2.3.4.jar
⑤ 加mysql的驱动
mysql-connector-java-5.1.7-bin.jar
⑥加入springData
- spring-data-commons-1.6.2.RELEASE.jar
- spring-data-jpa-1.4.2.RELEASE.jar
⑦加入 slf4j-api-1.6.1.jar
2.Spring Bean配置文件
applicationContext.xml
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<?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/context http://www.springframework.org/schema/context/spring-context-4.3.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-4.3.xsd"> <context:property-placeholder location="classpath:db.properties" /> <!--配置数据源 --> <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="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> </bean> <!--配置JPA的entityManagerFactory --> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"></property> <!-- 配置JPA的实现 --> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean> </property> <property name="packagesToScan" value="com.ntjr.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> <!--配置事物管理器 --> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"></property> </bean> <!-- 配置支持注解的事物 --> <tx:annotation-driven transaction-manager="transactionManager" /> <!--配置springData --> <!--base-package:扫描Repository Bean所在的package --> <jpa:repositories base-package="com.ntjr.springdata" entity-manager-factory-ref="entityManagerFactory" transaction-manager-ref="transactionManager"> </jpa:repositories> </beans>applicationContext.xml |
3.数据库持久类
Person.java
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package com.ntjr.springdata; import java.util.Date;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.Table;@Table(name = "JPA_PERSONS")@Entitypublic class Person { private Integer id; private String lastName; private String email; private Date birth; @GeneratedValue @Id public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } @Column(name = "LAST_NAME") public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } @Override public String toString() { return "Person [id=" + id + ", lastName=" + lastName + ", email=" + email + ", birth=" + birth + "]"; }} |
4.DAO
PersonRepository.java
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package com.ntjr.springdata;import org.springframework.data.repository.Repository; /** * * 1、实现Repository接口 * 2、通过注解的方式@RepositoryDefinition将一个bean定义为Repository接口 */public interface PersonRepsitory extends Repository<Person, Integer> { // 根据lastName获取对应的person Person getByLastName(String lastName);} |
5.测试
SpringDataTest.java
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package com.ntjr.springdata.test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.ntjr.springdata.Person;import com.ntjr.springdata.PersonRepsitory;public class SpringDataTest { private ApplicationContext ctx = null; { ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); } @Test public void getPersonForLastName() { PersonRepsitory personRepsitory = ctx.getBean(PersonRepsitory.class); Person person = personRepsitory.getByLastName("AA"); System.out.println(person); }} |
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：https://www.cnblogs.com/zhaobingqing/p/6854322.html
