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本節作為主要講解Spring Data的環境搭建
JPA Spring Data :致力于減少數據訪問層(DAO)的開發量。開發者唯一要做的就是聲明持久層的接口,其他都交給Spring Data JPA來幫你完成!
使用Spring Data JPA進行持久層開發需要的四個步驟:
環境搭建
1.所需要的包
① 加入spring包
② 加入hibernate包
③ 加jpa的包
hibernate-entitymanager-4.3.11.Final.jar
④ 加c3p0的包
⑤ 加mysql的驅動
mysql-connector-java-5.1.7-bin.jar
⑥加入springData
⑦加入 slf4j-api-1.6.1.jar
2.Spring Bean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/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" /> <!--配置數據源 --> <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的實現 --> <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> <!-- 二級緩存相關 --> <!-- <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop> <prop key="net.sf.ehcache.configurationResourceName">ehcache-hibernate.xml</prop> --> <!-- 生成的數據表的列的映射策略 --> <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop> <!-- hibernate 基本屬性 --> <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:掃描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.數據庫持久類
Person.java
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") @Entity public 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
package com.ntjr.springdata; import org.springframework.data.repository.Repository; /** * * 1、實現Repository接口 * 2、通過注解的方式@RepositoryDefinition將一個bean定義為Repository接口 */ public interface PersonRepsitory extends Repository<Person, Integer> { // 根據lastName獲取對應的person Person getByLastName(String lastName); }
5.測試
SpringDataTest.java
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); } }
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