【Spring Date JPA】四、入门案例_小言_互联网的博客

【Spring Date JPA】四、入门案例

2020-04-11 19:51 278人阅读评论(0)

文章目录

1. 什么是 spring date jpa
2. Spring Data JPA的快速入门

2.1 pom.xml
2.2 applicationContext.xml
2.3使用JPA注解配置映射实体类
2.4 编写符合Spring Data JPA规范的Dao层接口
2.5 编写测试类

1. 什么是 spring date jpa

JPA是一套规范，内部是有接口和抽象类组成的。hibernate是一套成熟的ORM框架，而且Hibernate实现了JPA规范，所以也可以称hibernate为JPA的一种实现方式，我们使用JPA的API编程，意味着站在更高的角度上看待问题（面向接口编程）

Spring Data JPA是Spring提供的一套对JPA操作更加高级的封装，是在JPA规范下的专门用来进行数据持久化的解决方案。

2. Spring Data JPA的快速入门

2.1 pom.xml

 <properties>
        <spring.version>4.2.4.RELEASE</spring.version>
        <hibernate.version>5.0.7.Final</hibernate.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <c3p0.version>0.9.1.2</c3p0.version>
        <mysql.version>5.1.6</mysql.version>
    </properties>

    <dependencies>
        <!-- junit单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.9</version>
            <scope>test</scope>
        </dependency>

        <!-- spring beg -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- spring end -->

        <!-- hibernate beg -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <!-- hibernate end -->

        <!-- c3p0 beg -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>${c3p0.version}</version>
        </dependency>
        <!-- c3p0 end -->

        <!-- log end -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.9.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>

        <!-- el beg 使用spring data jpa 必须引入 -->
        <dependency>
            <groupId>javax.el</groupId>
            <artifactId>javax.el-api</artifactId>
            <version>2.2.4</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.el</artifactId>
            <version>2.2.4</version>
        </dependency>
        <!-- el end -->
    </dependencies>

2.2 applicationContext.xml

整合Spring Data JPA与Spring

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
		http://www.springframework.org/schema/data/jpa
		http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

    <!-- 1.dataSource 配置数据库连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssh" />
        <property name="user" value="root" />
        <property name="password" value="root" />
    </bean>

    <!-- 2.配置entityManagerFactory -->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
<!--        配置扫描的包,也就是实体类所在的包-->
        <property name="packagesToScan" value="cn.itcast.domain" />
<!--        配置jpa的实现厂家-->
        <property name="persistenceProvider">
            <bean class="org.hibernate.jpa.HibernatePersistenceProvider" />
        </property>
        <!--JPA的供应商适配器-->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<!--                是否自动创建数据库-->
                <property name="generateDdl" value="false" />
<!--                指定数据库类型-->
                <property name="database" value="MYSQL" />
<!--                数据库方言，支持的特有语法-->
                <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
<!--                是否显示sql语句-->
                <property name="showSql" value="true" />
            </bean>
        </property>
<!--        jpa的方言：高级特性-->
        <property name="jpaDialect">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
        </property>
    </bean>


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

    <!-- 整合spring data jpa-->
    <jpa:repositories base-package="cn.itcast.dao"
                      transaction-manager-ref="transactionManager"
                      entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>

    <!-- 4.txAdvice-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!-- 5.aop-->
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* cn.itcast.service.*.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut" />
    </aop:config>

    <context:component-scan base-package="cn.itcast"></context:component-scan>

    <!--组装其它 配置文件-->

</beans>

2.3使用JPA注解配置映射实体类

package cn.itcast.domain;

import javax.persistence.*;

/**
 *		* 所有的注解都是使用JPA的规范提供的注解，
 *		* 所以在导入注解包的时候，一定要导入javax.persistence下的
 */
@Entity //声明实体类
@Table(name="cst_customer") //建立实体类和表的映射关系
public class Customer {

    @Id//声明当前私有属性为主键
    @GeneratedValue(strategy = GenerationType.IDENTITY) //配置主键的生成策略
    @Column(name = "cust_id") //指定和表中cust_id字段的映射关系
    private Long custId;

    @Column(name = "cust_name") //指定和表中cust_name字段的映射关系
    private String custName;

    @Column(name = "cust_source")//指定和表中cust_source字段的映射关系
    private String custSource;

    @Column(name = "cust_industry")//指定和表中cust_industry字段的映射关系
    private String custIndustry;

    @Column(name = "cust_level")//指定和表中cust_level字段的映射关系
    private String custLevel;

    @Column(name = "cust_address")//指定和表中cust_address字段的映射关系
    private String custAddress;

    @Column(name = "cust_phone")//指定和表中cust_phone字段的映射关系
    private String custPhone;



}

2.4 编写符合Spring Data JPA规范的Dao层接口

/**
 * JpaRepository<实体类类型，主键类型>：用来完成基本CRUD操作
 * JpaSpecificationExecutor<实体类类型>：用于复杂查询（分页等查询操作）
 */

public interface CustomerDao extends JpaRepository<Customer,Long>, JpaSpecificationExecutor<Customer> {
}

2.5 编写测试类


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class CustomerTest {

    @Autowired
    private CustomerDao customerDao;

    /**
     * 根据id查询
     */
    @Test
    public void testFindOne(){
        Customer customer = customerDao.findOne(3l);
        System.out.println(customer);
    }
    /**
     * 修改客户：调用save(obj)方法
     *      对于save方法的解释：如果执行此方法是对象中存在id属性，即为更新操作会先根据id查询，再更新
     *                      如果执行此方法中对象中不存在id属性，即为保存操作
     *
     */

    @Test
    public void testSave(){
        Customer customer = new Customer();
        customer.setCustName("华为手机");
        customer.setCustIndustry("电子产品");
        customerDao.save(customer);//保存

    }

    /**
     * 更新
     */
    @Test
    public void testUpdate(){
        Customer customer = customerDao.findOne(7l);
        customer.setCustName("正点原子");
        customer.setCustIndustry("嵌入式开发");
        customerDao.save(customer);//更新

    }

    /**
     * 删除
     */
    @Test
    public void testDelete(){
        customerDao.delete(7l);

    }

    /**
     * 查询全部
     */
    @Test
    public void testFindAll(){
        List<Customer> list = customerDao.findAll();
        for (Customer customer:list){
            System.out.println(customer);
        }

    }
}

转载：https://blog.csdn.net/qq_41864648/article/details/105454949

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