SpringDataJPA簡單操作

導入jar包（添加依賴）

    <properties>
        <spring.version>5.0.2.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單元測試 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</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>

        <!-- spring對orm框架的支持包-->
        <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>

        <!-- spring data jpa 的座標-->
        <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>${spring.version}</version>
        </dependency>

        <!-- el beg 使用spring data jpa 必須引入 -->
        <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>

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: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">

    <!--spring 和 spring data jpa的配置-->
    <!-- 1.創建entityManagerFactory對象交給spring容器管理-->
    <bean id="entityManagerFactoty" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--配置的掃描的包（實體類所在的包） -->
        <property name="packagesToScan" value="com.srzx.entity" />
        <!-- jpa的實現廠家 -->
        <property name="persistenceProvider">
            <bean class="org.hibernate.jpa.HibernatePersistenceProvider"/>
        </property>

        <!--jpa的供應商適配器 -->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <!--配置是否自動創建數據庫表 -->
                <property name="generateDdl" value="true" />
                <!--指定數據庫類型 -->
                <property name="database" value="MYSQL" />
                <!--數據庫方言：支持的特有語法 -->
                <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
                <!--是否顯示sql -->
                <property name="showSql" value="true" />
            </bean>
        </property>

        <!--jpa的方言 ：高級的特性 -->
        <property name="jpaDialect" >
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
        </property>

    </bean>
    <!--2.創建數據庫連接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
        <property name="jdbcUrl" value="jdbc:mysql:///jpa" ></property>
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
    </bean>
    <!--3.整合spring dataJpa-->
    <jpa:repositories base-package="com.srzx.dao" transaction-manager-ref="transactionManager"
                   entity-manager-factory-ref="entityManagerFactoty" ></jpa:repositories>

    <!--4.配置事務管理器 -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactoty"></property>
    </bean>
    <!-- 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(* com.srzx.service.*.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut" />
    </aop:config>
    <!--5.聲明式事務 -->

    <!-- 6. 配置包掃描-->
    <context:component-scan base-package="com.srzx" ></context:component-scan>
</beans>

實體類（Customer）

import javax.persistence.*;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;

@Entity//必須有
//@Table(name="cst_customer")
public class Customer {

    @Id//必須有
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    // @Column(name="cust_id")
    private Long custId;
    // @Column(name="cust_address")
    private String custAddress;
    //@Column(name="cust_industry")
    private String custIndustry;
    // @Column(name="cust_level")
    private String custLevel;
    // @Column(name="cust_name")
    private String custName;
    // @Column(name="cust_phone")
    private String custPhone;
    // @Column(name="cust_source")
    private String custSource;

    public Long getCustId() {
        return custId;
    }

    public void setCustId(Long custId) {
        this.custId = custId;
    }

    public String getCustAddress() {
        return custAddress;
    }

    public void setCustAddress(String custAddress) {
        this.custAddress = custAddress;
    }

    public String getCustIndustry() {
        return custIndustry;
    }

    public void setCustIndustry(String custIndustry) {
        this.custIndustry = custIndustry;
    }

    public String getCustLevel() {
        return custLevel;
    }

    public void setCustLevel(String custLevel) {
        this.custLevel = custLevel;
    }

    public String getCustName() {
        return custName;
    }

    public void setCustName(String custName) {
        this.custName = custName;
    }

    public String getCustPhone() {
        return custPhone;
    }

    public void setCustPhone(String custPhone) {
        this.custPhone = custPhone;
    }

    public String getCustSource() {
        return custSource;
    }

    public void setCustSource(String custSource) {
        this.custSource = custSource;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "custId=" + custId +
                ", custAddress='" + custAddress + '\'' +
                ", custIndustry='" + custIndustry + '\'' +
                ", custLevel='" + custLevel + '\'' +
                ", custName='" + custName + '\'' +
                ", custPhone='" + custPhone + '\'' +
                ", custSource='" + custSource + '\'' +
                '}';
    }
}

dao層（CustomerDao）

import com.srzx.entity.Customer;
import org.springframework.data.jpa.repository.JpaRepository;

//JpaRepository<Customer,Long>  1,實體類 2, 實體類主鍵類型。
public interface CustomerDao extends JpaRepository<Customer,Long> {
}

測試層（TestCustomer）

import com.srzx.dao.CustomerDao;
import com.srzx.entity.Customer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

//Spring容器啓動，junit單元測試。
@RunWith(SpringJUnit4ClassRunner.class) //聲明spring提供的單元測試環境
@ContextConfiguration(locations = "classpath:applicationContext.xml")//指定spring容器的配置信息
public class TestCustomer {

    @Autowired
    private CustomerDao customerDao;

    @Test
    public void testSave() {
        for(int i=1;i<101;i++) {
            Customer customer = new Customer();
            customer.setCustName("程序員"+i);
            customer.setCustLevel("vip"+i);
            customer.setCustIndustry("it教育"+i);
            customerDao.save(customer);
        }
    }

    /**
     * 根據id查詢
     * 立即加載findOne
     */
    @Test
    public void testFindOne() {
        Customer customer = customerDao.findOne(12L);
        System.out.println(customer);
    }

    @Test
    public void testUpdate() {
        //hinernate 1,先通過ID查詢。(持久態)2，修改對象屬性；3，提交修改。
        //save()及時查詢又是修改；判斷有沒有ID。如果對象有ID修改；沒有ID就是保存。
        // Customer customer  = new Customer();
        // customer.setCustId(1L);
        //1,先通過ID查詢。(持久態)2，修改對象屬性；3，提交修改。
        Customer customer = customerDao.findOne(1L);
        customer.setCustName("程序員很厲害111");
        customerDao.save(customer);
    }

    @Test
    public void testDelete () {
        customerDao.delete(1L);
    }
    /**
     * 查詢所有
     */
    @Test
    public void testFindAll() {
        List<Customer> list = customerDao.findAll();
        for(Customer customer : list) {
            System.out.println(customer);
        }
    }
    /**
     * 測試統計查詢：查詢客戶的總數量
     *      count:統計總條數
     */
    @Test
    public void testCount() {
        long count = customerDao.count();//查詢全部的客戶數量
        System.out.println(count);
    }

    /**
     * 測試：判斷id爲4的客戶是否存在
     *      1. 可以查詢以下id爲4的客戶
     *          如果值爲空，代表不存在，如果不爲空，代表存在
     *      2. 判斷數據庫中id爲4的客戶的數量
     *          如果數量爲0，代表不存在，如果大於0，代表存在
     */
    @Test
    public void  testExists() {
        boolean exists = customerDao.exists(4L);
        System.out.println("id爲4的客戶 是否存在："+exists);
    }
    
    /**
     * 根據id從數據庫查詢
     *      @Transactional : 保證getOne正常運行
     *
     *  findOne：
     *      em.find()           :立即加載
     *  getOne：
     *      em.getReference     :延遲加載
     *      * 返回的是一個客戶的動態代理對象
     *      * 什麼時候用，什麼時候查詢
     */
    @Test
    @Transactional
    public void  testGetOne() {
        Customer customer = customerDao.getOne(4L);
        System.out.println(customer);
    }

}

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