Spring Data Jpa的入門以及原理剖析

搭建環境

導入座標

<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單元測試 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.9</version>
        <scope>test</scope>
    </dependency>

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

    <!-- log begin -->
    <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 begin 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spring的配置文件

<?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entityMangerFactory對象交給spring管理-->
    <bean id="entityMangerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
            <property name="dataSource" ref="dataSource"></property>
            <!--配置包掃描，實體類所在的包-->
        <property name="packagesToScan" value="cn.itcast.domain"></property>
            <!--配置jpa的實現方式-->
        <property name="persistenceProvider">
                <bean class="org.hibernate.jpa.HibernatePersistenceProvider"></bean>
            </property>
            <!--配置jpa的供應商適配器-->
                    <property name="jpaVendorAdapter">
                <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                    <!--是否自動創建數據庫表-->
                    <property name="generateDdl" value="false" />
                    <!--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語句-->
                    <property name="showSql" value="true" />
                    </bean>
            </property>
            <!--jpa的方言，高級特性-->
                    <property name="jpaDialect">
                <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"></bean>
            </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:///eesy"></property>
            <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        </bean>
        <!--3.整合springdatajpa-->
                        <jpa:repositories base-package="cn.itcast.dao" transaction-manager-ref="transactionManager" entity-manager-factory-ref="entityMangerFactory"></jpa:repositories>
        <!--配置事務管理器-->
                            <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
            <property name="entityManagerFactory" ref="entityMangerFactory"></property>
        </bean>
        <!--5.聲明式事務-->
                                <!--<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>-->

            <!--6.配置包掃描-->
            <context:component-scan base-package="cn.itcast"></context:component-scan>

</beans>

編寫實體類，使用jpa註解配置映射關係

package cn.itcast.domain;


import javax.persistence.*;

@Entity
@Table(name = "customer")
public class Customer {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Integer id;
    @Column(name = "address")
    private String address;
    @Column(name = "industry")
    private String industry;
    @Column(name = "level")
    private String level;
    @Column(name = "name")
    private String name;
    @Column(name = "phone")
    private String phone;
    @Column(name = "source")
    private String source;

    @Override
    public String toString() {
        return "Customer{" +
            "id=" + id +
            ", address='" + address + '\'' +
            ", industry='" + industry + '\'' +
            ", level='" + level + '\'' +
            ", name='" + name + '\'' +
            ", phone='" + phone + '\'' +
            ", source='" + source + '\'' +
            '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getIndustry() {
        return industry;
    }

    public void setIndustry(String industry) {
        this.industry = industry;
    }

    public String getLevel() {
        return level;
    }

    public void setLevel(String level) {
        this.level = level;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getSource() {
        return source;
    }

    public void setSource(String source) {
        this.source = source;
    }
}

編寫一個符合springDatajpa的dao層接口

只需要編寫dao層的接口，不需要編寫dao層的實現類

/**
 * 符合springdatajpa的dao層接口規範
 *      JpaRepository<操作的實體類的類型,實體類中主鍵屬性的類型>,封裝了基本CRUD操作
 *      JpaSpecificationExecutor<操作的實體類的類型>，封裝了複雜查詢的操作
 */
public interface CustomerDao extends JpaRepository<Customer,Integer>, JpaSpecificationExecutor<Customer> {
}

測試代碼：

import cn.itcast.dao.CustomerDao;
import cn.itcast.domain.Customer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;
import java.util.List;

@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 CustomerDaoTest {

    @Resource
    CustomerDao customerDao;

    /*
    * 根據id查詢
    * */
    @Test
    public void testFinOne(){
        Customer customer = customerDao.findOne(1);
        System.out.println(customer);
    }

    /*
     * save():保存或者更新
     *      根據傳遞的對象是否存在主鍵id,如果沒有，保存
     *       存在id主鍵屬性，根據id查詢數據，更新數據(如果傳遞了主鍵id，但是數據庫中沒有對應的主鍵，那麼傳遞的主鍵不會生效，還是保存)
     * */
    @Test
    public void testSave(){
        Customer customer = new Customer();
        customer.setLevel("VIP");
        customer.setName("黑馬程序員");
        customerDao.save(customer);
    }

    @Test
    public void testUpdate(){
        Customer customer = new Customer();
        customer.setId(4);
        customer.setName("黑馬程序員厲!");
        customerDao.save(customer);
    }

    /*
     * del():根據id刪除
     * */
    @Test
    public void testDelete(){
        customerDao.delete(5);
    }

    /*
     * 查詢所有的客戶
     * */
    @Test
    public void testFindAll(){
        List<Customer> lists = customerDao.findAll();
        System.out.println(lists);
    }
}

springDataJpa的運行過程和原理剖析
1. 通過JDKDynamicAopproxy的invoke方法創建了一個動態代理對象
2. SimpleJpaRepository當中封裝了jpa的操作(藉助JPA的api完成數據庫的CRUD)
3. 通過Hibernate完成數據庫的操作(封裝了jdbc)

Spring Data Jpa的入門以及原理剖析

Spring Data Jpa的入門以及原理剖析

搭建環境

導入座標

配置spring的配置文件

編寫實體類，使用jpa註解配置映射關係

編寫一個符合springDatajpa的dao層接口

測試代碼：

springDataJpa的運行過程和原理剖析

多線程併發---java中線程中斷的方式

Spring Data Jpa的入門以及原理剖析

Linux---CentOS8安裝mysql5.7和CentOS6.5安裝Mysql5.7

Spring DataJPA的Specifications動態查詢

Spring Data JPA對象導航視圖

Mac下配置sublime實現LaTeX

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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