Spring Boot2集成JPA

小咪咪 2022-04-15 06:44 250阅读 0赞

目前工作中在使用Spring Boot2，陆续会集成众多开发框架，因此整理成博客，记录下来，方便以后使用。  
管理工具使用Maven，采用模块化开发，各模块尽量能够独立运行，主要用于记录学习过程，因此可能会有很多冗余代码。

## 项目结构图 ##

![项目结构图][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1X2JveQ_size_16_color_FFFFFF_t_70]

## 项目pom.xml ##

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    
        
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.6.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <modelVersion>4.0.0</modelVersion>
    
        
        
        
        <groupId>com.wu.parker</groupId>
    
        
        
        <artifactId>parker</artifactId>
    
        <version>0.0.1-SNAPSHOT</version>
    
        <modules>
            <module>parker-jpa</module>
        </modules>
    
        
        
        <packaging>pom</packaging>
    
        
        <name>${project.artifactId}</name>
    
        <description>spring boot demo</description>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
    
            <postgresql.version>42.2.5</postgresql.version>
        </properties>
    
        
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        
        
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.postgresql</groupId>
                    <artifactId>postgresql</artifactId>
                    <version>${postgresql.version}</version>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <finalName>parker</finalName>
        </build>
    
    </project>

## parker-jpa模块的pom.xml如下 ##

## application.yml ##

spring:
      datasource:
        driver-class-name: org.postgresql.Driver
        url: jdbc:postgresql://localhost:5432/test
        username: postgres
        password: postgres
      jpa:
        properties:
          hibernate:
            hbm2ddl:
              auto: update
            dialect: org.hibernate.dialect.PostgreSQLDialect
            temp:
              use_jdbc_metadata_defaults: false
        show-sql: true

## 启动类 ##

package com.wu.parker.jpa;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /**
     * @author: wusq
     * @date: 2018/11/22
     */
    @SpringBootApplication
    public class JpaApplication {
        public static void main(String[] args) {
            SpringApplication.run(JpaApplication.class, args);
        }
    }

## User实体类 ##

package com.wu.parker.jpa.po;
    
    import org.hibernate.annotations.GenericGenerator;
    
    import javax.persistence.*;
    
    /**
     * @author: wusq
     * @date: 2018/11/22
     */
    
    @Entity
    @Table(name="user_test")
    public class User {
    
        @Id
        @GenericGenerator(name = "uuid", strategy = "uuid")
        @GeneratedValue(generator = "uuid")
        @Column(length = 32)
        private String id;
    
        @Column(length = 32, unique = true, nullable = false)
        private String username;
    
        @Column(length = 32, nullable = false)
        private String password;
    
        // 请自行补上get/set方法
    }

## 持久层接口 ##

持久层接口只需继承JpaRepository即可，好像还有其他接口可以继承，可以按需修改。

package com.wu.parker.jpa.dao;
    
    import com.wu.parker.jpa.po.User;
    import org.springframework.data.jpa.repository.JpaRepository;
    
    /**
     * @author: wusq
     * @date: 2018/11/22
     */
    public interface UserRepository extends JpaRepository<User, String> {
    }

## 测试类 ##

package com.wu.parker.jpa.test;
    
    import com.wu.parker.jpa.dao.UserRepository;
    import com.wu.parker.jpa.po.User;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    /**
     * @author: wusq
     * @date: 2018/11/22
     */
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserRepositoryTest {
    
        @Autowired
        private UserRepository userRepository;
    
        @Test
        public void contextLoads() {
        }
    
        @Test
        public void testSave() throws Exception {
            User user = new User();
            user.setUsername("admin");
            user.setPassword("admin");
            userRepository.save(user);
        }
    }

运行测试类，会自动在数据库建表，并保存一条数据。

## 源代码 ##

[https://github.com/wu-boy/parker.git][https_github.com_wu-boy_parker.git]

## 参考资料 ##

1、《Maven实战》，徐晓斌著。  
2、[springboot(五)：spring data jpa的使用][springboot_spring data jpa]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1X2JveQ_size_16_color_FFFFFF_t_70]: /images/20220415/c3740e9aada446a5b60f02ecc50425e2.png
[https_github.com_wu-boy_parker.git]: https://github.com/wu-boy/parker.git
[springboot_spring data jpa]: http://www.ityouknow.com/springboot/2016/08/20/spring-boo-jpa.html