springboot整合jpa

一、项目结构

二、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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>A01springboot</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!-- 父级依赖 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>

    <!-- springmvc和spring的jar包 -->
    <dependencies>
        <!--web相关-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
        <!-- MySql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <!-- maven项目指定编译器版本 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.9</source>
                    <target>1.9</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

三、MyApplication

package com.wuxi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApplication {
    //入口
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

四、application.yml

server:
  port: 8088 #端口号
  servlet:
    context-path: /wuxi #虚拟目录

spring:
  datasource:
    url: jdbc:mysql://172.21.25.10:3306/sbssm?characterEncoding=utf8&useSSL=false
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    database: MySQL
    show-sql: true
    generate-ddl: true
    hibernate:
      ddl-auto: update
      naming_strategy: org.hibernate.cfg.ImprovedNamingStrategy

五、bean

package com.wuxi.bean;

import lombok.Data;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Data
@Entity
public class Student {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;
    private Integer age;
}

六、repository

package com.wuxi.repository;

import com.wuxi.bean.Student;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface StudentRepository extends JpaRepository<Student, Integer> {
    List<Student> findAll();
}

七、测试

package com.wuxi.test;

import com.wuxi.MyApplication;
import com.wuxi.bean.Student;
import com.wuxi.repository.StudentRepository;
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;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = MyApplication.class)
public class MyJpaTest {
    @Autowired
    private StudentRepository studentRepository;

    @Test
    public void test01() {
        List<Student> students = studentRepository.findAll();
        System.out.println(students);
    }
}