spring boot——集成JPA——入门示例001
作者：互联网
需要新增的依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
pom文件如下：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.mohai.one</groupId> <artifactId>springboot-data-jpa</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springboot-data-jpa</name> <description>spring-data-jpa整合实现</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
application.yml配置信息：
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/mohai_demo?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=true&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=convertToNull
username: root
password: 123456
# JPA配置
jpa:
# 数据库类型
database: mysql
# 切换默认的存储引擎切换为InnoDB
database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
# 输出日志中打印出执行的SQL语句
show-sql: true
# 配置程序在启动的时候自动操作实体类对应的表
hibernate:
#create：程序重新启动时，都会重新创建表，会造成数据会丢失
#create-drop：每次运行程序时，会先创建表结构，然后待程序结束时清空表
#upadte：每次运行程序时，实体对应没有表时会创建表，如果实体发生改变会更新表结构，原来数据不会清空只会更新
#validate：每次运行程序时，会校验数据与数据库的字段类型是否相同
ddl-auto: update
UserEntity类
package com.mohai.one.springbootjpa.domain;
import javax.persistence.*;
@Entity //必选注解，声明和数据库中user表关联
@Table(name = "user") //可选注解，声明实体对应的表信息
public class UserEntity {
@Id // 表名实体唯一标识
@GeneratedValue(strategy = GenerationType.IDENTITY) //主键自动生成策略
private Integer id;
//@Column定义列名和属性，默认为字段名
@Column
private String name;
@Column
private int age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
UserRepository
package com.mohai.one.springbootjpa.repository;
import com.mohai.one.springbootjpa.domain.UserEntity;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserRepository extends JpaRepository<UserEntity,Integer> {
List<UserEntity> findAllByName(String name);
@Modifying
@Query(value = "insert into user(id,name,age) values(:id,:name,:age)",nativeQuery = true)
int insertNameAndAge(@Param("id") Integer id, @Param("name") String name, @Param("age") int age);
}
UserService
package com.mohai.one.springbootjpa.service;
import com.mohai.one.springbootjpa.domain.UserEntity;
import com.mohai.one.springbootjpa.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.ArrayList;
import java.util.List;
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
//查
public List<UserEntity> getAll(){
return userRepository.findAll();
}
//查
public List<UserEntity> findAllByName(String name){
return userRepository.findAllByName(name);
}
//通过id查询
public UserEntity getOne(Integer id){
return userRepository.findById(id).get();
}
//改
@Transactional
public UserEntity updateUser(UserEntity userEntity){
return userRepository.saveAndFlush(userEntity);
}
//增
@Transactional
public int insertUser(UserEntity userEntity){
return userRepository.insertNameAndAge(userEntity.getId(),userEntity.getName(),userEntity.getAge());
}
//删
@Transactional
public void deleteUserById(Integer id){
userRepository.deleteById(id);
}
}
UserController
package com.mohai.one.springbootjpa.controller;
import com.mohai.one.springbootjpa.domain.UserEntity;
import com.mohai.one.springbootjpa.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* @Created by moerhai@qq.com
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/findAll")
public List<UserEntity> findAll(){
return userService.getAll();
}
@RequestMapping("/findAllByName")
public List<UserEntity> findAllByName(String name){
return userService.findAllByName(name);
}
//通过主键Id查询
@RequestMapping("/getOne/{id}")
public UserEntity getUserById(@PathVariable Integer id){
return userService.getOne(id);
}
@RequestMapping("/save")
public int save(@RequestBody UserEntity userEntity){
return userService.insertUser(userEntity);
}
@RequestMapping("/edit")
public UserEntity edit(@RequestBody UserEntity userEntity){
return userService.updateUser(userEntity);
}
@RequestMapping("/delete")
public int delete(@RequestParam("id") Integer id){
userService.deleteUserById(id);
return 1;
}
}
标签：示例,JPA,spring,boot,springframework,id,import,org,public 来源： https://www.cnblogs.com/xiaobaibailongma/p/16324558.html