SpringBoot系列之——整合JPA、mysql

<?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>com.example</groupId>
<artifactId>springboot-jpa-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springboot-jpa-demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.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>
<!-- jpa依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- mysql依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>

<!-- 热部署 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<!-- optional=true, 依赖不会传递, 该项目依赖devtools; 之后依赖boot项目的项目如果想要使用devtools, 需要重新引入 -->
<optional>true</optional>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>


</project>

spring:
profiles:
active: test
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
username: root
password: 123
jpa:
database: MYSQL
hibernate: 
ddl-auto: update
show-sql: true
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: UTC

spring:
devtools:
restart:
enabled: true
additional-paths: src/main/java

package com.example.entity;

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

@Entity
@Table(name="t_user")
public class User {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)//自增
private Integer id;

private String name;

private String passWord;

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 String getPassWord() {
return passWord;
}

public void setPassWord(String passWord) {
this.passWord = passWord;
}
}

package com.example.demo.controller;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.entity.User;
import com.example.demo.service.IUserService;
@RestController
public class UserController {

@Autowired
IUserService userService;

@GetMapping(value="/getUserById")
public Optional<User> findUserById(@RequestParam("Id") Integer id){
return userService.findUserById(id);
}
@GetMapping("/all")
public List<User> findAll(){
return userService.findAll();
}

@PostMapping("/update")
public User updateUser(@RequestParam("Id") Integer id,@RequestParam("name") String name,@RequestParam("passWord") String passWord) {
return userService.updateUserById(id, name, passWord);
}

@PutMapping("/insert")
public User insertUser(@RequestParam("name") String name,@RequestParam("passWord") String passWord) {
return userService.insertUser(name, passWord);
}

@DeleteMapping("/delete")
public void deleteUser(@RequestParam("Id") Integer id) {
userService.deleteUserById(id);
}
}

package com.example.demo.service;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.example.demo.dto.IUserDto;
import com.example.demo.entity.User;
@Service
public class UserServiceImpl implements IUserService{

@Autowired
IUserDto iUserDto;

@Override
public Optional<User> findUserById(Integer id) {
return iUserDto.findById(id);
}

@Override
public User updateUserById(Integer id,String name, String passWord) {
User user = new User();
user.setId(id);
user.setName(name);
user.setPassWord(passWord);
return iUserDto.save(user);
}

@Override
public User insertUser(String name, String passWord) {
User user = new User();
user.setName(name);
user.setPassWord(passWord);
return iUserDto.save(user);
}

@Override
public void deleteUserById(Integer id) {
iUserDto.deleteById(id);
}

@Override
public List<User> findAll() {
return iUserDto.findAll();
}
}
c.dto:

package com.example.demo.dto;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;

import com.example.demo.entity.User;

public interface IUserDto extends JpaRepository<User,Integer>{//默认传的是ID为条件，如果需要其他条件来进行CRDU操作可通过增加方法来实现

public List<User> findByName(String name);//方法名不能乱写，要按你需要的条件来写 findBy你的字段名 
}