SpringBoot 1024行代码 - 用JPA访问MySQL

摘要：前言访问关系型数据库是工程常见的需求。是当今业界应用最广泛的开源关系型数据库。全家桶提供了，可以让开发者方便快捷地开发出访问的业务代码。

访问关系型数据库是Web工程常见的需求。MySQL是当今业界应用最广泛的开源关系型数据库。Spring Boot全家桶提供了JPA，可以让开发者方便快捷地开发出访问MySQL的业务代码。

1 安装jdk1.8
2 安装maven
3 具备Spring和SpringMVC的基础知识

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CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) DEFAULT NULL,
  `phone` varchar(45) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

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        org.springframework.boot
        spring-boot-starter-parent
        1.5.8.RELEASE
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.springframework.boot
            spring-boot-starter-data-jpa
        
        
        
            mysql
            mysql-connector-java
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

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package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

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spring.jpa.hibernate.ddl-auto=none
spring.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=false
spring.datasource.username=root
spring.datasource.password=

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package com.example.demo.entity;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class User {
    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private Integer id;
    private String name;
    private String phone;
    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 getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
}

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package com.example.demo.repository;
import com.example.demo.entity.User;
import org.springframework.data.repository.CrudRepository;
public interface UserRepository extends CrudRepository {
}

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package com.example.demo.controller;
import com.example.demo.entity.User;
import com.example.demo.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UserController {
    @Autowired
    private UserRepository userRepository;
    /**
     * add user
     * @param name
     * @param phone
     * @return
     */
    @RequestMapping(path="/user", method = RequestMethod.POST)
    @ResponseBody
    public String addNewUser (@RequestParam String name, @RequestParam String phone) {
        User n = new User();
        n.setName(name);
        n.setPhone(phone);
        userRepository.save(n);
        return "Success";
    }
}

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curl -X POST 127.0.0.1:8080/user -d "name=tom&phone=654321"

观察数据库user表，发现增加了一条新数据

https://github.com/gzllol/spr...