使用spring boot jpa进行增删改查

项目地址：https://gitee.com/indexman/spring_boot_in_action

编写实体类User

package com.laoxu.springboot.entity;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import javax.persistence.*;

/**
 * 用户实体
 */
@Entity
@Table(name = "tbl_user")
@JsonIgnoreProperties( value={"hibernateLazyInitializer","handler"})
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Column(name = "last_name", length = 50)
    private String lastName;
    @Column
    private String email;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

编写UserRepository接口

package com.laoxu.springboot.repository;

import com.laoxu.springboot.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository  extends JpaRepository<User,Integer> {
}

配置application.yml

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: root123
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT&useSSL=false
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

编写UserController

package com.laoxu.springboot.controller;

import com.laoxu.springboot.entity.User;
import com.laoxu.springboot.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 用户控制器
 */
@RestController
public class UserController {
    @Autowired
    UserRepository userRepository;

    @GetMapping(value = "/user/{id}")
    public User getUser(@PathVariable("id") Integer id){
        User user = userRepository.getOne(id);
        return user;
    }

    @GetMapping("/user")
    public User addUser(User user){
        User newUser = userRepository.save(user);

        return newUser;
    }

}

启动项目测试

控制台日志：

Hibernate: select user0_.id as id1_0_0_, user0_.email as email2_0_0_, user0_.last_name as last_nam3_0_0_ from tbl_user user0_ where user0_.id=?
2019-01-17 23:46:27.137  WARN 59592 --- [nio-8080-exec-9] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by handler execution: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "lastName=zhangsan&email=zhangsan@1.com"
Hibernate: insert into tbl_user (email, last_name) values (?, ?)
Hibernate: select user0_.id as id1_0_0_, user0_.email as email2_0_0_, user0_.last_name as last_nam3_0_0_ from tbl_user user0_ where user0_.id=?