SpringBoot连接MySQL

一、文件结构：

二、实体类

package com.example.demo.domain;

import java.io.Serializable;

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

@Entity
@Table(name = "user")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    private Long id;
    @Column(name = "username")
    private String userName;
    @Column(name = "password")
    private String passWord;

    public User() {
        super();
    }

    public User(String userName, String passWord) {
        super();
        this.userName = userName;
        this.passWord = passWord;
    }

    public Long getId() {
        return id;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

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

}

三、Dao

package com.example.demo.dao;


import org.springframework.data.jpa.repository.JpaRepository;
import com.example.demo.domain.User;

public interface UserRepository extends JpaRepository<User, Long> {
    User findByUserName(String userName);

}

四、Controller

package com.example.demo.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.dao.UserRepository;
import com.example.demo.domain.User;

@RestController
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping("/getAllUser")
    @ResponseBody
    public List<User> findAll() {
        List<User> list = new ArrayList<User>();
        list = userRepository.findAll();
        return list;
    }

    @RequestMapping("/getByUserName")
    @ResponseBody
    public User getByUserName(String userName) {
        User user = userRepository.findByUserName(userName);
        return user;
    }

}

五、application.properties配置

# MySQL Connection Configuration
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=12345678
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true

六、pom.xml

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        
        <!--mysql驱动连接 jar包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

七、表结构