springboot 怎么加载mysql的

Posted 2023-03-09

参考技术A 加入mysql数据库和JPA。
配置:
pom.xml文件

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<!-- 添加Mysql和JPA-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
在Application.properties(在resource文件夹下新建，进行配置)文件中添加数据进行配置：

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spring.datasource.url = jdbc:mysql://localhost:3306/spring_boot
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver

# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
User类

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package com.seawater.bean;

import javax.persistence.*;
import javax.validation.constraints.NotNull;

/**
* Created by zhouhs on 2016/12/30.
*/
@Entity
@Table(name = "user")
public class User

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private int age;

public Long getId()
return id;


public void setId(Long 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;


UserController

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package com.seawater.controller;

import com.seawater.Dao.UserDao;
import com.seawater.bean.User;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
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.RestController;

import javax.annotation.Resource;

/**
* Created by zhouhs on 2016/12/30.
*/
@RestController
@RequestMapping(value = "/user")
@Api(description = "用户")
public class UserController

@Resource
UserDao userDAO;

@ApiOperation(value = "添加用户")
@ApiImplicitParams(
@ApiImplicitParam(name = "name" , value = "name" , paramType = "query" , required = true ),
@ApiImplicitParam(name = "age" , value = "age" , paramType = "query" , required = true )
)
@RequestMapping(value = "/addUser" , method = RequestMethod.POST)
public String addUser(@RequestParam(value = "name") String name,@RequestParam(value = "age") int age)

User user = new User();
user.setName(name);
user.setAge(age);

userDAO.save(user);

return "add user success !";


@ApiOperation(value = "查找用户")
@ApiImplicitParam(name = "id" , value = "id" , paramType = "query" , required = true , dataType = "int")
@RequestMapping(value = "/findById" , method = RequestMethod.POST)
public String findById(@RequestParam(value = "id") Long id)

User user = userDAO.findById(id);

if(user == null)
return "error";
else
return "name:" + user.getName() + " , age:" + user.getAge();



@ApiOperation(value = "查询所有用户")
@RequestMapping(value = "/findAll" , method = RequestMethod.POST)
public Iterable findAll()

Iterable<User> userList = userDAO.findAll();

return userList;



@ApiOperation(value = "删除用户")
@ApiImplicitParam(name = "id" , value = "id" , paramType = "query" , required = true , dataType = "int")
@RequestMapping(value = "/deleteById" , method = RequestMethod.POST)
public String deleteById(@RequestParam(value = "id") Long id)

userDAO.delete(id);
return "delete success !";




数据表(id定义为Integer)：

UserDao:

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package com.seawater.Dao;

import com.seawater.bean.User;
import org.springframework.data.repository.CrudRepository;

/**
* Created by zhouhs on 2016/12/30.
*/
public interface UserDao extends CrudRepository<User, Long>

public User findById(Long id);


然后启动项目：访问http://localhost:8081/swagger-ui.html
结果：

方法我就不一一操作了。