Spring Boot 添加MySQL数据库及JPA实例

Spring Boot 添加MySQL数据库及JPA实例

最近在学习Spring Boot，继续前面的学习，这一次我们加入mysql数据库和JPA。

配置:

pom.xml文件

org.springframework.boot

spring-boot-starter-data-jpa

mysql

mysql-connector-java

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：

spring.datasource.url = jdbc:mysql://localhost:3306/spring_boot

spring.datasource.username = root

spring.datasource.password = root

sprihttp://ng.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

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

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.ResWaoqDbource;

/**

* 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 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:

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 {

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。

源码地址(项目中的源码可能会更多哦，需要自己找到对应源码)：SpringBootLearning_jb51.rar

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