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修改pom.xml文件，加入下面的依赖
org.springframework.boot
spring-boot-starter-data-jpa
mysql
mysql-connector-java
修改配置文件：
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/cxx
username: root
password: 123456
jpa:
hibernate:
ddl-auto: create
show-sql: true创建实例给出get、set方法
注意这里的注解：@Entity、@Id、 @GeneratedValue
package com.example.demo.controller;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
/**
* 与数据库字段对应
*/
@Entity
public class user {
@Id
@GeneratedValue
private int id;
private String name;
private String type;
public user() {
}public int getId() {
return id;
}public void setId(int id) {
this.id = id;
}public String getName() {
return name;
}public void setName(String name) {
this.name = name;
}public String getType() {
return type;
}public void setType(String type) {
this.type = type;
}
}重新运行项目，会在数据库中根据自己定义的类在数据库中创建对应的表
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jpa:
hibernate:
ddl-auto: create
show-sql: trueddl-auto:create 每次运行项目都会将原表删除，在重新新建表（数据没了）
ddl-auto:create 每次运行项目会将原表删除，单新建会把元数据也插入进去
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实现api接口：
定义仓库接口:
package com.example.demo;
import com.example.demo.controller.user;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserRepository extends JpaRepository {
public user findByName(String name);
}
【spring-boot 数据库操作】编写Controller：
package com.example.demo;
import com.example.demo.controller.user;
import org.hibernate.annotations.Parameter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
public class helloController
{
@Autowired
private UserRepository userRepository;
/**
* 获取所有用户列表
* @return
*/
@GetMapping(value = "https://www.it610.com/users")
public List userList(){
return userRepository.findAll();
}/**
*
* @param name
* @param type
* 添加用户
* @return
*/
@PostMapping(value = "https://www.it610.com/users")
public user userAdd(@RequestParam("name") String name,
@RequestParam("type") String type){
user u = new user();
u.setName(name);
u.setType(type);
return userRepository.save(u);
}/**
* 查询一个用户
* @return
*/
@GetMapping(value = "https://www.it610.com/user/{id}")
public user userOne(@PathVariable("id") Integer id){
return userRepository.findOne(id);
}/**
* 更新一个用户
*/
@PutMapping(value = "https://www.it610.com/user/{id}")
public user userUpdate(@PathVariable("id") Integer id,
@RequestParam("name") String name,
@RequestParam("type") String type){
user u = new user();
u.setId(id);
u.setName(name);
u.setType(type);
return userRepository.save(u);
}/**
* 删除一条数据
*/
@DeleteMapping(value = "https://www.it610.com/user/{id}")
public void userDelete(@PathVariable("id") Integer id){
userRepository.delete(id);
}/**
* 通过年龄查询列表
* @param name
* @param type
* @return
*/
@GetMapping(value = "https://www.it610.com/user/name/{name}")
public user userAdd(@PathVariable("name") String name){
return userRepository.findByName(name);
}}
