spring boot 整合 jpa

1、在pom.xml中添加mysql 和 jpa 依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope>
</dependency>

2、在application.properties中配置数据库连接信息

#mysql
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/boot_v2?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8
spring.datasource.username=root
spring.datasource.password=root#jpa
#第一次建表设置为create 后面改为update，不然每次重启工程会删除表并新建
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql: true

3、编写实体类：UserEntity

package com.ldy.bootv2.demo.entity;import java.io.Serializable;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;import com.fasterxml.jackson.annotation.JsonIgnoreProperties;import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;@Entity
@ApiModel
@Table(name="user")
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler"})
public class UserEntity implements Serializable {private static final long serialVersionUID = 1L;@Id@GeneratedValue@ApiModelProperty(value="id，新建时不传，修改时传")private Integer id;@Column@ApiModelProperty(value="名称")private String name;@Column@ApiModelProperty(value="年龄")private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}}

4、编写dao：UserDao

package com.ldy.bootv2.demo.dao;import org.springframework.data.jpa.repository.JpaRepository;import com.ldy.bootv2.demo.entity.UserEntity;public interface UserDao extends JpaRepository<UserEntity,Integer> {}

5、编写Controller：UserController

package com.ldy.bootv2.demo.controller;import java.util.List;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import com.ldy.bootv2.demo.dao.UserDao;
import com.ldy.bootv2.demo.entity.UserEntity;import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;@Api(tags = "用户信息管理接口-API")
@RestController
@RequestMapping("/user")
public class UserController {private static Logger logger = LoggerFactory.getLogger(UserController.class);@AutowiredUserDao userDao;@GetMapping("/findAll")@ApiOperation("查询全部用户")public List<UserEntity> findAll() {logger.info("您调用了findAll接口");return userDao.findAll();}@GetMapping("/getOne/{id}")@ApiOperation("根据ID查询用户")public UserEntity getOne(@ApiParam(value="用户id",required=true) @PathVariable("id") Integer id) {logger.info("您调用了getOne接口");return userDao.getOne(id);}@PutMapping("/saveOrUpdate")@ApiOperation("新增或者修改用户")public String saveOrUpdate(@ModelAttribute UserEntity entity) {logger.info("您调用了saveOrUpdate接口");try {userDao.save(entity);} catch (Exception e) {logger.error("失败，原因：" + e.getMessage());return "error";}return "success";}@DeleteMapping("/delete/{id}")@ApiOperation("根据ID删除用户")public String deleteById(@ApiParam(value="用户id",required=true) @PathVariable("id") Integer id) {logger.info("您调用了delete接口");try {userDao.deleteById(id);} catch (Exception e) {logger.error("失败，原因：" + e.getMessage());return "error";}return "success";}}

6、运行项目，打开swagger页面，测试接口正常，swagger的集成请查看：https://blog.csdn.net/LDY1016/article/details/83415640

源码下载地址：https://pan.baidu.com/s/1Z771VDiuabDBJJV445xLeA#list/path=%2Fspring%20boot%202.x%20%E4%BB%A3%E7%A0%81

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