Springboot对mysql数据库进行增删改查操作
一、创建Springboot项目并创建包、class、interface。如图所示
1.1各个class和interface文件中的代码
User:
package com.example.demo.entity
import lombok.Data;
import org.hibernate.annotations.CreationTimestamp;
import org.springframework.format.annotation.DateTimeFormat;
import javax.persistence.*;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;
@Table(name ="company")
@Entity
@Data
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String company_code;
private Boolean monitor_type;
private String sys_name;
private Integer equipment_type_id;
private String equipment_type_name;
private Integer sensor_type_id;
private String sensor_type_name;
private Integer technology_type_id;
private String technology_type_name;
private String department;
private String sensor_code;
private String location;
private String storage_material;
private BigDecimal level_alarm_high;
private BigDecimal secondary_alarm_high;
private BigDecimal level_alarm_low;
private BigDecimal secondary_alarm_low;
private Integer operate_id;
private String operate_username;
@CreationTimestamp
@Column(name="create_time")
@DateTimeFormat(pattern = "yyyy-mm-dd")
private Date create_time;
@CreationTimestamp
@Column(name="update_time")
@DateTimeFormat(pattern = "yyyy-mm-dd")
private Date update_time;
}
}
UserDao:
package com.example.demo.dao;
import com.example.demo.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;
public interface UserDao extends JpaRepository<User,Integer> {
List<User> findById(int id);
UserService:
package com.example.demo.service;
import com.example.demo.entity.User;
import java.util.List;
public interface UserService {
/**
* 根据查询用户
* @return
*/
// List<User> queryByTypeid(int typed);
/**
* 保存用户
* @param user
* @return
*/
User save(User user);
/**
* 根据主键删除用户
* @param id
*/
void deletUserById(int id);
/**
* 根据主键查询
* @param id
* @return
*/
User queryById(int id);
}
UserController:
package com.example.demo.controller;
import com.example.demo.entity.User;
import com.example.demo.service.RedisService;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("user")
public class UserController {
@Autowired
private UserService userService;
@Autowired
private RedisService redisService;
@GetMapping("/queryById")
public String queryById(Integer id) {
String userStr = redisService.get(id + "");
if (userStr == null) {
redisService.set(id + "", userService.queryById(id).toString());
return userService.queryById(id).toString();
}
return userStr;
}
/**
* 增 改
*
* @param user
* @return
*/
@PostMapping("/saveOrUpdate")
public User saveOrUpdateUser(User user) {
return userService.save(user);
}
/**
* 删除用户
*
* @param id
* @return
*/
@DeleteMapping("/delete")
public Boolean deleteUser(int id) {
userService.deletUserById(id);
return true;
}
}
RedisService:
package com.example.demo.service;
public interface RedisService {
/**
* 储存数据
* @param key
* @param value
*/
void set(String key, String value);
/**
* 获取数据
* @param key
* @return
*/
String get(String key);
/**
* 设置超期时间
* @param key
* @param expire
* @return
*/
boolean expire(String key, long expire);
/**
* 删除数据
* @param key
*/
void remove(String key);
/**
* 自增操作
* @param key
* @param delta 自增步长
* @return
*/
Long incream(String key, long delta);
void findOne(String key);
}
UserServiceImpl:
package com.example.demo.service.impl;
import com.example.demo.dao.UserDao;
import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
// @Override
// public List<User> queryByTypeid(int typeid) {
// return userDao.findById(typeid);
// }
@Override
public User save(User user) {
return userDao.save(user);
}
@Override
public void deletUserById(int id) {
}
@Override
public User queryById(int id) {
return userDao.getOne(id);
}
}
RedisServiceImpl:
package com.example.demo.service.impl;
import com.example.demo.service.RedisService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import java.util.concurrent.TimeUnit;
@Service
public class RedisServiceImpl implements RedisService {
@Autowired
private StringRedisTemplate stringRedisTemplate;
@Override
public void set(String key, String value) {
stringRedisTemplate.opsForValue().set(key,value);
}
@Override
public String get(String key) {
return stringRedisTemplate.opsForValue().get(key);
}
@Override
public boolean expire(String key, long expire) {
return stringRedisTemplate.expire(key, expire, TimeUnit.SECONDS);
}
@Override
public void remove(String key) {
stringRedisTemplate.delete(key);
}
@Override
public Long incream(String key, long delta) {
return stringRedisTemplate.opsForValue().increment(key, delta);
}
@Override
public void findOne(String key) {
}
}
Swagger2Config:
package com.example.demo.config;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
import java.lang.annotation.Documented;
@Configuration
@EnableSwagger2
public class Swagger2Config {
@Bean
public Docket createRestApi(){
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.select()
//为当前包下controller生成API文档
.apis(RequestHandlerSelectors.basePackage("com.example.demo.controller"))
//为有@Api注解的Controller生成API文档
// .apis(RequestHandlerSelectors.withClassAnnotation(Api.class))
//为有@ApiOperation注解的方法生成API文档
// .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
.paths(PathSelectors.any())
.build();
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("SwaggerUI演示")
.description("内蒙古电子大数据工坊")
.contact("ZS")
.version("1.0")
.build();
}
}
导入依赖：pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- druid数据库连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
<!--lombok依赖-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--Swagger-UI API文档生产工具-->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
application.yml: //后缀名手动修改为.yml
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useSSL=false&useUnicode=true&charactEnoding=utf-8&autoReconnect=true&serverTimezone=Asia/Shanghai
username: root
password: 123456
initiaSize: 20
minIdle: 50
maxActive: 500
jpa:
hibernate:
ddl-auto: update
show-sql: true
如果redis有密码的设置，则在此声明。
关于redis操作在“安装redis”博文中介绍。
点击运行，结果如图：
数据库表如图
在网页搜索：http://localhost:8080/swagger-ui.html
在此页面测试是否可以对表进行操作
以增加为例结果如图：
再次查看表（记得刷新）
或者用Postman软件，输入网址：http://localhost:8080/user/queryById?id=1
表示成功。
写博文容易，其中问题层出不穷，解决问题才能进步！！！！！！！！！