数据库增删改查练习

创建数据库

再Idea配置

pom文件配置

配置先配置依赖pom文件 <dependencies> <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> <!--redis依赖配置--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </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> </dependencies>

application文件配置

配置application文件链接mysql数据库和redis spring: datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://127.0.0.1:3307/data?useSSL=false&useUnicode=true&characterEncoding=utf-8&autoReconnect=true&serverTimezone=Asia/Shanghai username: root password: 123456 initialSize: 20 minIdle: 50 maxActive: 500 jpa: hibernate: ddl-auto: update show-sql: true redis: host: localhost # Redis服务器地址 database: 0 # Redis数据库索引（默认为0） port: 6379 # Redis服务器连接端口 password: 123456 # Redis服务器连接密码（默认为空） jedis: pool: max-active: 8 # 连接池最大连接数（使用负值表示没有限制） max-wait: -1ms # 连接池最大阻塞等待时间（使用负值表示没有限制） max-idle: 8 # 连接池中的最大空闲连接 min-idle: 0 # 连接池中的最小空闲连接 timeout: 3000ms # 连接超时时间（毫秒）

UserController文件配置

配置UserController文件 package com.nmgdz.bigdata.controller; import com.nmgdz.bigdata.entity.User; import com.nmgdz.bigdata.service.RedisService; import com.nmgdz.bigdata.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; /** * @auther: xhd * @Date: 2020/9/1/11:15 */ @RestController @RequestMapping("user") public class UserController { @Autowired private UserService userService; @Autowired private RedisService redisService; /** * 查询 * * @param id * @return */ @GetMapping("/queryById") public User queryById(int id) { return userService.queryById(id); }

UserDao文件配置

配置UserDao文件 package com.nmgdz.bigdata.dao; import com.nmgdz.bigdata.entity.User; import org.springframework.data.jpa.repository.JpaRepository; import java.util.List; /** * 作者: xhd * 创建时间: 2020/3/12 19:51 * 版本: V1.0 */ public interface UserDao extends JpaRepository<User, Integer> { // List<User> findByAge(int age); User findById(int id); }

User文件配置

配置User文件 package com.nmgdz.bigdata.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; /** * 作者: xhd * 创建时间: 2020/3/12 19:43 * 版本: V1.0 */ @Table(name = "data_ys") @Entity @Data public class User implements Serializable { @Id //主键 @GeneratedValue(strategy = GenerationType.IDENTITY) //自增主键 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; // public User(String name, Integer age) { // this.name = name; // this.age = age; // } // // // public User() { // } }

RedisServiceImpl文件配置

配置RedisServiceimpl文件 package com.nmgdz.bigdata.service.impl; import com.nmgdz.bigdata.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; /** * @auther: xhd * @Date: 2020/9/2/0:26 */ @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 increment(String key, long delta) { return stringRedisTemplate.opsForValue().increment(key, delta); } }

UserServiceImpl文件配置

配置UserServiceImpl文件 package com.nmgdz.bigdata.service.impl; import com.nmgdz.bigdata.dao.UserDao; import com.nmgdz.bigdata.entity.User; import com.nmgdz.bigdata.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /** * @auther: xhd * @Date: 2020/9/1/11:12 */ @Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; // @Override // public List<User> queryByAge(int age) { // return userDao.findByAge(age); // } @Override public User save(User user) { return userDao.save(user); } @Override public void deletUserById(int id) { userDao.deleteById(id); } @Override public User queryById(int id) { return userDao.findById(id); } }

RedisService文件配置

配置RedisService文件 package com.nmgdz.bigdata.service; /** * @auther: xhd * @Date: 2020/9/2/0:26 */ public interface RedisService { /** * 存储数据 */ void set(String key, String value); /** * 获取数据 */ String get(String key); /** * 设置超期时间 */ boolean expire(String key, long expire); /** * 删除数据 */ void remove(String key); /** * 自增操作 * * @param delta 自增步长 */ Long increment(String key, long delta); }

UserService文件配置

配置UserService文件 package com.nmgdz.bigdata.service; import com.nmgdz.bigdata.entity.User; import java.util.List; /** * @auther: xhd * @Date: 2020/9/1/11:10 */ public interface UserService { /** * 根据年龄查询用户 * * @param age * @return */ // List<User> queryByAge(int age); /** * 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); }

Swagger2Config文件配置

配置Swagger2Config文件 package com.nmgdz.bigdata.config; 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; /** 作者: xhd 创建时间: 2020/3/13 17:32 版本: V1.0 */ /** * Swagger2API文档的配置 */ @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.nmgdz.bigdata.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("第三次演示") .description("内蒙古电子大数据工坊") .contact("xhd") .version("1.0") .build(); } }

进入浏览器查看

http://localhost:8080/swagger-ui.html#!/user45controller/queryByIdUsingGET

也可以再Postman查看