目录
1.数据库建表
2.项目 ---就是更新del_flag字段为2
(1)pom.xml
(2)Application
(3)applicatiom.yml
(4)entity
(5)mapper
(6)service
(7)service目录下的impl目录
(8)common
(9)enums
(10)config
(11)controller
postman测试
3.彻底删除数据库记录
(11）controller
postman
1.数据库建表
CREATE TABLE `sys_user` (`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',`create_time` datetime DEFAULT NULL COMMENT '创建时间',`update_time` datetime DEFAULT NULL COMMENT '修改时间',`del_flag` tinyint(1) DEFAULT '1' COMMENT '删除状态：1正常/2删除',`user_id` varchar(255) DEFAULT NULL COMMENT '用户id',`user_name` varchar(255) DEFAULT NULL COMMENT '用户名称',PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=14 DEFAULT CHARSET=utf8mb4 ROW_FORMAT=DYNAMIC COMMENT='用户信息';2.项目 ---就是更新del_flag字段为2
(1)pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><!--它是 Spring Boot 应用程序的父项目,可以继承 Spring Boot 的默认参数、默认配置和依赖管理，简化了项目的构建和配置工作。--><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.5.RELEASE</version></parent><groupId>org.example</groupId><artifactId>mybatisplus1</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><!--依赖版本控制--><lombok.version>1.18.16</lombok.version><mybatis-plus.version>3.4.1</mybatis-plus.version><druid.version>1.1.23</druid.version></properties><dependencies><!--spring boot相关依赖--><!--这个依赖项是 Spring Boot 的核心依赖，它包含了一系列常用的 Spring Boot 模块和库。这个依赖项主要用于构建 Spring Boot 应用程序，它封装了许多常用的配置和依赖项，使得开发者可以更快速地搭建和启动一个基于 Spring Boot 的项目。--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><!--是用于编写测试代码的 Spring Boot 依赖项，它包含了一些常用的测试框架和工具。这个依赖项的 scope 被设为 test，表示这些依赖项仅在测试阶段需要使用，不会被包含到最终的构建结果中。--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--这个依赖项是用于开发基于 Spring Boot 的 Web 应用程序的。它提供了一些基本的依赖项和配置，以帮助你快速搭建一个 Web 应用程序。--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><scope>compile</scope></dependency><!--Lombok 是一个开发工具，可以通过注解自动化生成 Java 代码中的一些样板代码，如 getter、setter、构造函数等，减少了编写冗余代码的工作量。--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version></dependency><!--连接数据库--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!--Druid是一个开源的数据库连接池和监控框架，可以提供高性能、可扩展和可跟踪的数据库访问功能。Druid还提供了丰富的监控和统计功能，可以对数据库连接、执行SQL、慢查询等进行监控和统计。--><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>${druid.version}</version></dependency><!--mybatis plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatis-plus.version}</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><!-- 指定该Main Class为全局的唯一入口 这里是启动类的地址 --><mainClass>com.lpc.Application</mainClass><layout>ZIP</layout><includeSystemScope>true</includeSystemScope></configuration><executions><execution><goals><goal>repackage</goal><!--可以把依赖的包都打包到生成的Jar包中--></goals></execution></executions></plugin></plugins></build></project>(2)Application
package com.lpc;import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @Author lpc* @Date 2024 01 11 11 38**/
@SpringBootApplication
@Slf4j
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class,args);log.info("项目启动成功......");}
}
(3)applicatiom.yml
server:port: 8888
spring:#连接数据库datasource:druid:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatisplus_db?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=trueusername: rootpassword: lpc123456
mybatis-plus:configuration:#在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射map-underscore-to-camel-case: truelog-impl: org.apache.ibatis.logging.stdout.StdOutImplglobal-config:db-config:id-type: ASSIGN_ID(4)entity
package com.lpc.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.springframework.format.annotation.DateTimeFormat;
import java.io.Serializable;
import java.util.Date;/*** @Author lpc* @Date 2024 01 11 14 08**/
@Data
@EqualsAndHashCode(callSuper = false)
public class SysUser implements Serializable {/*** 主键*/@TableId(value = "id", type = IdType.AUTO)private Integer id;/*** 创建时间*/@JsonFormat(timezone = "GMT+8",pattern = "yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@TableField(fill = FieldFill.INSERT)private Date createTime;/*** 更新时间*/@JsonFormat(timezone = "GMT+8",pattern = "yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@TableField(fill = FieldFill.INSERT_UPDATE)private Date updateTime;/*** 删除状态默认1正常/2删除*/private Integer delFlag;/*** 用户id*/private String userId;/*** 用户名称*/private String userName;}
(5)mapper
package com.lpc.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.lpc.entity.SysUser;
import org.apache.ibatis.annotations.Mapper;/*** @Author lpc* @Date 2024 01 11 14 19**/
@Mapper
public interface SysUserMapper extends BaseMapper<SysUser> {
}
(6)service
package com.lpc.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.lpc.entity.SysUser;/*** @Author lpc* @Date 2024 01 11 14 20**/
public interface SysUserService extends IService<SysUser> {
}
(7)service目录下的impl目录
package com.lpc.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lpc.entity.SysUser;
import com.lpc.mapper.SysUserMapper;
import com.lpc.service.SysUserService;
import org.springframework.stereotype.Service;/*** @Author lpc* @Date 2024 01 11 14 21**/
@Service
public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> implements SysUserService {
}
(8)common
package com.lpc.common;import com.fasterxml.jackson.annotation.JsonIgnore;
import com.lpc.enums.CodeEnum;
import lombok.Data;import java.io.Serializable;/*** 接口返回数据格式* @author scott*/
@Data
public class Result<T> implements Serializable {private static final long serialVersionUID = 1L;/*** 成功标志*/private boolean success = true;/*** 返回处理消息*/private String message = "操作成功！";/*** 返回代码*/private Integer code = 0;/*** 返回数据对象 data*/private T result;//返回数据private T data;/*** 时间戳*/private long timestamp = System.currentTimeMillis();public Result(Integer code, String message, T result) {this.code=code;this.message=message;this.result=result;}public Result() {}public Result<T> success(String message) {this.message = message;this.code = CodeEnum.SUCCESS.getCode();this.success = true;return this;}@Deprecatedpublic static Result<Object> ok() {Result<Object> r = new Result<Object>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setMessage("成功");return r;}@Deprecatedpublic static Result<Object> ok(String msg) {Result<Object> r = new Result<Object>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setMessage(msg);return r;}@Deprecatedpublic static Result<Object> ok(Object data) {Result<Object> r = new Result<Object>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setResult(data);return r;}public static<T> Result<T> OK() {Result<T> r = new Result<T>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setMessage("成功");return r;}public static<T> Result<T> OK(T data) {Result<T> r = new Result<T>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setResult(data);return r;}public static<T> Result<T> OK(String msg, T data) {Result<T> r = new Result<T>();r.setSuccess(true);r.setCode(CodeEnum.SUCCESS.getCode());r.setMessage(msg);r.setResult(data);return r;}public static Result error(String msg) {return error(CodeEnum.FAILURE.getCode(), msg);}public static Result<Object> error(int code, String msg) {Result<Object> r = new Result<Object>();r.setCode(code);r.setMessage(msg);r.setSuccess(false);return r;}public Result<T> error500(String message) {this.message = message;this.code = CodeEnum.FAILURE.getCode();this.success = false;return this;}@JsonIgnoreprivate String onlTable;}
(9)enums
package com.lpc.enums;/*** @ClassName CodeEnum* @Description 状态码*/
public enum CodeEnum {/*** 处理成功*/SUCCESS(200, "成功"),/*** 处理失败*/FAILURE(422, "处理失败"),/*** 处理失败*/PERMISSION_DENIED(403, "权限不足"),/*** 门户二维码轮训请求:未登录成功*/QR_LOGIN_NOT_SUCCESS(1000, "未登录成功"),/*** 门户二维码轮训请求:二维码已过期*/QR_LOGIN_OVERDUE(1001, "二维码已过期,请重新刷新"),/*** 全局异常*/ERROR_1002(1002, "服务器错误，请联系管理员"),/*** 缺少必要参数*/ERROR_1004(1004, "缺少必要参数"),/*** 参数类型错误*/ERROR_1005(1005, "参数类型错误"),/*** 日期转换异常*/ERROR_1006(1006, "日期格式错误"),/*** 没有权限，请联系管理员授权*/SC_JEECG_NO_AUTHZ(510, "没有权限，请联系管理员授权"),/*** 数据库中已存在该记录*/ERROR_1007(1007, "数据库中已存在该记录"),/*** 路径不存在，请检查路径是否正确*/ERROR_404(404, "路径不存在，请检查路径是否正确"),/*** token失效*/ERROR_1008(1008, "Token失效，请重新登录！"),/*** 用户不存在*/ERROR_1009(1009, "用户不存在"),/*** 账号锁定*/ERROR_1010(1010, "账号锁定"),/*** 指纹登录轮训请求,未登录成功*/FINGERPRINT_LOGIN_NOT_SUCCESS(1011, "未登录成功");private final Integer code;private final String msg;CodeEnum(Integer code, String msg) {this.code = code;this.msg = msg;}public Integer getCode() {return code;}public String getMsg() {return msg;}/*** 根据 value 值反推 GlobalError** @param value* @return*/public static CodeEnum valueOf(int value) {for (CodeEnum right : CodeEnum.values()) {if (value == right.code) {return right;}}return null;}}
(10)config
package com.lpc.config;import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;import java.util.Date;/*** @Author lpc* @Date 2024 01 11 14 14***/
@Component
@Slf4j
public class MybatisPlusConfig implements MetaObjectHandler {/*** 公共字段操作* 插入的时候进行操作的两个字段createTime，updateTime （自动）*/@Overridepublic void insertFill(MetaObject metaObject) {this.strictInsertFill(metaObject, "createTime", Date::new, Date.class);this.strictUpdateFill(metaObject, "updateTime", Date::new, Date.class);}/***公共字段操作* 修改更新的时候只操作updateTime这个字段（自动）*/@Overridepublic void updateFill(MetaObject metaObject) {this.strictUpdateFill(metaObject, "updateTime", Date::new, Date.class);}/*** 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)*/@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));return interceptor;}}
(11)controller
package com.lpc.controller;import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.lpc.common.Result;
import com.lpc.entity.SysUser;
import com.lpc.service.SysUserService;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;import java.util.List;/*** @Author lpc* @Date 2024 01 11 14 23**/
@RequestMapping("/lpc/user")
@RequiredArgsConstructor
@RestController
public class SysUserController {private final SysUserService userService;/*** 路径：localhost:8888/lpc/user/delete*/@PostMapping("/delete")public Result<SysUser> delete(@RequestBody SysUser sysUser){userService.update(Wrappers.lambdaUpdate(SysUser.class).eq(SysUser::getId,sysUser.getId()).set(SysUser::getDelFlag,2));return Result.OK();}}
postman测试
3.彻底删除数据库记录
(11）controller
package com.lpc.controller;import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.lpc.common.Result;
import com.lpc.entity.SysUser;
import com.lpc.service.SysUserService;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;import java.util.List;/*** @Author lpc* @Date 2024 01 11 14 23**/
@RequestMapping("/lpc/user")
@RequiredArgsConstructor
@RestController
public class SysUserController {private final SysUserService userService;/*** 彻底删除记录* 路径：localhost:8888/lpc/user/delete2*/@PostMapping("/delete2")public Result<SysUser> delete2(Integer id){userService.removeById(id);return Result.OK();}}
postman
