浅谈MyBatisPlus注解@EnumValue避坑

CREATE TABLE `task` (
  `id` BIGINT PRIMARY KEY AUTO_INCREMENT,
  `work_type` TINYINT NOT NULL,  -- 映射到 WorkType 枚举
  `description` VARCHAR(255)
);

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.29</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.2.8</version>
</dependency>

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;

@Data
@TableName("task")
public class Task {
    @TableId(type = IdType.AUTO)
    private Long id;

    // 数据库字段为 TINYINT，映射到 WorkType 枚举
    @EnumValue
    @TableField("work_type")
    private WorkType workType;

    @TableField("description")
    private String description;
}

import com.baomidou.mybatisplus.annotation.EnumValue;

//显式指定数值
public enum WorkType {
    DEV(0, "开发"),  
    TEST(1, "测试"),
    IT(2, "运维");

    @EnumValue
    private final int workCode; //数据库字段类型为TINYINT
    private final String workDec;

    WorkType(int workCode, String workDec) {
        this.workCode = workCode;
        this.workDec = workDec;
    }

    public String getWorkDec() {
        return workDec;
    }

    //通过数值获取文字描述
    public static WorkType getDescByCode(int value) {
        for (WorkType workType : WorkType.values()) {
            if (workType.workCode == value) {
                return workType;
            }
        }
        return null;
    }
}

import lombok.extern.slf4j.Slf4j;
import org.coffeebeans.enumvalue.Task;
import org.coffeebeans.enumvalue.TaskService;
import org.coffeebeans.enumvalue.WorkType;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

/**
 * <li>ClassName: org.org.coffeebeans.EnumValueTest </li>
 * <li>Author: OakWang </li>
 */
@Slf4j
@SpringBootTest
public class EnumValueTest {

    @Autowired
    private TaskService taskService;

    @Test
    void test1() {
       // 插入操作
       Task task = new Task();
       task.setWorkType(WorkType.IT);  // Java 枚举 → 数据库 TINYINT
       task.setDescription("运维");
       taskService.save(task);
       /*
          执行时间：8 ms，执行SQL：INSERT INTO task  ( work_type, description )  VALUES (  2, '运维'  )
        */
    }

    @Test
    void test2() {
       // 查询操作
       Task result = taskService.getById(1L);
       System.out.println(result.getWorkType().getWorkDec());
       /*
          执行时间：10 ms，执行SQL：SELECT id,work_type AS workType,description FROM task WHERE id=1
          运维
        */
    }

    @Test
    void test3() {
       // 查询操作
       Task result = taskService.getById(1L);
       // 更新操作
       result.setWorkType(WorkType.DEV);
       task.setDescription("开发");
       taskService.updateById(result);
       /*
       执行时间：10 ms，执行SQL：SELECT id,work_type AS workType,description FROM task WHERE id=1
       执行时间：5 ms，执行SQL：UPDATE task  SET work_type=0, description='开发'  WHERE id=1
        */
    }
}