实体类的属性是普通枚举 EnumValue

当我们的字段有枚举的时候。 记住要加上 @EnumValue注解，帮我们转换，否则会报错 错误如下：

Caused by: java.sql.SQLException: Incorrect integer value: 'ADD' for column 'type' at row 1

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 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package com.baomidou.mybatisplus.annotation;

import java.lang.annotation.*;

/**
 * 支持普通枚举类字段, 只用在enum类的字段上
 * <p>当实体类的属性是普通枚举，且是其中一个字段，使用该注解来标注枚举类里的那个属性对应字段</p>
 * <p>
 * 使用方式参考 com.baomidou.mybatisplus.test.h2.H2StudentMapperTest
 * <pre>
 * &#64;TableName("student")
 * class Student {
 *     private Integer id;
 *     private String name;
 *     private GradeEnum grade;//数据库grade字段类型为int
 * }
 *
 * public enum GradeEnum {
 *     PRIMARY(1,"小学"),
 *     SECONDORY("2", "中学"),
 *     HIGH(3, "高中");
 *
 *     &#64;EnumValue
 *     private final int code;
 *     private final String descp;
 * }
 * </pre>
 * </p>
 *
 * @author yuxiaobin
 * @date 2018/8/30
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.ANNOTATION_TYPE})
public @interface EnumValue {

}