Mysql json类型字段Java+Mybatis数据字典功能的实践方式

CREATE TABLE `sys_dict` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `code` varchar(30) NOT NULL COMMENT '编码',
  `name` varchar(40) NOT NULL COMMENT '展示名称',
  `content` json NOT NULL COMMENT '内容',
  /* 下面六个字段根据需要增加 */
  `description` varchar(200) DEFAULT NULL COMMENT '描述',
  `deleted` tinyint(1) NOT NULL DEFAULT '0' COMMENT '是否删除 [0未删除 1已删除]',
  `create_by` int(11) DEFAULT NULL COMMENT '创建人',
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `update_by` int(11) DEFAULT NULL COMMENT '修改人',
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='系统字典表';

@Getter
@Setter
@TableName(value = "sys_dict", autoResultMap = true)
@ApiModel("系统字典实体类")
public class SysDict extends BaseDO {

    @TableId(type = IdType.AUTO) //id自增
    private Integer id;

    @ApiModelProperty("编码")
    private String code;

    @ApiModelProperty("名称")
    private String name;

    @TableField(typeHandler = JacksonTypeHandler.class)
    @ApiModelProperty("内容列表")
    private List<DictContent> content;

    @Getter
    @Setter
    @NoArgsConstructor
    @ApiModel("系统字典内容实体类")
    public static class DictContent {

        @ApiModelProperty("键")
        private Integer key;

        @ApiModelProperty("值")
        private String value;

        @ApiModelProperty("排序，数字越小越前面")
        private Integer order;

	    @ApiModelProperty("是否删除 [0:未删除 1:已删除]")
	    private Integer deleted;
		
		//辅助字段根据需求来定，有必要的情况下可以继承BaseDO，增加那6个字段！
    }
}


@Getter
@Setter
public abstract class BaseDO implements Serializable {

    @ApiModelProperty("备注")
    private String description;

    @ApiModelProperty("是否删除 [0:未删除 1:已删除]")
    private Integer deleted;

    @ApiModelProperty("创建人")
    private Integer createBy;

	//JSONFormat是格式化时间的输入输出格式
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", locale = "zh", timezone = "GMT+8")
    @ApiModelProperty("创建时间")
    private LocalDateTime createTime;

    @ApiModelProperty("修改人")
    private Integer updateBy;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", locale = "zh", timezone = "GMT+8")
    @ApiModelProperty("修改时间")
    private LocalDateTime updateTime;

}

<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.copm.ifm.servers.insp.entity.SysDict">
    <id column="id" property="id" />
    <result column="code" property="code" />
    <result column="name" property="name" />
    <!-- 这里显示指定typeHandler属性值 -->
    <result column="content" property="content" 
    		jdbcType="JAVA_OBJECT" javaType="java.util.List"
            typeHandler="com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler"/>
    <result column="description" property="description" />
    <result column="deleted" property="deleted" />
    <result column="create_by" property="createBy" />
    <result column="create_time" property="createTime" />
    <result column="update_by" property="updateBy" />
    <result column="update_time" property="updateTime" />
</resultMap>