数据库：

PO：重点是autoResultMap = true和@TableField(typeHandler = FastjsonTypeHandler.class)

@Data
@EqualsAndHashCode(callSuper = false)
@TableName(value = "xxx", autoResultMap = true)
@ApiModel("一分钱充值用户配置表")
public class xxx implements Serializable {

@TableField(typeHandler = FastjsonTypeHandler.class)
private List<String> userIds;

查询：

xxxMapper.selectOne(new LambdaQueryWrapper<xxx>().select(xxx::getUserIds));