使用mybatisplus查询sql时，报Error attempting to get column ‘ID‘ from result set错误

__三境大剑仙__2023-09-05 14:12

问题描述：

在使用如下代码进行查询时，报Error attempting to get column 'ID' from result set错误：

java 复制代码

 LambdaQueryWrapper<TimeFeature> wrapper = new LambdaQueryWrapper<>();
 wrapper.eq(TimeFeature::getDate, currentDateTime);
 TimeFeature timeFeature = timeFeatureMapper.selectOne(wrapper);

首先排除数据库字段大小写问题。

然后考虑ID字段在本轮逻辑中不是很重要，对代码做了如下更改，指定了查询字段：

java 复制代码

LambdaQueryWrapper<TimeFeature> wrapper = new LambdaQueryWrapper<>();
wrapper.select(TimeFeature::getDate,TimeFeature::getDayType5)
.eq(TimeFeature::getDate, currentDateTime);
TimeFeature timeFeature = timeFeatureMapper.selectOne(wrapper);

结果查询正常，然后能得出结果集到实体类的映射过程出现问题。

然后通过排查代码，发现我的实体类使用了@AllArgsConstructor注解，

java 复制代码

@Data
@TableName("TIME_FEATURE")
@ApiModel(value = "TimeFeature对象", description = "日期类型映射")
@AllArgsConstructor
public class TimeFeature extends BaseEntity{

    @ApiModelProperty("日期")
    private LocalDateTime date;

    @ApiModelProperty("类型")
    private Integer dayType5;

}

这个注解导致了指定的默认构造方法是只包含date，dayType5两个参数的方法。所以无法通过默认的构造方法将对应的结果集映射到实体类。

所以将这个注解去掉就解决问题了。

引申思考，那使用@Builder注解会不会导致类似的问题呢？