```xml <select id="getSameSchoolCollectYearBatchList" resultMap="BaseResultMap"> select <include refid="Base_Column_List"/> from yjjh_batch <where> school_collect_year = #{schoolCollectYear,jdbcType=VARCHAR} <if test="createTime != null and createTime != ''"> and create_time <![CDATA[ < ]]> #{createTime,jdbcType=TIMESTAMP} </if> <if test="excludeBatchId != null and excludeBatchId != ''"> and batch_id != #{excludeBatchId,jdbcType=VARCHAR} </if> </where> </select> ``` ```java /** * 查询相同学校数据采集年份的批次列表 * * @param schoolCollectYear 学校数据采集年份 * @param createTime 创建时间(小于该时间) * @param excludeBatchId 需要排除的批次主键ID * @return 批次列表 */ List<BatchPO> getSameSchoolCollectYearBatchList(@Param("schoolCollectYear") String schoolCollectYear, @Param("createTime") LocalDateTime createTime, @Param("excludeBatchId") String excludeBatchId); ``` 这个mybatis的方法有什么错误吗?为什么程序会报一下错误? ```text org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.IllegalArgumentException: invalid comparison: java.time.LocalDateTime and java.lang.String ### Cause: java.lang.IllegalArgumentException: invalid comparison: java.time.LocalDateTime and java.lang.String ```
时间: 2024-02-14 17:32:21 浏览: 173
这个错误是因为在MyBatis的mapper接口方法中,参数类型为LocalDateTime的createTime与数据库中的createTime字段类型不匹配。在SQL语句中,你使用了"<"运算符来比较两者的值,但是无法直接比较LocalDateTime类型与String类型的值。
要解决这个问题,你可以将createTime参数的类型改为String,并在SQL语句中使用STR_TO_DATE函数将数据库中的createTime字段转换为DateTime类型进行比较。修改后的代码如下所示:
```java
List<BatchPO> getSameSchoolCollectYearBatchList(@Param("schoolCollectYear") String schoolCollectYear,
@Param("createTime") String createTime,
@Param("excludeBatchId") String excludeBatchId);
```
```xml
<select id="getSameSchoolCollectYearBatchList" resultMap="BaseResultMap">
select
<include refid="Base_Column_List"/>
from yjjh_batch
<where>
school_collect_year = #{schoolCollectYear,jdbcType=VARCHAR}
<if test="createTime != null and createTime != ''">
and create_time <![CDATA[ < ]]> STR_TO_DATE(#{createTime,jdbcType=VARCHAR}, '%Y-%m-%d %H:%i:%s')
</if>
<if test="excludeBatchId != null and excludeBatchId != ''">
and batch_id != #{excludeBatchId,jdbcType=VARCHAR}
</if>
</where>
</select>
```
这样修改后,应该能够解决报错问题。
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