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update mybatis-flex-core/src/main/java/com/mybatisflex/core/query/MapperQueryChain.java.

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使用relation关联查询的时候，更多情况下是【目的明确】的只查询某几个关联，所以只需要调用addQueryRelations即可。addIgnoreRelations的这种反向操作不利点是，后续的关系有拓展了，原来使用ignore方式的，会进行不必要的关联查询。

Signed-off-by: 唐振超 <imtzc@qq.com>
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唐振超 2024-02-01 15:53:17 +00:00 committed by Gitee
parent 0817ce4c4b
commit d1f7b67724
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mybatis-flex-core/src/main/java/com/mybatisflex/core/query/MapperQueryChain.java
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@ -18,8 +18,12 @@ package com.mybatisflex.core.query;
import com.mybatisflex.core.BaseMapper;
import com.mybatisflex.core.paginate.Page;
import com.mybatisflex.core.relation.RelationManager;
import com.mybatisflex.core.util.LambdaGetter;
import com.mybatisflex.core.util.LambdaUtil;
import com.mybatisflex.core.util.SqlUtil;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
@ -194,4 +198,19 @@ public interface MapperQueryChain<T> extends ChainQuery<T> {
return new RelationsBuilder<>(this);
}
/**
* 使用 Relations Query 的方式进行关联查询。
* @param columns 需要关联的字段
* @return Relations Query 查询
*/
default RelationsBuilder<T> withRelations(LambdaGetter<T>... columns) {
if(columns != null && columns.length > 0) {
String[] array = Arrays.stream(columns)
.map(LambdaUtil::getFieldName)
.toArray(String[]::new);
RelationManager.addQueryRelations(array);
}
return new RelationsBuilder<>(this);
}
}