Question

是否可以编写与此SQL相当的Querydsl？

SELECT coalesce(m.MATERIAL_GROUP, sc.MATERIAL_ID) AS GROUP_ID FROM STOCK_CARD sc JOIN MATERIAL m ON (sc.MATERIAL_ID = m.ID) GROUP BY GROUP_ID;

在Querydsl中我尝试过（stockCard是静态导入的）：

public List<Long> justAnExample() {
    NumberPath<Long> group_id = Expressions.numberPath(Long.class, "group_id");
    return from(stockCard)
            .groupBy(group_id)
            .list(stockCard.material.materialGroup.id.coalesce(stockCard.material.id).as(group_id));
}

但似乎Querydsl忽略了“as（）”，因为生成的SQL是：

select coalesce(material1_.MATERIAL_GROUP, stockcard0_.MATERIAL_ID) as col_0_0_ from STOCK_CARD stockcard0_, MATERIAL material1_ where stockcard0_.MATERIAL_ID=material1_.id group by group_id

请注意，这只是一个非常简化的查询，可以尝试是否可行。谢谢！

Answer 1

这可能与此Hibernate错误https://hibernate.atlassian.net/browse/HHH-1902

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Querydsl选择一些东西作为something_else

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