在以下查询中添加“ NULLS LAST”时,出现以下异常:


  引起原因:com.microsoft.sqlserver.jdbc.SQLServerException:未为参数编号11设置值。



如果我删除NULLS LAST一切正常
如果我仅通过一个特定的列删除CASE WHEN代码并对其进行排序,则它可以与NULLS LAST一起使用,但是我需要CASE WHEN上的所有列。


    @Query("SELECT c FROM ClassSpecificationTableEntity c"
            + " LEFT JOIN c.owner  o "
            + " LEFT JOIN c.domain d "
            + "WHERE ISNULL(c.classStructure.classification.description, '')    LIKE :SEARCH "
            + "   OR ISNULL(c.classStructure.description, '')                       LIKE :SEARCH "
            + " OR ISNULL(d.description, '')                                            LIKE :SEARCH "
            + " OR ISNULL(o.description, '')                                            LIKE :SEARCH "
            + " OR ISNULL(c.measurementUnit, '')                                    LIKE :SEARCH "
            + " OR ISNULL(c.defaultValue, '')                                       LIKE :SEARCH "
            + " OR ISNULL(c.dataType, '')                                               LIKE :SEARCH "
            + " OR ISNULL(c.tooltip, '')                                                LIKE :SEARCH "
            + " ORDER BY "
            + "  CASE :ORDERBY" +
            "    WHEN 0 THEN c.classStructure.classification.description " +
            "    WHEN 1 THEN c.assetAttribId " +
            "    WHEN 2 THEN c.dataType " +
            "    WHEN 3 THEN c.measurementUnit " +
            "    WHEN 4 THEN c.domain.description " +
            "    WHEN 5 THEN c.owner.description " +
            "    WHEN 6 THEN c.defaultValue " +
            "    WHEN 7 THEN c.tooltip " +
            "    END DESC NULLS LAST"
            )
    Page<ClassSpecificationTableEntity> findByLikeSearchDESC(@Param(value="SEARCH") final String searchCrit, final Pageable pageable, @Param(value="ORDERBY") final String orderBy);

最佳答案

T-SQL没有NULLS LAST语法。

如果要最后排序NULL值,通常的方法是使用CASE表达式或IIF

--CASE Expression
CASE WHEN {expression} IS NULL THEN 1 ELSE 0 END
--IIF funciton (which is actually a shorthand CASE expression)
IIF({Expression} IS NULL, 1, 0)




如果您有一个复杂的表达式,想要最后对NULL值进行排序,然后对表达式进行排序,并且该表达式未出现在SELECT中(因此不能被其别名引用),则可以移动将表达式添加到FROM,以避免多次键入表达式:

FROM ...
     JOIN ...
     LEFT JOIN ...
     ...
     CROSS APPLY (VALUES({Expression}))V(Alias)
WHERE ...
ORDER BY IIF(V.Alias IS NULL,1,0),
         V.Alias

关于java - 最后添加NULLS时的问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/58555658/

10-08 22:52