TableAdapter 中的 IIF 查询语句出错

Question

你好，抱歉英语不好

我在 .mdb 格式的访问数据库中有 3 个 tables - 我在 vs 2010 中使用这个数据库作为数据源。我有一个带有以下填充查询的 TableAdapter（连接是 MS Jet 4.0）：

 SELECT        a.ID AS AmelID, a.NamAmel, a.MoshtariRef, a.ShHesab, a.Kod, a.NamF, a.NamSM, derivedtbl_1.MablaghKol, derivedtbl_1.Cnt, iif(derivedtbl_2.MablaghKolBrg is Null, 0,derivedtbl_2.MablaghKolBrg) As MablaghKolBrg, iif(derivedtbl_2.CntKolBrg is Null, 0,derivedtbl_2.CntKolBrg) As CntBrg,
iif(derivedtbl_3.MablaghKolVsl is Null, 0,derivedtbl_3.MablaghKolVsl) As MablaghKolVsl,iif(derivedtbl_3.CntVsl is Null, 0,derivedtbl_3.CntVsl) As CntVsl 
FROM            ((((SELECT        Amel.ID, Amel.NamAmel, Chek.MoshtariRef, Chek.ShHesab, Moshtari.Kod, Moshtari.NamF, Moshtari.NamSM
                                FROM            ((Amel INNER JOIN
                                                         Chek ON Amel.ID = Chek.ID) INNER JOIN
                                                         Moshtari ON Amel.ID = Moshtari.AmelRef)
                                GROUP BY Amel.ID, Amel.NamAmel, Chek.MoshtariRef, Chek.ShHesab, Moshtari.Kod, Moshtari.NamF, Moshtari.NamSM) a LEFT OUTER JOIN
                             (SELECT        SUM(Mablagh) AS MablaghKolVsl, COUNT(Mablagh) AS CntVsl, MoshtariRef, ShHesab
                                FROM            Chek Chek_3
                                WHERE        (Status = '1')
                                GROUP BY MoshtariRef, ShHesab) derivedtbl_3 ON a.MoshtariRef = derivedtbl_3.MoshtariRef AND a.ShHesab = derivedtbl_3.ShHesab) LEFT OUTER JOIN
                             (SELECT        SUM(Mablagh) AS MablaghKol, COUNT(Mablagh) AS Cnt, MoshtariRef, ShHesab
                                FROM            Chek Chek_1
                                GROUP BY MoshtariRef, ShHesab) derivedtbl_1 ON a.MoshtariRef = derivedtbl_1.MoshtariRef AND a.ShHesab = derivedtbl_1.ShHesab) LEFT OUTER JOIN
                             (SELECT        SUM(Mablagh) AS MablaghKolBrg, COUNT(Mablagh) AS CntKolBrg, MoshtariRef, ShHesab
                                FROM            Chek Chek_2
                                WHERE        (Status = '2')
                                GROUP BY MoshtariRef, ShHesab) derivedtbl_2 ON a.ShHesab = derivedtbl_2.ShHesab AND a.MoshtariRef = derivedtbl_2.MoshtariRef)

为了避免获得 Null 值，我在最后 4 列中创建了一个 IIF 语句，该语句在访问时工作正常，但在 vs table 适配器中出现以下错误：

Error in list of function arguments: 'IS' not recognized.
Unable to parse query text.

同时我看到结果为 0 而不是空值，这意味着 IIF 语句工作正常。

但我需要 table 适配器来填充 tables 但由于错误而没有发生。我该怎么办？

提前致谢

Answer 1

找到了:D

只需在 table 中手动创建列。无论您是在数据网格还是报告中使用它，它都会起作用。只需确保查询中的列名与 table.

中的列名匹配

TableAdapter 中的 IIF 查询语句出错

Error in IIF Statement of Query within TableAdapter

mysql

sql

ms-access

dataset

visual-studio-2010