TableAdapter中的IIF查询语句出错

Question

嗨抱歉英语不好

我在.mdb格式的访问数据库中有3个表 - 我在vs 2010中使用此数据库作为数据源。 我有一个TableAdapter与以下填充查询（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，在访问时工作正常，但在vs表适配器中出现以下错误：

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

同时我看到结果用0代替空值，这意味着IIF语句工作正常。

但我需要表适配器来填充由于错误而不会发生的表。 我该怎么办 ？

提前致谢

Answer 1

找到它：D

只需手动创建表中的列。 无论您是在数据网格还是报表中使用它，它都会起作用。 只需确保查询中的列名与表中的列名匹配即可。