需要频繁判断记录在表中是否存在,可以自定义一个“记录是否存在”函数,减少工作量。
单条件记录在表中是否存在,用下面自定义函数:
Function RecordExists1(sTbName1 As String, SFdName1 As String, sRecordValue1 As String) As Boolean
'sTbName1 要查找的表名
'SFdName1 要查找的字段名
'sRecordValue1 要查找的记录值
RecordExists1 = False
SFdName1 = "[" & SFdName1 & "]"
sRecordValue1 = "'" & sRecordValue1 & "'"
If DCount(SFdName1, sTbName1, SFdName1 & " = " & sRecordValue1) > 0 Then
RecordExists1 = True
End If
End Function
两个条件的记录在表中是否存在,用下面自定义函数:
Function RecordExists2(sTbName1 As String, SFdName1 As String, SFdName2 As String, sRecordValue1 As String, sRecordValue2 As String) As Boolean
'sTbName1 要查找的表名
'SFdName1 要查找的字段名1
'SFdName2 要查找的字段名2
'sRecordValue1 要查找的记录值1
'sRecordValue2 要查找的记录值2
RecordExists2 = False
SFdName1 = "[" & SFdName1 & "]"
SFdName2 = "[" & SFdName2 & "]"
sRecordValue1 = "'" & sRecordValue1 & "'"
sRecordValue2 = "'" & sRecordValue2 & "'"
If DCount(SFdName1, sTbName1, SFdName1 & " = " & sRecordValue1 & "AND" & SFdName2 & " = " & sRecordValue2) > 0 Then
RecordExists2 = True
End If
End Function
应用示例:
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图 示: