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在VB程序中格式化SQL字符串
在写SQL语句时,需要对不同类型的数据分别加上#号,""号等来表示,用以下函数,就可以实现操作的简化.不管是什么类型,只需用这个Q函数转化一下,不需动手加格式化符号,就OK了.实在是方便.本人一直在用它,实在是方便.
Function Q(ByVal SqlVariable As Variant) As String
'-----------------------------------------
' Notes: Useful in creating properly formatted SQL statements
' Usage: sql="select * from table where name= " & Q(vntName)
' 这个版本格式化适用于Access的变量，若支持其它数据库或许需要对其进行修改
'-----------------------------------------
On Error GoTo ErrTrap
Q = SqlVariable
'format the string
Select Case VarType(SqlVariable)
Case vbNull, vbEmpty
Q = "NULL"
Case vbString
Q = "'" & Replace(SqlVariable, "'", "''") & "'"
'date variable
Case vbDate
'format and enclose in pounds signs for Access
Q = "#" & Format$(SqlVariable, "general date") & "#"
'otherwise treat as numeric
Case Else
On Error Resume Next
Q = CStr(SqlVariable)
If Err.Number <> 0 Then Q = SqlVariable
End Select
Exit Function
ErrTrap:
On Error GoTo 0
End Function 
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