在 If 语句中使用 Like “*” 运算符

Question

我正在尝试基于四个组合框创建一个过滤器，这些组合框过滤子表单中的记录。 问题是，组合框上的 RowSource 列表中的一个值在基本查询中不存在。 该值是“ All ”。 我计划在所有组合框AfterUpdate事件上使用相同的代码。 请参阅下面的方法和必要的建议。 我目前在Me.Combobox1.Value = "Like "*""上遇到类型不匹配错误

If IsNull(Me.combo1.Value) Or IsNull(Me.combo2.Value) Or IsNull(Me.combo3.Value) Or 
IsNull(Me.combo4.Value) Then
Exit Sub
End If

If Not IsNull(Me.combo1.Value) Or Not IsNull(combo2.Value) Or Not IsNull(combo3.Value) Or Not 
IsNull(combo4.Value) Then

If Me.combo1 = "All" Then
Me.combo1.Value = "Like " * ""
ElseIf Me.combo2.Value = "All" Then
Me.combo2.Value = "Like " * ""
ElseIf Me.combo3.Value = "All" Then
Me.combo3.Value = "Like " * ""
ElseIf Me.combo4.Value = "All" Then
Me.combo4.Value = "Like " * ""

Task1 = "SELECT * FROM qryBase WHERE [Quarter] = '" & Me.combo1.Value & "' AND [CurrentArea] = '" & 
Me.combo2.Value & "' AND [CurrentStatus] = '" & Me.combo3.Value & "' AND [MainUser] = '" & 
Me.combo4.Value & "'"

End If

End If

Answer 1

照原样，您的查询无法正常工作，因为LIKE旨在替换条件语句中的= 。 但是，没有通配符的LIKE的行为类似于= 。 因此，将LIKE运算符放在 SQL 语句中。

Dim cbo1, cbo2, cbo3, cbo4 As String
...
If Me.combo1 = "All" Then
    cbo1 = "*"
ElseIf Me.combo2.Value = "All" Then
    cbo2 = "*"
ElseIf Me.combo3.Value = "All" Then
    cbo3 = "*"
ElseIf Me.combo4.Value = "All" Then
    cbo4 = "*"
End If

Task1 = "SELECT * FROM qryBase WHERE [Quarter] LIKE '" & cbo1 & "'" _
         & " AND [CurrentArea] LIKE '" & cbo2 & "'" _
         & " AND [CurrentStatus] LIKE '" & cbo3 & "'" _
         & " AND [MainUser] LIKE '" & cbo4 & "'"

Me.frmDatasheet.Form.Recordsource = Task1
Me.frmDatasheet.Form.Requery

但是，因为组合框可以有撇号，所以考虑参数化以避免需要将 VBA 值直接连接到 SQL 中，但将它们绑定为参数：

Dim qdef As QueryDef
Dim rst As Recordset
Dim sql AS String
Dim cbo1, cbo2, cbo3, cbo4 As String

sql = "PARAMETERS cbo1 TEXT, cbo2 TEXT, cbo3 TEXT, cbo4 TEXT;" _
        & "SELECT * FROM qryBase WHERE [Quarter] LIKE [cbo1]" _
        & " AND [CurrentArea] LIKE [cbo2]" _
        & " AND [CurrentStatus] LIKE [cbo3]" _
        & " AND [MainUser] LIKE [cbo4]"

If Me.combo1 = "All" Then
    cbo1 = "*"
ElseIf Me.combo2.Value = "All" Then
    cbo2 = "*"
ElseIf Me.combo3.Value = "All" Then
    cbo3 = "*"
ElseIf Me.combo4.Value = "All" Then
    cbo4 = "*"
End If

' INITIALIZE QUERY OBJECT
Set qdef = CurrentDb.CreateQueryDef("", sql)
' Set qdef = CurrentDb.QueryDefs("mySavedParamQuery")

' BIND PARAMS
qdef!cbo1 = cbo1
qdef!cbo2 = cbo2
qdef!cbo3 = cbo3
qdef!cbo4 = cbo4

' SET FORM RECORDSET TO EXECUTED QUERY 
Set rst = qdef.OpenRecordset()    
Set Me.frmDatasheet.Form.Recordset = rst

Set rst = Nothing: Set qdef = Nothing