Question

我的数据库中有一个“搜索”表单，它接收一个字符串，将其分解为一个数组并根据选定的连接类型（“Or”，“And”或“Exact Phrase”收音机）构建一个SQL字符串纽扣）。我的代码在95％的时间内完美运行，但是当我在不同的连接类型和requery之间切换时，每次和数据库都会挂起。我已经确认SQL正在被正确创建，我认为问题源于尝试在子窗体仍在加载时更改子窗体的记录源。

我的搜索表单的确切工作方式如下：

用户将搜索字词/词组放在文本框中
在文本框的“更新后”事件中，VBA创建一个SQL字符串并将其存储在隐藏文本字段中（称为“ModifiedSearchValue”）
如果用户更改了连接类型（带有“Or”，“And”或“Exact Phrase”选项的单选按钮），则组中的“After Update”事件将唤起VBA sub（如＃2中所示）并且VBA创建它存储在隐藏文本字段中的SQL字符串（称为“ModifiedSearchValue”）
当用户点击“搜索”按钮时，VBA将子窗体的RecordSource设置为“ModifiedSearchValue”的值：

我！Results.Form.RecordSource = Me.ModifiedSearchValue

同样，这在大多数情况下都能正常运行，但是如果输入搜索词，请单击“搜索”，然后更改连接类型并再次点击“搜索”，这会导致数据库挂起大约5％的时间

我的主要VBA代码如下

    Private Sub SearchString()
Dim SearchString, SearchStringTitle, SearchStringName, SearchStringDescription, SearchStringInvestigator, JoinValue, j, SQLString As String, SearchArray, varValue As Variant

    SearchString = Trim(Me.SearchValue)

    If Not IsNull(SearchString) Then
        SearchArray = Split(SearchString, " ")

        SQLString = "SELECT tbl_Studies.StudyID, tbl_Studies.Study_Short_Title, tbl_Studies.Study_Name, tbl_Studies.Study_Description, [qry_General:FullName_FMLD].FullName AS Investigator, tbl_Studies.Project_Type, IIf([Project_Type]=1,[tbl_Studies:Status]![Status],[tbl_Studies:NR_Status]![NR_Status]) AS Overall_Status, tbl_Studies.Date_Submitted, tbl_Studies.Date_Updated, tbl_Studies.Results_Summary, tbl_Studies.Inactive " & _
                    "FROM ([tbl_Studies:NR_Status] RIGHT JOIN ([tbl_Studies:Status] RIGHT JOIN tbl_Studies ON [tbl_Studies:Status].StatusID = tbl_Studies.Status) ON [tbl_Studies:NR_Status].NR_StatusID = tbl_Studies.NR_Status) LEFT JOIN [qry_General:FullName_FMLD] ON tbl_Studies.Investigator = [qry_General:FullName_FMLD].PersonID " & _
                    "WHERE "

        If Me.Join_Type <> 3 Then

            If Me.Join_Type = 1 Then
                JoinValue = "OR"
            ElseIf Me.Join_Type = 2 Then
                JoinValue = "AND"
            Else
                JoinValue = " "
            End If

    '--
            SearchStringTitle = "(("
            For Each varValue In SearchArray
                j = Trim(varValue)
                SearchStringTitle = SearchStringTitle & "(tbl_Studies.Study_Short_Title) Like ""*" & j & "*"""

                If varValue <> SearchArray(UBound(SearchArray)) Then
                    SearchStringTitle = SearchStringTitle & " " & JoinValue & " "
                End If
            Next varValue
            SearchStringTitle = SearchStringTitle & "))"

    '--
            SearchStringName = "(("
            For Each varValue In SearchArray
                j = Trim(varValue)
                SearchStringName = SearchStringName & "(tbl_Studies.Study_Name) Like ""*" & j & "*"""

                If varValue <> SearchArray(UBound(SearchArray)) Then
                    SearchStringName = SearchStringName & " " & JoinValue & " "
                End If
            Next varValue
            SearchStringName = SearchStringName & "))"

    '--
            SearchStringDescription = "(("
            For Each varValue In SearchArray
                j = Trim(varValue)
                SearchStringDescription = SearchStringDescription & "(tbl_Studies.Study_Description) Like ""*" & j & "*"""

                If varValue <> SearchArray(UBound(SearchArray)) Then
                    SearchStringDescription = SearchStringDescription & " " & JoinValue & " "
                End If
            Next varValue
            SearchStringDescription = SearchStringDescription & "))"

    '--
            SearchStringInvestigator = "(("
            For Each varValue In SearchArray
                j = Trim(varValue)
                SearchStringInvestigator = SearchStringInvestigator & "([qry_General:FullName_FMLD].FullName) Like ""*" & j & "*"""

                If varValue <> SearchArray(UBound(SearchArray)) Then
                    SearchStringInvestigator = SearchStringInvestigator & " " & JoinValue & " "
                End If
            Next varValue
            SearchStringInvestigator = SearchStringInvestigator & "))"

            SearchString = SearchStringTitle & " OR " & SearchStringName & " OR " & SearchStringDescription & " OR " & SearchStringInvestigator
        Else
            SearchStringTitle = "(((tbl_Studies.Study_Short_Title) Like ""*" & SearchString & "*""))"
            SearchStringName = "(((tbl_Studies.Study_Name) Like ""*" & SearchString & "*""))"
            SearchStringInvestigator = "((([qry_General:FullName_FMLD].FullName) Like ""*" & SearchString & "*""))"
            SearchStringDescription = "(((tbl_Studies.Study_Description) Like ""*" & SearchString & "*""))"

            SearchString = SearchStringTitle & " OR " & SearchStringName & " OR " & SearchStringDescription & " OR " & SearchStringInvestigator
        End If

        SearchString = SQLString & SearchString & ";"

        Me.ModifiedSearchValue.Value = SearchString
    End If
End Sub

同样，我的理论是悬挂是在完成从上一次搜索加载之前更改子窗体的RecordSource引起的，但我似乎无法确定任何解决方法。

提前感谢所有见解/帮助！

Answer 1

根据Olivier的建议，问题的真正原因是VBA被称为查询的一部分[qry_General:FullName_FMLD];切换到[qry_General:FullName_FML]（不调用任何VBA）消除了所有问题。我猜测问题的根源是表单在查询返回结果之前尝试应用过滤器，从而创建了一个损坏的过滤字符串。

以下是使用过滤方法更新的代码并用点替换所有刘海：

Private Sub Search_Click()
    On Error GoTo Err_Search_Click

    Dim SearchString, SearchStringTitle, SearchStringName, SearchStringDescription, SearchStringInvestigator, JoinValue, j, SQLString As String, SearchArray, varValue As Variant

        Me.Results.Form.FilterOn = True
        SearchString = Trim(Me.SearchValue)

        If Not IsNull(SearchString) Then
            SearchArray = Split(SearchString, " ")

            If Me.Join_Type <> 3 Then

                If Me.Join_Type = 1 Then
                    JoinValue = "OR"
                ElseIf Me.Join_Type = 2 Then
                    JoinValue = "AND"
                Else
                    JoinValue = " "
                End If

        '--
                SearchStringTitle = "(("
                For Each varValue In SearchArray
                    j = Trim(varValue)
                    SearchStringTitle = SearchStringTitle & "(tbl_Studies.Study_Short_Title) Like ""*" & j & "*"""

                    If varValue <> SearchArray(UBound(SearchArray)) Then
                        SearchStringTitle = SearchStringTitle & " " & JoinValue & " "
                    End If
                Next varValue
                SearchStringTitle = SearchStringTitle & "))"

        '--
                SearchStringName = "(("
                For Each varValue In SearchArray
                    j = Trim(varValue)
                    SearchStringName = SearchStringName & "(tbl_Studies.Study_Name) Like ""*" & j & "*"""

                    If varValue <> SearchArray(UBound(SearchArray)) Then
                        SearchStringName = SearchStringName & " " & JoinValue & " "
                    End If
                Next varValue
                SearchStringName = SearchStringName & "))"

        '--
                SearchStringDescription = "(("
                For Each varValue In SearchArray
                    j = Trim(varValue)
                    SearchStringDescription = SearchStringDescription & "(tbl_Studies.Study_Description) Like ""*" & j & "*"""

                    If varValue <> SearchArray(UBound(SearchArray)) Then
                        SearchStringDescription = SearchStringDescription & " " & JoinValue & " "
                    End If
                Next varValue
                SearchStringDescription = SearchStringDescription & "))"

        '--
                SearchStringInvestigator = "(("
                For Each varValue In SearchArray
                    j = Trim(varValue)
                    SearchStringInvestigator = SearchStringInvestigator & "([qry_General:FullName_FML].FullName) Like ""*" & j & "*"""

                    If varValue <> SearchArray(UBound(SearchArray)) Then
                        SearchStringInvestigator = SearchStringInvestigator & " " & JoinValue & " "
                    End If
                Next varValue
                SearchStringInvestigator = SearchStringInvestigator & "))"

                SearchString = SearchStringTitle & " OR " & SearchStringName & " OR " & SearchStringDescription & " OR " & SearchStringInvestigator
            Else
                SearchStringTitle = "(((tbl_Studies.Study_Short_Title) Like ""*" & SearchString & "*""))"
                SearchStringName = "(((tbl_Studies.Study_Name) Like ""*" & SearchString & "*""))"
                SearchStringInvestigator = "((([qry_General:FullName_FML].FullName) Like ""*" & SearchString & "*""))"
                SearchStringDescription = "(((tbl_Studies.Study_Description) Like ""*" & SearchString & "*""))"

                SearchString = SearchStringTitle & " OR " & SearchStringName & " OR " & SearchStringDescription & " OR " & SearchStringInvestigator
            End If

            Me.Results.Form.Filter = SearchString
        End If

    Exit_Search_Click:
        Exit Sub

    Err_Search_Click:
        MsgBox ("There are no active records to review.")
        Resume Exit_Search_Click
End Sub

同样，此解决方案的功劳属于Olivier Jacot-Descombes - 感谢您的所有帮助和建议！

Access从VBA中设置为SQL的子表单记录源挂起

1 个答案: