在 SqlDataSource 中使用输出参数

Question

我正在检索 db 条目的 scope_identity，并且我想在不同的 SqlDataSource 中使用该变量，主要用作但我无法访问该变量。 我将变量显示在 msgbox 中，并且显示正确，我只是不确定如何在 SqlDataSource 中访问它。这是我的代码；

这是插入第一个信息并接收到scope_identity，以及_inserted事件的数据源； 代码：

<asp:SqlDataSource ID="InsertPatientInfo" runat="server" ConnectionString="<%$ ConnectionStrings:DataConnectionString %>"
providername="<%$ ConnectionStrings:DataConnectionString.ProviderName %>"
    InsertCommandType="StoredProcedure"
    InsertCommand = "InsertPatInfo"
    OnInserted="InsertPatientInfo_Inserted">
    <InsertParameters>
        <asp:ControlParameter ControlID = "PatInfoName" Name="PatName" PropertyName="text"/>
        <asp:ControlParameter ControlID = "PatInfoAge" Name="PatAge" PropertyName="text" />
        <asp:ControlParameter ControlID = "PatInfoState" Name="PatState" PropertyName="selectedvalue" />
        <asp:ControlParameter ControlID = "PatInfoCountry" Name="PatCountry" PropertyName="selectedvalue" />
        <asp:ControlParameter ControlID = "PatInfoPhone" Name="PatPhone" PropertyName = "text" />
        <asp:ControlParameter ControlID = "PatInfoCell" Name="PatCell" PropertyName="Text" />
        <asp:Parameter DbType="Int32" Direction="Output" Name="PatID" />
    </InsertParameters> 
Protected Sub InsertPatientInfo_Inserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles InsertPatientInfo.Inserted
    Dim PatID As String = e.Command.Parameters("@PatID").Value
    MsgBox(PatID, MsgBoxStyle.Critical)
End Sub

这是对下一个 SqlDataSource 的调用，包括 InsertCommand，我计划在它工作后切换到存储过程；我继续收到错误，标量变量@PatID 未设置，我应该将其声明为 a 吗？如果是，是什么类型？ 代码：

      <asp:SqlDataSource ID="InsInqInfo" runat="server" ConnectionString="<%$ ConnectionStrings:DataConnectionString %>"
        providerName="<%$ ConnectionStrings:DataConnectionString.ProviderName %>"
        InsertCommand = "Insert into tblInquirer(InqPatID, InqName, InqState, InqCountry, InqPhone, InqRelation, InqVia, InqCareLevel, InqProgram) VALUES 
        (@PatID, @InqName, @InqState, @InqCountry, @InqPhone, @InqRelation, @InqVia, @InqCareLevel, @InqProgram)"


<InsertParameters>

            <asp:ControlParameter ControlID = "InqName" Name="InqName" PropertyName="text"/>
            <asp:ControlParameter ControlID = "InqStateList" Name="InqState" PropertyName="selectedvalue" />
            <asp:ControlParameter ControlID = "InqCountry" Name="InqCountry" PropertyName="selectedvalue" />
            <asp:ControlParameter ControlID = "InqPhone" Name="InqPhone" PropertyName="Text" />
            <asp:ControlParameter ControlID = "radInqRel" Name="InqRelation" PropertyName="selectedvalue" />
            <asp:ControlParameter ControlID = "InitInqVia" Name="InqVia" PropertyName = "selectedvalue" />
            <asp:ControlParameter ControlID = "CareLevel" Name="InqCareLevel" PropertyName="selectedvalue" />
            <asp:ControlParameter ControlID = "ProgSelect" Name="InqProgram" PropertyName="selectedvalue" />     
        </InsertParameters>

提前谢谢你， 尼克

Answer 1

在这个InsertPatientInfo_Inserted 处理程序中，您可以将输出参数的值指定为您的另一个名为InsInqInfo 的SqlDataSource 的默认值：

Protected Sub InsertPatientInfo_Inserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles InsertPatientInfo.Inserted
    Dim PatID As String = e.Command.Parameters("@PatID").Value
    MsgBox(PatID, MsgBoxStyle.Critical)
    ' Assign the output as the default for 
    InsInqInfo.InsertCommand("@PatID").DefaultValue = PatID
End Sub

我个人会将所有这些代码移到后面的代码中。

Answer 2

点击此页面可查看有关类型化数据源及其参数的更多信息。 http://www.tek-tips.com/faqs.cfm?fid=7074

http://msdn.microsoft.com/en-us/library/ms228051.aspx

http://msdn.microsoft.com/en-us/library/z72eefad.aspx

<asp:Parameter Name="EmpID" Direction="Output" Type="Int32" DefaultValue="0" />

检查此代码sn-p中的插入语句。

<asp:sqlDataSource ID="EmployeeDetailsSqlDataSource" 
  SelectCommand="SELECT EmployeeID, LastName, FirstName FROM Employees WHERE EmployeeID = @EmpID"

  InsertCommand="INSERT INTO Employees(LastName, FirstName) VALUES (@LastName, @FirstName); 
                 SELECT @EmpID = SCOPE_IDENTITY()"
  UpdateCommand="UPDATE Employees SET LastName=@LastName, FirstName=@FirstName 
                   WHERE EmployeeID=@EmployeeID"
  DeleteCommand="DELETE Employees WHERE EmployeeID=@EmployeeID"

  ConnectionString="<%$ ConnectionStrings:NorthwindConnection %>"
  OnInserted="EmployeeDetailsSqlDataSource_OnInserted"
  RunAt="server">

  <SelectParameters>
    <asp:Parameter Name="EmpID" Type="Int32" DefaultValue="0" />
  </SelectParameters>

  <InsertParameters>
    <asp:Parameter Name="EmpID" Direction="Output" Type="Int32" DefaultValue="0" />
  </InsertParameters>

</asp:sqlDataSource>