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我的系统中有多个文本框和一个下拉列表，我正在使用查询生成器从数据库（SQL 服务器）中的多个表中选择数据，并将它们显示在网格视图中

建议 ID：（文本框） 员工 ID：（文本框）状态：（下拉列表） 员工姓名：（文本框）

.........................................

我希望通过输入一个或多个字段来使搜索结果起作用。问题是，当我在互联网上浏览以测试查询是否有效时，我发现它只能通过输入所有字段来工作。

这是查询生成器（Visual Studio 2010）中生成的查询

SELECT
SuggestionDetail.SuggestionDescription, SuggestionDetail.SuggestionID,
SuggestionDetail.DateOfSubmission, Employee.EmployeeID, Employee.City,
Employee.EmployeeName, Category.CategoryName, SuggestionStatusDetail.DateOfLastUpdate,
SuggestionStatus.StatusName

FROM
Employee

INNER JOIN
SuggestionDetail

ON
Employee.EmployeeID = SuggestionDetail.EmployeeID

INNER JOIN
Category

ON
SuggestionDetail.CategoryID = Category.CategoryID

INNER JOIN
SuggestionStatusDetail

ON
SuggestionDetail.SuggestionID = SuggestionStatusDetail.SuggestionID

INNER JOIN
SuggestionStatus

ON
SuggestionStatusDetail.StatusID = SuggestionStatus.StatusID

WHERE
(Employee.EmployeeName LIKE N'%' + @empname + N'%')
OR
(Employee.EmployeeID LIKE '%' + @empid + '%')
OR
(SuggestionDetail.SuggestionID LIKE '%' + @txtDocID + '%')
OR
(SuggestionStatus.StatusName LIKE N'%' + @StatusName + N'%')

这是在 HTML 中生成的代码：

     <asp:GridView ID="GridView1" runat="server" BackColor="White" class="GridView"
         BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" 
         EnableModelValidation="True" ForeColor="Black" GridLines="Vertical" 
         AutoGenerateColumns="False" 
         DataSourceID="SqlDataSource2">
         <AlternatingRowStyle BackColor="White" />
         <Columns>
             <asp:BoundField DataField="SuggestionDescription" HeaderText="SuggestionDescription" 
                 SortExpression="SuggestionDescription" />
             <asp:BoundField DataField="SuugestionID" HeaderText="SuggestionID" 
                 InsertVisible="False" ReadOnly="True" SortExpression="SuggestionID" />
             <asp:BoundField DataField="DateOfSubmission" HeaderText="DateOfSubmission" 
                 SortExpression="DateOfSubmission" />
             <asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" 
                 SortExpression="EmployeeID" />
             <asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
             <asp:BoundField DataField="EmployeeName" HeaderText="EmployeeName" 
                 SortExpression="EmployeeName" />
             <asp:BoundField DataField="CategoryName" HeaderText="CategoryName" 
                 SortExpression="CategoryName" />
             <asp:BoundField DataField="DateOfLastUpdate" HeaderText="DateOfLastUpdate" 
                 SortExpression="DateOfLastUpdate" />
             <asp:BoundField DataField="StatusName" HeaderText="StatusName" 
                 SortExpression="StatusName" />
         </Columns>

请帮忙，我还是视觉工作室的新手。 

     <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
         ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 

         SelectCommand="SELECT SuggestionDetail.SuggestionDescription, SuggestionDetail.SuggestionID, SuggestionDetail.DateOfSubmission, Employee.EmployeeID, Employee.City, Employee.EmployeeName, Category.CategoryName, SuggestionStatusDetail.DateOfLastUpdate, SuggestionStatus.StatusName FROM Employee INNER JOIN SuggestionDetail ON Employee.EmployeeID = SuggestionDetail.EmployeeID INNER JOIN Category ON SuggestionDetail.CategoryID = Category.CategoryID INNER JOIN SuggestionStatusDetail ON SuggestionDetail.SuggestionID = SuggestionStatusDetail.SuggestionID INNER JOIN SuggestionStatus ON SuggestionStatusDetail.StatusID = SuggestionStatus.StatusID WHERE (Employee.EmployeeName LIKE N'%' + @empname + N'%') OR (Employee.EmployeeID LIKE '%' + @empid + '%') OR (SuggestionDetail.SuggestionID LIKE '%' + @txtDocID + '%') OR (SuggestionStatus.StatusName LIKE N'%' + @StatusName + N'%')">
         <SelectParameters>
             <asp:ControlParameter ControlID="txtStaffName" Name="empname" 
                 PropertyName="Text" />
             <asp:ControlParameter ControlID="txtStaffID" Name="empid" PropertyName="Text" />
             <asp:ControlParameter ControlID="txtDocID" Name="txtDocID" 
                 PropertyName="Text" />
             <asp:ControlParameter ControlID="ddStatus" Name="StatusName" 
                 PropertyName="SelectedValue" />
         </SelectParameters>
     </asp:SqlDataSource>
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1 回答 1

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IF 连接和其他工作正常，然后看到我在 where 子句中更改了一些字段。当所有参数为空/空白（如可为空）并根据任何一个参数为空/空白返回过滤结果时，它会返回整个结果。

CREATE/ALTER STOREDPROCEDURE SP_NAME
@empname varchar(50) = NULL,
@empid int = NULL,
@txtDocID  int = NULL,
@StatusName varchar(50) = NULL
AS
BEGINE
    SELECT
    SuggestionDetail.SuggestionDescription, SuggestionDetail.SuggestionID,
    SuggestionDetail.DateOfSubmission, Employee.EmployeeID, Employee.City,
    Employee.EmployeeName, Category.CategoryName, SuggestionStatusDetail.DateOfLastUpdate,
    SuggestionStatus.StatusName

    FROM
    Employee

    INNER JOIN
    SuggestionDetail

    ON
    Employee.EmployeeID = SuggestionDetail.EmployeeID

    INNER JOIN
    Category

    ON
    SuggestionDetail.CategoryID = Category.CategoryID

    INNER JOIN
    SuggestionStatusDetail

    ON
    SuggestionDetail.SuggestionID = SuggestionStatusDetail.SuggestionID

    INNER JOIN
    SuggestionStatus

    ON
    SuggestionStatusDetail.StatusID = SuggestionStatus.StatusID

    WHERE
    (Employee.EmployeeName LIKE N'%' + @empname + N'%' OR @empname IS NULL)
    OR
    (Employee.EmployeeID LIKE '%' + @empid + '%' OR @empid IS NULL)
    OR
    (SuggestionDetail.SuggestionID LIKE '%' + @txtDocID + '%' OR @txtDocID IS NULL)
    OR
    (SuggestionStatus.StatusName LIKE N'%' + @StatusName + N'%' OR @StatusName IS NULL)
END
于 2013-05-13T08:53:12.943 回答