Question

我的系统中有多个文本框和一个下拉列表，我使用“查询”构建器从数据库（SQL服务器）中的多个表中选择数据，并在网格视图中显示它们

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字段或多个字段来搜索结果。问题是，当我在互联网上浏览以测试查询是否有效时，我发现只有输入所有字段才能起作用。

这是查询构建器（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>

任何帮助请，我仍然是视觉工作室的新人。

     <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>

Answer 1

如果连接和其他东西工作正常，那么看我在where子句中更改了一些字段。当所有参数都为null / blank（如可为空）并且根据任何一个参数返回过滤结果时，返回整个结果为null / blank。

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

asp.net中的多个搜索文本框

1 个答案: