我有一个GridView，其数据源是一个DataTable，由SqlDataAdapter填充。我在SQL Management Studio中使用多个条件多次测试SQL查询并在数据集中返回多行，但是当我的ASP.NET页面上的数据绑定到GridView时，只有第一行显示应该放在哪里是几排。
此问题的其他解决方案与OnRowDataBound事件有关，但我不会使用该事件。
任何有关使我的代码（特别是我的SQL查询）更有效/更高效的指示也将受到赞赏。
更新：当使用以下参数执行查询时，查询似乎返回多个结果但在其他时间：赋值= 2 requesttype = OT otcode = 3
这是包含搜索条件（文本框和下拉列表）的ASP.NET页面以及有问题的GridView：
<div>
<label id="lblCardNumber" for="tbCardNumber">Card number</label>
<asp:TextBox runat="server" ID="tbCardNumber"></asp:TextBox>
<Label ID="lblUsername" for="tbUsername">Username</Label>
<asp:TextBox runat="server" ID="tbUsername"></asp:TextBox>
<Label ID="lblAssignment" for="ddlAssignment">Assignment</Label>
<asp:DropDownList runat="server" CssClass="textbox" ID="ddlAssignment">
<asp:ListItem Value='NULL' Text='Select' />
<asp:ListItem Value="1" Text='1' />
<asp:ListItem Value="2" Text='2' />
<asp:ListItem Value="3" Text='3' />
<asp:ListItem Value="4" Text='4' />
<asp:ListItem Value="5" Text='5' />
</asp:DropDownList>
<Label ID="lblRequestType" for="ddlRequestType">Request Type</Label>
<asp:DropDownList runat="server" ID="ddlRequestType">
<asp:ListItem Value="NULL" Text="select" />
<asp:ListItem Value="All" Text="All" />
<asp:ListItem Value="OT" Text="OT" />
<asp:ListItem Value="CO" Text="CO" />
<asp:ListItem Value="TR" Text="TR" />
<asp:ListItem Value="EP" Text="EP" />
<asp:ListItem Value="TO" Text="TO" />
</asp:DropDownList>
<div id="OTSubTypes" class="subtypes OT">
<label for="ddlOTCode">ot code no.</label>
<asp:DropDownList runat="server" CssClass="textbox" ID="ddlOTCode">
<asp:ListItem Value='0' Text='Select' />
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
<asp:ListItem Value="4">4</asp:ListItem>
<asp:ListItem Value="5">5</asp:ListItem>
<asp:ListItem Value="6">6</asp:ListItem>
</asp:DropDownList>
</div>
<div id="COSubTypes" class="subtypes CO">
<label for="rblCourtSession">Court Session</label>
<asp:RadioButtonList runat="server" ID="rblCourtSession">
<asp:ListItem>morning</asp:ListItem>
<asp:ListItem>afternoon</asp:ListItem>
<asp:ListItem>standby</asp:ListItem>
</asp:RadioButtonList>
<label for="rblCourtType">Court Type</label>
<asp:RadioButtonList runat="server" ID="rblCourtType">
<asp:ListItem>superior</asp:ListItem>
<asp:ListItem>ygc</asp:ListItem>
<asp:ListItem>traffic</asp:ListItem>
</asp:RadioButtonList>
<label for="rblAppearanceType">Appearance Type</label>
<asp:RadioButtonList runat="server" ID="rblAppearanceType">
<asp:ListItem>trailing</asp:ListItem>
<asp:ListItem>da Conference</asp:ListItem>
<asp:ListItem>administrative hearing</asp:ListItem>
</asp:RadioButtonList>
</div>
<div id="TRSubTypes" class="subtypes TR">
<label for="ddlTrainingCode">Training Code</label>
<asp:DropDownList runat="server" CssClass="textbox" ID="ddlTrainingCode">
<asp:ListItem Value='0' Text='Select' />
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
</asp:DropDownList>
</div>
<Label ID="lblBeginningDate" for="tbBeginningDate">Beginning Date</Label>
<asp:TextBox runat="server" ID="tbBeginningDate"></asp:TextBox>
<Label ID="lblAccountNumber" for="tbAccountNumber">Account Number</Label>
<asp:TextBox runat="server" ID="tbAccountNumber"></asp:TextBox>
<div>
<asp:Button runat="server" ID="btnSearch" Text="search" OnClick="btnSearchClick" />
<asp:Button runat="server" ID="btnClearFields" Text="clear fields"/>
</div>
<div class="table-responsive">
<asp:GridView runat="server" class="table table-striped table-hover" ID="gvSearchResults" GridLines="None" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="card_number" HeaderText="Card Number" />
<asp:BoundField DataField="RequestType" HeaderText="Card Type" />
<asp:BoundField DataField="beginning_date" HeaderText="Date" />
<asp:BoundField DataField="status_id" HeaderText="Status" />
<asp:TemplateField>
<HeaderTemplate>
edit
</HeaderTemplate>
<ItemTemplate>
<a href="<%#Eval("RequestType") %>Request.aspx?id=<%#Eval("card_number") %>">edit/view</a>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle CssClass="cursor-pointer" />
</asp:GridView>
</div>
这是c＃：
protected void btnSearchClick(object sender, EventArgs e)
{
string connstring = ConfigurationManager.ConnectionStrings["TimeHubDBCS"].ConnectionString;
SqlCommand cmd = new SqlCommand();
cmd.CommandType = System.Data.CommandType.StoredProcedure;
using (SqlConnection conn = new SqlConnection(connstring))
{
cmd.Connection = conn;
//declare parameters that are independent of request type
cmd.Parameters.Add("@CardNumber", SqlDbType.VarChar).Value = tbCardNumber.Text;
cmd.Parameters.Add("@Username", SqlDbType.VarChar).Value = tbUsername.Text;
cmd.Parameters.Add("@Assignment", SqlDbType.VarChar).Value = ddlAssignment.SelectedValue;
cmd.Parameters.Add("@BeginningDate", SqlDbType.VarChar).Value = tbBeginningDate.Text;
//declare sqlcommand arguments and parameters that are dependent on request type
switch (ddlRequestType.SelectedValue.ToString().ToLower())
{
case "co":
cmd = new SqlCommand("spSearchCORequests", conn);
cmd.Parameters.Add("@CourtSession", SqlDbType.VarChar).Value = rblCourtSession.SelectedValue;
cmd.Parameters.Add("@CourtType", SqlDbType.VarChar).Value = rblCourtType.SelectedValue;
cmd.Parameters.Add("@AppearanceType", SqlDbType.VarChar).Value = rblAppearanceType.SelectedValue;
break;
case "ep":
cmd = new SqlCommand("spSearchEPRequests", conn);
break;
case "ot":
cmd.CommandText = "spSearchOTRequests";
//cmd = new SqlCommand("spSearchOTRequests", conn);
cmd.Parameters.Add("@AccountNumber", SqlDbType.VarChar).Value = tbAccountNumber.Text;
cmd.Parameters.Add("@OTCode", SqlDbType.VarChar).Value = ddlOTCode.SelectedValue;
break;
case "pt":
cmd = new SqlCommand("spSearchPTRequests", conn);
break;
case "to":
cmd = new SqlCommand("spSearchTORequests", conn);
break;
case "tr":
cmd = new SqlCommand("spSearchTRRequests", conn);
cmd.Parameters.Add("@TrainingCode", SqlDbType.VarChar).Value = ddlTrainingCode.SelectedValue;
break;
}
SqlDataAdapter daSearchResults = new SqlDataAdapter();
daSearchResults.SelectCommand = cmd;
DataTable dtSearchResults = new DataTable();
try
{
conn.Open();
daSearchResults.Fill(dtSearchResults);
conn.Close();
}
catch(Exception ex)
{
message = "search error: ";
ClientScript.RegisterStartupScript(this.GetType(), "Popup", "ShowPopup('" + message + ex.Message + "');", true);
}
gvSearchResults.DataSource = dtSearchResults;
gvSearchResults.DataBind();
gvSearchResults.UseAccessibleHeader = true;
gvSearchResults.HeaderRow.TableSection = TableRowSection.TableHeader;
}
}
这是SQL查询：
ALTER PROCEDURE spSearchOTRequests
@CardNumber VARCHAR(MAX)=NULL,
@Username VARCHAR(MAX)=NULL,
@Assignment VARCHAR(MAX)=NULL,
@BeginningDate VARCHAR(MAX)=NULL,
@AccountNumber VARCHAR(MAX)=NULL,
@OTCode VARCHAR(MAX)=NULL
AS
BEGIN
SET @CardNumber = ISNULL(@CardNumber, '')
SET @Username = ISNULL(@Username, '')
SET @Assignment = ISNULL(@Assignment, '')
SET @BeginningDate = ISNULL(@BeginningDate, '')
SET @AccountNumber = ISNULL(@AccountNumber, '')
SET @OTCode = ISNULL(@OTCode, '')
IF @CardNumber = '' BEGIN SET @CardNUmber = @CardNumber + '%' END
IF @Username = '' BEGIN SET @Username = @Username + '%' END
IF @Assignment = '' BEGIN SET @Assignment = @Assignment + '%' END
IF @BeginningDate = '' BEGIN SET @BeginningDate = @BeginningDate + '%' END
IF @AccountNumber = '' BEGIN SET @AccountNumber = @AccountNumber + '%' END
IF @OTCode = '' BEGIN SET @OTCode = @OTCode + '%' END
SELECT
card_number,
UserCredited,
user_star,
assignment,
beginning_date,
event_number,
ot_code,
status_id,
RequestType
FROM dbo.OTCard
WHERE
(@CardNumber IS NULL OR (@CardNumber = '') OR (card_number LIKE @CardNumber))
AND (@Username IS NULL OR (@Username = '') OR (UserCredited LIKE @Username))
AND (@Assignment IS NULL OR (@Assignment = '') OR (assignment LIKE @Assignment))
AND (@BeginningDate IS NULL OR (@BeginningDate = '') OR (beginning_date LIKE @BeginningDate))
AND (@AccountNumber IS NULL OR (@AccountNumber = '') OR (event_number LIKE @AccountNumber))
AND (@OTCode IS NULL OR (@OTCode = '') OR (ot_code LIKE @OTCode))
OPTION (RECOMPILE)
END
答案 0 :(得分：0)
在您的下拉列表中，您有第一个选项 这个发送到商店的程序将作为文本＆＃39; NULL＆＃39;不是空值 试试这个
cmd.Parameters.Add("@Assignment", SqlDbType.VarChar).Value = ddlAssignment.SelectedValue == "NULL" ? null : ddlAssignment.SelectedValue;
首先，您需要确保从该过程返回多条记录，您可以在填写dtSearchResults并查看它包含的记录数后中断。 如果表包含多行并且网格显示一行，则使用浏览器检查器检查表的html输出，也许css样式与它有关。
用于SQL查询 这些条件
(@CardNumber IS NULL OR (@CardNumber = '' )
(@Username IS NULL OR (@Username = '' )
(@Assignment IS NULL OR (@Assignment = '' )
(@BeginningDate IS NULL OR (@BeginningDate = '' )
(@AccountNumber IS NULL OR (@AccountNumber = '' )
(@OTCode IS NULL OR (@OTCode = '' )
它们永远不会是真的，因为你转换NULL和Empty参数，并且在sp的binning中为％，所以你应该为它们做好准备
我看到所有参数都是varchar（max）这也是表中的数据类型吗？
您可以尝试使用参数化动态sql
declare @SQL nvarchar(max)
set @SQL =' SELECT
card_number ,
UserCredited ,
user_star ,
assignment ,
beginning_date ,
event_number ,
ot_code ,
status_id ,
RequestType
FROM dbo.OTCard
WHERE 1=1 '
IF ISNULL(@CardNumber,'') <>''
SET @SQL=@SQL+' AND card_number LIKE @CardNumber'
IF ISNULL(@Username,'') <>''
SET @SQL=@SQL+' AND UserCredited LIKE @Username'
Continue with the rest of the parameters
....
....
EXECUTE sp_executesql @SQL,
N'@CardNumber VARCHAR(MAX),@Username VARCHAR(MAX),@Assignmen VARCHAR(MAX),@BeginningDate VARCHAR(MAX),@AccountNumber VARCHAR(MAX), @OTCode VARCHAR(MAX)',
@CardNumber,@Username,@Assignment,@BeginningDate,@AccountNumber ,@OTCode
对于参数嗅探问题，您可以在@SQL
中使用OPTION（RECOMPILE）或者，如果你有一些参数，当值改变时，它会显着改变执行计划，你想要每次使用这样的东西时重新编译的成本
declare @HashKey varbinary(20)
select @HashKey= HASHBYTES('SHA1', @Username ) you can concatenate more parameters if you wish
SET @SQL='declare @HashKey nvarchar(200)
SET @HashKey='''+ CONVERT(nvarchar(100),@HashKey,1 )+'''
'+@SQL
在EXECUTE sp_executesql @SQL
之前添加它