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使用 sql 进行 Gridview 搜索/过滤

[英]Gridview search/filter using sql

 原文  2019-04-21 08:12:48  3   2    c#/ sql/ gridview/ webforms

问题描述

I got a gridview in c# webform, which contains the database from SQL server database, through sqlDataSource.我在 c# webform 中得到了一个 gridview，它包含来自 SQL 服务器数据库的数据库，通过 sqlDataSource。 The SqlDataSource contains a SQL string SqlDataSource 包含一个 SQL 字符串

SELECT * FROM [MaterialView] WHERE (([MaterialName] LIKE '%' + @MaterialName + '%') AND ([SupplierID] = @SupplierID))

The SQL string filter the data twice, by SupplierID and MaterialName. SQL 字符串按供应商 ID 和材料名称过滤数据两次。

First the User determine SupplierID (@SupplierID parameter) on previous page, when gridview page is load, it execute ([SupplierID] = @SupplierID)).首先用户在上一页确定供应商ID（@SupplierID参数），当gridview页面加载时，它执行（[SupplierID] = @SupplierID））。

And then, i got a "search box" + "button" which enable the the user to filter the gridview again, by entering text in "search box" (@MaterialName parameter), which execute ([MaterialName] LIKE '%' + @MaterialName + '%').然后，我得到了一个“搜索框”+“按钮”，它使用户能够通过在“搜索框”（@MaterialName 参数）中输入文本来再次过滤 gridview，执行 ([MaterialName] LIKE '%' + @材料名称 + '%')。

My problem is, when the gridview page is load,since the "search box" is initially EMPTY (no @MaterialName Parameter) , the gridview return 0 record ().我的问题是，当 gridview 页面加载时，由于“搜索框”最初是 EMPTY（没有 @MaterialName 参数），gridview 返回 0 记录（）。

My way of fixing it is creating 2 similar Gridviews, one contains only supplierID filter,another contains both.我修复它的方法是创建 2 个类似的 Gridviews，一个只包含供应商 ID 过滤器，另一个包含两者。

<body>
    <form id="form1" runat="server">
        <div>
            <asp:TextBox ID="TextBox1" runat="server" Height="40px" Width="289px"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" Text="搜尋" OnClick="Button1_Click" />
            <!--初始表單-->
            <asp:Panel ID="Panel1" runat="server">
                <asp:GridView ID="GridView1" runat="server" onrowcommand="GridView1_RowCommand" AllowPaging="True" AutoGenerateColumns="False" DataSourceID="SqlDataSource2" Height="498px" Width="712px" CellPadding="4" ForeColor="#333333" GridLines="None" CssClass="auto-style1">          
            <AlternatingRowStyle BackColor="White" />
            <Columns>
                <asp:TemplateField HeaderText="ClassType"   SortExpression="ClassType">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ClassType") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("ClassType") %>'></asp:Label>
                    </ItemTemplate>
                    <ItemStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="MaterialName" SortExpression="MaterialName">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("MaterialName") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Button ID="Button2" runat="server" commandname="choose" CommandArgument='<%# Eval("MaterialID") %>' Text='<%# Eval("MaterialName") %>' />
                    </ItemTemplate>
                    <ItemStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Quantity" SortExpression="Quantity">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("Quantity") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label4" runat="server" Text='<%# Bind("Quantity") %>'></asp:Label>
                    </ItemTemplate>
                    <ItemStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="MeasureUnit" HeaderStyle-width="10%" SortExpression="MeasureUnit">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox5" runat="server" Text='<%# Bind("MeasureUnit") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label5" runat="server" Text='<%# Bind("MeasureUnit") %>'></asp:Label>
                    </ItemTemplate>
                    <HeaderStyle Width="10%" />
                    <ItemStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:BoundField DataField="CreateDate" HeaderText="CreateDate" SortExpression="CreateDate" Visible="False" />
                <asp:BoundField DataField="SupplierID" HeaderText="SupplierID" SortExpression="SupplierID" Visible="False" />
                <asp:BoundField DataField="MaterialID" HeaderText="MaterialID" SortExpression="MaterialID" Visible="False" />
                <asp:TemplateField HeaderText="SupplierName" SortExpression="SupplierName" Visible="False">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("SupplierName") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label3" runat="server" Text='<%# Bind("SupplierName") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <EditRowStyle BackColor="#7C6F57" />
            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#E3EAEB" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#F8FAFA" />
            <SortedAscendingHeaderStyle BackColor="#246B61" />
            <SortedDescendingCellStyle BackColor="#D4DFE1" />
            <SortedDescendingHeaderStyle BackColor="#15524A" />
        </asp:GridView>
            </asp:Panel>
            <!--過濾表單-->
            <asp:Panel ID="Panel2" runat="server">
                <asp:GridView ID="GridView2" runat="server" AllowPaging="True" AutoGenerateColumns="False" DataSourceID="SqlDataSource3" Height="498px" Width="710px" CellPadding="4" ForeColor="#333333" GridLines="None" CssClass="auto-style1">          
            <AlternatingRowStyle BackColor="White" />
            <Columns>
                <asp:BoundField DataField="ClassType" HeaderText="ClassType" SortExpression="ClassType" />
                <asp:BoundField DataField="MaterialName" HeaderText="MaterialName" SortExpression="MaterialName" />
                <asp:BoundField DataField="Quantity" HeaderText="Quantity" SortExpression="Quantity" />
                <asp:BoundField DataField="MeasureUnit" HeaderText="MeasureUnit" SortExpression="MeasureUnit" />
                <asp:BoundField DataField="CreateDate" HeaderText="CreateDate" SortExpression="CreateDate" Visible="False" />
                <asp:BoundField DataField="MaterialID" HeaderText="MaterialID" SortExpression="MaterialID" Visible="False" />
                <asp:BoundField DataField="SupplierID" HeaderText="SupplierID" SortExpression="SupplierID" Visible="False" />
                <asp:BoundField DataField="SupplierName" HeaderText="SupplierName" SortExpression="SupplierName" Visible="False" />
            </Columns>
            <EditRowStyle BackColor="#7C6F57" />
            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#E3EAEB" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#F8FAFA" />
            <SortedAscendingHeaderStyle BackColor="#246B61" />
            <SortedDescendingCellStyle BackColor="#D4DFE1" />
            <SortedDescendingHeaderStyle BackColor="#15524A" />
        </asp:GridView>
            </asp:Panel>
        </div>

        <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:CompanyConnectionString2 %>" SelectCommand="SELECT * FROM [MaterialView] WHERE ([SupplierID] = @SupplierID)">
            <SelectParameters>
                <asp:SessionParameter Name="SupplierID" SessionField="Gsuply" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:CompanyConnectionString2 %>" SelectCommand="SELECT * FROM [MaterialView] WHERE (([MaterialName] LIKE '%' + @MaterialName + '%') AND ([SupplierID] = @SupplierID))">
            <SelectParameters>
                <asp:ControlParameter ControlID="TextBox1" Name="MaterialName" PropertyName="Text" Type="String" />
                <asp:SessionParameter Name="SupplierID" SessionField="Gsuply" Type="Int32" />
            </SelectParameters>
</asp:SqlDataSource>
    </form>

I expect an One gridview solution.我期待 One gridview 解决方案。 When the textbox is empty (@MaterialName parameter = ""), the gridview return ALL @MaterialName instead of no @MaterialName.当文本框为空时（@MaterialName 参数 = ""），gridview 返回 ALL @MaterialName 而不是没有 @MaterialName。 Thank you.谢谢你。

2 个解决方案

解决方案1
 0 已采纳  2019-04-21 10:56:13

You need to check whether your query parameter is null or its length is 0 or if its contains some value then filter with Like您需要检查您的查询参数是否为空或其长度是否为 0 或者它是否包含某个值，然后使用Like进行过滤

SELECT * FROM [MaterialView] 
WHERE 
((
 @MaterialName IS NULL 
 OR LEN(@MaterialName) = 0 
 OR ([MaterialName] LIKE '%' + @MaterialName + '%')
)
AND ([SupplierID] = @SupplierID));

解决方案2
 0  2019-04-21 12:18:10

It works when I set textbox default text = 0 (@MaterialName parameter source), and modified @er-sho SQL into当我设置文本框默认文本 = 0（@MaterialName 参数源）并将@er-sho SQL 修改为

SELECT * FROM [MaterialView] 
WHERE 
((
 @MaterialName = 0 
 OR ([MaterialName] LIKE '%' + @MaterialName + '%')
 )
 AND ([SupplierID] = @SupplierID));

So i guess the problem is textbox.text default value (if not set) is neither NULL or LEN 0. I know this is a sloppy solution but i'm satisfy with it, Thanks again @er-sho所以我想问题是 textbox.text 默认值（如果未设置）既不是 NULL 也不是 LEN 0。我知道这是一个草率的解决方案，但我很满意，再次感谢@er-sho

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