Question

我尝试了很多，但我无法找到解决这个问题的方法。这就是我的问题。实际上，我正在创建＆＃34; DATABASE EDITOR＆＃34;在ASP.NET C＃中。这是我的数据库＆＃34; tbl_field＆＃34;表

其中用户插入值并创建表。我知道这可以轻松完成查询，我可以做到，但首先我想在表中存储值。我希望当用户点击创建表然后每次这样gridview打开，这里是图像，当用户点击＆＃34;插入＆＃34;然后将值插入数据库表＆＃34; tbl_field＆＃34;并且还显示上面插入的行。但问题是当另一个用户登录然后创建表格然后再次显示这个griview和插入的行。我是初学者，我不知道如何处理这个问题。我＆＃39 ;我试图解释我的问题，希望我的问题很清楚。这是我的aspx代码：`

<label id="welcome" style="color: Blue" runat="server">
</label>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="user" runat="Server">
<label style="position:relative; top:60px; left:140px  runat="server">Table Name </label>
    <asp:TextBox ID="txttable" runat="server" style="position:relative;   top:60px; left:140px; border-style:double;" ></asp:TextBox>
    <asp:GridView ID="GridView2"  runat="server" ShowHeaderWhenEmpty="True"  
      AutoGenerateColumns="False" BackColor="#DEBA84"
    BorderColor="#DEBA84"  BorderStyle="None" BorderWidth="1px" 
    CellPadding="3" CellSpacing="2"
     ShowFooter="True" Style="margin-left: 136px; margin-top: 72px;
    margin-right: 0px;" Height="16px" Width="685px" onselectedindexchanged="GridView2_SelectedIndexChanged" >

    <Columns>
        <asp:TemplateField HeaderText="Column_Name" SortExpression="Column_Name">

            <EditItemTemplate>
                 <asp:TextBox ID="txtName" runat="server" Text='<%#Bind("Column_Name") %>'></asp:TextBox>
                <asp:RequiredFieldValidator Text="*" ID="colname" ControlToValidate="txtName"
                    runat="server" ErrorMessage="Column Name is Required" ForeColor="Red">
                </asp:RequiredFieldValidator>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%#Bind("Column_Name") %>'></asp:Label>
            </ItemTemplate>

            <FooterTemplate>

                <asp:TextBox ID="textColname" runat="server"></asp:TextBox>
                <asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*" ID="insertcolname" ControlToValidate="textColname"
                    runat="server" ErrorMessage="Column Name is Required" ForeColor="Red">
                </asp:RequiredFieldValidator>


           </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Data_Type" SortExpression="Data_Type">
            <EditItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%#Bind("Data_Type") %>'>
                    <asp:ListItem>Select Datatype</asp:ListItem>
                    <asp:ListItem>int</asp:ListItem>
                    <asp:ListItem>Float</asp:ListItem>
                    <asp:ListItem>Varchar(50)</asp:ListItem>
                    <asp:ListItem>Varchar(100)</asp:ListItem>
                    <asp:ListItem>double</asp:ListItem>
                </asp:DropDownList>
                <asp:RequiredFieldValidator ID="datatype" ControlToValidate="DropDownList1"
                    runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
                </asp:RequiredFieldValidator>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="Label2" runat="server" Text='<%# Bind("Data_Type") %>'></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:DropDownList ID="DropDownList2" runat="server">
                    <asp:ListItem>Select Datatype</asp:ListItem>
                    <asp:ListItem>int</asp:ListItem>
                    <asp:ListItem>Float</asp:ListItem>
                    <asp:ListItem>Varchar(50)</asp:ListItem>
                    <asp:ListItem>Varchar(100)</asp:ListItem>
                    <asp:ListItem>double</asp:ListItem>
                </asp:DropDownList>
                <asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*"  ID="datatype" ControlToValidate="DropDownList2"
                    runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
                </asp:RequiredFieldValidator>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Allow_Null_" SortExpression="Allow_Null_">
                                <EditItemTemplate>
                                    <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Allow_Null_")) %>'/>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Allow_Null_"))%>' enabled="false" />
                                </ItemTemplate>
                                <FooterTemplate>
                                    <asp:CheckBox ID="nulll" runat="server" />
                                </FooterTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Primary_Key_" SortExpression="Primary_Key_">
                                <EditItemTemplate>
                                    <asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Primary_Key_")) %>' />
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:CheckBox ID="CheckBox2" runat="server" 
                                        Checked='<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Primary_Key_")) %>' Enabled="false" />
                                </ItemTemplate>
                                <FooterTemplate>
                                    <asp:CheckBox ID="primary" runat="server" />
                                </FooterTemplate>
                            </asp:TemplateField>

        <asp:CommandField ShowEditButton="True" />
        <asp:CommandField ShowDeleteButton="True" />

        <asp:TemplateField HeaderText="Insert">
        <FooterTemplate>


             <asp:LinkButton ValidationGroup="INSERT" ID="LinkButton1" runat="server" OnClick="lbinssert">INSERT</asp:LinkButton>
            </FooterTemplate>
        </asp:TemplateField>


    </Columns>
    <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
    <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
    <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
    <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
    <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
    <SortedAscendingCellStyle BackColor="#FFF1D4" />
    <SortedAscendingHeaderStyle BackColor="#B95C30" />
    <SortedDescendingCellStyle BackColor="#F1E5CE" />
    <SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>

<asp:ValidationSummary ValidationGroup="INSERT" ID="ValidationSummary1" ForeColor="Red"
    runat="server" Height="25px" style="margin-left: 140px" />
    <br />
<input type="submit" style="position:relative; width:30px; left:452px; top: 0px; width: 86px;" 
     value="Create table" name="create"/>
<asp:ValidationSummary ID="ValidationSummary2" ForeColor="Red" runat="server" 
    style="margin-left: 142px" />
    <asp:SqlDataSource ID="sql" runat="server" 
     ConnectionString="<%$ ConnectionStrings:db_compilerConnectionString %>" 

     SelectCommand="SELECT [Table_Name], [Column_Name], [Data_Type], [Allow_Null_], [Primary_Key_], [Date] FROM [tbl_field]"
     DeleteCommand="DELETE  FROM [tbl_field] WHERE [Field_id]=@field" InsertCommand="INSERT INTO [tbl_field] ([Table_Name],[Column_Name],[Data_Type],[Database_id],[Allow_Null_],[Primary_Key_])Values (@TableName,@ColumnName,@Dtype,@id,@null,@primary)"
     UpdateCommand="UPDATE [tbl_field] SET [Table_Name]=@TableName, [Column_Name]=@ColumnName,[Data_Type]=@Dtype,[Database_id]=@id,[Allow_Null_]=@null,[Primary_Key_]=@primary">
     <DeleteParameters>
     <asp:Parameter Name="field" Type="Int32" />
     </DeleteParameters>
     <InsertParameters>
     <asp:Parameter Name="TableName" Type="String" />
     <asp:Parameter Name="ColumnName" Type="String" />
      <asp:Parameter Name="Dtype" Type="String" />
       <asp:Parameter Name="id" Type="String" />
        <asp:Parameter Name="null" Type="Boolean" />
         <asp:Parameter Name="primary" Type="Boolean" />


     </InsertParameters>
     <UpdateParameters>
     <asp:Parameter Name="TableName" Type="String" />
      <asp:Parameter Name="ColumnName" Type="String" />
      <asp:Parameter Name="Dtype" Type="String" />
       <asp:Parameter Name="id" Type="String" />
        <asp:Parameter Name="null" Type="Boolean"/>
         <asp:Parameter Name="primary" Type="Boolean" />

     </UpdateParameters>

 </asp:SqlDataSource>

这是aspx.cs代码：

protected void Page_Load(object sender, EventArgs e)
{
   SqlConnection cnn = new SqlConnection("Data Source=HAMEED_KHAN\\SQLEXPRESS;Initial Catalog=db_compiler;Integrated Security=True");
        DataTable dt = new DataTable();
        SqlCommand cmd = new SqlCommand("SELECT * FROM tbl_field", cnn);
        SqlDataAdapter ad = new SqlDataAdapter(cmd);
        ad.Fill(dt);
        GridView2.DataSource = dt;

        FixGridFooter(dt);
}
 public void lbinssert(Object sender,EventArgs e)
{

    sql.InsertParameters["TableName"].DefaultValue = txttable.Text;


    sql.InsertParameters["ColumnName"].DefaultValue = ((TextBox)GridView2.FooterRow.FindControl("textColname")).Text;

      sql.InsertParameters["Dtype"].DefaultValue = ((DropDownList)GridView2.FooterRow.FindControl("DropDownList2")).Text;

    sql.InsertParameters["id"].DefaultValue = Session["value"].ToString();

    sql.InsertParameters["null"].DefaultValue =
      ((CheckBox)GridView2.FooterRow.FindControl("nulll")).Checked == true ? "true" : "false";
    sql.InsertParameters["primary"].DefaultValue = ((CheckBox)GridView2.FooterRow.FindControl("primary")).Checked == true ? "true" : "false";

    sql.Insert();
 }
public void FixGridFooter(DataTable dataSour)
{


    dataSour.Rows.Add(dataSour.NewRow());
    dataSour.Rows[0]["Table_Name"] = 0;
    dataSour.Rows[0]["Column_Name"] = 0;
    dataSour.Rows[0]["Data_Type"] = "";
    dataSour.Rows[0]["Database_id"] = 0;
    dataSour.Rows[0]["Allow_Null_"] = true;
    dataSour.Rows[0]["Primary_Key_"] = false;
   dataSour.Rows[0]["Date"] = DateTime.Now.ToString("dd MMM yyyy");
   GridView2.DataSource = dataSour;
    GridView2.DataBind();

    //hide empty row - if you want to display it on an event like a button click else it will display as per default.
    GridView2.Rows[0].Visible = false;
    GridView2.ShowFooter = true;
}

实际上，我绑定了数据库表中的值，因此每次表都显示插入值等。

Answer 1

如果您的问题是最初只显示标题，则在未插入数据时，您可以尝试使用GridView属性ShowHeaderWhenEmpty。此属性指示当列没有数据时，GridView控件中列的标题是否可见。
如果在gridview中没有数据时需要显示空行和标题，则需要将gridview与包含一个虚拟元素的List绑定，可以在no时初始化数据来自数据库。

如何使用gridview将值插入到同一个表中？ Asp.net c＃，sql

1 个答案: