根据所选索引从SQL数据库中选择行

本文关键字：数据库 选择 SQL 索引 | 更新日期: 2023-09-27 18:02:20

当单击选择按钮时，我试图根据主键显示数据库中的行。

<asp:Panel ID="pnlView" runat="server">
        <p>
            <asp:Label ID="lblTitle" runat="server" Text="Label"></asp:Label></p>
        <p>
            <asp:Label ID="lblBody" runat="server" Text="Label"></asp:Label></p>
    </asp:Panel>
    <asp:GridView ID="GridView1" runat="server" DataSourceID="sdsDocuments" EnableModelValidation="True"
        SelectedIndex="0" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
        <Columns>
            <asp:CommandField ShowSelectButton="True" />
        </Columns>
    </asp:GridView>

 protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        lblTitle.Text = GridView1.SelectedRow.ToString();
        lblBody.Text = GridView1.SelectedIndex.ToString();
        SqlConnection thisConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["blcDocumentationConnectionString"].ConnectionString);
        // Create Command Object
        SqlCommand nonqueryCommand = thisConnection.CreateCommand();
        try
        {
            // Open Connection
            thisConnection.Open();
            // Create INSERT statement with named parms
            nonqueryCommand.CommandText = "SELECT DocumentTitle,DocumentBody FROM tblDocument WHERE DocumentID = @DocumentID";
            // Add parms to Command parms collection
            nonqueryCommand.Parameters.Add("@DocumentID", SqlDbType.Int);
            // Execute query statement
            nonqueryCommand.ExecuteNonQuery();
        }
        catch (SqlException ex)
        {
        }
        finally
        {
            // Close Connection
            thisConnection.Close();
        }

根据所选索引从SQL数据库中选择行

在GridView1_SelectedIndexChanged事件中，我看不到您为参数@DocumentID设置了值

替换此nonqueryCommand.Parameters.Add("@DocumentID", SqlDbType.Int);

和这个nonqueryCommand.Parameters.AddWithValue("@DocumentID", GridView1.SelectedValue);

编辑:根据您的评论，您还需要在标签中显示文本，请像…

GridViewRow row = GridView1.SelectedRow;
lblTitle.Text = row.Cells[TitleCellIndex].Text;
lblBody.Text = row.Cells[BodyCellIndex].Text

您没有将值传递给文档id的SQL参数。如果您已经正确地填充了网格，那么当前行值将在EventArgs e变量中。

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