Question

我在Visual Studio中使用Repeater（asp.net和c＃）。问题是，我不太确定如何正确格式化我的存储过程。

这是错误：

我的目标是让Repeater显示表格中每列的标签和文本框。标签必须包含数据库中的DisplayName。

以下是我要用于FormField的表格Repeater。

所以这是我对存储过程的想法：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[spGetFormFields]
        @TableName nvarchar,
        @EventId int
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    SELECT COLUMN_NAME AS MyColumn
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_NAME = @TableName 
      AND EventId = @EventId 
      AND Visible = 1
END

然而，由于我在EventId和Visible收到错误，这不太有效：

列名无效

所以这就是我在C＃中所拥有的：

protected void Page_Load(object sender, EventArgs e)
{
        //Make label names diff
        //Control which columns are shown
        //Style the labels and textboxes to css
        DataTable table = new DataTable();
        table.Columns.Add("MyColumn", typeof(string));

        using (SqlConnection sqlConn2 = new SqlConnection(ConfigurationManager.ConnectionStrings["Events2"].ConnectionString))
        {
            sqlConn2.Open();

            using (SqlCommand sqlCmd2 = new SqlCommand())
            {
                sqlCmd2.Connection = sqlConn2;
                sqlCmd2.CommandType = System.Data.CommandType.Text;
                sqlCmd2.CommandText = string.Format("SELECT COLUMN_NAME AS MyColumn FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = @TableName AND EventId = @EventId AND Visible = 1");
                sqlCmd2.Parameters.Add("@TableName", SqlDbType.NVarChar).Value = "FormField";
                sqlCmd2.Parameters.Add("@EventId", SqlDbType.NVarChar).Value = "1";

                sqlCmd2.ExecuteNonQuery();

                using (SqlDataReader sqlReader = sqlCmd2.ExecuteReader())
                {
                    while (sqlReader.Read())
                    {
                        DataRow tableRow = table.NewRow();
                        tableRow["MyColumn"] = sqlReader["MyColumn"].ToString();
                        table.Rows.Add(tableRow);
                    }

                    Repeater1.DataSource = table;
                    Repeater1.DataBind();
                }

                sqlConn2.Close();
            }
        }
    }
}

我的C＃代码在没有任何存储过程的情况下实现SQL（仍然会得到关于不存在的列的相同错误）。当然，我希望在我将其运行后添加存储过程，因此这是出于测试目的。

最后，这是asp.net标记：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="repeater.aspx.cs" Inherits="admin_repeater" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Repeater ID="Repeater1" runat="server">
   <ItemTemplate>
        <asp:Label ID="lblTest" runat="server" Text='<%# Eval("MyColumn") %>'></asp:Label>
        <asp:TextBox ID="textTest" runat="server"></asp:TextBox>
   </ItemTemplate>
</asp:Repeater>
    </div>
    </form>
</body>
</html>

Answer 1

正如评论中所述，您正在查询INFORMATION_SCHEMA.COLUMNS表，并且没有此类列EventId＆amp; Visible那里。如果我理解正确你想根据条件从你的表中显示DisplayName那么你可以直接这样做： -

SELECT DisplayName AS MyColumn
    FROM [Events2].dbo.[FormField]
    WHERE EventId = @EventId AND 
    Visible = 1

Repeater的存储过程 - 从表

1 个答案: