Question

我正在开发一个从6列数据库生成数据的网站。其中一列是shortDescription，另一列是FullDescription。我在shortDescription旁边添加了一个链接，“更多”，它必须带到另一个页面，并且每个特定条目只显示数据库中的FullDescription ..下面是代码：

public partial class Events : System.Web.UI.Page
{
    public SqlDbType EventID { get; private set; }

    protected void Page_Load(object sender, EventArgs e)
        {
        if (!IsPostBack)
            {
            SqlConnection Connection;
            SqlCommand Command;
            SqlDataReader Reader;
            string sql = System.Configuration.ConfigurationManager.ConnectionStrings["EventDBConnectionString"].ConnectionString;
            Connection = new SqlConnection(sql);
            string CommandString = "SELECT * FROM Event ";
            Command = new SqlCommand(CommandString, Connection);
            Command.CommandType = CommandType.Text;
            Command.Connection = Connection;
            Command.Connection.Open();
            Command.ExecuteNonQuery();
            string html  = "<table>";
            html += "<tr><td>Name</td><td>Type</td><td>NumTickets</td><td>EventDate</td><td>ShortDescription</td><td>ImageLocation</td></tr>";
            Reader = Command.ExecuteReader(CommandBehavior.CloseConnection);
            if(Reader.HasRows)
            {
                while (Reader.Read())
                {
                    html += "<tr><td>"+ Reader["Name"]+"</td>";
                    html += "<td>" + Reader["Type"] + "</td>";
                    html += "<td>" + Reader["NumTickets"] + "</td>";
                    html += "<td>" + Reader["EventDate"] +  "</td>";
                    html += "<td>" + Reader["ShortDescription"] + " <a href='Events.aspx?id" + Reader["EventID"]  + "'> More</a>" + "</td>";
                    html += "<td><img src='App_Media\\" + Reader["ImageLocation"] +"'>"+ "</td><tr>";
                }
                html += "</table>";
                movieString.InnerHtml = html;
            }
            Command.Connection.Close();
            Command.Dispose();
            Connection.Dispose();
        }
    }
}

如果有人知道如何使用网址参数实现这一目标，那么您的输入将非常受欢迎。

Answer 1

你需要创建另一个页面：EventDetails.aspx并从url获取id值以显示长描述。

在EventDetails.aspx页面内，您必须检索一行（按id）并使用Web控件显示信息，类似于Events.aspx页面，但为Sql命令添加WHERE子句。

示例代码：

Events.aspx

public partial class Events : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string sql = System.Configuration.ConfigurationManager.ConnectionStrings["EventDBConnectionString"].ConnectionString;

            var connection = new SqlConnection(sql);

            var commandString = " SELECT * FROM Event ";

            var Command = new SqlCommand(commandString, connection);
            Command.CommandType = CommandType.Text;
            Command.Connection = connection;
            Command.Connection.Open();
            Command.ExecuteNonQuery();

            var html = "<table><tr><td>Name</td><td>Type</td><td>NumTickets</td><td>EventDate</td><td>ShortDescription</td><td>ImageLocation</td></tr>";

            var Reader = Command.ExecuteReader(CommandBehavior.CloseConnection);

            if (Reader.HasRows)
            {
                while (Reader.Read())
                {
                    html += "<tr><td>" + Reader["Name"] + "</td>";
                    html += "<td>" + Reader["Type"] + "</td>";
                    html += "<td>" + Reader["NumTickets"] + "</td>";
                    html += "<td>" + Reader["EventDate"] + "</td>";
                    html += "<td>" + Reader["ShortDescription"] + " <a href='Events.aspx?id=" + Reader["EventID"] + "'> More</a>" + "</td>";
                    html += "<td><img src='App_Media\\" + Reader["ImageLocation"] + "'>" + "</td><tr>";
                }

                html += "</table>";

                movieString.InnerHtml = html;
            }

            Command.Connection.Close();
            Command.Dispose();

            connection.Dispose();
        }
    }
}

Details.aspx

public partial class Details : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            var sql = System.Configuration.ConfigurationManager.ConnectionStrings["EventDBConnectionString"].ConnectionString;

            var connection = new SqlConnection(sql);

            var commandString = " SELECT * FROM Event WHERE EventID = @eventID ";

            var eventID = -1;

            try
            {
                eventID = Convert.ToInt32(Request.QueryString["id"]);
            }
            catch
            {
                eventID = -1;
            }

            var command = new SqlCommand(commandString, connection);
            command.CommandType = CommandType.Text;
            command.Connection = connection;
            command.Parameters.Add(new SqlParameter("@eventID", eventID));
            command.Connection.Open();
            command.ExecuteNonQuery();

            var html = "<table><tr><td>Name</td><td>Type</td><td>NumTickets</td><td>EventDate</td><td>ShortDescription</td><td>ImageLocation</td></tr>";

            var reader = command.ExecuteReader(CommandBehavior.CloseConnection);

            if (reader.HasRows)
            {
                reader.Read();

                // display values in controls

                movieString.InnerHtml = html;
            }

            command.Connection.Close();
            command.Dispose();

            connection.Dispose();
        }
    }
}

请不要使用＆＃34; SELECT * FROM ...＆＃34;，有关使用这种选择的性能问题，请为每个列名提供一个select语句。

此代码还有其他改进：

使用ORM从数据库中读取数据（例如实体框架）
使用网页控件显示信息（GridView等）

使用URL参数在ASP.net中显示详细信息

1 个答案: