Question

我是asp.net的新手。我想从数据库表中选择值。如果它是PHP，我会像下面的代码一样。

$query = mysql_query(" SELECT * FROM Table WHERE id = ".$d." ");

while($row = mysql_fetch_array($query))
{
   $firstname = $row['firstname'];
   $lastname = $row['lastname'];

 }

如果我在asp.net中使用SqlConnection ...和SqlCommand，或者如果有一些beter Connections，我该怎么办....
提前谢谢你们... ..

Answer 1

//Create a command, using a parameter
var command = new SqlCommand("select firstname, lastname from table where id=@id");
command.Parameters.AddWithValue("id", id);
DataTable dt = new DataTable();

//use a using statement to ensure the connection gets disposed properly
using(var connection = new SqlConnection("connectionstring"))
{
    command.Connection = connection;
    connection.Open();
    //execute the command and load the results in a data table
    dt.Load(command.ExecuteReader());
}

//loop through the results of the data table
foreach(var row in dt.Rows)
{
    var firstname = row.Field<string>("firstname");
    var lastname = row.Field<string>("lastname");
    //do something with firstname and lastname
}

这不是直接翻译，因为我将值存储在DataTable中，但这通常比打开数据连接更好。

ASP.NET select * from table并将它们保存在变量中

1 个答案: