SqlDataReader.GetValue在C＃

Question

我在數據庫中兩列

[Title] [Locked] 

和值

[A] [1] 
[B] [4] 
[C] [1] 

讓我們說，如果我想要從第2行2列數據 - >號碼4數據， SqlDataReader類的GetValue方法，應該在哪個數中插入？

Answer 1

該號碼是zero-based。所以0會讓你成爲第一列，1會讓你成爲第二列。

var query = "SELECT title, locked FROM some_table;" 

using (var cmd = new SqlCommand(someConnection, query)) 
{ 
    ... // open the connection, run the query, assign the results to yourReader 

    while (yourReader.Read()) 
    { 
     var title = (string)yourReader.GetValue(0); 
     var locked = (int)yourReader.GetValue(1); 

     // do something with title and locked 
    } 
}