asp.net - 如何将 sql 表行数存储在字符串变量中？

Question

我正在尝试存储查询字符串的结果

q = "select count(*) from test" (asp.net c#)

在字符串变量中，以便我可以在按钮单击时在标签上显示计数。

Answer 1

    int RecordCount;
    RecordCount = Convert.ToInt32(cmd.ExecuteScalar());
   string myString =  RecordCount.ToString();

Answer 2

ExecuteScalar的值可以是 null，请确保检查 null

int RecordCount = 0;
object retVal = cmd.ExecuteScalar();
if(retVal != null)
    RecordCount = Convert.ToInt32(cmd.ExecuteScalar());