从SQL Server数据库获取数据

Question

寻找从数据库中获取单个值的最简单方法.当你考虑在.NET语言中存在的所有9,000种方法时,这会让人感到困惑.SqlCommands,DataReaders,Recordsets ......哦,我的!

假设我已经打开了与数据库的连接.我只是想做这样的事情:

Dim age As Integer = <SQL statement here>

Answer 1

SqlConnection conn = new SqlConnection("connection string goes here");
SqlCommand cmd = new SqlCommand("SELECT foo FROM ...", conn);

conn.Open();
int age = (int)cmd.ExecuteScalar();
conn.Close();

不是VB.Net的人,但我认为它在VB.Net中看起来像这样:

Dim conn As SqlConnection = new SqlConnection("connection string goes here")
Dim cmd As SqlCommand = new SqlCommand("SELECT foo FROM ...", conn);

conn.Open()
Dim age As Integer = Convert.ToInt32(cmd.ExecuteScalar())
conn.Close()