C#学习笔记——连接sqlserver数据库

1）SqlConnection

static void Main(string[] args)
{
string connection =
"server=.;database=db_test;Trusted_connection=true;";
SqlConnection sc = new SqlConnection();
sc.ConnectionString = connection;
try
{
sc.Open();
Console.WriteLine("already open the database");
}
catch(Exception ex)
{
Console.WriteLine("error!!! {0}", ex.Message);
}
finally
{
sc.Close();
Console.WriteLine("already close the database");
}
System.Console.ReadLine();

}

2）udl连接方法

static void Main(string[] args)
{
OleDbConnection connection = new OleDbConnection("File Name=d://test.udl");
try
{
connection.Open();
if (connection.State == System.Data.ConnectionState.Open)
Console.WriteLine("Connection open successfully!");
else
Console.WriteLine("Connection could not be established");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message.ToString());
}
finally
{
connection.Close();
}
Console.ReadLine();
}