(UR 사용하여 SQL 서버를 가정) 세 가지 주요 구성 요소가 있습니다 '무엇인가', 예 : MySqlConnection
, OracleCommand
)
다른 모든 것은 그 위에 구축되었습니다.
예 1 :
using (SqlConnection connection = new SqlConnection("CONNECTION STRING"))
using (SqlCommand command = new SqlCommand())
{
command.commandText = "SELECT Name FROM Users WHERE Status = @OnlineStatus";
command.Connection = connection;
command.Parameters.Add("@OnlineStatus", SqlDbType.Int).Value = 1; //replace with enum
connection.Open();
using (SqlDataReader dr = command.ExecuteReader))
{
List<string> onlineUsers = new List<string>();
while (dr.Read())
{
onlineUsers.Add(dr.GetString(0));
}
}
}
예 2 :
using (SqlConnection connection = new SqlConnection("CONNECTION STRING"))
using (SqlCommand command = new SqlCommand())
{
command.commandText = "DELETE FROM Users where Email = @Email";
command.Connection = connection;
command.Parameters.Add("@Email", SqlDbType.VarChar, 100).Value = "[email protected]";
connection.Open();
command.ExecuteNonQuery();
}