Simple SQL select in C#?

On my current project, to get a single value (select column from table where id=val), the previous programmer goes through using a datarow, datatable and an sqldatadapter (and of course sqlconnection) just to get that one value.

Is there an easier way to make a simple select query? In php, I can just use mysql_query and then mysql_result and I’m done.

It would be nice if I could just do:

SqlConnection conSql = new SqlConnection(ConnStr);
SomeSqlClass obj = new SomeSqlClass(sql_string, conSql);
return obj[0];

Thanks for any tips.


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Method 1

You can skip the DataReader and the DataAdapter and just call ExecuteScalar() on the sql command.

using (SqlConnection conn = new SqlConnection(connString))
      SqlCommand cmd = new SqlCommand("SELECT * FROM whatever 
                                       WHERE id = 5", conn);
            newID = (int)cmd.ExecuteScalar();
        catch (Exception ex)

Method 2

You are probably looking for SqlCommand and SqlDataReader

Dictionary<int, string> users = new Dictionary<int, string>();
using(SqlConnection connection = new SqlConnection("Your connection string"))
    string query = "SELECT UserId, UserName FROM Users";
    SqlCommand command = new SqlCommand(query, connection);
    using (SqlDataReader reader = command.ExecuteReader())
        while (reader.Read())
            users.Add(reader.GetInt32(0), reader.GetString(1));

Method 3

Actually, there is a method SqlCommand.ExecuteScalar() that will simply return the first field from the first row of the returned results. Just for you.

.NET Framework Class Library
SqlCommand..::.ExecuteScalar Method

Executes the query, and returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

Method 4

You can do something very similar:

using (SqlConnection conn = new SqlConnection(ConnStr))
using (SqlCommand cmd = new SqlCommand(sql_string, conn))
    return cmd.ExecuteScalar();

Method 5

you can use SqlCommands executeScalar function. Please look at the following link

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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