/// <summary>
/// Execute a single command against a MySQL database.
/// </summary>
/// <param name="connectionString">Settings to use for the update</param>
/// <param name="commandText">Command text to use for the update</param>
/// <returns>The first column of the first row in the result set, or a null reference if the result set is empty.</returns>
public static object ExecuteScalar(string connectionString, string commandText)
{
//pass through the call providing null for the set of MySqlParameters
return ExecuteScalar(connectionString, commandText, (MySqlParameter[])null);
}
/// <summary>
/// Execute a single command against a MySQL database.
/// </summary>
/// <param name="connectionString">Settings to use for the command</param>
/// <param name="commandText">Command text to use for the command</param>
/// <param name="commandParameters">Parameters to use for the command</param>
/// <returns>The first column of the first row in the result set, or a null reference if the result set is empty.</returns>
public static object ExecuteScalar(string connectionString, string commandText, params MySqlParameter[] commandParameters)
{
//create & open a SqlConnection, and dispose of it after we are done.
using (MySqlConnection cn = new MySqlConnection(connectionString))
{
cn.Open();
//call the overload that takes a connection in place of the connection string
return ExecuteScalar(cn, commandText, commandParameters);
}
}
/// <summary>
/// Execute a single command against a MySQL database.
/// </summary>
/// <param name="connection"><see cref="MySqlConnection"/> object to use</param>
/// <param name="commandText">Command text to use for the command</param>
/// <returns>The first column of the first row in the result set, or a null reference if the result set is empty.</returns>
public static object ExecuteScalar(MySqlConnection connection, string commandText)
{
//pass through the call providing null for the set of MySqlParameters
return ExecuteScalar(connection, commandText, (MySqlParameter[])null);
}
/// <summary>
/// Execute a single command against a MySQL database.
/// </summary>
/// <param name="connection"><see cref="MySqlConnection"/> object to use</param>
/// <param name="commandText">Command text to use for the command</param>
/// <param name="commandParameters">Parameters to use for the command</param>
/// <returns>The first column of the first row in the result set, or a null reference if the result set is empty.</returns>
public static object ExecuteScalar(MySqlConnection connection, string commandText, params MySqlParameter[] commandParameters)
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = connection;
cmd.CommandText = commandText;
cmd.CommandType = CommandType.Text;
if (commandParameters != null)
foreach (MySqlParameter p in commandParameters)
cmd.Parameters.Add( p );
//execute the command & return the results
object retval = cmd.ExecuteScalar();
// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return retval;
}
#endregion
}
}
http://www.koders.com/csharp/fid01EA450A209966FCB52CA84DABB208DEF807D142.aspx
