Question

i have problems with a sql command in mysql. I have a asp.net applcation and use a mysql database as database. I want to built a class that can insert,update,delete and select the records in the database. I have problems with the update command. In phpmyadmin it works but in my class not :/

Here is my code

public void UpdateRecord(string title, string firstname, string lastname, string company,
                               string timefrom, string timeto)
        {
            connection = new MySqlConnection();

            try
            {
                MySqlCommand command = connection.CreateCommand();

                //for testing
                string sql = "UPDATE 'tb_gast' SET FIRSTNAME='test' WHERE ID=270";

                command.CommandText = sql;

                connection.Open();

                command.ExecuteNonQuery();

            }
            catch (Exception)
            {

            }
            finally
            {
                connection.Close();
            }
        }

this command work in phpmyadmin

UPDATE `tb_gast` 
SET 
FIRSTNAME='uu',
LASTNAME='uu',
COMPANY='uu'
WHERE ID=270

Answer 1

You are using single quote around the tablename, instead of backticks.
The backtick could be typed using the key combination ALT+096

UPDATE `tb_gast` SET FIRSTNAME = 'test' WHERE ID=270

EDIT: Looking at your question more in deep.
Noticed that you declare a MySqlConnection and initialize it WITHOUT any connection strings.
If this is your real code no wonder that it doesn’t work

This is how your code should be

        using(connection = new MySqlConnection(GetConnectionString())
        {
            connection.Open();
            using(MySqlCommand command = connection.CreateCommand();
            {
                //for testing
                string sql = "UPDATE `tb_gast` SET FIRSTNAME='test' WHERE ID=270";
                command.CommandText = sql;
                command.ExecuteNonQuery();
            }
        }

where GetConnectionString() should be some method that returns your connection string from some permanent storage like a configuration file