How to Correctly Construct a MySQL Connection String to Avoid Connection Errors?

How to Construct a Valid MySQL Connection String

When trying to establish a connection to a MySQL database, you may encounter errors such as "there is no MySQL host with these parameters." This indicates a misconfiguration in your connection string.

To resolve this issue, follow these steps to create a correct MySQL connection string:

1. Use the MySqlConnectionStringBuilder class to programmatically build the connection string:

   MySqlConnectionStringBuilder conn_string = new MySqlConnectionStringBuilder();

2. Set the server, user ID, password, and database properties:

   conn_string.Server = "mysql7.000webhost.com";
   conn_string.UserID = "a455555_test";
   conn_string.Password = "a455555_me";
   conn_string.Database = "xxxxxxxx";

3. Convert the connection string builder to a connection string:

   string connectionString = conn_string.ToString();

4. Establish the connection using a MySqlConnection object:

   using (MySqlConnection conn = new MySqlConnection(connectionString))

5. Create a command object and set the command text:

   using (MySqlCommand cmd = conn.CreateCommand())
   {
       //watch out for this SQL injection vulnerability below
       cmd.CommandText = string.Format("INSERT Test (lat, long) VALUES ({0},{1})",
                                       OSGconv.deciLat, OSGconv.deciLon);
   }

6. Open the connection and execute the command:

   conn.Open();
   cmd.ExecuteNonQuery();

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