connect method
Establishes a new database connection.
The connectionString should be a valid ODBC connection string
(e.g., 'DSN=MyDatabase' or 'Driver={SQL Server};Server=...').
Returns a connection ID on success, 0 on failure. Throws StateError if the environment has not been initialized.
Implementation
int connect(String connectionString) {
if (!_isInitialized) {
throw StateError('Environment not initialized');
}
return _native.connect(connectionString);
}