buildCheckValues method
Returns a SELECT statement to check current values of all options. When running the query, parameters that were not yet set will return null.
Implementation
String buildCheckValues() {
var optionsList = options.keys
.map((k) => "current_setting('$k', true) as ${k.replaceAll('.', '_')}")
.join(', ');
return 'SELECT $optionsList;';
}