which drupal files are responsible for the database connectivity in drupal
Configuration of db connection (and configs of other things) is in YOUR_DRUPAL_FOLDER/sites/default/settings.php file
DB code files are in YOUR_DRUPAL_FOLDER/includes folder (database.inc, database.mysqli.inc, database.mysql.inc, database.pgsql.inc files)
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Configuration of db
Configuration of db connection (and configs of other things) is in YOUR_DRUPAL_FOLDER/sites/default/settings.php file
DB code files are in YOUR_DRUPAL_FOLDER/includes folder (database.inc, database.mysqli.inc, database.mysql.inc, database.pgsql.inc files)
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