Drush sql-* civicrm commands dont work

I'm new to civicrm, but it appears the drush sql commands dont work, at least with drush 6.

I've given an example of the change that I have tested to fix this. Essentially, not returning the drush_sql_command result causes nothing to get printed.

/**

• Implementation of drush_hook_COMMAND_validate for command 'civicrm-sql-connect'
  */
  function drush_civicrm_pre_civicrm_sql_connect() { _civicrm_dsn_init(); }

/**

• Implementation of command 'civicrm-sql-connect'
  */
  function drush_civicrm_sqlconnect() { return drush_sql_connect(); }

function drush_civicrm_post_civicrm_sql_connect()

{ _civicrm_dsn_close(); }