*/
public function create_items_table();
+ /*
+ * returns true if $usrname is name of an existing user, false otherwise.
+ */
+ public function user_exists ($usrname);
+
/*
* set password $pwd for user $usrname. If $usrname does not exist, create
* it.
+ * throws an err_query error in case $pwd is null
*/
public function setpwd($usrname, $pwd);