auto-increment

I have realised that mnesia doesnot support auto-increment feature as does MySQL or other RDBMS do.The counters talked about in mnesia documentation are not really well explained. forexample i have found sofar one function in the entire documentation which manipulates counters mnesia:dirty_update_counter({Tab::atom(),Key::any()}, Val::positive_integer()) So, this has disturbed me for a time coz it works with records of type {TabName, Key, Integer} This is also unclear and possibly because no erlang book or mnesia documentation provides an example to explain it.This has forced me to implement

I have a lot of tables and because of some reasons I need to adjust auto increment value for this tables on application startup. I try to do this: mysql> select max(id) from item; +----------+ | max(id) | +----------+ | 97972232 | +----------+ 1 row in set (0.05 sec) mysql> alter table item auto_increment=1097972232; In another session: afrolov@A1-DB1:~$ mysql -u root -e "show processlist" | grep auto_increment 472196 root localhost test Query 39 copy to tmp table alter table item auto_increment=1097972232 MySQL is starting to rebuild table! Why MySQL need to do it? How can I avoid rebuilding

I always hear that using "lastInsertId" (or mysql_insert_id() if you're not using PDO) is evil. In case of triggers it obviously is, because it could return something that's totally not the last ID that your INSERT created. $DB->exec("INSERT INTO example (column1) VALUES ('test')"); // Usually returns your newly created ID. // However when a TRIGGER inserts into another table with auto-increment: // -> Returns newly created ID of trigger's INSERT $id = $DB->lastInsertId(); What's the alternative? If you go the route of ADOdb ( http://adodb.sourceforge.net/ ), then you can create the insert ID

This is what I'm trying to do: I have 2 tables... CREATE TABLE `parent` ( `id` int(11) NOT NULL AUTO_INCREMENT, `data` text, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8; CREATE TABLE `child` ( `parent_id` int(11) DEFAULT NULL, `related_ids` int(11) DEFAULT NULL, KEY `parent_id` (`parent_id`), KEY `related_ids` (`related_ids`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; And then a constraint: ALTER TABLE `parent` ADD FOREIGN KEY (`id`) REFERENCES `child` (`parent_id`); As you can see the table parent has an auto-incremented primary key "id", which is also being used as a

Hey! Just started working with Pylons in conjunction with SQLAlchemy, and my model looks something like this: from sqlalchemy import Column from sqlalchemy.types import Integer, String from helloworld.model.meta import Base class Person(Base): __tablename__ = "person" id = Column(Integer, primary_key=True) name = Column(String(100)) email = Column(String(100)) def __init__(self, name='', email=''): self.name = name self.email = email def __repr__(self): return "<Person('%s')" % self.name To avoid sqlite reusing id's that might have been deleted, I want to add AUTOINCREMENT to the column "id".

ok this isn't spamming and it's supposed to be simple I don't know why it's not working this is my code: gamesdatabase = openOrCreateDatabase("GamesDatabase", MODE_PRIVATE, null); gamesdatabase.execSQL("CREATE TABLE IF NOT EXISTS Games (ID INTEGER PRIMARY KEY, Name VARACHAR, NPlayers INT(1), NRounds INT(2), WinScore INT(2));"); gamesdatabase.execSQL("INSERT INTO Games (ID, Name, NPlayers, NRounds, WinScore ) VALUES ( NULL, 'TAWLA',2,0,0 );"); gamesdatabase.execSQL("INSERT INTO Games (ID, Name, NPlayers, NRounds, WinScore ) VALUES ( NULL, 'DOMANA',4,0,0 );"); Cursor c = gamesdatabase.rawQuery(