"Scott Purcell" <[EMAIL PROTECTED]> wrote on 01/13/2005 01:05:01 PM:
> I understand the auto-increment capability, but how would one share > it amount three different tables? > > Would one have to do a rig, and create an extra table with increment > in it, then get that value to update table 1, then repeat process > again to get new increment and put it into table 2, etc.? > > I am used to asking for the sequence.nextId, then using it in any > table I need. > > Am I missing something here, or does someone know how to handle this > in multiple tables? > > Scott > > Nope, you aren't missing it. Auto_increment is table-specific. If you want to auto-generate a value so that no two-or-more tables share the same value, you will need to code that facility using table locks or transaction boundaries and a separate table. There is no global "sequence"-type object in MySQL. How you create and increment that number on your common table is up to you (add new records, read/increment/update, ...) But you _will_ need to either lock/unlock that sequencing table or wrap your get-next-number process inside a transaction so that you serialize access to the data on your sequencing table. Shawn Green Database Administrator Unimin Corporation - Spruce Pine > -----Original Message----- > From: Peter Brawley [mailto:[EMAIL PROTECTED] > Sent: Thursday, January 13, 2005 11:38 AM > To: Scott Purcell > Cc: mysql@lists.mysql.com > Subject: Re: create sequence > > > You want AUTO_INCREMENT, > http://dev.mysql.com/doc/mysql/en/example-AUTO_INCREMENT.html. > > PB > > ----- > > Scott Purcell wrote: > > >Hello, > > > >I would like to create a sequence object in mysql that I could use > in multiple tables through a application I am developing. > > > >Could someone please send my the syntax of how to create a simple > sequence that starts at 1 increments by 1. > > > >thanks, > > > > > > > > > > > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] >
