Why not create it under a random name, and then rename after creation? Noah Hart
-----Original Message----- From: Ron Stevens [mailto:[EMAIL PROTECTED] Sent: Tuesday, February 13, 2007 10:59 AM To: sqlite-users@sqlite.org Subject: Re: [sqlite] Atomically creating a database and bootstrapping its tables > No, you have to do that in your application. > > In pseudo code your create function could do this: > > open the database file > begin an exclusive transaction (since you may need to write to > initialize the tables) > read the user_version > if the user version is not zero > create the tables (read SQL script into a string and pass the > string to sqlite3_exec) > set the user version to a non zero value > endif > commit the transaction > > Only one process will succeed in getting the write lock while opening > the transaction. That process will create the tables and set the > user_version so no other process will try to reinitialize the tables latter. That solves the problem of two processes bootstrapping the database, but is it possible for the second process to open the database while the first is in the process of creating it (creating the header pages, the system tables, etc) and view the database as corrupt since it isn't fully created yet? I imagine there is at least a small window between when the file is first created and when the file lock is acquired on it, but I'm wondering how big that window is (or does it not exist?). ------------------------------------------------------------------------ ----- To unsubscribe, send email to [EMAIL PROTECTED] ------------------------------------------------------------------------ ----- CONFIDENTIALITY NOTICE: This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
