PHP Manual


(PHP 5, PECL sqlite:1.0-1.0.3)

sqlite_popen — Opens a persistent handle to an SQLite database. Will create the database if it does not exist


resource sqlite_popen ( string $filename [, int $mode [, string $&errmessage ]] )

This function behaves identically to sqlite_open() except that is uses the persistent resource mechanism of PHP. For information about the meaning of the parameters, read the sqlite_open() manual page.

sqlite_popen() will first check to see if a persistent handle has already been opened for the given filename . If it finds one, it returns that handle to your script, otherwise it opens a fresh handle to the database.

The benefit of this approach is that you don't incurr the performance cost of re-reading the database and index schema on each page hit served by persistent web server SAPI's (any SAPI except for regular CGI or CLI).

Hinweis: If you use persistent handles and have the database updated by a background process (perhaps via a crontab), and that process re-creates the database by overwriting it (either by unlinking and rebuilding, or moving the updated version to replace the current version), you may experience undefined behaviour when a persistent handle on the old version of the database is recycled. To avoid this situation, have your background processes open the same database file and perform their updates in a transaction.

See also sqlite_popen(), sqlite_close() and sqlite_query().

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