PDO::pgsqlLOBUnlink
If there is anyone using PDO to interface with SQLite and wondering how to create an SQLite database to begin with; if they're thinking they'll have to detour into one of the other SQLite interfaces to get the job done - nope!
PDO does need a SQLite database file to exist before it can connect, but that file can be a completely empty one; so a single touch() is enough to create a brand new virgin SQLite database ready to receive your CREATE TABLE statements.
Fonctions SQLite (PDO_SQLITE)
Introduction
PDO_ODBC est un pilote qui implémente l'interface de PHP Data Objects (PDO) pour autoriser l'accès de PHP aux bases de données SQLite 3.
Dans PHP 5.1, l'extension SQLite fournit aussi le pilote pour les bases de données SQLite 2; bien que ce ne soit pas techniquement une partie du pilote de PDO_SQLITE, il se comporte similairement, donc il est documenté a côté de ce pilote. Le pilote SQLite 2 pour PDO est fourni principalement pour rendre plus facile l'importation de l'ancien format SQLite 2 des fichiers de base de données dans une application qui utilisent le pilote SQLite 3 qui est plus rapide et plus efficace. En conséquence, le pilote SQLite 2 n'est pas aussi riche en fonctionnalité que le pilote SQLite 3.
Note:
PDO_SQLITE autorise l'utilisation de chaînes en dehors des flux avec
PDO::PARAM_LOB.
Installation
Le driver PDO PDO_SQLITE est actif par défaut. Pour le désactiver, utilisez l'option de compilation --without-pdo-sqlite[=DIR] , où [=DIR] (optionnel) représente le chemin vers le dossier d'installation de base de sqlite.
Sommaire
- PDO_SQLITE DSN — Connexion aux bases de données SQLite
- PDO::sqliteCreateAggregate — Référence une fonction définie par l'utilisateur agrégative pour une utilisation dans les requêtes SQL
- PDO::sqliteCreateFunction — Référence une fonction définie par l'utilisateur pour une utilisation dans les requêtes SQL
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User Contributed Notes
SQLite (PDO)
Hayley Watson
25-Sep-2011 07:31
gopal at gopalarathnam dot com
27-Mar-2007 02:36
If you get an error reporting "invalid resource" when trying to query the database table and looping through it, the version of the SQLite extension compiled in to PHP might be incompatible with the version that had created the database (like SQLite 2.x vs 3.x).
The database open itself might be successful, failing only when querying.
$dbh = new PDO('sqlite:/tmp/foo.db'); // success
foreach ($dbh->query('SELECT * FROM bar') as $row) // prints invalid resource
// ...
gmac63 at charter dot net
10-Aug-2006 07:38
Issue:
Error: SQLSTATE[HY000]: General error: 1 unsupported file format
Resolution:
To solve this (and/or many issues) involving this type of error, I assumed the error to be generated from php. Well, it was to an extent. The sqlite pdo code offered the solution:
I researched the error by grep'ing the php source code and found the error string to come from php-5.1.4/ext/pdo_sqlite/sqlite/src/prepare.c, lines 265:278 :
/*
** file_format==1 Version 3.0.0.
** file_format==2 Version 3.1.3.
** file_format==3 Version 3.1.4.
**
** Version 3.0 can only use files with file_format==1. Version 3.1.3
** can read and write files with file_format==1 or file_format==2.
** Version 3.1.4 can read and write file formats 1, 2 and 3.
*/
if( meta[1]>3 ){
sqlite3BtreeCloseCursor(curMain);
sqlite3SetString(pzErrMsg, "unsupported file format", (char*)0);
return SQLITE_ERROR;
}
This is interesting as I am running SQLite version 3.3.5 which the databases were created in. I see that the SQLite PDO source in the php source is :
# cat ext/pdo_sqlite/sqlite/VERSION
3.2.8
My solution was then to find a version of sqlite that was =< 3.1.4. I found source for 3.1.3, compiled, recreated my database using that version (NOTE: the databases are unsupported between 3.1.x and 3.2.x versions of SQLite). Once I did this it worked.
Also as a side note, to get SQLite compiled as a PDO, I had to:
1) configure with
...
--enable-pdo=shared \
--with-sqlite=shared \
--with-pdo-sqlite=shared
--with-zlib
... \
'make && make install' if configure is successful.
2) Make sure the pdo libs were copied/installed to the correct directory. On my installation it was /usr/local/include/php/ext/pdo/
3) Make these changes in my php.ini:
- change ' extension_dir = "./" ' to ' extension_dir="/usr/local/include/php/ext/pdo/" '
- add/edit in this order:
extension=pdo.so
extension=pdo_sqlite.so
extension=sqlite.so
4) test php with : 'php -m' at the command line and solve any issues from there. Mostly php.ini config issues. Also restart the http service!
Duffalo
06-Jul-2006 04:41
Note that as of the date of this post, PDO_SQLITE will not interact with database files created with the current version of the SQLite console application, sqlite-3.3.6.
It is currently necessary to obtain version 3.2.8, available from http://www.sqlite.org/ but only by entering the URI manually, as there is no link. Go to http://www.sqlite.org/download.html and find the URI of the version you're looking for, then make the appropriate version number substitution.
aidan at php dot net
01-Oct-2005 02:36
If you receive an error while trying to write to a sqlite database (update, delete, drop):
Warning: PDO::query() [function.query]: SQLSTATE[HY000]: General error: 1 unable to open database
The folder that houses the database file must be writeable.