Funciones de SQLite (PDO_SQLITE)

Introducción

PDO_SQLITE es un controlador que implementa la interfaz Objetos de Datos de PHP (PDO, siglas en inglés de PHP Data Objects) para habilitar el acceso a bases de datos de SQLite 3.

Nota:
PDO_SQLITE permite usar cadenas aparte de flujos junto con PDO::PARAM_LOB.

Instalación

El controlador PDO_SQLITE PDO está habilitado por omisión. Para deshabilitarlo, se puede usar --without-pdo-sqlite[=DIR], donde el parámetro opcional [=DIR] es el directorio base de instalación de sqlite. A partir de PHP 7.4.0 se requiere » libsqlite ≥ 3.5.0. Anteriormente, si libsqlite incluido podría haberse usado en su lugar, por omisión, si [=DIR] era omitido.

Tabla de contenidos

PDO_SQLITE DSN — Conectar a las bases de datos de SQLite
PDO::sqliteCreateAggregate — Registra una función acumuladora definida por el usuario para usarla en sentencias SQL
PDO::sqliteCreateCollation — Registra una función definida por el usuario para emplearla como función de cotejo en sentencias SQL
PDO::sqliteCreateFunction — Registra una función definida por el usuario para utilizarla en sentencias SQL

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User Contributed Notes 4 notes

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ohcc at 163 dot com ¶

4 years ago

With PDO SQLite driver, calculation within an SQL with multiple ? may not get results as you expect.

<?php
// ....
$stmt = $PDO->prepare('SELECT * FROM `X` WHERE `TimeUpdated`+?>?');
$stmt->execute([3600, time()]);
$data = $stmt->fetchAll();
print_r($data);
?>

To get the right results, you have more than 3 solutions.

1. Change 'SELECT * FROM `X` WHERE `TimeUpdated`+?>?' to 'SELECT * FROM `X` WHERE `TimeUpdated`>?' and do the math using Php (ie: $stmt->execute([time()-3600]); ).

2. Use PdoStatement::bindParam or PdoStatement::bindValue, and set the parameter type to PDO::PARAM_INT.

3. Change 'SELECT * FROM `X` WHERE `TimeUpdated`+?>?' to 'SELECT * FROM `X` WHERE `TimeUpdated`+?>?+0', here '?+0' may be replaced by another math function or another calculation, such as 'abs(?)', you can even wrap both ? with a math calculation.

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aidan at php dot net ¶

19 years ago

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.

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nospam8715 at dririan dot com ¶

11 years ago

Instead of compiling an old version of SQLite to create a database using an older database format that the version of SQLite bundled with PDO can handle, you can (much more easily) just run the query "PRAGMA legacy_file_format = TRUE;" BEFORE creating the database (if you have an existing database, run ".dump" from the sqlite shell on your database, run the sqlite shell on a new database, run the PRAGMA, then paste the contents of the .dump). That will ensure SQLite creates a database readable by SQLite 3.0 and later.

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Duffalo ¶

18 years ago

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.

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