PHPCon Poland 2024

SQLite (PDO_SQLITE) İşlevleri

Giriş

PDO_SQLITE, PHP Veri Nesneleri Arayüzünün (PDO) SQLite 3 veritabanlarına erişimini mümkün kılmak için gerçeklenmiş bir sürücüdür.

Bilginize:

PDO_SQLITE dizgelerin akımlardan ayrı olarak PDO::PARAM_LOB ile birlikte kullanımını mümkün kılar.

Kurulum

The PDO_SQLITE PDO driver is enabled by default. To disable, --without-pdo-sqlite[=DIR] may be used, where the optional [=DIR] is the sqlite base install directory. As of PHP 7.4.0 » libsqlite ≥ 3.5.0 is required. Formerly, the bundled libsqlite could have been used instead, and was the default, if [=DIR] has been omitted.

Bilginize: Additional setup on Windows as of PHP 7.4.0

Bu eklentinin çalışabilmesi için bazı DLL dosyalarının bulunduğu yerlerin Windows sistem PATH'ında tanımlı olması gerekir. Bunun nasıl yapılacağı SSS altında "PHP dizinimi Windows'ta PATH'a nasıl eklerim" başlığı altında açıklanmıştır. Eklenti, DLL dosyaları PHP dizininden Windows system dizinine taşındığında da çalışırsa da (çünkü system dizini sistem PATH'ında zaten vardır) bu önerilmez. Bu eklentinin çalışabilmesi için bulunduğu dizine PATH üzerinden erişebilmesi gereken dosyanın ismi: libsqlite3.dll.

İçindekiler

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User Contributed Notes 4 notes

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10
aidan at php dot net
18 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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4
ohcc at 163 dot com
3 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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4
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.
up
-1
Duffalo
17 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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