SQLite3::open

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SQLite3::open — Ouvre une base de données SQLite

Description

public SQLite3::open(string $filename, int $flags = SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE, string $encryptionKey = ""): void

Ouvre une base de données SQLite 3. Si le cryptage a été inclus lors de la construction de la base de données, la clé correspondante sera utilisée.

Liste de paramètres

filename

Chemin vers la base de données SQLite, ou :memory: pour utiliser la base de données se trouvant en mémoire vive.

flags

Drapeaux optionnels à utiliser pour déterminer la manière d'ouverture de la base de données SQLite. Par défaut, ce sera SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE.

SQLITE3_OPEN_READONLY : Ouvre la base de données en lecture seule.
SQLITE3_OPEN_READWRITE : Ouvre la base de données en lecture et écriture.
SQLITE3_OPEN_CREATE : Crée la base de données si elle n'existe pas.

encryptionKey

La clé optionnelle de cryptage utilisée lors du cryptage/décryptage de la base de données SQLite. Si le module SQLite de cryptage n'est pas installé, ce paramètre n'aura aucun effet.

Valeurs de retour

Aucune valeur n'est retournée.

Exemples

Exemple #1 Exemple avec SQLite3::open()

<?php
/**
 * Exemple simple qui étend la classe SQLite3 et change les paramètres
 * __construct, puis, utilise la méthode de connexion pour initialiser la
 * base de données.
 */
class MyDB extends SQLite3
{
    function __construct()
    {
        $this->open('mysqlitedb.db');
    }
}

$db = new MyDB();

$db->exec('CREATE TABLE foo (bar STRING)');
$db->exec("INSERT INTO foo (bar) VALUES ('Ceci est un test')");

$result = $db->query('SELECT bar FROM foo');
var_dump($result->fetchArray());
?>

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User Contributed Notes 4 notes

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jtreurniet at example dot com ¶

7 years ago


Note that the SQLITE3_OPEN_READONLY flag cannot be combined with the SQLITE3_OPEN_CREATE flag. If you combine both of these flags, a rather unhelpful "Unable to open database: out of memory" exception will be thrown.

down

susan at itsasmartsolve dot co dot za ¶

8 years ago


[Editor's note: see <https://www.sqlite.org/backup.html>]



Just a quick note on not being able to open() two databases together and copy the exact info, say for instance to create a backup db. I searched the net for and answer, none of which served. The comment and solution of attaching seems complicated to me. Eventually I worked out that the same result could be more simply accomplished using the copy() function.

<?php

copy("old.db", "new.db");

?>

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BenWa ¶

6 years ago


If you plan to have concurrent access to a SQLITE3 database, it is advised to change the default SQLite3::busyTimeout value (set to zero by default). Otherwise, you may get a "database locked" error while writing to the database.

With the timeout set to a non zero value, a write attempt to a locked database will wait for the lock to be released (within the timeout) before sending an error.

Note that the default value was set to 60 seconds on SQLITE2.

down

kbrobst at surveyresearchpartners dot com ¶

14 years ago


If you are trying to use the open() method to open multiple database files within the same SQLite3 object (which I could not get to work), here is an alternative way to do so using special SQLite3 syntax additions to the SQL language.  This took some investigation on my part, so hopefully the solution I found will help you too.



These are the nice features within SQLite3 that are leveraged: 

* The create statement query for a table is stored within a table called "sqlite_master" within the parent database file.

* SQLite3 supports the "insert into...select * from" SQL syntax for doing bulkload-speed inserts into a table - but what if the source and target tables are in separate database files?

* SQLite3 has an "attach [filename] as [reference database name]" which will allow multiple database files to be opened and accessible to the same SQLite3 object.



Assume you have a table called "my_template" in the SQLite3 database file "source.db".  You want to make a copy of this table into the database file "target.db" and call the table "working_table".



<?php

//attach the source database file to the bulkload connection object;

$bulkload_connection = new SQLite3("c:/sqlite3_database_files/source.db");



//retrieve the create statement query for the source table;

$sourcetbl_create_statement = $bulkload_connection->querySingle("select sql from sqlite_master where type='table' and name='my_template'");

if ($sourcetbl_create_statement===false) exit($bulkload_connection->lastErrorMsg());



//build the create statement query for the target table;

$targettbl_create_statement = str_replace('CREATE TABLE my_template', 'CREATE TABLE bulkload.working_table', $sourcetbl_create_statement);



//attach the target database file to the bulkload connection object - and reference it as the database called [bulkload];

$result=$bulkload_connection->exec("attach 'c:/sqlite3_database_files/target.db' as bulkload");

if ($result===false) exit($bulkload_connection->lastErrorMsg());



//issue the query to create the target table within the target database file;

$result=$bulkload_connection->exec($targettbl_create_statement);

if ($result===false) exit($bulkload_connection->lastErrorMsg());



//copy the rows from the source table to the target table as quickly as possible;

$result=$bulkload_connection->exec("insert into bulkload.working_table select * from my_template");

if ($result===false) exit($bulkload_connection->lastErrorMsg());



//release the OS file locks on the attached database files;

$bulkload_connection->close();

unset($bulkload_connection);

?>

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