SQLite3::backup

(PHP 7 >= 7.4.0, PHP 8)

SQLite3::backup — Backup one database to another database

说明

public SQLite3::backup(SQLite3 $destination, string $sourceDatabase = "main", string $destinationDatabase = "main"): bool

SQLite3::backup() copies the contents of one database into another, overwriting the contents of the destination database. It is useful either for creating backups of databases or for copying in-memory databases to or from persistent files.

小技巧

As of SQLite 3.27.0 (2019-02-07), it is also possible to use the statement VACUUM INTO 'file.db'; to backup the database to a new file.

参数

destination: A database connection opened with SQLite3::open().
sourceDatabase: The database name is "main" for the main database, "temp" for the temporary database, or the name specified after the AS keyword in an ATTACH statement for an attached database.
destinationDatabase: Analogous to sourceDatabase but for the destination.

返回值

成功时返回 true，或者在失败时返回 false。

示例

示例 #1 Backup an existing database

<?php
// $conn is a connection to an already opened sqlite3 database

$backup = new SQLite3('backup.sqlite');
$conn->backup($backup);
?>

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