clouddueling/mysqldump-php

PHP version of mysqldump cli that comes with MySQL

v2.7 2019-02-18 23:38 UTC

README

Requirements | Installing | Getting started | API | Settings | PDO Settings | TODO | License | Credits

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This is a php version of mysqldump cli that comes with MySQL, without dependencies, output compression and sane defaults.

Out of the box, MySQLDump-PHP supports backing up table structures, the data itself, views, triggers and events.

MySQLDump-PHP is the only library that supports:

  • output binary blobs as hex.
  • resolves view dependencies (using Stand-In tables).
  • output compared against original mysqldump. Linked to travis-ci testing system (testing from php 5.3 to 7.1 & hhvm)
  • dumps stored routines (functions and procedures).
  • dumps events.
  • does extended-insert and/or complete-insert.
  • supports virtual columns from MySQL 5.7.
  • does insert-ignore, like a REPLACE but ignoring errors if a duplicate key exists.
  • modifying data from database on-the-fly when dumping, using hooks.
  • can save directly to google cloud storage over a compressed stream wrapper (GZIPSTREAM).

Important

From version 2.0, connections to database are made using the standard DSN, documented in PDO connection string.

Requirements

  • PHP 5.3.0 or newer
  • MySQL 4.1.0 or newer
  • PDO

Installing

Using Composer:

$ composer require ifsnop/mysqldump-php

Using Curl to always download and decompress the latest release:

$ curl --silent --location https://api.github.com/repos/ifsnop/mysqldump-php/releases | grep -i tarball_url | head -n 1 | cut -d '"' -f 4 | xargs curl --location --silent | tar xvz

Getting started

With Autoloader/Composer:

<?php

use Ifsnop\Mysqldump as IMysqldump;

try {
    $dump = new IMysqldump\Mysqldump('mysql:host=localhost;dbname=testdb', 'username', 'password');
    $dump->start('storage/work/dump.sql');
} catch (\Exception $e) {
    echo 'mysqldump-php error: ' . $e->getMessage();
}

Plain old PHP:

<?php

    include_once(dirname(__FILE__) . '/mysqldump-php-2.0.0/src/Ifsnop/Mysqldump/Mysqldump.php');
    $dump = new Ifsnop\Mysqldump\Mysqldump('mysql:host=localhost;dbname=testdb', 'username', 'password');
    $dump->start('storage/work/dump.sql');

Refer to the wiki for some examples and a comparision between mysqldump and mysqldump-php dumps.

Changing values when exporting

You can register a callable that will be used to transform values during the export. An example use-case for this is removing sensitive data from database dumps:

$dumper = new IMysqldump\Mysqldump('mysql:host=localhost;dbname=testdb', 'username', 'password');

$dumper->setTransformColumnValueHook(function ($tableName, $colName, $colValue) {
    if ($colName === 'social_security_number') {
        return (string) rand(1000000, 9999999);
    }

    return $colValue;
});

$dumper->start('storage/work/dump.sql');

Table specific export conditions

You can register table specific 'where' clauses to limit data on a per table basis. These override the default where dump setting:

$dumper = new IMysqldump\Mysqldump('mysql:host=localhost;dbname=testdb', 'username', 'password');

$dumper->setTableWheres(array(
    'users' => 'date_registered > NOW() - INTERVAL 3 MONTH AND deleted=0',
    'logs' => 'date_logged > NOW() - INTERVAL 1 DAY',
    'posts' => 'isLive=1'
));

Table specific export limits

You can register table specific 'limits' to limit the returned rows on a per table basis:

$dumper = new IMysqldump\Mysqldump('mysql:host=localhost;dbname=testdb', 'username', 'password');

$dumper->setTableLimits(array(
    'users' => 300,
    'logs' => 50,
    'posts' => 10
));

Constructor and default parameters

/**
 * Constructor of Mysqldump. Note that in the case of an SQLite database
 * connection, the filename must be in the $db parameter.
 *
 * @param string $dsn        PDO DSN connection string
 * @param string $user       SQL account username
 * @param string $pass       SQL account password
 * @param array  $dumpSettings SQL database settings
 * @param array  $pdoSettings  PDO configured attributes
 */
public function __construct(
    $dsn = '',
    $user = '',
    $pass = '',
    $dumpSettings = array(),
    $pdoSettings = array()
)

$dumpSettingsDefault = array(
    'include-tables' => array(),
    'exclude-tables' => array(),
    'compress' => Mysqldump::NONE,
    'init_commands' => array(),
    'no-data' => array(),
    'reset-auto-increment' => false,
    'add-drop-database' => false,
    'add-drop-table' => false,
    'add-drop-trigger' => true,
    'add-locks' => true,
    'complete-insert' => false,
    'databases' => false,
    'default-character-set' => Mysqldump::UTF8,
    'disable-keys' => true,
    'extended-insert' => true,
    'events' => false,
    'hex-blob' => true, /* faster than escaped content */
    'insert-ignore' => false,
    'net_buffer_length' => self::MAXLINESIZE,
    'no-autocommit' => true,
    'no-create-info' => false,
    'lock-tables' => true,
    'routines' => false,
    'single-transaction' => true,
    'skip-triggers' => false,
    'skip-tz-utc' => false,
    'skip-comments' => false,
    'skip-dump-date' => false,
    'skip-definer' => false,
    'where' => '',
    /* deprecated */
    'disable-foreign-keys-check' => true
);

$pdoSettingsDefaults = array(
    PDO::ATTR_PERSISTENT => true,
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => false
);

// missing settings in constructor will be replaced by default options
$this->_pdoSettings = self::array_replace_recursive($pdoSettingsDefault, $pdoSettings);
$this->_dumpSettings = self::array_replace_recursive($dumpSettingsDefault, $dumpSettings);

Dump Settings

The following options are now enabled by default, and there is no way to disable them since they should always be used.

PDO Settings

Errors

To dump a database, you need the following privileges :

  • SELECT
    • In order to dump table structures and data.
  • SHOW VIEW
    • If any databases has views, else you will get an error.
  • TRIGGER
    • If any table has one or more triggers.
  • LOCK TABLES
    • If "lock tables" option was enabled.

Use SHOW GRANTS FOR user@host; to know what privileges user has. See the following link for more information:

Which are the minimum privileges required to get a backup of a MySQL database schema?

Tests

Current code for testing is an ugly hack. Probably there are much better ways of doing them using PHPUnit, so PR's are welcomed. The testing script creates and populates a database using all possible datatypes. Then it exports it using both mysqldump-php and mysqldump, and compares the output. Only if it is identical tests are OK. After this commit, some test are performed using phpunit.

Some tests are skipped if mysql server doesn't support them.

A couple of tests are only comparing between original sql code and mysqldump-php generated sql, because some options are not available in mysqldump.

Bugs (from mysqldump, not from mysqldump-php)

After this bug report, a new one has been introduced. _binary is appended also when hex-blob option is used, if the value is empty.

Backporting

mysqldump-php is not backwards compatible with php 5.2 because we it uses namespaces. However, it could be trivially fixed if needed.

Todo

Write more tests, test with mariadb also.

Contributing

Format all code to PHP-FIG standards. https://www.php-fig.org/

License

This project is open-sourced software licensed under the GPL license

Credits

After more than 8 years, there is barely anything left from the original source code, but:

Originally based on James Elliott's script from 2009. https://code.google.com/archive/p/db-mysqldump/

Adapted and extended by Michael J. Calkins. https://github.com/clouddueling

Currently maintained, developed and improved by Diego Torres. https://github.com/ifsnop