vendor/doctrine/dbal/lib/Doctrine/DBAL/Id/TableGenerator.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\DBAL\Id;

use Doctrine\DBAL\DriverManager;
use Doctrine\DBAL\Connection;

/**
 * Table ID Generator for those poor languages that are missing sequences.
 *
 * WARNING: The Table Id Generator clones a second independent database
 * connection to work correctly. This means using the generator requests that
 * generate IDs will have two open database connections. This is necessary to
 * be safe from transaction failures in the main connection. Make sure to only
 * ever use one TableGenerator otherwise you end up with many connections.
 *
 * TableID Generator does not work with SQLite.
 *
 * The TableGenerator does not take care of creating the SQL Table itself. You
 * should look at the `TableGeneratorSchemaVisitor` to do this for you.
 * Otherwise the schema for a table looks like:
 *
 * CREATE sequences (
 *   sequence_name VARCHAR(255) NOT NULL,
 *   sequence_value INT NOT NULL DEFAULT '1',
 *   sequence_increment_by INT NOT NULL DEFAULT '1',
 *   PRIMARY KEY (table_name)
 * );
 *
 * Technically this generator works as follows:
 *
 * 1. Use a robust transaction serialization level.
 * 2. Open transaction
 * 3. Acquire a read lock on the table row (SELECT .. FOR UPDATE)
 * 4. Increment current value by one and write back to database
 * 5. Commit transaction
 *
 * If you are using a sequence_increment_by value that is larger than one the
 * ID Generator will keep incrementing values until it hits the incrementation
 * gap before issuing another query.
 *
 * If no row is present for a given sequence a new one will be created with the
 * default values 'value' = 1 and 'increment_by' = 1