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<?php | |
/** | |
* | |
* This file is part of the phpBB Forum Software package. | |
* | |
* @copyright (c) phpBB Limited <https://www.phpbb.com> | |
* @license GNU General Public License, version 2 (GPL-2.0) | |
* | |
* For full copyright and license information, please see | |
* the docs/CREDITS.txt file. | |
* | |
*/ | |
namespace phpbb\db; | |
/** | |
* Collects rows for insert into a database until the buffer size is reached. | |
* Then flushes the buffer to the database and starts over again. | |
* | |
* Benefits over collecting a (possibly huge) insert array and then using | |
* $db->sql_multi_insert() include: | |
* | |
* - Going over max packet size of the database connection is usually prevented | |
* because the data is submitted in batches. | |
* | |
* - Reaching database connection timeout is usually prevented because | |
* submission of batches talks to the database every now and then. | |
* | |
* - Usage of less PHP memory because data no longer needed is discarded on | |
* buffer flush. | |
* | |
* Attention: | |
* Please note that users of this class have to call flush() to flush the | |
* remaining rows to the database after their batch insert operation is | |
* finished. | |
* | |
* Usage: | |
* <code> | |
* $buffer = new \phpbb\db\sql_insert_buffer($db, 'test_table', 1234); | |
* | |
* while (do_stuff()) | |
* { | |
* $buffer->insert(array( | |
* 'column1' => 'value1', | |
* 'column2' => 'value2', | |
* )); | |
* } | |
* | |
* $buffer->flush(); | |
* </code> | |
*/ | |
class sql_insert_buffer | |
{ | |
/** @var \phpbb\db\driver\driver_interface */ | |
protected $db; | |
/** @var string */ | |
protected $table_name; | |
/** @var int */ | |
protected $max_buffered_rows; | |
/** @var array */ | |
protected $buffer = array(); | |
/** | |
* @param \phpbb\db\driver\driver_interface $db | |
* @param string $table_name | |
* @param int $max_buffered_rows | |
*/ | |
public function __construct(\phpbb\db\driver\driver_interface $db, $table_name, $max_buffered_rows = 500) | |
{ | |
$this->db = $db; | |
$this->table_name = $table_name; | |
$this->max_buffered_rows = $max_buffered_rows; | |
} | |
/** | |
* Inserts a single row into the buffer if multi insert is supported by the | |
* database (otherwise an insert query is sent immediately). Then flushes | |
* the buffer if the number of rows in the buffer is now greater than or | |
* equal to $max_buffered_rows. | |
* | |
* @param array $row | |
* | |
* @return bool True when some data was flushed to the database. | |
* False otherwise. | |
*/ | |
public function insert(array $row) | |
{ | |
$this->buffer[] = $row; | |
// Flush buffer if it is full or when DB does not support multi inserts. | |
// In the later case, the buffer will always only contain one row. | |
if (!$this->db->get_multi_insert() || count($this->buffer) >= $this->max_buffered_rows) | |
{ | |
return $this->flush(); | |
} | |
return false; | |
} | |
/** | |
* Inserts a row set, i.e. an array of rows, by calling insert(). | |
* | |
* Please note that it is in most cases better to use insert() instead of | |
* first building a huge rowset. Or at least count($rows) should be kept | |
* small. | |
* | |
* @param array $rows | |
* | |
* @return bool True when some data was flushed to the database. | |
* False otherwise. | |
*/ | |
public function insert_all(array $rows) | |
{ | |
// Using bitwise |= because PHP does not have logical ||= | |
$result = 0; | |
foreach ($rows as $row) | |
{ | |
$result |= (int) $this->insert($row); | |
} | |
return (bool) $result; | |
} | |
/** | |
* Flushes the buffer content to the DB and clears the buffer. | |
* | |
* @return bool True when some data was flushed to the database. | |
* False otherwise. | |
*/ | |
public function flush() | |
{ | |
if (!empty($this->buffer)) | |
{ | |
$this->db->sql_multi_insert($this->table_name, $this->buffer); | |
$this->buffer = array(); | |
return true; | |
} | |
return false; | |
} | |
} |