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| 1 | <?php |
| 2 | /** |
| 3 | * |
| 4 | * This file is part of the phpBB Forum Software package. |
| 5 | * |
| 6 | * @copyright (c) phpBB Limited <https://www.phpbb.com> |
| 7 | * @license GNU General Public License, version 2 (GPL-2.0) |
| 8 | * |
| 9 | * For full copyright and license information, please see |
| 10 | * the docs/CREDITS.txt file. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | namespace phpbb\db; |
| 15 | |
| 16 | /** |
| 17 | * Collects rows for insert into a database until the buffer size is reached. |
| 18 | * Then flushes the buffer to the database and starts over again. |
| 19 | * |
| 20 | * Benefits over collecting a (possibly huge) insert array and then using |
| 21 | * $db->sql_multi_insert() include: |
| 22 | * |
| 23 | * - Going over max packet size of the database connection is usually prevented |
| 24 | * because the data is submitted in batches. |
| 25 | * |
| 26 | * - Reaching database connection timeout is usually prevented because |
| 27 | * submission of batches talks to the database every now and then. |
| 28 | * |
| 29 | * - Usage of less PHP memory because data no longer needed is discarded on |
| 30 | * buffer flush. |
| 31 | * |
| 32 | * Attention: |
| 33 | * Please note that users of this class have to call flush() to flush the |
| 34 | * remaining rows to the database after their batch insert operation is |
| 35 | * finished. |
| 36 | * |
| 37 | * Usage: |
| 38 | * <code> |
| 39 | * $buffer = new \phpbb\db\sql_insert_buffer($db, 'test_table', 1234); |
| 40 | * |
| 41 | * while (do_stuff()) |
| 42 | * { |
| 43 | * $buffer->insert(array( |
| 44 | * 'column1' => 'value1', |
| 45 | * 'column2' => 'value2', |
| 46 | * )); |
| 47 | * } |
| 48 | * |
| 49 | * $buffer->flush(); |
| 50 | * </code> |
| 51 | */ |
| 52 | class sql_insert_buffer |
| 53 | { |
| 54 | /** @var \phpbb\db\driver\driver_interface */ |
| 55 | protected $db; |
| 56 | |
| 57 | /** @var string */ |
| 58 | protected $table_name; |
| 59 | |
| 60 | /** @var int */ |
| 61 | protected $max_buffered_rows; |
| 62 | |
| 63 | /** @var array */ |
| 64 | protected $buffer = array(); |
| 65 | |
| 66 | /** |
| 67 | * @param \phpbb\db\driver\driver_interface $db |
| 68 | * @param string $table_name |
| 69 | * @param int $max_buffered_rows |
| 70 | */ |
| 71 | public function __construct(\phpbb\db\driver\driver_interface $db, $table_name, $max_buffered_rows = 500) |
| 72 | { |
| 73 | $this->db = $db; |
| 74 | $this->table_name = $table_name; |
| 75 | $this->max_buffered_rows = $max_buffered_rows; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Inserts a single row into the buffer if multi insert is supported by the |
| 80 | * database (otherwise an insert query is sent immediately). Then flushes |
| 81 | * the buffer if the number of rows in the buffer is now greater than or |
| 82 | * equal to $max_buffered_rows. |
| 83 | * |
| 84 | * @param array $row |
| 85 | * |
| 86 | * @return bool True when some data was flushed to the database. |
| 87 | * False otherwise. |
| 88 | */ |
| 89 | public function insert(array $row) |
| 90 | { |
| 91 | $this->buffer[] = $row; |
| 92 | |
| 93 | // Flush buffer if it is full or when DB does not support multi inserts. |
| 94 | // In the later case, the buffer will always only contain one row. |
| 95 | if (!$this->db->get_multi_insert() || count($this->buffer) >= $this->max_buffered_rows) |
| 96 | { |
| 97 | return $this->flush(); |
| 98 | } |
| 99 | |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Inserts a row set, i.e. an array of rows, by calling insert(). |
| 105 | * |
| 106 | * Please note that it is in most cases better to use insert() instead of |
| 107 | * first building a huge rowset. Or at least count($rows) should be kept |
| 108 | * small. |
| 109 | * |
| 110 | * @param array $rows |
| 111 | * |
| 112 | * @return bool True when some data was flushed to the database. |
| 113 | * False otherwise. |
| 114 | */ |
| 115 | public function insert_all(array $rows) |
| 116 | { |
| 117 | // Using bitwise |= because PHP does not have logical ||= |
| 118 | $result = 0; |
| 119 | |
| 120 | foreach ($rows as $row) |
| 121 | { |
| 122 | $result |= (int) $this->insert($row); |
| 123 | } |
| 124 | |
| 125 | return (bool) $result; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Flushes the buffer content to the DB and clears the buffer. |
| 130 | * |
| 131 | * @return bool True when some data was flushed to the database. |
| 132 | * False otherwise. |
| 133 | */ |
| 134 | public function flush() |
| 135 | { |
| 136 | if (!empty($this->buffer)) |
| 137 | { |
| 138 | $this->db->sql_multi_insert($this->table_name, $this->buffer); |
| 139 | $this->buffer = array(); |
| 140 | |
| 141 | return true; |
| 142 | } |
| 143 | |
| 144 | return false; |
| 145 | } |
| 146 | } |