[6] | 1 | <?php |
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| 2 | |
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| 3 | /** |
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| 4 | * Copyright (C) 2008-2011 FluxBB |
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| 5 | * based on code by Rickard Andersson copyright (C) 2002-2008 PunBB |
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| 6 | * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher |
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| 7 | */ |
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| 8 | |
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| 9 | // Make sure we have built in support for SQLite |
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| 10 | if (!function_exists('sqlite_open')) |
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| 11 | exit('This PHP environment doesn\'t have SQLite support built in. SQLite support is required if you want to use a SQLite database to run this forum. Consult the PHP documentation for further assistance.'); |
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| 12 | |
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| 13 | |
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| 14 | class DBLayer |
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| 15 | { |
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| 16 | var $prefix; |
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| 17 | var $link_id; |
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| 18 | var $query_result; |
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| 19 | var $in_transaction = 0; |
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| 20 | |
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| 21 | var $saved_queries = array(); |
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| 22 | var $num_queries = 0; |
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| 23 | |
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| 24 | var $error_no = false; |
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| 25 | var $error_msg = 'Unknown'; |
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| 26 | |
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| 27 | var $datatype_transformations = array( |
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| 28 | '%^SERIAL$%' => 'INTEGER', |
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| 29 | '%^(TINY|SMALL|MEDIUM|BIG)?INT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'INTEGER', |
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| 30 | '%^(TINY|MEDIUM|LONG)?TEXT$%i' => 'TEXT' |
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| 31 | ); |
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| 32 | |
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| 33 | |
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| 34 | function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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| 35 | { |
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| 36 | // Prepend $db_name with the path to the forum root directory |
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| 37 | $db_name = PUN_ROOT.$db_name; |
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| 38 | |
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| 39 | $this->prefix = $db_prefix; |
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| 40 | |
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| 41 | if (!file_exists($db_name)) |
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| 42 | { |
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| 43 | @touch($db_name); |
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| 44 | @chmod($db_name, 0666); |
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| 45 | if (!file_exists($db_name)) |
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| 46 | error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__); |
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| 47 | } |
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| 48 | |
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| 49 | if (!is_readable($db_name)) |
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| 50 | error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__); |
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| 51 | |
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| 52 | if (!is_writable($db_name)) |
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| 53 | error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__); |
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| 54 | |
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| 55 | if ($p_connect) |
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| 56 | $this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error); |
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| 57 | else |
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| 58 | $this->link_id = @sqlite_open($db_name, 0666, $sqlite_error); |
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| 59 | |
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| 60 | if (!$this->link_id) |
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| 61 | error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__); |
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| 62 | else |
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| 63 | return $this->link_id; |
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| 64 | } |
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| 65 | |
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| 66 | |
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| 67 | function start_transaction() |
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| 68 | { |
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| 69 | ++$this->in_transaction; |
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| 70 | |
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| 71 | return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false; |
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| 72 | } |
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| 73 | |
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| 74 | |
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| 75 | function end_transaction() |
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| 76 | { |
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| 77 | --$this->in_transaction; |
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| 78 | |
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| 79 | if (@sqlite_query($this->link_id, 'COMMIT')) |
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| 80 | return true; |
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| 81 | else |
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| 82 | { |
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| 83 | @sqlite_query($this->link_id, 'ROLLBACK'); |
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| 84 | return false; |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | |
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| 89 | function query($sql, $unbuffered = false) |
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| 90 | { |
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| 91 | if (defined('PUN_SHOW_QUERIES')) |
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| 92 | $q_start = get_microtime(); |
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| 93 | |
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| 94 | if ($unbuffered) |
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| 95 | $this->query_result = @sqlite_unbuffered_query($this->link_id, $sql); |
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| 96 | else |
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| 97 | $this->query_result = @sqlite_query($this->link_id, $sql); |
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| 98 | |
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| 99 | if ($this->query_result) |
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| 100 | { |
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| 101 | if (defined('PUN_SHOW_QUERIES')) |
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| 102 | $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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| 103 | |
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| 104 | ++$this->num_queries; |
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| 105 | |
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| 106 | return $this->query_result; |
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| 107 | } |
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| 108 | else |
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| 109 | { |
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| 110 | if (defined('PUN_SHOW_QUERIES')) |
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| 111 | $this->saved_queries[] = array($sql, 0); |
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| 112 | |
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| 113 | $this->error_no = @sqlite_last_error($this->link_id); |
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| 114 | $this->error_msg = @sqlite_error_string($this->error_no); |
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| 115 | |
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| 116 | if ($this->in_transaction) |
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| 117 | @sqlite_query($this->link_id, 'ROLLBACK'); |
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| 118 | |
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| 119 | --$this->in_transaction; |
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| 120 | |
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| 121 | return false; |
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| 122 | } |
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| 123 | } |
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| 124 | |
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| 125 | |
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| 126 | function result($query_id = 0, $row = 0, $col = 0) |
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| 127 | { |
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| 128 | if ($query_id) |
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| 129 | { |
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| 130 | if ($row !== 0 && @sqlite_seek($query_id, $row) === false) |
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| 131 | return false; |
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| 132 | |
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| 133 | $cur_row = @sqlite_current($query_id); |
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| 134 | if ($cur_row === false) |
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| 135 | return false; |
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| 136 | |
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| 137 | return $cur_row[$col]; |
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| 138 | } |
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| 139 | else |
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| 140 | return false; |
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| 141 | } |
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| 142 | |
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| 143 | |
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| 144 | function fetch_assoc($query_id = 0) |
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| 145 | { |
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| 146 | if ($query_id) |
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| 147 | { |
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| 148 | $cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC); |
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| 149 | if ($cur_row) |
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| 150 | { |
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| 151 | // Horrible hack to get rid of table names and table aliases from the array keys |
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| 152 | foreach ($cur_row as $key => $value) |
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| 153 | { |
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| 154 | $dot_spot = strpos($key, '.'); |
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| 155 | if ($dot_spot !== false) |
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| 156 | { |
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| 157 | unset($cur_row[$key]); |
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| 158 | $key = substr($key, $dot_spot+1); |
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| 159 | $cur_row[$key] = $value; |
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| 160 | } |
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| 161 | } |
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| 162 | } |
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| 163 | |
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| 164 | return $cur_row; |
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| 165 | } |
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| 166 | else |
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| 167 | return false; |
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| 168 | } |
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| 169 | |
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| 170 | |
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| 171 | function fetch_row($query_id = 0) |
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| 172 | { |
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| 173 | return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false; |
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| 174 | } |
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| 175 | |
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| 176 | |
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| 177 | function num_rows($query_id = 0) |
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| 178 | { |
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| 179 | return ($query_id) ? @sqlite_num_rows($query_id) : false; |
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| 180 | } |
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| 181 | |
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| 182 | |
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| 183 | function affected_rows() |
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| 184 | { |
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| 185 | return ($this->link_id) ? @sqlite_changes($this->link_id) : false; |
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| 186 | } |
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| 187 | |
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| 188 | |
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| 189 | function insert_id() |
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| 190 | { |
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| 191 | return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false; |
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| 192 | } |
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| 193 | |
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| 194 | |
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| 195 | function get_num_queries() |
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| 196 | { |
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| 197 | return $this->num_queries; |
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| 198 | } |
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| 199 | |
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| 200 | |
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| 201 | function get_saved_queries() |
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| 202 | { |
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| 203 | return $this->saved_queries; |
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| 204 | } |
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| 205 | |
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| 206 | |
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| 207 | function free_result($query_id = false) |
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| 208 | { |
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| 209 | return true; |
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| 210 | } |
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| 211 | |
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| 212 | |
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| 213 | function escape($str) |
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| 214 | { |
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| 215 | return is_array($str) ? '' : sqlite_escape_string($str); |
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| 216 | } |
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| 217 | |
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| 218 | |
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| 219 | function error() |
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| 220 | { |
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| 221 | $result['error_sql'] = @current(@end($this->saved_queries)); |
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| 222 | $result['error_no'] = $this->error_no; |
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| 223 | $result['error_msg'] = $this->error_msg; |
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| 224 | |
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| 225 | return $result; |
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| 226 | } |
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| 227 | |
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| 228 | |
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| 229 | function close() |
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| 230 | { |
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| 231 | if ($this->link_id) |
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| 232 | { |
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| 233 | if ($this->in_transaction) |
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| 234 | { |
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| 235 | if (defined('PUN_SHOW_QUERIES')) |
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| 236 | $this->saved_queries[] = array('COMMIT', 0); |
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| 237 | |
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| 238 | @sqlite_query($this->link_id, 'COMMIT'); |
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| 239 | } |
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| 240 | |
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| 241 | return @sqlite_close($this->link_id); |
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| 242 | } |
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| 243 | else |
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| 244 | return false; |
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| 245 | } |
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| 246 | |
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| 247 | |
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| 248 | function get_names() |
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| 249 | { |
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| 250 | return ''; |
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| 251 | } |
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| 252 | |
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| 253 | |
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| 254 | function set_names($names) |
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| 255 | { |
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| 256 | return true; |
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| 257 | } |
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| 258 | |
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| 259 | |
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| 260 | function get_version() |
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| 261 | { |
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| 262 | return array( |
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| 263 | 'name' => 'SQLite', |
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| 264 | 'version' => sqlite_libversion() |
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| 265 | ); |
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| 266 | } |
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| 267 | |
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| 268 | |
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| 269 | function table_exists($table_name, $no_prefix = false) |
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| 270 | { |
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| 271 | $result = $this->query('SELECT 1 FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\''); |
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| 272 | return $this->num_rows($result) > 0; |
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| 273 | } |
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| 274 | |
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| 275 | |
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| 276 | function field_exists($table_name, $field_name, $no_prefix = false) |
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| 277 | { |
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| 278 | $result = $this->query('SELECT sql FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\''); |
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| 279 | if (!$this->num_rows($result)) |
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| 280 | return false; |
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| 281 | |
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| 282 | return preg_match('%[\r\n]'.preg_quote($field_name, '%').' %', $this->result($result)); |
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| 283 | } |
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| 284 | |
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| 285 | |
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| 286 | function index_exists($table_name, $index_name, $no_prefix = false) |
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| 287 | { |
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| 288 | $result = $this->query('SELECT 1 FROM sqlite_master WHERE tbl_name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_'.$this->escape($index_name).'\' AND type=\'index\''); |
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| 289 | return $this->num_rows($result) > 0; |
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| 290 | } |
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| 291 | |
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| 292 | |
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| 293 | function create_table($table_name, $schema, $no_prefix = false) |
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| 294 | { |
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| 295 | if ($this->table_exists($table_name, $no_prefix)) |
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| 296 | return true; |
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| 297 | |
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| 298 | $query = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name." (\n"; |
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| 299 | |
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| 300 | // Go through every schema element and add it to the query |
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| 301 | foreach ($schema['FIELDS'] as $field_name => $field_data) |
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| 302 | { |
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| 303 | $field_data['datatype'] = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_data['datatype']); |
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| 304 | |
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| 305 | $query .= $field_name.' '.$field_data['datatype']; |
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| 306 | |
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| 307 | if (!$field_data['allow_null']) |
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| 308 | $query .= ' NOT NULL'; |
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| 309 | |
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| 310 | if (isset($field_data['default'])) |
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| 311 | $query .= ' DEFAULT '.$field_data['default']; |
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| 312 | |
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| 313 | $query .= ",\n"; |
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| 314 | } |
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| 315 | |
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| 316 | // If we have a primary key, add it |
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| 317 | if (isset($schema['PRIMARY KEY'])) |
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| 318 | $query .= 'PRIMARY KEY ('.implode(',', $schema['PRIMARY KEY']).'),'."\n"; |
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| 319 | |
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| 320 | // Add unique keys |
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| 321 | if (isset($schema['UNIQUE KEYS'])) |
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| 322 | { |
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| 323 | foreach ($schema['UNIQUE KEYS'] as $key_name => $key_fields) |
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| 324 | $query .= 'UNIQUE ('.implode(',', $key_fields).'),'."\n"; |
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| 325 | } |
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| 326 | |
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| 327 | // We remove the last two characters (a newline and a comma) and add on the ending |
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| 328 | $query = substr($query, 0, strlen($query) - 2)."\n".')'; |
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| 329 | |
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| 330 | $result = $this->query($query) ? true : false; |
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| 331 | |
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| 332 | // Add indexes |
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| 333 | if (isset($schema['INDEXES'])) |
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| 334 | { |
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| 335 | foreach ($schema['INDEXES'] as $index_name => $index_fields) |
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| 336 | $result &= $this->add_index($table_name, $index_name, $index_fields, false, $no_prefix); |
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| 337 | } |
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| 338 | |
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| 339 | return $result; |
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| 340 | } |
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| 341 | |
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| 342 | |
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| 343 | function drop_table($table_name, $no_prefix = false) |
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| 344 | { |
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| 345 | if (!$this->table_exists($table_name, $no_prefix)) |
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| 346 | return true; |
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| 347 | |
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| 348 | return $this->query('DROP TABLE '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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| 349 | } |
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| 350 | |
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| 351 | |
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| 352 | function rename_table($old_name, $new_name, $no_prefix = false) |
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| 353 | { |
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| 354 | // If there new table exists and the old one doesn't, then we're happy |
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| 355 | if ($this->table_exists($new_table, $no_prefix) && !$this->table_exists($old_table, $no_prefix)) |
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| 356 | return true; |
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| 357 | |
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| 358 | $table = $this->get_table_info($old_name, $no_prefix); |
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| 359 | |
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| 360 | // Create new table |
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| 361 | $newtable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($old_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($new_name).' (', $table['sql']); |
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| 362 | $result = $this->query($newtable) ? true : false; |
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| 363 | |
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| 364 | // Recreate indexes |
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| 365 | if (!empty($table['indices'])) |
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| 366 | { |
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| 367 | foreach ($table['indices'] as $cur_index) |
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| 368 | $result &= $this->query($cur_index) ? true : false; |
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| 369 | } |
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| 370 | |
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| 371 | // Copy content across |
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| 372 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($new_name).' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($old_name)) ? true : false; |
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| 373 | |
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| 374 | // Drop old table |
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| 375 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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| 376 | |
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| 377 | return $result; |
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| 378 | } |
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| 379 | |
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| 380 | |
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| 381 | function get_table_info($table_name, $no_prefix = false) |
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| 382 | { |
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| 383 | // Grab table info |
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| 384 | $result = $this->query('SELECT sql FROM sqlite_master WHERE tbl_name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' ORDER BY type DESC') or error('Unable to fetch table information', __FILE__, __LINE__, $this->error()); |
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| 385 | $num_rows = $this->num_rows($result); |
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| 386 | |
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| 387 | if ($num_rows == 0) |
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| 388 | return; |
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| 389 | |
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| 390 | $table = array(); |
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| 391 | $table['indices'] = array(); |
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| 392 | while ($cur_index = $this->fetch_assoc($result)) |
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| 393 | { |
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| 394 | if (empty($cur_index['sql'])) |
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| 395 | continue; |
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| 396 | |
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| 397 | if (!isset($table['sql'])) |
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| 398 | $table['sql'] = $cur_index['sql']; |
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| 399 | else |
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| 400 | $table['indices'][] = $cur_index['sql']; |
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| 401 | } |
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| 402 | |
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| 403 | // Work out the columns in the table currently |
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| 404 | $table_lines = explode("\n", $table['sql']); |
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| 405 | $table['columns'] = array(); |
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| 406 | foreach ($table_lines as $table_line) |
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| 407 | { |
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| 408 | $table_line = trim($table_line, " \t\n\r,"); // trim spaces, tabs, newlines, and commas |
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| 409 | if (substr($table_line, 0, 12) == 'CREATE TABLE') |
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| 410 | continue; |
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| 411 | else if (substr($table_line, 0, 11) == 'PRIMARY KEY') |
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| 412 | $table['primary_key'] = $table_line; |
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| 413 | else if (substr($table_line, 0, 6) == 'UNIQUE') |
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| 414 | $table['unique'] = $table_line; |
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| 415 | else if (substr($table_line, 0, strpos($table_line, ' ')) != '') |
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| 416 | $table['columns'][substr($table_line, 0, strpos($table_line, ' '))] = trim(substr($table_line, strpos($table_line, ' '))); |
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| 417 | } |
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| 418 | |
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| 419 | return $table; |
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| 420 | } |
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| 421 | |
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| 422 | |
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| 423 | function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = 0, $no_prefix = false) |
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| 424 | { |
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| 425 | if ($this->field_exists($table_name, $field_name, $no_prefix)) |
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| 426 | return true; |
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| 427 | |
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| 428 | $table = $this->get_table_info($table_name, $no_prefix); |
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| 429 | |
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| 430 | // Create temp table |
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| 431 | $now = time(); |
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| 432 | $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']); |
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| 433 | $result = $this->query($tmptable) ? true : false; |
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| 434 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false; |
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| 435 | |
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| 436 | // Create new table sql |
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| 437 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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| 438 | $query = $field_type; |
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| 439 | if (!$allow_null) |
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| 440 | $query .= ' NOT NULL'; |
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| 441 | if ($default_value === null || $default_value === '') |
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| 442 | $default_value = '\'\''; |
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| 443 | |
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| 444 | $query .= ' DEFAULT '.$default_value; |
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| 445 | |
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| 446 | $old_columns = array_keys($table['columns']); |
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| 447 | array_insert($table['columns'], $after_field, $query, $field_name); |
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| 448 | |
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| 449 | $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('; |
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| 450 | |
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| 451 | foreach ($table['columns'] as $cur_column => $column_details) |
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| 452 | $new_table .= "\n".$cur_column.' '.$column_details.','; |
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| 453 | |
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| 454 | if (isset($table['unique'])) |
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| 455 | $new_table .= "\n".$table['unique'].','; |
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| 456 | |
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| 457 | if (isset($table['primary_key'])) |
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| 458 | $new_table .= "\n".$table['primary_key'].','; |
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| 459 | |
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| 460 | $new_table = trim($new_table, ',')."\n".');'; |
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| 461 | |
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| 462 | // Drop old table |
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| 463 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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| 464 | |
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| 465 | // Create new table |
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| 466 | $result &= $this->query($new_table) ? true : false; |
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| 467 | |
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| 468 | // Recreate indexes |
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| 469 | if (!empty($table['indices'])) |
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| 470 | { |
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| 471 | foreach ($table['indices'] as $cur_index) |
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| 472 | $result &= $this->query($cur_index) ? true : false; |
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| 473 | } |
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| 474 | |
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| 475 | // Copy content back |
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| 476 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('.implode(', ', $old_columns).') SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now) ? true : false; |
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| 477 | |
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| 478 | // Drop temp table |
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| 479 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now); |
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| 480 | |
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| 481 | return $result; |
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| 482 | } |
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| 483 | |
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| 484 | |
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| 485 | function alter_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = 0, $no_prefix = false) |
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| 486 | { |
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| 487 | // Unneeded for SQLite |
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| 488 | return true; |
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| 489 | } |
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| 490 | |
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| 491 | |
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| 492 | function drop_field($table_name, $field_name, $no_prefix = false) |
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| 493 | { |
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| 494 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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| 495 | return true; |
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| 496 | |
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| 497 | $table = $this->get_table_info($table_name, $no_prefix); |
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| 498 | |
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| 499 | // Create temp table |
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| 500 | $now = time(); |
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| 501 | $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']); |
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| 502 | $result = $this->query($tmptable) ? true : false; |
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| 503 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false; |
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| 504 | |
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| 505 | // Work out the columns we need to keep and the sql for the new table |
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| 506 | unset($table['columns'][$field_name]); |
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| 507 | $new_columns = array_keys($table['columns']); |
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| 508 | |
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| 509 | $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('; |
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| 510 | |
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| 511 | foreach ($table['columns'] as $cur_column => $column_details) |
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| 512 | $new_table .= "\n".$cur_column.' '.$column_details.','; |
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| 513 | |
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| 514 | if (isset($table['unique'])) |
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| 515 | $new_table .= "\n".$table['unique'].','; |
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| 516 | |
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| 517 | if (isset($table['primary_key'])) |
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| 518 | $new_table .= "\n".$table['primary_key'].','; |
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| 519 | |
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| 520 | $new_table = trim($new_table, ',')."\n".');'; |
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| 521 | |
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| 522 | // Drop old table |
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| 523 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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| 524 | |
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| 525 | // Create new table |
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| 526 | $result &= $this->query($new_table) ? true : false; |
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| 527 | |
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| 528 | // Recreate indexes |
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| 529 | if (!empty($table['indices'])) |
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| 530 | { |
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| 531 | foreach ($table['indices'] as $cur_index) |
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| 532 | if (!preg_match('%\('.preg_quote($field_name, '%').'\)%', $cur_index)) |
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| 533 | $result &= $this->query($cur_index) ? true : false; |
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| 534 | } |
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| 535 | |
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| 536 | // Copy content back |
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| 537 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' SELECT '.implode(', ', $new_columns).' FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now) ? true : false; |
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| 538 | |
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| 539 | // Drop temp table |
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| 540 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now); |
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| 541 | |
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| 542 | return $result; |
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| 543 | } |
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| 544 | |
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| 545 | |
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| 546 | function add_index($table_name, $index_name, $index_fields, $unique = false, $no_prefix = false) |
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| 547 | { |
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| 548 | if ($this->index_exists($table_name, $index_name, $no_prefix)) |
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| 549 | return true; |
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| 550 | |
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| 551 | return $this->query('CREATE '.($unique ? 'UNIQUE ' : '').'INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.' ON '.($no_prefix ? '' : $this->prefix).$table_name.'('.implode(',', $index_fields).')') ? true : false; |
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| 552 | } |
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| 553 | |
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| 554 | |
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| 555 | function drop_index($table_name, $index_name, $no_prefix = false) |
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| 556 | { |
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| 557 | if (!$this->index_exists($table_name, $index_name, $no_prefix)) |
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| 558 | return true; |
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| 559 | |
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| 560 | return $this->query('DROP INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name) ? true : false; |
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| 561 | } |
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| 562 | |
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| 563 | function truncate_table($table_name, $no_prefix = false) |
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| 564 | { |
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| 565 | return $this->query('DELETE FROM '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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| 566 | } |
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| 567 | } |
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