[693] | 1 | <?php |
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| 2 | /* |
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| 3 | * The Strangecode Codebase - a general application development framework for PHP |
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| 4 | * For details visit the project site: <http://trac.strangecode.com/> |
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| 5 | * Copyright © 2019 Strangecode, LLC |
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| 6 | * |
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| 7 | * This program is free software: you can redistribute it and/or modify |
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| 8 | * it under the terms of the GNU General Public License as published by |
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| 9 | * the Free Software Foundation, either version 3 of the License, or |
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| 10 | * (at your option) any later version. |
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| 11 | * |
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| 12 | * This program is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | * GNU General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU General Public License |
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| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | */ |
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| 20 | |
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| 21 | /* |
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| 22 | * PDO.inc.php |
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| 23 | * |
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| 24 | * |
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| 25 | * |
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| 26 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 27 | * @version 1.0 |
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| 28 | * @since 09 Jul 2019 08:11:03 |
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| 29 | * |
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| 30 | * Example of use: |
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| 31 | --------------------------------------------------------------------- |
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| 32 | $x = new PDO(); |
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| 33 | $x->setParam(array('foo' => 'bar')); |
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| 34 | $x->doIt(); |
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| 35 | echo $x->getIt(); |
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| 36 | --------------------------------------------------------------------- |
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| 37 | */ |
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| 38 | namespace Strangecode\Codebase; |
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| 39 | use \App; |
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| 40 | |
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| 41 | class PDO |
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| 42 | { |
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| 43 | // A place to keep an object instance for the singleton pattern. |
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| 44 | protected static $instance = null; |
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| 45 | |
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| 46 | // If $db->connect has successfully opened a db connection. |
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| 47 | protected $_connected = false; |
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| 48 | |
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| 49 | // Database handle. |
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| 50 | public $dbh; |
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| 51 | |
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| 52 | // Count how many queries run during the whole instance. |
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| 53 | protected $_query_count = 0; |
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| 54 | |
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| 55 | // Hash of DB parameters. |
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| 56 | protected $_params = array( |
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| 57 | |
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| 58 | // DB passwords should be set as apache environment variables in httpd.conf, readable only by root. |
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| 59 | 'db_server' => 'localhost', |
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| 60 | 'db_name' => null, |
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| 61 | 'db_user' => null, |
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| 62 | 'db_pass' => null, |
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| 63 | |
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| 64 | // Display all SQL queries. FALSE recommended for production sites. |
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| 65 | 'db_always_debug' => false, |
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| 66 | |
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| 67 | // Display db errors. FALSE recommended for production sites. |
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| 68 | 'db_debug' => false, |
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| 69 | |
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| 70 | // Script stops on db error. TRUE recommended for production sites. |
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| 71 | 'db_die_on_failure' => true, |
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| 72 | |
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| 73 | // Special date settings. These will dynamically changes depending on MySQL version or settings. |
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| 74 | 'zero_date' => '0000-00-00', |
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| 75 | 'infinity_date' => '9999-12-31', |
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| 76 | |
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| 77 | // Timezone for MySQL. |
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| 78 | 'timezone' => 'UTC', |
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| 79 | |
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| 80 | // MySQL character set and collation. |
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| 81 | 'character_set' => '', |
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| 82 | 'collation' => '', |
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[733] | 83 | |
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| 84 | // Reconnection attempt limit. Set to 0 to disable retries, i.e., only the first connect will be attempted. |
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| 85 | 'retry_limit' => 8, |
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[693] | 86 | ); |
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| 87 | |
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| 88 | // Translate between HTML and MySQL character set names. |
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| 89 | public $mysql_character_sets = array( |
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[747] | 90 | 'utf-8' => 'utf8mb4', |
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[693] | 91 | 'iso-8859-1' => 'latin1', |
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| 92 | ); |
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| 93 | |
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| 94 | // Caches. |
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| 95 | protected static $existing_tables = null; |
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| 96 | protected static $table_columns = []; |
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| 97 | |
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| 98 | /** |
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| 99 | * PDO constructor. |
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| 100 | * |
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| 101 | * @access public |
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| 102 | * @param string $namespace Namespace for this object, used to avoid collisions in global contexts. |
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| 103 | * @param string $params Configuration parameters for this object. |
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| 104 | */ |
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[810] | 105 | public function __construct(Array $params=[]) |
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[693] | 106 | { |
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| 107 | // Set custom parameters. |
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| 108 | $this->setParam($params); |
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| 109 | } |
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| 110 | |
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| 111 | /** |
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| 112 | * This method enforces the singleton pattern for this class. |
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| 113 | * |
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| 114 | * @return object Reference to the global DB object. |
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| 115 | * @access public |
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| 116 | * @static |
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| 117 | */ |
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| 118 | public static function &getInstance() |
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| 119 | { |
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| 120 | if (self::$instance === null) { |
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| 121 | self::$instance = new self(); |
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| 122 | } |
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| 123 | |
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| 124 | return self::$instance; |
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| 125 | } |
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| 126 | |
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| 127 | /** |
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| 128 | * Set the params of this object. |
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| 129 | * |
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| 130 | * @access public |
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| 131 | * @param array $params Array of param keys and values to set. |
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| 132 | */ |
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[810] | 133 | public function setParam(Array $params) |
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[693] | 134 | { |
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[810] | 135 | if (!isset($params) || !is_array($params)) { |
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| 136 | trigger_error(sprintf('%s failed; not an array: %s', __METHOD__, getDump($params, false, SC_DUMP_PRINT_R)), E_USER_ERROR); |
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[693] | 137 | } |
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[810] | 138 | |
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| 139 | // Merge new parameters with old overriding only those passed. |
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| 140 | $this->_params = array_merge($this->_params, $params); |
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| 141 | |
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| 142 | if ($this->isConnected()) { |
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| 143 | // Params that require additional processing if set during runtime. |
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| 144 | foreach ($params as $key => $val) { |
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| 145 | switch ($key) { |
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| 146 | case 'timezone': |
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| 147 | // Set timezone used by MySQL. |
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| 148 | $this->query(sprintf("SET time_zone = %s;", $this->quote($val))); |
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| 149 | break; |
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| 150 | } |
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| 151 | } |
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| 152 | } |
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[693] | 153 | } |
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| 154 | |
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| 155 | /** |
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| 156 | * Return the value of a parameter, if it exists. |
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| 157 | * |
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| 158 | * @access public |
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| 159 | * @param string $param Which parameter to return. |
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| 160 | * @return mixed Configured parameter value. |
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| 161 | */ |
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| 162 | public function getParam($param) |
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| 163 | { |
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| 164 | $app =& App::getInstance(); |
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| 165 | |
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| 166 | if (isset($this->_params[$param])) { |
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| 167 | return $this->_params[$param]; |
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| 168 | } else { |
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| 169 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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| 170 | return null; |
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| 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | /* |
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| 175 | * Connect to database with credentials in params. |
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| 176 | * |
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| 177 | * @access public |
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| 178 | * @param |
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| 179 | * @return |
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| 180 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 181 | * @since 09 Jul 2019 08:16:42 |
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| 182 | */ |
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[733] | 183 | public function connect($retry_num=0) |
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[693] | 184 | { |
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| 185 | $app =& App::getInstance(); |
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| 186 | |
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| 187 | if (!$this->getParam('db_name') || !$this->getParam('db_user') || !$this->getParam('db_pass')) { |
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| 188 | $app->logMsg('Database credentials missing.', LOG_EMERG, __FILE__, __LINE__); |
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| 189 | return false; |
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| 190 | } |
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| 191 | |
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| 192 | // If db_server not specified, assume localhost. |
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[733] | 193 | if (null === $this->_params['db_server']) { |
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[693] | 194 | $this->setParam(array('db_server' => 'localhost')); |
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| 195 | } |
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| 196 | |
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| 197 | // If the mysql charset is not defined, try to determine a mysql charset from the app charset. |
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| 198 | if ('' == $this->getParam('character_set') && '' != $app->getParam('character_set') && isset($this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])) { |
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| 199 | $this->setParam(array('character_set' => $this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])); |
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| 200 | } |
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| 201 | |
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| 202 | try { |
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[729] | 203 | // Set charset in DSN and disable emulated prepares as per https://stackoverflow.com/questions/134099/are-pdo-prepared-statements-sufficient-to-prevent-sql-injection/12202218 |
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[693] | 204 | $dsn = sprintf('mysql:host=%s;dbname=%s;charset=%s', $this->getParam('db_server'), $this->getParam('db_name'), $this->getParam('character_set')); |
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| 205 | $options = [ |
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| 206 | \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, |
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| 207 | \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC, |
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| 208 | \PDO::ATTR_EMULATE_PREPARES => false, |
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| 209 | ]; |
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| 210 | $this->dbh = new \PDO($dsn, $this->getParam('db_user'), $this->getParam('db_pass'), $options); |
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| 211 | } catch (\PDOException $e) { |
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[733] | 212 | $mysql_error_msg = sprintf('PDO connect %s: %s (db_server=%s, db_name=%s, db_user=%s, db_pass=%s)%s', |
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[698] | 213 | get_class($e), |
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| 214 | $e->getMessage(), |
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| 215 | $this->getParam('db_server'), |
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| 216 | $this->getParam('db_name'), |
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| 217 | $this->getParam('db_user'), |
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[733] | 218 | ('' == $this->getParam('db_pass') ? 'NO' : 'YES'), |
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| 219 | ($retry_num > 0 ? ' retry ' . $retry_num : '') |
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[698] | 220 | ); |
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[733] | 221 | // Use LOG_NOTICE for first connection attempts, and LOG_EMERG for the last one. |
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| 222 | $app->logMsg($mysql_error_msg, ($retry_num >= $this->getParam('retry_limit') ? LOG_EMERG : LOG_NOTICE), __FILE__, __LINE__); |
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[693] | 223 | |
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[733] | 224 | // These are probably transient errors: |
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| 225 | // SQLSTATE[HY000] [2002] Connection refused |
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| 226 | // SQLSTATE[HY000] [2002] No such file or directory |
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| 227 | // SQLSTATE[HY000] [2006] MySQL server has gone away |
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| 228 | if ($retry_num < $this->getParam('retry_limit') && (strpos($e->getMessage(), '[2002]') !== false || strpos($e->getMessage(), '[2006]') !== false)) { |
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| 229 | // Try again after a delay: |
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| 230 | usleep(500000); |
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| 231 | return $this->connect(++$retry_num); |
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| 232 | } |
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| 233 | |
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[693] | 234 | // Print helpful or pretty error? |
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[698] | 235 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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| 236 | if (!$app->isCLI()) { |
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[733] | 237 | printf('<pre style="padding:1em;background:#ddd;font:10px monospace;">%s</pre>', $mysql_error_msg); |
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[698] | 238 | } |
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[693] | 239 | } |
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| 240 | |
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| 241 | // Die if db_die_on_failure = true, or just continue without connection. |
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| 242 | return $this->_fail(); |
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| 243 | } |
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| 244 | |
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| 245 | // DB connection success! |
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| 246 | $this->_connected = true; |
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| 247 | |
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| 248 | // Update config for this version of MySQL. |
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| 249 | if (version_compare($this->dbh->getAttribute(\PDO::ATTR_SERVER_VERSION), '5.7.4', '>=')) { |
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| 250 | $this->setParam(array('zero_date' => '1000-01-01')); |
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| 251 | } |
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| 252 | |
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| 253 | // Set MySQL session timezone. |
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| 254 | if ($this->getParam('timezone')) { |
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| 255 | // https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html |
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| 256 | $this->dbh->query(sprintf("SET time_zone = '%s'", $this->getParam('timezone'))); |
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| 257 | } |
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| 258 | |
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| 259 | return true; |
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| 260 | } |
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| 261 | |
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| 262 | /** |
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| 263 | * Close db connection. |
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| 264 | * |
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| 265 | * @access public |
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| 266 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 267 | * @since 28 Aug 2005 14:32:01 |
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| 268 | */ |
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| 269 | public function close() |
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| 270 | { |
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| 271 | $this->_connected = false; |
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| 272 | $this->dbh = null; |
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[719] | 273 | |
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[693] | 274 | return true; |
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| 275 | } |
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| 276 | |
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| 277 | /* |
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| 278 | * |
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| 279 | * |
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| 280 | * @access public |
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| 281 | * @param |
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| 282 | * @return |
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| 283 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 284 | * @version 1.0 |
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| 285 | * @since 03 Jul 2013 14:50:23 |
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| 286 | */ |
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| 287 | public function reconnect() |
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| 288 | { |
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| 289 | $this->close(); |
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| 290 | $this->connect(); |
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| 291 | } |
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| 292 | |
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| 293 | /* |
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| 294 | * |
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| 295 | * |
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| 296 | * @access public |
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| 297 | * @param |
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| 298 | * @return |
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| 299 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 300 | * @since 09 Jul 2019 10:05:34 |
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| 301 | */ |
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| 302 | public function ping() |
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| 303 | { |
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[698] | 304 | $app =& App::getInstance(); |
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| 305 | |
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[693] | 306 | if (!$this->_connected) { |
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[719] | 307 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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[693] | 308 | } |
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| 309 | |
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| 310 | try { |
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| 311 | $this->dbh->query('SELECT 1'); |
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| 312 | } catch (\PDOException $e) { |
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| 313 | return false; |
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| 314 | } |
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| 315 | |
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| 316 | return true; |
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| 317 | } |
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| 318 | |
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| 319 | /* |
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| 320 | * Die only if db_die_on_failure is true. This will be set to false for some cases |
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| 321 | * when a database is not required for web app functionality. |
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| 322 | * |
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| 323 | * @access public |
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| 324 | * @param string $msg Print $msg when dying. |
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| 325 | * @return bool false If we don't die. |
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| 326 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 327 | * @version 1.0 |
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| 328 | * @since 15 Jan 2007 15:59:00 |
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| 329 | */ |
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| 330 | protected function _fail() |
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| 331 | { |
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| 332 | $app =& App::getInstance(); |
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| 333 | |
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| 334 | if ($this->getParam('db_die_on_failure')) { |
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| 335 | if (!$app->isCLI()) { |
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| 336 | // For http requests, send a Service Unavailable header. |
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| 337 | header(' ', true, 503); |
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| 338 | echo _("This page is temporarily unavailable. Please try again in a few minutes."); |
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| 339 | } |
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| 340 | die; |
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| 341 | } else { |
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| 342 | return false; |
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| 343 | } |
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| 344 | } |
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| 345 | |
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| 346 | /** |
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| 347 | * Returns connection status |
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| 348 | * |
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| 349 | * @access public |
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| 350 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 351 | * @since 28 Aug 2005 14:58:09 |
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| 352 | */ |
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| 353 | public function isConnected() |
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| 354 | { |
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| 355 | return (true === $this->_connected); |
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| 356 | } |
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| 357 | |
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| 358 | /* |
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| 359 | * Return the total number of queries executed thus far. |
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| 360 | * |
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| 361 | * @access public |
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| 362 | * @return int Number of queries |
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| 363 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 364 | * @version 1.0 |
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| 365 | * @since 15 Jun 2006 11:46:05 |
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| 366 | */ |
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| 367 | public function numQueries() |
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| 368 | { |
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| 369 | return $this->_query_count; |
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| 370 | } |
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| 371 | |
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| 372 | /** |
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| 373 | * Reset cached items. |
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| 374 | * |
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| 375 | * @access public |
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| 376 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 377 | * @since 28 Aug 2005 22:10:50 |
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| 378 | */ |
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| 379 | public function resetCache() |
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| 380 | { |
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| 381 | self::$existing_tables = null; |
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| 382 | self::$table_columns = []; |
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| 383 | } |
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| 384 | |
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| 385 | /* |
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| 386 | * |
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| 387 | * |
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| 388 | * @access public |
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| 389 | * @param string $query The SQL query to execute |
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| 390 | * @param bool $debug If true, prints debugging info |
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| 391 | * @return resource PDOStatement |
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| 392 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 393 | * @since 09 Jul 2019 10:00:00 |
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| 394 | */ |
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| 395 | public function query($query, $debug=false) |
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| 396 | { |
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| 397 | $app =& App::getInstance(); |
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| 398 | |
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| 399 | if (!$this->_connected) { |
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[719] | 400 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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[693] | 401 | } |
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| 402 | |
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| 403 | $this->_query_count++; |
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| 404 | |
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[724] | 405 | $debugqry = preg_replace('/\n[\t ]+/' . $app->getParam('preg_u'), "\n", $query); |
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[693] | 406 | if ($this->getParam('db_always_debug') || $debug) { |
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| 407 | if ($debug > 1) { |
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| 408 | dump($debugqry, true, SC_DUMP_PRINT_R, __FILE__, __LINE__); |
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| 409 | } else { |
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[698] | 410 | echo "<!-- ----------------- PDO query $this->_query_count ---------------------\n$debugqry\n-->\n"; |
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[693] | 411 | } |
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| 412 | } |
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| 413 | |
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| 414 | // Ensure we have an active connection. |
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| 415 | // If we continue on a dead connection we might experience a "MySQL server has gone away" error. |
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| 416 | // http://dev.mysql.com/doc/refman/5.0/en/gone-away.html |
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| 417 | if (!$this->ping()) { |
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| 418 | $app->logMsg(sprintf('MySQL ping failed; reconnecting⊠("%s")', truncate(trim($debugqry), 150)), LOG_DEBUG, __FILE__, __LINE__); |
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| 419 | $this->reconnect(); |
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| 420 | } |
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| 421 | |
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| 422 | // Execute! |
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| 423 | try { |
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| 424 | $stmt = $this->dbh->query($query); |
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[698] | 425 | if (!$stmt) { |
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[718] | 426 | throw new \Exception('PDO::query returned false'); |
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[698] | 427 | } |
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| 428 | } catch (\Exception $e) { |
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| 429 | $app->logMsg(sprintf('PDO query %s (%s): %s in query: %s', get_class($e), $e->getCode(), $e->getMessage(), $debugqry), LOG_EMERG, __FILE__, __LINE__); |
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| 430 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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[693] | 431 | if (!$app->isCLI()) { |
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[698] | 432 | printf('<pre style="padding:1em;background:#ddd;font:0.9rem monospace;">%s<hr>%s</pre>', wordwrap($e->getMessage()), htmlspecialchars($debugqry)); |
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[693] | 433 | } |
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| 434 | } |
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| 435 | // Die if db_die_on_failure = true, or just continue without connection |
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| 436 | return $this->_fail(); |
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| 437 | } |
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| 438 | |
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| 439 | return $stmt; |
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| 440 | } |
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| 441 | |
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| 442 | /* |
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| 443 | * |
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| 444 | * |
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| 445 | * @access public |
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| 446 | * @param |
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| 447 | * @return |
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| 448 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 449 | * @since 09 Jul 2019 19:26:37 |
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| 450 | */ |
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| 451 | public function prepare($query, ...$params) |
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| 452 | { |
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| 453 | $app =& App::getInstance(); |
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| 454 | |
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| 455 | if (!$this->_connected) { |
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[719] | 456 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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[693] | 457 | } |
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| 458 | |
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| 459 | $this->_query_count++; |
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| 460 | |
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[724] | 461 | $debugqry = preg_replace('/\n[\t ]+/' . $app->getParam('preg_u'), "\n", $query); |
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[693] | 462 | if ($this->getParam('db_always_debug')) { |
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[698] | 463 | echo "<!-- ----------------- PDO prepare $this->_query_count ---------------------\n$debugqry\n-->\n"; |
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[693] | 464 | } |
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| 465 | |
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| 466 | // Ensure we have an active connection. |
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| 467 | // If we continue on a dead connection we might experience a "MySQL server has gone away" error. |
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| 468 | // http://dev.mysql.com/doc/refman/5.0/en/gone-away.html |
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| 469 | if (!$this->ping()) { |
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| 470 | $app->logMsg(sprintf('MySQL ping failed; reconnecting⊠("%s")', truncate(trim($debugqry), 150)), LOG_DEBUG, __FILE__, __LINE__); |
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| 471 | $this->reconnect(); |
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| 472 | } |
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| 473 | |
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| 474 | // Execute! |
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| 475 | try { |
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| 476 | $stmt = $this->dbh->prepare($query, ...$params); |
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[698] | 477 | if (!$stmt) { |
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[718] | 478 | throw new \Exception('PDO::prepare returned false'); |
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[698] | 479 | } |
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[693] | 480 | } catch (\PDOException $e) { |
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[698] | 481 | $app->logMsg(sprintf('PDO prepare %s (%s): %s in query: %s', get_class($e), $e->getCode(), $e->getMessage(), $debugqry), LOG_EMERG, __FILE__, __LINE__); |
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| 482 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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[693] | 483 | if (!$app->isCLI()) { |
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[698] | 484 | printf('<pre style="padding:1em;background:#ddd;font:0.9rem monospace;">%s<hr>%s</pre>', wordwrap($e->getMessage()), htmlspecialchars($debugqry)); |
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[693] | 485 | } |
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| 486 | } |
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| 487 | // Die if db_die_on_failure = true, or just continue without connection |
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| 488 | return $this->_fail(); |
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| 489 | } |
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| 490 | |
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| 491 | return $stmt; |
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| 492 | } |
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| 493 | |
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| 494 | /* |
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| 495 | * |
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| 496 | * |
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| 497 | * @access public |
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| 498 | * @param |
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| 499 | * @return |
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| 500 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 501 | * @since 09 Jul 2019 19:42:48 |
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| 502 | */ |
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| 503 | public function lastInsertId($name=null) |
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| 504 | { |
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| 505 | return $this->dbh->lastInsertId($name); |
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| 506 | } |
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| 507 | |
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| 508 | /* |
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| 509 | * |
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| 510 | * |
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| 511 | * @access public |
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| 512 | * @param |
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| 513 | * @return |
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| 514 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 515 | * @since 09 Jul 2019 18:32:55 |
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| 516 | */ |
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| 517 | public function quote(...$params) |
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| 518 | { |
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| 519 | return $this->dbh->quote(...$params); |
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| 520 | } |
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| 521 | |
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| 522 | /* |
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[718] | 523 | * Remove unsafe characters from SQL identifiers (tables, views, indexes, columns, and constraints). |
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[693] | 524 | * |
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| 525 | * @access public |
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[718] | 526 | * @param string $idname Identifier name. |
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| 527 | * @return string Clean string. |
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[693] | 528 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 529 | * @since 09 Jul 2019 18:32:55 |
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| 530 | */ |
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[718] | 531 | static function sanitizeIdentifier($idname) |
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[693] | 532 | { |
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[724] | 533 | $app =& App::getInstance(); |
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| 534 | |
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| 535 | return preg_replace('/\W/' . $app->getParam('preg_u'), '', $idname); |
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[693] | 536 | } |
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| 537 | |
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| 538 | /** |
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| 539 | * Loads a list of tables in the current database into an array, and returns |
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| 540 | * true if the requested table is found. Use this function to enable/disable |
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| 541 | * functionality based upon the current available db tables or to dynamically |
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| 542 | * create tables if missing. |
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| 543 | * |
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| 544 | * @param string $table The name of the table to search. |
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| 545 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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| 546 | * @return bool true if given $table exists. |
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| 547 | */ |
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| 548 | public function tableExists($table, $use_cached_results=true) |
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| 549 | { |
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| 550 | $app =& App::getInstance(); |
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| 551 | |
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| 552 | if (!$this->_connected) { |
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[719] | 553 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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[693] | 554 | } |
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| 555 | |
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| 556 | if (null === self::$existing_tables || !$use_cached_results) { |
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| 557 | $stmt = $this->query('SHOW TABLES'); |
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| 558 | self::$existing_tables = $stmt->fetchAll(\PDO::FETCH_COLUMN); |
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| 559 | } |
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| 560 | |
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| 561 | if (in_array($table, self::$existing_tables)) { |
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| 562 | return true; |
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| 563 | } else { |
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| 564 | $app->logMsg(sprintf('Nonexistent DB table: %s.%s', $this->getParam('db_name'), $table), LOG_INFO, __FILE__, __LINE__); |
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| 565 | return false; |
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| 566 | } |
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| 567 | } |
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| 568 | |
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| 569 | /** |
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| 570 | * Tests if the given array of columns exists in the specified table. |
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| 571 | * |
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| 572 | * @param string $table The name of the table to search. |
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| 573 | * @param array $columns An array of column names. |
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| 574 | * @param bool $strict Exact schema match. If TRUE, test if *only* the given columns exist. If FALSE, test if given columns exist (possibly amongst others). |
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| 575 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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| 576 | * @return bool true if column(s) exist. |
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| 577 | */ |
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| 578 | public function columnExists($table, $columns, $strict=true, $use_cached_results=true) |
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| 579 | { |
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| 580 | $app =& App::getInstance(); |
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| 581 | |
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| 582 | if (!$this->_connected) { |
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[719] | 583 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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[693] | 584 | } |
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| 585 | |
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| 586 | // Ensure the table exists. |
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| 587 | if (!$this->tableExists($table, $use_cached_results)) { |
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| 588 | $app->logMsg(sprintf('Table does not exist: %s', $table), LOG_NOTICE, __FILE__, __LINE__); |
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| 589 | return false; |
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| 590 | } |
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| 591 | |
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| 592 | // For single-value columns. |
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| 593 | if (!is_array($columns)) { |
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| 594 | $columns = array($columns); |
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| 595 | } |
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| 596 | |
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| 597 | if (!isset(self::$table_columns[$table]) || !$use_cached_results) { |
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| 598 | // Populate and cache array of current columns for this table. |
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| 599 | $stmt = $this->query(sprintf('DESCRIBE `%s`', $this->sanitizeIdentifier($table))); |
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| 600 | self::$table_columns[$table] = $stmt->fetchAll(\PDO::FETCH_COLUMN); |
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| 601 | } |
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| 602 | |
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| 603 | if ($strict) { |
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| 604 | // Do an exact comparison of table schemas. |
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| 605 | sort($columns); |
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| 606 | sort(self::$table_columns[$table]); |
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| 607 | return self::$table_columns[$table] == $columns; |
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| 608 | } else { |
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| 609 | // Only check that the specified columns are available in the table. |
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| 610 | $match_columns = array_intersect(self::$table_columns[$table], $columns); |
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| 611 | sort($columns); |
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| 612 | sort($match_columns); |
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| 613 | return $match_columns == $columns; |
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| 614 | } |
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| 615 | } |
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| 616 | |
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| 617 | /** |
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| 618 | * Returns the values of an ENUM or SET column, returning them as an array. |
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| 619 | * |
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| 620 | * @param string $db_table database table to lookup |
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| 621 | * @param string $db_col database column to lookup |
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| 622 | * @param bool $sort Sort the output. |
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| 623 | * @return array Array of the set/enum values on success, false on failure. |
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| 624 | */ |
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| 625 | public function getEnumValues($db_table, $db_col, $sort=false) |
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| 626 | { |
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| 627 | $app =& App::getInstance(); |
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| 628 | |
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| 629 | $stmt = $this->query(sprintf("SHOW COLUMNS FROM `%s` LIKE %s", $this->sanitizeIdentifier($db_table), $this->dbh->quote($db_col)), false); |
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| 630 | $row = $stmt->fetch(\PDO::FETCH_ASSOC); |
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| 631 | if (isset($row['Type']) && preg_match('/^(?:enum|set)\((.*)\)$/i', $row['Type'], $matches) && isset($matches[1]) && '' != $matches[1]) { |
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| 632 | $enum = str_getcsv($matches[1], ",", "'"); |
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| 633 | if ($sort) { |
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| 634 | natsort($enum); |
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| 635 | } |
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| 636 | return $enum; |
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| 637 | } else { |
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| 638 | $app->logMsg(sprintf('No set or enum fields found in %s.%s', $db_table, $db_col), LOG_ERR, __FILE__, __LINE__); |
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| 639 | return false; |
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| 640 | } |
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| 641 | } |
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| 642 | } |
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