[1] | 1 | <?php |
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| 2 | /** |
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[362] | 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/codebase/> |
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[396] | 5 | * Copyright 2001-2012 Strangecode, LLC |
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[465] | 6 | * |
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[362] | 7 | * This file is part of The Strangecode Codebase. |
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| 8 | * |
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| 9 | * The Strangecode Codebase is free software: you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU General Public License as published by the |
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| 11 | * Free Software Foundation, either version 3 of the License, or (at your option) |
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| 12 | * any later version. |
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[465] | 13 | * |
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[362] | 14 | * The Strangecode Codebase is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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| 17 | * details. |
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[465] | 18 | * |
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[362] | 19 | * You should have received a copy of the GNU General Public License along with |
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| 20 | * The Strangecode Codebase. If not, see <http://www.gnu.org/licenses/>. |
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| 21 | */ |
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| 22 | |
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| 23 | /** |
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[1] | 24 | * DB.inc.php |
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| 25 | * |
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[136] | 26 | * Very lightweight DB semi-abstraction layer. Mainly to catch errors with mysql_query, with some goodies. |
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[1] | 27 | * |
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| 28 | * @author Quinn Comendant <quinn@strangecode.com> |
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[136] | 29 | * @version 2.1 |
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[1] | 30 | */ |
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[42] | 31 | |
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[502] | 32 | class DB |
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| 33 | { |
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[1] | 34 | |
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[468] | 35 | // A place to keep an object instance for the singleton pattern. |
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[484] | 36 | protected static $instance = null; |
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[468] | 37 | |
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[136] | 38 | // If $db->connect has successfully opened a db connection. |
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[484] | 39 | protected $_connected = false; |
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[1] | 40 | |
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[136] | 41 | // Database handle. |
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[468] | 42 | public $dbh; |
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[465] | 43 | |
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[172] | 44 | // Count how many queries run during the whole instance. |
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[484] | 45 | protected $_query_count = 0; |
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[1] | 46 | |
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| 47 | // Hash of DB parameters. |
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[484] | 48 | protected $_params = array(); |
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[1] | 49 | |
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| 50 | // Default parameters. |
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[484] | 51 | protected $_param_defaults = array( |
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[1] | 52 | |
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| 53 | // DB passwords should be set as apache environment variables in httpd.conf, readable only by root. |
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| 54 | 'db_server' => 'localhost', |
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| 55 | 'db_name' => null, |
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| 56 | 'db_user' => null, |
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| 57 | 'db_pass' => null, |
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| 58 | |
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[231] | 59 | // Display all SQL queries. FALSE recommended for production sites. |
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[136] | 60 | 'db_always_debug' => false, |
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| 61 | |
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[231] | 62 | // Display db errors. FALSE recommended for production sites. |
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[136] | 63 | 'db_debug' => false, |
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[465] | 64 | |
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[231] | 65 | // Script stops on db error. TRUE recommended for production sites. |
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| 66 | 'db_die_on_failure' => true, |
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[601] | 67 | |
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| 68 | // Special date settings. These will dynamically changes depending on MySQL version or settings. |
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| 69 | 'zero_date' => '0000-00-00', |
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| 70 | 'infinity_date' => '9999-12-31', |
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[660] | 71 | |
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| 72 | // Timezone for MySQL. |
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| 73 | 'timezone' => 'UTC', |
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[1] | 74 | ); |
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[42] | 75 | |
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[1] | 76 | // Translate between HTML and MySQL character set names. |
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[468] | 77 | public $mysql_character_sets = array( |
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[1] | 78 | 'utf-8' => 'utf8', |
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| 79 | 'iso-8859-1' => 'latin1', |
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| 80 | ); |
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[42] | 81 | |
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[1] | 82 | // Caches. |
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[630] | 83 | protected static $existing_tables = null; |
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| 84 | protected static $table_columns = null; |
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[42] | 85 | |
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[1] | 86 | /** |
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[601] | 87 | * Constructor. |
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| 88 | */ |
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| 89 | public function __construct() |
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| 90 | { |
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| 91 | // Initialize default parameters. |
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| 92 | $this->_params = array_merge($this->_params, $this->_param_defaults); |
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| 93 | } |
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| 94 | |
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| 95 | /** |
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[1] | 96 | * This method enforces the singleton pattern for this class. |
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| 97 | * |
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[136] | 98 | * @return object Reference to the global DB object. |
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[1] | 99 | * @access public |
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| 100 | * @static |
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| 101 | */ |
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[468] | 102 | public static function &getInstance() |
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[1] | 103 | { |
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[468] | 104 | if (self::$instance === null) { |
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| 105 | self::$instance = new self(); |
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[1] | 106 | } |
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| 107 | |
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[468] | 108 | return self::$instance; |
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[1] | 109 | } |
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[42] | 110 | |
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[1] | 111 | /** |
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| 112 | * Set (or overwrite existing) parameters by passing an array of new parameters. |
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| 113 | * |
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| 114 | * @access public |
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| 115 | * |
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| 116 | * @param array $params Array of parameters (key => val pairs). |
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| 117 | */ |
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[468] | 118 | public function setParam($params) |
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[1] | 119 | { |
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[479] | 120 | $app =& App::getInstance(); |
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[465] | 121 | |
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[1] | 122 | if (isset($params) && is_array($params)) { |
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| 123 | // Merge new parameters with old overriding only those passed. |
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[136] | 124 | $this->_params = array_merge($this->_params, $params); |
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[1] | 125 | } else { |
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[136] | 126 | $app->logMsg(sprintf('Parameters are not an array: %s', $params), LOG_ERR, __FILE__, __LINE__); |
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[1] | 127 | } |
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| 128 | } |
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| 129 | |
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| 130 | /** |
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[136] | 131 | * Return the value of a parameter, if it exists. |
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[1] | 132 | * |
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[136] | 133 | * @access public |
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| 134 | * @param string $param Which parameter to return. |
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| 135 | * @return mixed Configured parameter value. |
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[1] | 136 | */ |
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[468] | 137 | public function getParam($param) |
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[1] | 138 | { |
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[479] | 139 | $app =& App::getInstance(); |
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[465] | 140 | |
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[478] | 141 | if (array_key_exists($param, $this->_params)) { |
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[136] | 142 | return $this->_params[$param]; |
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[1] | 143 | } else { |
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[146] | 144 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 145 | return null; |
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| 146 | } |
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| 147 | } |
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[42] | 148 | |
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[1] | 149 | /** |
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| 150 | * Connect to database with credentials in params. |
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| 151 | * |
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| 152 | * @access public |
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| 153 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 154 | * @since 28 Aug 2005 14:02:49 |
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| 155 | */ |
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[468] | 156 | public function connect() |
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[1] | 157 | { |
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[479] | 158 | $app =& App::getInstance(); |
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[465] | 159 | |
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[136] | 160 | if (!$this->getParam('db_name') || !$this->getParam('db_user') || !$this->getParam('db_pass')) { |
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| 161 | $app->logMsg('Database credentials missing.', LOG_EMERG, __FILE__, __LINE__); |
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[1] | 162 | return false; |
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| 163 | } |
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[42] | 164 | |
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[563] | 165 | if (!$this->getParam('db_server')) { |
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| 166 | // If db_server not specified, assume localhost. |
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[564] | 167 | $this->setParam(array('db_server' => 'localhost')); |
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[563] | 168 | } |
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| 169 | |
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[1] | 170 | // Connect to database. Always create a new link to the server. |
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[563] | 171 | // Connection errors are suppressed so we can do our own error management below. |
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[468] | 172 | if ($this->dbh = @mysql_connect($this->getParam('db_server'), $this->getParam('db_user'), $this->getParam('db_pass'), true)) { |
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[1] | 173 | // Select database |
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[136] | 174 | mysql_select_db($this->getParam('db_name'), $this->dbh); |
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[1] | 175 | } |
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[42] | 176 | |
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[15] | 177 | // Test for connection errors. |
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[136] | 178 | if (!$this->dbh || mysql_error($this->dbh)) { |
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[627] | 179 | $mysql_error_msg = $this->dbh ? 'Codebase MySQL error: (' . mysql_errno($this->dbh) . ') ' . mysql_error($this->dbh) : sprintf('Codebase MySQL error: Could not connect to server (db_server=%s, db_name=%s, db_user=%s, db_pass=%s)', $this->getParam('db_server'), $this->getParam('db_name'), $this->getParam('db_user'), ('' == $this->getParam('db_pass') ? 'NO' : 'YES')); |
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[136] | 180 | $app->logMsg($mysql_error_msg, LOG_EMERG, __FILE__, __LINE__); |
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[15] | 181 | |
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| 182 | // Print helpful or pretty error? |
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[136] | 183 | if ($this->getParam('db_debug')) { |
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[1] | 184 | echo $mysql_error_msg . "\n"; |
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| 185 | } |
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[15] | 186 | |
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[416] | 187 | // Die if db_die_on_failure = true, or just continue without connection. |
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[230] | 188 | return $this->_fail(); |
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[1] | 189 | } |
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[42] | 190 | |
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[1] | 191 | // DB connection success! |
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[136] | 192 | $this->_connected = true; |
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[1] | 193 | |
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[334] | 194 | // Tell MySQL what character set we're using. Available only on MySQL versions > 4.01.01. |
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[247] | 195 | if ('' != $app->getParam('character_set') && isset($this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])) { |
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[661] | 196 | $this->query(sprintf("SET NAMES '%s';", $this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])); |
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[209] | 197 | } else { |
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| 198 | $app->logMsg(sprintf('%s is not a known character_set.', $app->getParam('character_set')), LOG_ERR, __FILE__, __LINE__); |
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| 199 | } |
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[10] | 200 | |
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[601] | 201 | // Update config for this version of MySQL. |
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| 202 | if (version_compare(mysql_get_server_info(), '5.7.4', '>=')) { |
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| 203 | $this->setParam(array('zero_date' => '1000-01-01')); |
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| 204 | } |
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| 205 | |
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[660] | 206 | // Set MySQL session timezone. |
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| 207 | if ($this->getParam('timezone')) { |
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[658] | 208 | // https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html |
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[661] | 209 | $this->query(sprintf("SET time_zone = '%s';", $this->getParam('timezone'))); |
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[654] | 210 | } |
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| 211 | |
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[1] | 212 | return true; |
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| 213 | } |
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[42] | 214 | |
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[1] | 215 | /** |
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| 216 | * Close db connection. |
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| 217 | * |
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| 218 | * @access public |
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| 219 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 220 | * @since 28 Aug 2005 14:32:01 |
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| 221 | */ |
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[468] | 222 | public function close() |
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[1] | 223 | { |
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[136] | 224 | if (!$this->_connected) { |
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[1] | 225 | return false; |
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| 226 | } |
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[416] | 227 | $this->_connected = false; |
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[136] | 228 | return mysql_close($this->dbh); |
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[1] | 229 | } |
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[465] | 230 | |
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[230] | 231 | /* |
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[416] | 232 | * |
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[465] | 233 | * |
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[416] | 234 | * @access public |
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[465] | 235 | * @param |
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| 236 | * @return |
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[416] | 237 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 238 | * @version 1.0 |
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| 239 | * @since 03 Jul 2013 14:50:23 |
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| 240 | */ |
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[468] | 241 | public function reconnect() |
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[416] | 242 | { |
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| 243 | $this->close(); |
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| 244 | $this->connect(); |
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| 245 | } |
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[465] | 246 | |
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[416] | 247 | /* |
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[230] | 248 | * Die only if db_die_on_failure is true. This will be set to false for some cases |
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| 249 | * when a database is not required for web app functionality. |
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| 250 | * |
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| 251 | * @access public |
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| 252 | * @param string $msg Print $msg when dying. |
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| 253 | * @return bool false If we don't die. |
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| 254 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 255 | * @version 1.0 |
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| 256 | * @since 15 Jan 2007 15:59:00 |
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| 257 | */ |
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[484] | 258 | protected function _fail() |
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[230] | 259 | { |
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[547] | 260 | $app =& App::getInstance(); |
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| 261 | |
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[230] | 262 | if ($this->getParam('db_die_on_failure')) { |
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[665] | 263 | if (!$app->isCLI()) { |
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[484] | 264 | // For http requests, send a Service Unavailable header. |
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| 265 | header(' ', true, 503); |
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| 266 | echo _("This page is temporarily unavailable. Please try again in a few minutes."); |
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| 267 | } |
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[230] | 268 | die; |
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| 269 | } else { |
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| 270 | return false; |
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| 271 | } |
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| 272 | } |
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[42] | 273 | |
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[1] | 274 | /** |
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| 275 | * Return the current database handler. |
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| 276 | * |
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| 277 | * @access public |
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| 278 | * @return resource Current value of $this->dbh. |
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| 279 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 280 | * @since 20 Aug 2005 13:50:36 |
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| 281 | */ |
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[468] | 282 | public function getDBH() |
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[1] | 283 | { |
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[136] | 284 | if (!$this->_connected) { |
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[1] | 285 | return false; |
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| 286 | } |
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| 287 | |
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[136] | 288 | return $this->dbh; |
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[1] | 289 | } |
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[42] | 290 | |
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[1] | 291 | /** |
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| 292 | * Returns connection status |
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| 293 | * |
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| 294 | * @access public |
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| 295 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 296 | * @since 28 Aug 2005 14:58:09 |
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| 297 | */ |
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[468] | 298 | public function isConnected() |
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[1] | 299 | { |
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[136] | 300 | return (true === $this->_connected); |
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[1] | 301 | } |
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[465] | 302 | |
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[71] | 303 | /** |
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| 304 | * Returns a properly escaped string using mysql_real_escape_string() with the current connection's charset. |
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| 305 | * |
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| 306 | * @access public |
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| 307 | * @param string $string Input string to be sent as SQL query. |
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| 308 | * @return string Escaped string from mysql_real_escape_string() |
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| 309 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 310 | * @since 06 Mar 2006 16:41:32 |
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| 311 | */ |
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[468] | 312 | public function escapeString($string) |
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[71] | 313 | { |
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[136] | 314 | if (!$this->_connected) { |
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| 315 | return false; |
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[71] | 316 | } |
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[136] | 317 | |
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| 318 | return mysql_real_escape_string($string, $this->dbh); |
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[71] | 319 | } |
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[42] | 320 | |
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[1] | 321 | /** |
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| 322 | * A wrapper for mysql_query. Allows us to set the database link_identifier, |
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| 323 | * to trap errors and ease debugging. |
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| 324 | * |
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| 325 | * @param string $query The SQL query to execute |
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| 326 | * @param bool $debug If true, prints debugging info |
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| 327 | * @return resource Query identifier |
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| 328 | */ |
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[468] | 329 | public function query($query, $debug=false) |
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[465] | 330 | { |
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[136] | 331 | $app =& App::getInstance(); |
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[42] | 332 | |
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[136] | 333 | if (!$this->_connected) { |
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[1] | 334 | return false; |
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| 335 | } |
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| 336 | |
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[172] | 337 | $this->_query_count++; |
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| 338 | |
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[1] | 339 | $debugqry = preg_replace("/\n[\t ]+/", "\n", $query); |
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[136] | 340 | if ($this->getParam('db_always_debug') || $debug) { |
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[172] | 341 | echo "<!-- ----------------- Query $this->_query_count ---------------------\n$debugqry\n-->\n"; |
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[1] | 342 | } |
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[465] | 343 | |
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| 344 | // Ensure we have an active connection. |
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[419] | 345 | // If we continue on a dead connection we might experience a "MySQL server has gone away" error. |
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| 346 | // http://dev.mysql.com/doc/refman/5.0/en/gone-away.html |
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[416] | 347 | if (!mysql_ping($this->dbh)) { |
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[546] | 348 | $app->logMsg(sprintf('MySQL ping failed; reconnecting⊠("%s")', truncate(trim($debugqry), 150)), LOG_DEBUG, __FILE__, __LINE__); |
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[416] | 349 | $this->reconnect(); |
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| 350 | } |
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[42] | 351 | |
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[1] | 352 | // Execute! |
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[136] | 353 | $qid = mysql_query($query, $this->dbh); |
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[42] | 354 | |
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[1] | 355 | // Error checking. |
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[136] | 356 | if (!$qid || mysql_error($this->dbh)) { |
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[230] | 357 | $app->logMsg(sprintf('MySQL error %s: %s in query: %s', mysql_errno($this->dbh), mysql_error($this->dbh), $debugqry), LOG_EMERG, __FILE__, __LINE__); |
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[136] | 358 | if ($this->getParam('db_debug')) { |
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[665] | 359 | if (!$app->isCLI()) { |
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[484] | 360 | echo '<pre style="padding:2em; background:#ddd; font:9px monaco;">' . wordwrap(mysql_error($this->dbh)) . '<hr>' . htmlspecialchars($debugqry) . '</pre>'; |
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| 361 | } |
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[465] | 362 | } |
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[230] | 363 | // Die if db_die_on_failure = true, or just continue without connection |
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| 364 | return $this->_fail(); |
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[1] | 365 | } |
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[42] | 366 | |
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[1] | 367 | return $qid; |
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| 368 | } |
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| 369 | |
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| 370 | /** |
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[42] | 371 | * Loads a list of tables in the current database into an array, and returns |
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[1] | 372 | * true if the requested table is found. Use this function to enable/disable |
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[334] | 373 | * functionality based upon the current available db tables or to dynamically |
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[1] | 374 | * create tables if missing. |
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| 375 | * |
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[396] | 376 | * @param string $table The name of the table to search. |
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| 377 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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| 378 | * @return bool true if given $table exists. |
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[1] | 379 | */ |
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[468] | 380 | public function tableExists($table, $use_cached_results=true) |
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[42] | 381 | { |
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[479] | 382 | $app =& App::getInstance(); |
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[465] | 383 | |
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[136] | 384 | if (!$this->_connected) { |
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[1] | 385 | return false; |
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| 386 | } |
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| 387 | |
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[630] | 388 | if (is_null(self::$existing_tables) || !$use_cached_results) { |
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| 389 | self::$existing_tables = array(); |
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[136] | 390 | $qid = $this->query("SHOW TABLES"); |
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[1] | 391 | while (list($row) = mysql_fetch_row($qid)) { |
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[630] | 392 | self::$existing_tables[] = $row; |
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[1] | 393 | } |
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| 394 | } |
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[630] | 395 | |
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| 396 | if (in_array($table, self::$existing_tables)) { |
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[1] | 397 | return true; |
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| 398 | } else { |
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[484] | 399 | $app->logMsg(sprintf('Nonexistent DB table: %s.%s', $this->getParam('db_name'), $table), LOG_INFO, __FILE__, __LINE__); |
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[1] | 400 | return false; |
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| 401 | } |
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| 402 | } |
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[42] | 403 | |
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[1] | 404 | /** |
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| 405 | * Tests if the given array of columns exists in the specified table. |
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| 406 | * |
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[396] | 407 | * @param string $table The name of the table to search. |
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| 408 | * @param array $columns An array of column names. |
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[550] | 409 | * @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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[396] | 410 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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| 411 | * @return bool true if column(s) exist. |
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[1] | 412 | */ |
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[468] | 413 | public function columnExists($table, $columns, $strict=true, $use_cached_results=true) |
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[42] | 414 | { |
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[532] | 415 | $app =& App::getInstance(); |
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| 416 | |
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[136] | 417 | if (!$this->_connected) { |
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[532] | 418 | $app->logMsg(sprintf('No DB connection to run %s', __METHOD__), LOG_NOTICE, __FILE__, __LINE__); |
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[1] | 419 | return false; |
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| 420 | } |
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| 421 | |
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| 422 | // Ensure the table exists. |
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[136] | 423 | if (!$this->tableExists($table, $use_cached_results)) { |
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[575] | 424 | $app->logMsg(sprintf('Table does not exist: %s', $table), LOG_NOTICE, __FILE__, __LINE__); |
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[1] | 425 | return false; |
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| 426 | } |
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[42] | 427 | |
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[1] | 428 | // For single-value columns. |
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| 429 | if (!is_array($columns)) { |
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| 430 | $columns = array($columns); |
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| 431 | } |
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[42] | 432 | |
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[630] | 433 | if (!isset(self::$table_columns[$table]) || !$use_cached_results) { |
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[1] | 434 | // Populate and cache array of current columns for this table. |
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[630] | 435 | self::$table_columns[$table] = array(); |
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[136] | 436 | $qid = $this->query("DESCRIBE $table"); |
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[1] | 437 | while ($row = mysql_fetch_row($qid)) { |
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[630] | 438 | self::$table_columns[$table][] = $row[0]; |
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[1] | 439 | } |
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| 440 | } |
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[42] | 441 | |
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[1] | 442 | if ($strict) { |
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| 443 | // Do an exact comparison of table schemas. |
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| 444 | sort($columns); |
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[630] | 445 | sort(self::$table_columns[$table]); |
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| 446 | return self::$table_columns[$table] == $columns; |
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[1] | 447 | } else { |
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| 448 | // Only check that the specified columns are available in the table. |
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[630] | 449 | $match_columns = array_intersect(self::$table_columns[$table], $columns); |
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[1] | 450 | sort($columns); |
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| 451 | sort($match_columns); |
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| 452 | return $match_columns == $columns; |
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| 453 | } |
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| 454 | } |
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[465] | 455 | |
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[172] | 456 | /* |
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[396] | 457 | * Return the total number of queries executed thus far. |
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[172] | 458 | * |
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| 459 | * @access public |
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| 460 | * @return int Number of queries |
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| 461 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 462 | * @version 1.0 |
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| 463 | * @since 15 Jun 2006 11:46:05 |
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| 464 | */ |
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[468] | 465 | public function numQueries() |
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[172] | 466 | { |
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| 467 | return $this->_query_count; |
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| 468 | } |
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[42] | 469 | |
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[1] | 470 | /** |
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| 471 | * Reset cached items. |
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| 472 | * |
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| 473 | * @access public |
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| 474 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 475 | * @since 28 Aug 2005 22:10:50 |
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| 476 | */ |
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[468] | 477 | public function resetCache() |
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[1] | 478 | { |
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[630] | 479 | self::$existing_tables = null; |
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| 480 | self::$table_columns = null; |
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[1] | 481 | } |
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[42] | 482 | |
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[497] | 483 | /** |
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| 484 | * Returns the values of an ENUM or SET column, returning them as an array. |
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| 485 | * |
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| 486 | * @param string $db_table database table to lookup |
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| 487 | * @param string $db_col database column to lookup |
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| 488 | * @param bool $sort Sort the output. |
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| 489 | * @return array Array of the set/enum values on success, false on failure. |
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| 490 | */ |
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| 491 | public function getEnumValues($db_table, $db_col, $sort=false) |
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| 492 | { |
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| 493 | $app =& App::getInstance(); |
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| 494 | |
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| 495 | $qid = $this->query("SHOW COLUMNS FROM " . $this->escapeString($db_table) . " LIKE '" . $this->escapeString($db_col) . "'", false); |
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| 496 | |
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| 497 | $row = mysql_fetch_row($qid); |
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| 498 | if (preg_match('/^enum|^set/i', $row[1]) && preg_match_all("/'([^']*)'/", $row[1], $matches)) { |
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| 499 | if ($sort) { |
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| 500 | natsort($matches[1]); |
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| 501 | } |
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| 502 | return $matches[1]; |
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| 503 | } else { |
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| 504 | $app->logMsg(sprintf('No set or enum fields found in %s.%s', $db_table, $db_col), LOG_ERR, __FILE__, __LINE__); |
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| 505 | return false; |
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| 506 | } |
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| 507 | } |
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| 508 | |
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[1] | 509 | } // End. |
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| 510 | |
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