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| 1 | <?php |
| 2 | |
| 3 | namespace BuyerKiosk\Core; |
| 4 | |
| 5 | /* |
| 6 | * PDO Database class |
| 7 | * |
| 8 | * Usage: |
| 9 | * $db = Database::getInstance(); |
| 10 | * Return array of query results, normal statement: $results = $db->query("SELECT * FROM test WHERE name = 'Bob'"); |
| 11 | * Return array of query results, prepared statement (named params): $results = $db->query("SELECT * FROM test WHERE name = :name", array(":name" => "matthew")); |
| 12 | * Return int of last insert result row id: $db->lastInsertId() |
| 13 | * Return int of last query result row count: $db->lastQueryRowCount() |
| 14 | * |
| 15 | * @package BuyerKiosk\Core |
| 16 | */ |
| 17 | class Database { |
| 18 | |
| 19 | /* |
| 20 | * Instance of the database class |
| 21 | * |
| 22 | * @static Database $instance |
| 23 | */ |
| 24 | private static $instance; |
| 25 | /* |
| 26 | * Database connection |
| 27 | * |
| 28 | * @access private |
| 29 | * @var \PDO $connection |
| 30 | */ |
| 31 | private $connection; |
| 32 | |
| 33 | /* |
| 34 | * Constructor |
| 35 | * |
| 36 | * @param $dsn The Data Source Name. eg, "mysql:dbname=testdb;host=127.0.0.1;port=3306" |
| 37 | * @param $username |
| 38 | * @param $password |
| 39 | */ |
| 40 | public function __construct($dbName = null) { |
| 41 | if(!isset($dbName)) { |
| 42 | global $db_name; |
| 43 | $dbName = $db_name; |
| 44 | } |
| 45 | global $db_user,$db_pass; |
| 46 | $this->connection = new \PDO('mysql:host=localhost;dbname='.$dbName.';charset=utf8', $db_user, $db_pass, array( |
| 47 | \PDO::ATTR_PERSISTENT => true, |
| 48 | \PDO::ATTR_TIMEOUT => "30")); |
| 49 | if (empty($this->connection)) { |
| 50 | trigger_error("Error #D001:", E_USER_ERROR); |
| 51 | return false; |
| 52 | } |
| 53 | $this->connection->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Gets an instance of the Database class |
| 58 | * |
| 59 | * @static $instance |
| 60 | * @return Database An instance of the database singleton class |
| 61 | */ |
| 62 | public static function getInstance() { |
| 63 | if (empty(self::$instance)) { |
| 64 | try { |
| 65 | self::$instance = new Database(); |
| 66 | } catch (\PDOException $e) { |
| 67 | trigger_error("Error #D002: ".$e->getMessage(), E_USER_ERROR); |
| 68 | } |
| 69 | } |
| 70 | return self::$instance; |
| 71 | } |
| 72 | |
| 73 | /* |
| 74 | * Runs a query using the current connection to the database |
| 75 | * |
| 76 | * @param string query |
| 77 | * @param array $args An array of arguments for the sanitization such as array(":name" => "foo") |
| 78 | * @return array Containing all the remaining rows in the result set. |
| 79 | */ |
| 80 | public function query($query, $args = false) { |
| 81 | $tokens = array_map('trim',explode(" ",trim($query))); |
| 82 | $query = str_replace(array("\r\n", "\r", "\t"), " ", $query); |
| 83 | $query = str_replace(' ', ' ', $query); |
| 84 | try { |
| 85 | // Prepare results |
| 86 | $results=false; |
| 87 | |
| 88 | // Allow for rollback if query fails |
| 89 | $this->connection->beginTransaction(); |
| 90 | |
| 91 | // Prepared statements |
| 92 | $sth = $this->connection->prepare($query); |
| 93 | // Execute prepared statement, with or without arguments |
| 94 | if (empty($args)) { |
| 95 | $sth->execute(); |
| 96 | } else { |
| 97 | $multiple = false; |
| 98 | foreach ($args as $arg) { |
| 99 | if (!is_array($arg)) { continue; } |
| 100 | $multiple = true; |
| 101 | break; |
| 102 | } |
| 103 | if ($multiple) { |
| 104 | $i=0;$j=count($args); |
| 105 | foreach ($args as $arg) { |
| 106 | foreach ($arg as $k=>$v) { |
| 107 | if ($v === "NULL") { $arg[$k] = null; } |
| 108 | } |
| 109 | $sth->execute($arg); |
| 110 | $i++; |
| 111 | } |
| 112 | } else { |
| 113 | $i=0;$j=count($args); |
| 114 | foreach ($args as $a=>$arg) { |
| 115 | if ($arg === "NULL") {$args[$a] = null;} |
| 116 | $i++; |
| 117 | } |
| 118 | $sth->execute($args); |
| 119 | } |
| 120 | } |
| 121 | // SELECT: Return array of data or false if 0 rows |
| 122 | if ($tokens[0] == "SELECT") { |
| 123 | $sth->setFetchMode(\PDO::FETCH_ASSOC); |
| 124 | $results = $sth->fetchAll(); |
| 125 | } |
| 126 | // INSERT/UPDATE/REPLACE: Return number of affected rows / array of affected ids ? |
| 127 | // Note: lastInsertId only works if ID col on table is auto_incremented |
| 128 | elseif ($tokens[0] == "INSERT" |
| 129 | || $tokens[0] == "UPDATE" |
| 130 | || $tokens[0] == "REPLACE") { |
| 131 | |
| 132 | // If sessions table, assume key = return id |
| 133 | $results = $this->connection->lastInsertId(); |
| 134 | } |
| 135 | // Else: Return number of affected rows |
| 136 | else { |
| 137 | $results = $sth->rowCount(); |
| 138 | } |
| 139 | // Attempt to commit changes, triggers exception if fails |
| 140 | $this->connection->commit(); |
| 141 | // Rollback changes on failure |
| 142 | } catch (\PDOException $e) { |
| 143 | $msg = 'query(): ***** Caught Exception! Rolling back changes *****'.PHP_EOL.'<hr />Query:<pre>'.$query.'</pre>'.PHP_EOL.'<hr />Exception Message:<pre>'.$e->getMessage().'</pre><hr />'.PHP_EOL; |
| 144 | $this->connection->rollBack(); |
| 145 | trigger_error($msg, E_USER_ERROR); |
| 146 | return false; |
| 147 | } |
| 148 | return $results; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Returns the last insert result row id |
| 153 | * |
| 154 | * @return int of last insert result row id |
| 155 | */ |
| 156 | public function lastInsertId() { |
| 157 | return $this->connection->lastInsertId(); |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * Returns the last query result row count |
| 162 | * |
| 163 | * @return int of last query result row count |
| 164 | */ |
| 165 | public function lastQueryRowCount() { |
| 166 | return $this->connection->lastQueryRowCount(); |
| 167 | } |
| 168 | |
| 169 | } |