137 lines
3.3 KiB
PHP
137 lines
3.3 KiB
PHP
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<?php
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class DB
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{
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public static $dsn = 'mysql:dbname=table;host=localhost';
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public static $user = 'user';
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public static $pass = 'password';
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/**
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* Объект PDO.
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*/
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public static $dbh = null;
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/**
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* Statement Handle.
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*/
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public static $sth = null;
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/**
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* Выполняемый SQL запрос.
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*/
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public static $query = '';
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/**
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* Подключение к БД.
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*/
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public static function getDbh()
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{
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if (!self::$dbh) {
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try {
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self::$dbh = new PDO(
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self::$dsn,
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self::$user,
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self::$pass,
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array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'")
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);
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self::$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
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} catch (PDOException $e) {
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exit('Error connecting to database: ' . $e->getMessage());
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}
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}
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return self::$dbh;
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}
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/**
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* Закрытие соединения.
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*/
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public static function destroy()
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{
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self::$dbh = null;
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return self::$dbh;
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}
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/**
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* Получение ошибки запроса.
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*/
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public static function getError()
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{
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$info = self::$sth->errorInfo();
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return (isset($info[2])) ? 'SQL: ' . $info[2] : null;
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}
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/**
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* Возвращает структуру таблицы в виде ассоциативного массива.
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*/
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public static function getStructure($table)
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{
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$res = array();
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foreach (self::getAll("SHOW COLUMNS FROM {$table}") as $row) {
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$res[$row['Field']] = (is_null($row['Default'])) ? '' : $row['Default'];
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}
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return $res;
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}
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/**
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* Добавление в таблицу, в случаи успеха вернет вставленный ID, иначе 0.
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*/
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public static function add($query, $param = array())
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{
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self::$sth = self::getDbh()->prepare($query);
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return (self::$sth->execute((array) $param)) ? self::getDbh()->lastInsertId() : 0;
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}
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/**
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* Выполнение запроса.
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*/
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public static function set($query, $param = array())
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{
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self::$sth = self::getDbh()->prepare($query);
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return self::$sth->execute((array) $param);
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}
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/**
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* Получение строки из таблицы.
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*/
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public static function getRow($query, $param = array())
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{
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self::$sth = self::getDbh()->prepare($query);
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self::$sth->execute((array) $param);
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return self::$sth->fetch(PDO::FETCH_ASSOC);
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}
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/**
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* Получение всех строк из таблицы.
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*/
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public static function getAll($query, $param = array())
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{
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self::$sth = self::getDbh()->prepare($query);
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self::$sth->execute((array) $param);
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return self::$sth->fetchAll(PDO::FETCH_ASSOC);
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}
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/**
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* Получение значения.
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*/
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public static function getValue($query, $param = array(), $default = null)
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{
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$result = self::getRow($query, $param);
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if (!empty($result)) {
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$result = array_shift($result);
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}
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return (empty($result)) ? $default : $result;
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}
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/**
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* Получение столбца таблицы.
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*/
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public static function getColumn($query, $param = array())
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{
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self::$sth = self::getDbh()->prepare($query);
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self::$sth->execute((array) $param);
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return self::$sth->fetchAll(PDO::FETCH_COLUMN);
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}
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}
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?>
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