910 lines
19 KiB
PHP
910 lines
19 KiB
PHP
<?php
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/**
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* Akeeba Engine
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*
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* @package akeebaengine
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* @copyright Copyright (c)2006-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
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* @license GNU General Public License version 3, or later
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*/
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namespace Akeeba\Engine\Driver;
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defined('AKEEBAENGINE') || die();
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use Akeeba\Engine\Driver\Query\Base as QueryBase;
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use Akeeba\Engine\Driver\Query\Limitable;
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use Akeeba\Engine\Driver\Query\Preparable;
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use PDO;
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use PDOException;
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use PDOStatement;
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use RuntimeException;
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use SQLite3;
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/**
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* SQLite database driver supporting PDO based connections
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*
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* @see http://php.net/manual/en/ref.pdo-sqlite.php
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* @since 1.0
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*/
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class Sqlite extends Base
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{
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public static $dbtech = 'sqlite';
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/**
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* The name of the database driver.
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*
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* @var string
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* @since 1.0
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*/
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public $name = 'sqlite';
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/** @var PDOStatement The database connection cursor from the last query. */
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protected $cursor;
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/** @var array Contains the current query execution status */
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protected $executed = false;
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/**
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* The character(s) used to quote SQL statement names such as table names or field names,
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* etc. The child classes should define this as necessary. If a single character string the
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* same character is used for both sides of the quoted name, else the first character will be
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* used for the opening quote and the second for the closing quote.
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*
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* @var string
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* @since 1.0
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*/
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protected $nameQuote = '`';
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/** @var resource The prepared statement. */
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protected $prepared;
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/** @var bool Are we in the process of reconnecting to the database server? */
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private $isReconnecting = false;
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public function __construct(array $options)
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{
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$this->driverType = 'sqlite';
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parent::__construct($options);
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if (!is_object($this->connection))
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{
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$this->open();
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}
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}
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/**
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* Test to see if the PDO ODBC connector is available.
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*
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* @return boolean True on success, false otherwise.
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*
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* @since 1.0
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*/
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public static function isSupported()
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{
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return class_exists('\\PDO') && in_array('sqlite', PDO::getAvailableDrivers());
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}
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/**
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* Destructor.
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*
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* @since 1.0
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*/
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public function __destruct()
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{
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$this->freeResult();
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unset($this->connection);
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}
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public function close()
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{
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$return = false;
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if (is_object($this->cursor))
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{
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$this->cursor->closeCursor();
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}
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$this->connection = null;
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return $return;
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}
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/**
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* Determines if the connection to the server is active.
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*
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* @return boolean True if connected to the database engine.
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*/
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public function connected()
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{
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return !empty($this->connection);
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}
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/**
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* Disconnects the database.
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*
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* @return void
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*
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* @since 1.0
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*/
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public function disconnect()
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{
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$this->freeResult();
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unset($this->connection);
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}
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/**
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* Drops a table from the database.
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*
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* @param string $tableName The name of the database table to drop.
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* @param boolean $ifExists Optionally specify that the table must exist before it is dropped.
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*
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* @return Sqlite Returns this object to support chaining.
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*
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* @since 1.0
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*/
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public function dropTable($tableName, $ifExists = true)
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{
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$this->open();
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$query = $this->getQuery(true);
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$this->setQuery('DROP TABLE ' . ($ifExists ? 'IF EXISTS ' : '') . $query->quoteName($tableName));
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$this->execute();
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return $this;
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}
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/**
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* Method to escape a string for usage in an SQLite statement.
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*
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* Note: Using query objects with bound variables is preferable to the below.
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*
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* @param string $text The string to be escaped.
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* @param boolean $extra Unused optional parameter to provide extra escaping.
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*
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* @return string The escaped string.
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*
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* @since 1.0
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*/
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public function escape($text, $extra = false)
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{
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if (is_int($text) || is_float($text))
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{
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return $text;
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}
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if (is_null($text))
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{
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return 'NULL';
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}
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return SQLite3::escapeString($text);
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}
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public function fetchAssoc($cursor = null)
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{
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if (!empty($cursor) && $cursor instanceof PDOStatement)
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{
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return $cursor->fetch(PDO::FETCH_ASSOC);
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}
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if ($this->prepared instanceof PDOStatement)
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{
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return $this->prepared->fetch(PDO::FETCH_ASSOC);
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}
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}
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public function freeResult($cursor = null)
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{
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$this->executed = false;
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if ($cursor instanceof PDOStatement)
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{
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$cursor->closeCursor();
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$cursor = null;
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}
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if ($this->prepared instanceof PDOStatement)
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{
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$this->prepared->closeCursor();
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$this->prepared = null;
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}
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}
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public function getAffectedRows()
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{
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$this->open();
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if ($this->prepared instanceof PDOStatement)
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{
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return $this->prepared->rowCount();
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}
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else
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{
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return 0;
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}
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}
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/**
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* Method to get the database collation in use by sampling a text field of a table in the database.
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*
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* @return mixed The collation in use by the database or boolean false if not supported.
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*
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* @since 1.0
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*/
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public function getCollation()
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{
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return $this->charset;
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}
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public function getNumRows($cursor = null)
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{
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$this->open();
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if ($cursor instanceof PDOStatement)
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{
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return $cursor->rowCount();
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}
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elseif ($this->prepared instanceof PDOStatement)
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{
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return $this->prepared->rowCount();
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}
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else
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{
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return 0;
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}
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}
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/**
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* Retrieve a PDO database connection attribute
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* http://www.php.net/manual/en/pdo.getattribute.php
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*
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* Usage: $db->getOption(PDO::ATTR_CASE);
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*
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* @param mixed $key One of the PDO::ATTR_* Constants
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*
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* @return mixed
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*
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* @since 1.0
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*/
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public function getOption($key)
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{
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$this->open();
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return $this->connection->getAttribute($key);
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}
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/**
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* Get the current query object or a new Query object.
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* We have to override the parent method since it will always return a PDO query, while we have a
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* specialized class for SQLite
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*
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* @param boolean $new False to return the current query object, True to return a new Query object.
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*
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* @return QueryBase The current query object or a new object extending the Query class.
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*
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* @throws RuntimeException
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*/
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public function getQuery($new = false)
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{
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if ($new)
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{
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return new Query\Sqlite($this);
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}
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return $this->sql;
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}
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/**
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* Retrieves field information about a given table.
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*
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* @param string $table The name of the database table.
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* @param boolean $typeOnly True to only return field types.
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*
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* @return array An array of fields for the database table.
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*
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* @throws RuntimeException
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* @since 1.0
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*/
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public function getTableColumns($table, $typeOnly = true)
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{
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$this->open();
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$columns = [];
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$query = $this->getQuery(true);
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$fieldCasing = $this->getOption(PDO::ATTR_CASE);
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$this->setOption(PDO::ATTR_CASE, PDO::CASE_UPPER);
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$table = strtoupper($table);
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$query->setQuery('pragma table_info(' . $table . ')');
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$this->setQuery($query);
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$fields = $this->loadObjectList();
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if ($typeOnly)
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{
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foreach ($fields as $field)
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{
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$columns[$field->NAME] = $field->TYPE;
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}
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}
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else
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{
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foreach ($fields as $field)
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{
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// Do some dirty translation to MySQL output.
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$columns[$field->NAME] = (object) [
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'Field' => $field->NAME,
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'Type' => $field->TYPE,
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'Null' => ($field->NOTNULL == '1' ? 'NO' : 'YES'),
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'Default' => $field->DFLT_VALUE,
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'Key' => ($field->PK == '1' ? 'PRI' : ''),
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];
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}
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}
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$this->setOption(PDO::ATTR_CASE, $fieldCasing);
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return $columns;
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}
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/**
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* Shows the table CREATE statement that creates the given tables.
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*
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* Note: Doesn't appear to have support in SQLite
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*
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* @param mixed $tables A table name or a list of table names.
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*
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* @return array A list of the create SQL for the tables.
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*
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* @throws RuntimeException
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* @since 1.0
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*/
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public function getTableCreate($tables)
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{
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$this->open();
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// Sanitize input to an array and iterate over the list.
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$tables = (array) $tables;
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return $tables;
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}
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/**
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* Get the details list of keys for a table.
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*
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* @param string $table The name of the table.
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*
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* @return array An array of the column specification for the table.
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*
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* @throws RuntimeException
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* @since 1.0
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*/
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public function getTableKeys($table)
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{
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$this->open();
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$keys = [];
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$query = $this->getQuery(true);
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$fieldCasing = $this->getOption(PDO::ATTR_CASE);
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$this->setOption(PDO::ATTR_CASE, PDO::CASE_UPPER);
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$table = strtoupper($table);
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$query->setQuery('pragma table_info( ' . $table . ')');
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// $query->bind(':tableName', $table);
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$this->setQuery($query);
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$rows = $this->loadObjectList();
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foreach ($rows as $column)
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{
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if ($column->PK == 1)
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{
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$keys[$column->NAME] = $column;
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}
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}
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$this->setOption(PDO::ATTR_CASE, $fieldCasing);
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return $keys;
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}
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/**
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* Method to get an array of all tables in the database (schema).
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*
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* @return array An array of all the tables in the database.
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*
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* @throws RuntimeException
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* @since 1.0
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*/
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public function getTableList()
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{
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$this->open();
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/* @type Query\Sqlite $query */
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$query = $this->getQuery(true);
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$type = 'table';
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$query->select('name');
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$query->from('sqlite_master');
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$query->where('type = :type');
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$query->bind(':type', $type);
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$query->order('name');
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$this->setQuery($query);
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$tables = $this->loadColumn();
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return $tables;
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}
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/**
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* There's no point on return "a list of tables" inside a SQLite database: we are simple going to
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* copy the whole database file in the new location
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*
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* @param bool $abstract
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*
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* @return array
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*/
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public function getTables($abstract = true)
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{
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return [];
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}
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/**
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* Get the version of the database connector.
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*
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* @return string The database connector version.
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*
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* @since 1.0
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*/
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public function getVersion()
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{
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$this->open();
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$this->setQuery("SELECT sqlite_version()");
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return $this->loadResult();
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}
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public function insertid()
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{
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$this->open();
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// Error suppress this to prevent PDO warning us that the driver doesn't support this operation.
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return @$this->connection->lastInsertId();
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}
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/**
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* Locks a table in the database.
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*
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* @param string $table The name of the table to unlock.
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*
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* @return Sqlite Returns this object to support chaining.
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*
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* @throws RuntimeException
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* @since 1.0
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*/
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public function lockTable($table)
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{
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return $this;
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}
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public function open()
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{
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if ($this->connected())
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{
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return;
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}
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else
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{
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$this->close();
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}
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if (isset($this->options['version']) && $this->options['version'] == 2)
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{
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$format = 'sqlite2:#DBNAME#';
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}
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else
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{
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$format = 'sqlite:#DBNAME#';
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}
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$replace = ['#DBNAME#'];
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$with = [$this->options['database']];
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// Create the connection string:
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$connectionString = str_replace($replace, $with, $format);
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try
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{
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$this->connection = new PDO(
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$connectionString,
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$this->options['user'],
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$this->options['password']
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);
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}
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catch (PDOException $e)
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{
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throw new RuntimeException('Could not connect to PDO' . ': ' . $e->getMessage(), 2, $e);
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}
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}
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public function query()
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{
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$this->open();
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if (!is_object($this->connection))
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{
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throw new RuntimeException($this->errorMsg, $this->errorNum);
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}
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// Take a local copy so that we don't modify the original query and cause issues later
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$sql = $this->replacePrefix((string) $this->sql);
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if ($this->limit > 0 || $this->offset > 0)
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{
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$sql .= ' LIMIT ' . $this->limit;
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if ($this->offset > 0)
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{
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$sql .= ' OFFSET ' . $this->offset;
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}
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}
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// Increment the query counter.
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$this->count++;
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// If debugging is enabled then let's log the query.
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if ($this->debug)
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{
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// Add the query to the object queue.
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$this->log[] = $sql;
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}
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// Reset the error values.
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$this->errorNum = 0;
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$this->errorMsg = '';
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// Execute the query.
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$this->executed = false;
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if ($this->prepared instanceof PDOStatement)
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{
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// Bind the variables:
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if ($this->sql instanceof Preparable)
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{
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$bounded =& $this->sql->getBounded();
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foreach ($bounded as $key => $obj)
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{
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$this->prepared->bindParam($key, $obj->value, $obj->dataType, $obj->length, $obj->driverOptions);
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}
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}
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$this->executed = $this->prepared->execute();
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}
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// If an error occurred handle it.
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if (!$this->executed)
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{
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// Get the error number and message before we execute any more queries.
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$errorNum = (int) $this->connection->errorCode();
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$errorMsg = (string) 'SQL: ' . implode(", ", $this->connection->errorInfo());
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// Check if the server was disconnected.
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if (!$this->connected() && !$this->isReconnecting)
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{
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$this->isReconnecting = true;
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try
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{
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// Attempt to reconnect.
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$this->connection = null;
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$this->open();
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}
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catch (RuntimeException $e)
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// If connect fails, ignore that exception and throw the normal exception.
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{
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// Get the error number and message.
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$this->errorNum = (int) $this->connection->errorCode();
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$this->errorMsg = (string) 'SQL: ' . implode(", ", $this->connection->errorInfo());
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// Throw the normal query exception.
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throw new RuntimeException($this->errorMsg, $this->errorNum);
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}
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// Since we were able to reconnect, run the query again.
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$result = $this->query();
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$this->isReconnecting = false;
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return $result;
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}
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else
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|
// The server was not disconnected.
|
|
{
|
|
// Get the error number and message from before we tried to reconnect.
|
|
$this->errorNum = $errorNum;
|
|
$this->errorMsg = $errorMsg;
|
|
|
|
// Throw the normal query exception.
|
|
throw new RuntimeException($this->errorMsg, $this->errorNum);
|
|
}
|
|
}
|
|
|
|
return $this->prepared;
|
|
}
|
|
|
|
/**
|
|
* Renames a table in the database.
|
|
*
|
|
* @param string $oldTable The name of the table to be renamed
|
|
* @param string $newTable The new name for the table.
|
|
* @param string $backup Not used by Sqlite.
|
|
* @param string $prefix Not used by Sqlite.
|
|
*
|
|
* @return Sqlite Returns this object to support chaining.
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function renameTable($oldTable, $newTable, $backup = null, $prefix = null)
|
|
{
|
|
$this->setQuery('ALTER TABLE ' . $oldTable . ' RENAME TO ' . $newTable)->execute();
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Select a database for use.
|
|
*
|
|
* @param string $database The name of the database to select for use.
|
|
*
|
|
* @return boolean True if the database was successfully selected.
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function select($database)
|
|
{
|
|
$this->open();
|
|
|
|
$this->_database = $database;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Sets an attribute on the PDO database handle.
|
|
* http://www.php.net/manual/en/pdo.setattribute.php
|
|
*
|
|
* Usage: $db->setOption(PDO::ATTR_CASE, PDO::CASE_UPPER);
|
|
*
|
|
* @param integer $key One of the PDO::ATTR_* Constants
|
|
* @param mixed $value One of the associated PDO Constants
|
|
* related to the particular attribute
|
|
* key.
|
|
*
|
|
* @return boolean
|
|
*
|
|
* @since 1.0
|
|
*/
|
|
public function setOption($key, $value)
|
|
{
|
|
$this->open();
|
|
|
|
return $this->connection->setAttribute($key, $value);
|
|
}
|
|
|
|
/**
|
|
* Sets the SQL statement string for later execution.
|
|
*
|
|
* @param mixed $query The SQL statement to set either as a JDatabaseQuery object or a string.
|
|
* @param integer $offset The affected row offset to set.
|
|
* @param integer $limit The maximum affected rows to set.
|
|
* @param array $driverOptions The optional PDO driver options
|
|
*
|
|
* @return Base This object to support method chaining.
|
|
*
|
|
* @since 1.0
|
|
*/
|
|
public function setQuery($query, $offset = null, $limit = null, $driverOptions = [])
|
|
{
|
|
$this->open();
|
|
|
|
$this->freeResult();
|
|
|
|
if (is_string($query))
|
|
{
|
|
// Allows taking advantage of bound variables in a direct query:
|
|
$query = $this->getQuery(true)->setQuery($query);
|
|
}
|
|
|
|
if ($query instanceof Limitable && !is_null($offset) && !is_null($limit))
|
|
{
|
|
$query->setLimit($limit, $offset);
|
|
}
|
|
|
|
$sql = $this->replacePrefix((string) $query);
|
|
|
|
$this->prepared = $this->connection->prepare($sql, $driverOptions);
|
|
|
|
// Store reference to the DatabaseQuery instance:
|
|
parent::setQuery($query, $offset, $limit);
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Set the connection to use UTF-8 character encoding.
|
|
*
|
|
* Returns false automatically for the Oracle driver since
|
|
* you can only set the character set when the connection
|
|
* is created.
|
|
*
|
|
* @return boolean True on success.
|
|
*
|
|
* @since 1.0
|
|
*/
|
|
public function setUTF()
|
|
{
|
|
$this->open();
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Method to commit a transaction.
|
|
*
|
|
* @param boolean $toSavepoint If true, commit to the last savepoint.
|
|
*
|
|
* @return void
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function transactionCommit($toSavepoint = false)
|
|
{
|
|
$this->open();
|
|
|
|
if (!$toSavepoint || $this->transactionDepth <= 1)
|
|
{
|
|
$this->open();
|
|
|
|
if (!$toSavepoint || $this->transactionDepth == 1)
|
|
{
|
|
$this->connection->commit();
|
|
}
|
|
|
|
$this->transactionDepth--;
|
|
}
|
|
else
|
|
{
|
|
$this->transactionDepth--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Method to roll back a transaction.
|
|
*
|
|
* @param boolean $toSavepoint If true, rollback to the last savepoint.
|
|
*
|
|
* @return void
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function transactionRollback($toSavepoint = false)
|
|
{
|
|
$this->connected();
|
|
|
|
if (!$toSavepoint || $this->transactionDepth <= 1)
|
|
{
|
|
$this->open();
|
|
|
|
if (!$toSavepoint || $this->transactionDepth == 1)
|
|
{
|
|
$this->connection->rollBack();
|
|
}
|
|
|
|
$this->transactionDepth--;
|
|
}
|
|
else
|
|
{
|
|
$savepoint = 'SP_' . ($this->transactionDepth - 1);
|
|
$this->setQuery('ROLLBACK TO ' . $this->quoteName($savepoint));
|
|
|
|
if ($this->execute())
|
|
{
|
|
$this->transactionDepth--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Method to initialize a transaction.
|
|
*
|
|
* @param boolean $asSavepoint If true and a transaction is already active, a savepoint will be created.
|
|
*
|
|
* @return void
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function transactionStart($asSavepoint = false)
|
|
{
|
|
$this->connected();
|
|
|
|
if (!$asSavepoint || !$this->transactionDepth)
|
|
{
|
|
$this->open();
|
|
|
|
if (!$asSavepoint || !$this->transactionDepth)
|
|
{
|
|
$this->connection->beginTransaction();
|
|
}
|
|
|
|
$this->transactionDepth++;
|
|
}
|
|
else
|
|
{
|
|
$savepoint = 'SP_' . $this->transactionDepth;
|
|
$this->setQuery('SAVEPOINT ' . $this->quoteName($savepoint));
|
|
|
|
if ($this->execute())
|
|
{
|
|
$this->transactionDepth++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Unlocks tables in the database.
|
|
*
|
|
* @return Sqlite Returns this object to support chaining.
|
|
*
|
|
* @throws RuntimeException
|
|
* @since 1.0
|
|
*/
|
|
public function unlockTables()
|
|
{
|
|
return $this;
|
|
}
|
|
|
|
protected function fetchArray($cursor = null)
|
|
{
|
|
if (!empty($cursor) && $cursor instanceof PDOStatement)
|
|
{
|
|
return $cursor->fetch(PDO::FETCH_NUM);
|
|
}
|
|
|
|
if ($this->prepared instanceof PDOStatement)
|
|
{
|
|
return $this->prepared->fetch(PDO::FETCH_NUM);
|
|
}
|
|
}
|
|
|
|
protected function fetchObject($cursor = null, $class = 'stdClass')
|
|
{
|
|
if (!empty($cursor) && $cursor instanceof PDOStatement)
|
|
{
|
|
return $cursor->fetchObject($class);
|
|
}
|
|
|
|
if ($this->prepared instanceof PDOStatement)
|
|
{
|
|
return $this->prepared->fetchObject($class);
|
|
}
|
|
}
|
|
}
|