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<?php

/**
 * This file is part of the Nette Framework (http://nette.org)
 * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
 */

namespace Nette\Database;

use Nette;


/**
 * Database context.
 *
 * @author     David Grudl
 */
class Context extends Nette\Object
{
	/** @var Connection */
	private $connection;

	/** @var IReflection */
	private $reflection;

	/** @var Nette\Caching\IStorage */
	private $cacheStorage;

	/** @var SqlPreprocessor */
	private $preprocessor;


	public function __construct(Connection $connection, IReflection $reflection = NULL, Nette\Caching\IStorage $cacheStorage = NULL)
	{
		$this->connection = $connection;
		$this->reflection = $reflection ?: new Reflection\ConventionalReflection;
		$this->cacheStorage = $cacheStorage;
	}


	/** @return void */
	public function beginTransaction()
	{
		$this->queryArgs('::beginTransaction', array());
	}


	/** @return void */
	public function commit()
	{
		$this->queryArgs('::commit', array());
	}


	/** @return void */
	public function rollBack()
	{
		$this->queryArgs('::rollBack', array());
	}


	/**
	 * @param  string  sequence object
	 * @return string
	 */
	public function getInsertId($name = NULL)
	{
		return $this->connection->getInsertId($name);
	}


	/**
	 * Generates and executes SQL query.
	 * @param  string  statement
	 * @param  mixed   [parameters, ...]
	 * @return ResultSet
	 */
	public function query($statement)
	{
		$args = func_get_args();
		return $this->queryArgs(array_shift($args), $args);
	}


	/**
	 * @param  string  statement
	 * @param  array
	 * @return ResultSet
	 */
	public function queryArgs($statement, array $params)
	{
		$this->connection->connect();
		if ($params) {
			if (!$this->preprocessor) {
				$this->preprocessor = new SqlPreprocessor($this->connection);
			}
			array_unshift($params, $statement);
			list($statement, $params) = $this->preprocessor->process($params);
		}

		try {
			$result = new ResultSet($this->connection, $statement, $params);
		} catch (\PDOException $e) {
			$e->queryString = $statement;
			$this->connection->onQuery($this->connection, $e);
			throw $e;
		}
		$this->connection->onQuery($this->connection, $result);
		return $result;
	}


	/** @return Nette\Database\Table\Selection */
	public function table($table)
	{
		return new Table\Selection($this->connection, $table, $this->reflection, $this->cacheStorage);
	}


	/** @return Connection */
	public function getConnection()
	{
		return $this->connection;
	}


	/** @return IReflection */
	public function getDatabaseReflection()
	{
		return $this->reflection;
	}


	/********************* shortcuts ****************d*g**/


	/**
	 * Shortcut for query()->fetch()
	 * @param  string  statement
	 * @param  mixed   [parameters, ...]
	 * @return Row
	 */
	public function fetch($args)
	{
		$args = func_get_args();
		return $this->queryArgs(array_shift($args), $args)->fetch();
	}


	/**
	 * Shortcut for query()->fetchField()
	 * @param  string  statement
	 * @param  mixed   [parameters, ...]
	 * @return mixed
	 */
	public function fetchField($args)
	{
		$args = func_get_args();
		return $this->queryArgs(array_shift($args), $args)->fetchField();
	}


	/**
	 * Shortcut for query()->fetchPairs()
	 * @param  string  statement
	 * @param  mixed   [parameters, ...]
	 * @return array
	 */
	public function fetchPairs($args)
	{
		$args = func_get_args();
		return $this->queryArgs(array_shift($args), $args)->fetchPairs();
	}


	/**
	 * Shortcut for query()->fetchAll()
	 * @param  string  statement
	 * @param  mixed   [parameters, ...]
	 * @return array
	 */
	public function fetchAll($args)
	{
		$args = func_get_args();
		return $this->queryArgs(array_shift($args), $args)->fetchAll();
	}


	/**
	 * @return SqlLiteral
	 */
	public static function literal($value)
	{
		$args = func_get_args();
		return new SqlLiteral(array_shift($args), $args);
	}

}