<?php

/**
 * A result-set from a MSSQL database.
 * 
 * @package mssql
 */
class SQLServerQuery extends SS_Query {

	/**
	 * The SQLServerConnector object that created this result set.
	 * 
	 * @var SQLServerConnector
	 */
	private $connector;

	/**
	 * The internal MSSQL handle that points to the result set.
	 * 
	 * @var resource
	 */
	private $handle;

	/**
	 * Hook the result-set given into a Query class, suitable for use by sapphire.
	 * @param SQLServerConnector $connector The database object that created this query.
	 * @param resource $handle the internal mssql handle that is points to the resultset.
	 */
	public function __construct(SQLServerConnector $connector, $handle) {
		$this->connector = $connector;
		$this->handle = $handle;
	}

	public function __destruct() {
		if(is_resource($this->handle)) {
			sqlsrv_free_stmt($this->handle);
		}
	}

	public function seek($row) {
		if(!is_resource($this->handle)) return false;

		user_error('MSSQLQuery::seek() not supported in sqlsrv', E_USER_WARNING);
	}

	public function numRecords() {
		if(!is_resource($this->handle)) return false;

		// WARNING: This will only work if the cursor type is scrollable!
		if(function_exists('sqlsrv_num_rows')) {
			return sqlsrv_num_rows($this->handle);
		} else {
			user_error('MSSQLQuery::numRecords() not supported in this version of sqlsrv', E_USER_WARNING);
		}
	}

	public function nextRecord() {
		if(!is_resource($this->handle)) return false;

		if($data = sqlsrv_fetch_array($this->handle, SQLSRV_FETCH_ASSOC)) {
			// special case for sqlsrv - date values are DateTime coming out of the sqlsrv drivers,
			// so we convert to the usual Y-m-d H:i:s value!
			foreach($data as $name => $value) {
				if($value instanceof DateTime) $data[$name] = $value->format('Y-m-d H:i:s');
			}
			return $data;
		} else {
			// Free the handle if there are no more results - sqlsrv crashes if there are too many handles
			sqlsrv_free_stmt($this->handle);
			$this->handle = null;
		}

		return false;
	}

}