Библиотека для cis, online, cms1

creole/drivers/pgsql/PgSQLResultSetIterator.php

@@ -0,0 +1,109 @@
+<?php
+/*
+ *  $Id: PgSQLResultSetIterator.php,v 1.1 2004/12/04 05:58:53 gamr Exp $
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information please see
+ * <http://creole.phpdb.org>.
+ */
+
+/**
+ * Optimized iterator for PostgreSQL, based off of SQLite iterator.
+ * Testing with SeekableIterator, no idea if it will keep this
+ * functionality or what uses it or even how to use it as yet.
+ * 
+ * @author    Cameron Brunner <webmaster@animetorrents.com>
+ * @version   $Revision: 1.1 $
+ * @package   creole.drivers.pgsql
+ */
+class PgSQLResultSetIterator implements SeekableIterator, Countable {
+
+    private $result;
+    private $pos = 0;
+    private $fetchmode;
+    private $row_count;
+    private $rs;
+    
+    /**
+     * Construct the iterator.
+     * @param PgSQLResultSet $rs
+     */
+    public function __construct(PgSQLResultSet $rs)
+    {
+        $this->result = $rs->getResource();
+        $this->fetchmode = $rs->getFetchmode();
+		$this->row_count = $rs->getRecordCount();
+		$this->rs = $rs; // This is to address reference count bug: http://creole.phpdb.org/trac/ticket/6
+    }
+    
+    /**
+     * This method actually has no effect, since we do not rewind ResultSet for iteration.
+     */
+    function rewind()
+    {        
+        $this->pos = 0;
+    }
+    
+    function valid()
+    {
+		return ( $this->pos < $this->row_count );
+    }
+    
+    /**
+     * Returns the cursor position.  Note that this will not necessarily
+     * be 1 for the first row, since no rewind is performed at beginning
+     * of iteration.
+     * @return int
+     */
+    function key()
+    {
+        return $this->pos;
+    }
+    
+    /**
+     * Returns the row (assoc array) at current cursor pos.
+     * @return array
+     */
+    function current()
+    {
+       return pg_fetch_array($this->result, $this->pos, $this->fetchmode);
+    }
+    
+    /**
+     * Advances internal cursor pos.
+     */
+    function next()
+    {
+        $this->pos++;
+    }
+
+    /**
+     * Sets cursor to specific value.
+     */
+    function seek ( $index )
+    {
+    	if ( ! is_int ( $index ) ) {
+			throw new InvalidArgumentException ( 'Invalid arguement to seek' );
+		}
+		if ( $index < 0 || $index > $this->row_count ) {
+			throw new OutOfBoundsException ( 'Invalid seek position' );
+		}
+		$this->pos = $index;
+    }
+
+    function count ( ) {
+		return $this->row_count;
+    }
+}