From 271056648bf8cc5da575c6c507f743b24c47ceca Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@bofh.bg>
Date: Sun, 24 Jun 2012 22:44:00 +0300
Subject: Add pdo_sqlite subdriver

---
 system/database/drivers/pdo/pdo_driver.php         |  45 +-----
 .../drivers/pdo/subdrivers/pdo_sqlite_driver.php   | 167 +++++++++++++++++++++
 2 files changed, 170 insertions(+), 42 deletions(-)
 create mode 100644 system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php

diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index 9fbdfdd55..b16ca8219 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -151,20 +151,6 @@ class CI_DB_pdo_driver extends CI_DB {
 		        $this->dsn .= 'database='.$this->database.';';
 	    	}
 	    }
-	    elseif ($this->subdriver === 'sqlite' && $this->dsn === 'sqlite:')
-	    {
-	        if ($this->database !== ':memory')
-	        {
-	            if ( ! file_exists($this->database))
-	            {
-	                show_error('Invalid DB Connection string for PDO SQLite');
-	            }
-
-	            $this->dsn .= (strpos($this->database, DIRECTORY_SEPARATOR) !== 0) ? DIRECTORY_SEPARATOR : '';
-	        }
-
-	        $this->dsn .= $this->database;
-	    }
 
 	    // Add charset to the DSN, if needed
 	    if ( ! empty($this->char_set) && in_array($this->subdriver, array('4D', 'sybase', 'mssql', 'dblib')))
@@ -378,15 +364,7 @@ class CI_DB_pdo_driver extends CI_DB {
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
-		if ($this->subdriver === 'sqlite')
-		{
-			// Analog function to show all tables in sqlite
-			$sql = "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'";
-		}
-		else
-		{
-			$sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
-		}
+		$sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
 
 		if ($prefix_limit !== FALSE AND $this->dbprefix !== '')
 		{
@@ -423,12 +401,6 @@ class CI_DB_pdo_driver extends CI_DB {
 	 */
 	protected function _field_data($table)
 	{
-		if ($this->subdriver === 'sqlite')
-		{
-			// Analog function for sqlite
-			return 'PRAGMA table_info('.$this->escape_identifiers($table).')';
-		}
-
 		return 'SELECT TOP 1 FROM '.$this->escape_identifiers($table);
 	}
 
@@ -544,19 +516,8 @@ class CI_DB_pdo_driver extends CI_DB {
 	 */
 	protected function _limit($sql, $limit, $offset)
 	{
-		if ($this->subdriver === 'cubrid' OR $this->subdriver === 'sqlite')
-		{
-			$offset = ($offset == 0) ? '' : $offset.', ';
-
-			return $sql.'LIMIT '.$offset.$limit;
-		}
-		else
-		{
-			$sql .= 'LIMIT '.$limit;
-			$sql .= ($offset > 0) ? ' OFFSET '.$offset : '';
-
-			return $sql;
-		}
+		$offset = ($offset == 0) ? '' : $offset.', ';
+		return $sql.'LIMIT '.$offset.$limit;
 	}
 
 }
diff --git a/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php b/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php
new file mode 100644
index 000000000..f01ff1b93
--- /dev/null
+++ b/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php
@@ -0,0 +1,167 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.2.4 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0.0
+ * @filesource
+ */
+
+/**
+ * PDO Oracle Database Adapter Class
+ *
+ * Note: _DB is an extender class that the app controller
+ * creates dynamically based on whether the query builder
+ * class is being used or not.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Drivers
+ * @category	Database
+ * @author		EllisLab Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_pdo_sqlite_driver extends CI_DB_pdo_driver {
+
+	public $subdriver = 'sqlite';
+
+	/**
+	 * The syntax to count rows is slightly different across different
+	 * database engines, so this string appears in each driver and is
+	 * used for the count_all() and count_all_results() functions.
+	 */
+	protected $_random_keyword = ' RANDOM()'; // Currently not supported
+
+	/**
+	 * Constructor
+	 *
+	 * Builds the DSN if not already set.
+	 *
+	 * @param	array
+	 * @return	void
+	 */
+	public function __construct($params)
+	{
+		parent::__construct($params);
+
+		if (empty($this->dsn))
+		{
+			$this->dsn = 'sqlite:';
+
+			if (empty($this->database) && empty($this->hostname))
+			{
+				$this->database = ':memory:';
+			}
+
+			$this->database = empty($this->database) ? $this->hostname : $this->database;
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Show table query
+	 *
+	 * Generates a platform-specific query string so that the table names can be fetched
+	 *
+	 * @param	bool
+	 * @return	string
+	 */
+	protected function _list_tables($prefix_limit = FALSE)
+	{
+		$sql = 'SELECT "NAME" FROM "SQLITE_MASTER" WHERE "TYPE" = \'table\'';
+
+		if ($prefix_limit === TRUE && $this->dbprefix !== '')
+		{
+			return $sql.' AND "NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
+				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
+		}
+
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Show column query
+	 *
+	 * Generates a platform-specific query string so that the column names can be fetched
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _list_columns($table = '')
+	{
+		// Not supported
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Field data query
+	 *
+	 * Generates a platform-specific query so that the column data can be retrieved
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _field_data($table)
+	{
+		return 'SELECT * FROM '.$this->protect_identifiers($table).' LIMIT 0,1';
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Replace statement
+	 *
+	 * @param	string	the table name
+	 * @param	array	the insert keys
+	 * @param	array	the insert values
+	 * @return 	string
+	 */
+	protected function _replace($table, $keys, $values)
+	{
+		return 'INSERT OR '.parent::_replace($table, $keys, $values);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 *
+	 * If the database does not support the truncate() command,
+	 * then this method maps to 'DELETE FROM table'
+	 *
+	 * @param	string	the table name
+	 * @return	string
+         */
+	protected function _truncate($table)
+	{
+		return 'DELETE FROM '.$table;
+	}
+
+}
+
+/* End of file pdo_sqlite_driver.php */
+/* Location: ./system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php */
\ No newline at end of file
-- 
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