Fixed a number of bug reports related to table/db names not being escaped or prefixed correctly.

1 files changed, 22 insertions, 82 deletions

diff --git a/system/database/drivers/sqlite/sqlite_driver.php b/system/database/drivers/sqlite/sqlite_driver.php
index df19dba78..0ba483f8b 100644
--- a/system/database/drivers/sqlite/sqlite_driver.php
+++ b/system/database/drivers/sqlite/sqlite_driver.php
@@ -33,6 +33,9 @@
 class CI_DB_sqlite_driver extends CI_DB {

 

 	var $dbdriver = 'sqlite';

+	

+	// The character used to escape with - not needed for SQLite

+	var $_escape_char = '';

 

 	/**

 	 * The syntax to count rows is slightly different across different

@@ -300,7 +303,7 @@ class CI_DB_sqlite_driver extends CI_DB {
 		if ($table == '')

 			return '0';

 	

-		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($this->dbprefix.$table));

+		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));

 		

 		if ($query->num_rows() == 0)

 			return '0';

@@ -361,7 +364,7 @@ class CI_DB_sqlite_driver extends CI_DB {
 	 */

 	function _field_data($table)

 	{

-		return "SELECT * FROM ".$this->_escape_table($table)." LIMIT 1";

+		return "SELECT * FROM ".$table." LIMIT 1";

 	}

 

 	// --------------------------------------------------------------------

@@ -393,97 +396,32 @@ class CI_DB_sqlite_driver extends CI_DB {
 	// --------------------------------------------------------------------

 

 	/**

-	 * Escape Column Name

-	 *

-	 * This function adds backticks around supplied column name

-	 *

-	 * @access	private

-	 * @param	string	the column name

-	 * @return	string

-	 */

-	function _escape_column($column)

-	{

-		// Not necessary with SQLite so we simply return the value

-		return $column;

-	}

-			

-	// --------------------------------------------------------------------

-

-	/**

-	 * Escape Table Name

+	 * Escape the SQL Identifiers

 	 *

-	 * This function adds backticks if the table name has a period

-	 * in it. Some DBs will get cranky unless periods are escaped

+	 * This function escapes column and table names

 	 *

 	 * @access	private

-	 * @param	string	the table name

+	 * @param	string

 	 * @return	string

 	 */

-	function _escape_table($table)

+	function _escape_identifiers($item)

 	{

-		// other database drivers use this to add backticks, hence this

-		// function is simply going to return the tablename for sqlite		

-		return $table;

-	}

-		

-	// --------------------------------------------------------------------

-

-	/**

-	 * Protect Identifiers

-	 *

-	 * This function adds backticks if appropriate based on db type

-	 *

-	 * @access	private

-	 * @param	mixed	the item to escape

-	 * @param	boolean	only affect the first word

-	 * @return	mixed	the item with backticks

-	 */

-	function _protect_identifiers($item, $first_word_only = FALSE)

-	{

-		if (is_array($item))

+		if ($this->_escape_char == '')

 		{

-			$escaped_array = array();

-

-			foreach($item as $k=>$v)

-			{

-				$escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v, $first_word_only);

-			}

-

-			return $escaped_array;

-		}	

-

-		// This function may get "item1 item2" as a string, and so

-		// we may need "item1 item2" and not "item1 item2"

-		if (ctype_alnum($item) === FALSE)

+			return $item;

+		}

+	

+		if (strpos($item, '.') !== FALSE)

 		{

-			if (strpos($item, '.') !== FALSE)

-			{

-				$aliased_tables = implode(".",$this->ar_aliased_tables).'.';

-				$table_name =  substr($item, 0, strpos($item, '.')+1);

-				$item = (strpos($aliased_tables, $table_name) !== FALSE) ? $item = $item : $this->dbprefix.$item;

-			}

-

-			// This function may get "field >= 1", and need it to return "field >= 1"

-			$lbound = ($first_word_only === TRUE) ? '' : '|\s|\(';

-

-			$item = preg_replace('/(^'.$lbound.')([\w\d\-\_]+?)(\s|\)|$)/iS', '$1$2$3', $item);

+			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;			

 		}

 		else

 		{

-			return "{$item}";

+			$str = $this->_escape_char.$item.$this->_escape_char;

 		}

-

-		$exceptions = array('AS', '/', '-', '%', '+', '*', 'OR', 'IS');

-		

-		foreach ($exceptions as $exception)

-		{

 		

-			if (stristr($item, " {$exception} ") !== FALSE)

-			{

-				$item = preg_replace('/ ('.preg_quote($exception).') /i', ' $1 ', $item);

-			}

-		}

-		return $item;

+		// remove duplicates if the user already included the escape

+		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);

 	}

 			

 	// --------------------------------------------------------------------

@@ -523,7 +461,7 @@ class CI_DB_sqlite_driver extends CI_DB {
 	 */

 	function _insert($table, $keys, $values)

 	{	

-		return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";

+		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";

 	}

 	

 	// --------------------------------------------------------------------

@@ -552,8 +490,10 @@ class CI_DB_sqlite_driver extends CI_DB {
 		

 		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

 	

-		$sql = "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr);

+		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);

+

 		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';

+

 		$sql .= $orderby.$limit;

 		

 		return $sql;