Added check for quote mark

system/database/drivers/pdo/pdo_driver.php

@@ -313,7 +313,10 @@ function escape_str($str, $like = FALSE)
 		$str = $this->conn_id->quote($str);
 
 		//If there are duplicated quotes, trim them away
-		$str = substr($str, 1, -1);
+		if(strpos($str, "'") === 0)
+		{
+			$str = substr($str, 1, -1);
+		}
 
 		// escape LIKE condition wildcards
 		if ($like === TRUE)
@@ -349,25 +352,7 @@ function affected_rows()
 	 */
 	function insert_id($name=NULL)
 	{
-		//Convenience method for postgres insertid
-		if(strpos($this->hostname, 'pgsql') !== FALSE)
-		{
-			$v = $this->_version();
-
-			$table	= func_num_args() > 0 ? func_get_arg(0) : NULL;
-
-			if ($table == NULL && $v >= '8.1')
-			{
-				$sql='SELECT LASTVAL() as ins_id';
-			}
-			$query = $this->query($sql);
-			$row = $query->row();
-			return $row->ins_id;
-		}
-		else
-		{
-			return $this->conn_id->lastInsertId($name);
-		}
+		return $this->conn_id->lastInsertId($name);
 	}
 
 	// --------------------------------------------------------------------
@@ -418,7 +403,6 @@ function _list_tables($prefix_limit = FALSE)
 
 		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
 		{
-			//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
 			return FALSE; // not currently supported
 		}