pg_escape_bytea
If your database is a UTF-8 database, you will run into problems trying to add some data into your database...
for securty issues and/or compatability you may need to use the: utf_encode() (http://php.net/utf8-encode) function.
for example:
<?php
$my_data = pg_escape_string(utf8_encode($_POST['my_data']));
?>
pg_escape_string
(PHP 4 >= 4.2.0, PHP 5)
pg_escape_string — Konwertuje łańcuch wpisywany do pola tekstowego, wstawiając sekwencje Escape
Opis
string pg_escape_string
([ resource $polaczenie
], string $dane
)
pg_escape_string() konwertuje łańcuch wstawiając sekwencje Escape przy wpisywaniu do bazy danych. Zwraca łańcuch z sekwencjami Escape w formacie PostgreSQL-a. Zalecane jest używanie tej funkcji w miejsce addslashes(). Jeśli typem kolumny jest bytea, trzeba użyć funkcji pg_escape_bytea() zamiast tej.
Informacja: Funkcja wymaga PostgreSQL 7.2 lub nowszego.
Parametry
- polaczenie
-
Identyfikator połączenia do bazy danych. Gdy polaczenie nie zostało podane, domyślne połączenie jest użyte. Domyślnym połączeniem jest ostatnie połączenie stworzone przez pg_connect() lub pg_pconnect().
- dane
-
Łańcuch (ang. string) zawierający tekst bez sekwencji Escape.
Zwracane wartości
Łańcuch (ang. string) zawierający dane z sekwencjami Escape.
Rejestr zmian
| Wersja | Opis |
|---|---|
| 5.2.0 | Parametr polaczenie został dodany |
Przykłady
Example #1 pg_escape_string() - przykład
<?php
// Połączenie do bazy danych
$polaczenie = pg_connect('dbname=foo');
// Przeczytaj plik tekstowy (zawierający apostrofy i ukośniki wsteczne)
$dane = file_get_contents('list.txt');
// Dodaj sekwencje Escape do danych
$z_escape = pg_escape_string($dane);
// Wpisz to do bazy danych
pg_query("INSERT INTO korespondencja (nazwa, dane) VALUES ('Moj list', '{$z_escape}')");
?>
add a note
User Contributed Notespg_escape_string
Nathan Bruer
08-Feb-2008 10:23
08-Feb-2008 10:23
Gautam Khanna
29-Aug-2007 04:55
29-Aug-2007 04:55
Security methods which you use depend on the specific purpose. For those who dont know, take a look at the following built-in PHP functions:
strip_tags() to remove HTML characters
(also see htmlspecialchars)
escapeshellarg() to escape shell commands etc
escapeshellcmd()
mysql_real_escape_string() to escape mySQL commands.
Enjoy!
web dot expert dot panel at gmail dot com
Gautam Khanna
29-Aug-2007 04:54
29-Aug-2007 04:54
Security methods which you use depend on the specific purpose. For those who dont know, take a look at the following built-in PHP functions:
strip_tags() to remove HTML characters
(also see htmlspecialchars)
escapeshellarg() to escape shell commands etc
escapeshellcmd()
mysql_real_escape_string() to escape mySQL commands.
Enjoy!
web dot expert dot panel at gmail dot com
johniskew2 at yahoo dot com
30-May-2006 06:43
30-May-2006 06:43
For those who escape their single quotes with a backslash (ie \') instead of two single quotes in a row (ie '') there has recently been a SERIOUS sql injection vulnerability that can be employed taking advantage of your chosen escaping method. More info here: http://www.postgresql.org/docs/techdocs.50
Even after the postgre update, you may still be limited to what you can do with your queries if you still insist on backslash escaping. It's a lesson to always use the PHP functions to do proper escaping instead of adhoc addslashes or magic quotes escaping.
meng
28-May-2006 01:21
28-May-2006 01:21
Since php 5.1 the new function pg_query_params() was introduced. With this function you can use bind variables and don't have to escape strings. If you can use it, do so. If unsure why, check the changelog for Postgres 8.0.8.
otix
25-Apr-2006 12:43
25-Apr-2006 12:43
Creating a double-tick is just fine. It works the same as the backslash-tick syntax. From the PostgreSQL docs:
The fact that string constants are bound by single quotes presents an obvious semantic problem, however, in that if the sequence itself contains a single quote, the literal bounds of the constant are made ambiguous. To escape (make literal) a single quote within the string, you may type two adjacent single quotes. The parser will interpret the two adjacent single quotes within the string constant as a single, literal single quote. PostgreSQL will also allow single quotes to be embedded by using a C-style backslash.
dominik dot mueller at access dot unizh dot ch
15-Jan-2006 06:40
15-Jan-2006 06:40
in reply to "rich at dicksonlife dot com"
use serialize() / unserialize() instead!
rich at dicksonlife dot com
19-Jul-2005 02:38
19-Jul-2005 02:38
Here's some code I knocked up to turn an array of values into a string representation of an array. Note that I also add the external single quotes to make it a full string literal.
//$t is array to be escaped. $u will be string literal.
$tv=array();
foreach($t as $key=>$val){
$tv[$key]="\"" .
str_replace("\"",'\\"', str_replace('\\','\\\\',$val)) . "\"
";
}
$u= implode(",",$tv) ;
$u="'{" . pg_escape_string($u) . "}'";
There's probably a better way of doing this. That's why I'm posting this here :)
tsharek at o2 dot pl
02-Mar-2005 12:34
02-Mar-2005 12:34
IMO the stripslashes in this case is not very usefull. Because pg_escape_string change ' into '' (double ' - not "). I use in add to database this:
pg_escape_string(stripslashes($_GET['var'])) and is in 100% safe (i hope).
If I use addslashes in this case that well be lost space in database (\''' - this is 3 bytes)
ps. sorry for my english:)
16-Jul-2003 08:30
Here with 'abc'efg' the middle ' terminates the string, however 'abc\'def' is one big string with a ' character in the middle.
If the user can terminate the string he can then put in the bad sql. When prompted for Barcode the user could put in DROP TABLE foo; SELECT '1
$query = sprintf ("SELECT * FROM a.tblcards WHERE barcode='%s'", pg_escape_string($barcode));
So you have to "clean" your variable coming in to prevent that.