PHP: pg_update - Manual (original) (raw)

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

pg_update — Update table

Description

If flags is specified,pg_convert() is applied tovalues with the specified flags.

By default pg_update() passes raw values. Values must be escaped or the [PGSQL_DML_ESCAPE](pgsql.constants.php#constant.pgsql-dml-escape) flag must be specified in flags.[PGSQL_DML_ESCAPE](pgsql.constants.php#constant.pgsql-dml-escape) quotes and escapes parameters/identifiers. Therefore, table/column names become case sensitive.

Note that neither escape nor prepared query can protect LIKE query, JSON, Array, Regex, etc. These parameters should be handled according to their contexts. i.e. Escape/validate values.

Changelog

Version	Description
8.1.0	The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.

Examples

Example #1 pg_update() example

<?php $db = pg_connect('dbname=foo'); $data = array('field1'=>'AA', 'field2'=>'BB'); // This is safe somewhat, since all values are escaped. // However PostgreSQL supports JSON/Array. These are not // safe by neither escape nor prepared query. <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mo>=</mo><mi>p</mi><msub><mi>g</mi><mi>u</mi></msub><mi>p</mi><mi>d</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">res = pg_update(</annotation></semantics></math>res=pgupdate(db, 'post_log', <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow></mrow><mi>P</mi></msub><mi>O</mi><mi>S</mi><mi>T</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">_POST, </annotation></semantics></math>POST,data); if ($res) { echo "Data is updated: $res\n"; } else { echo "User must have sent wrong inputs\n"; } ?>

Found A Problem?

dominik dot bonsch at homesono dot de ¶

17 years ago

Using pg_update() and pg_insert() without key validation is not secure! 

You need to check which data pairs you get, and if you want to allow to updated this column. 

Example: 

You have a table with tree colums: username, password, userlevel. 

Your users may change only their username, and their password but not their userlevel.

If you don't filter the keys in the request array, every user can now change his userlevel just by sending a POST Request with "userlevel=>100".

So if you don't check if the key are allowed in your request array you'll get serious sql injection vulnarabilities in your code.

jhooks ¶

19 years ago

> Return Values
> 
> Returns TRUE on success or FALSE on failure. Returns string if 
> PGSQL_DML_STRING is passed via options. 

I have found in my copy of PHP (version 4.4.0) that if you use the 'PGSQL_DML_STRING' option, the function does not execute any query.  It merely returns the query which would have been executed.  

Another thing I noticed, pg_update does not seem to make use of pg_trace (atleast in 4.4.0).

PS this isn't a bug report, just an explanation of some undocumented features I noticed.  As the manual says, the function is still in development so this behaviour may differ from version to version.

sdibb at myway dot com ¶

20 years ago

This function is similar to PEAR::DB's autoExecute() function, with the only difference being that the where clause is an array instead of a string.

Also, if you want to use your instance of the DB class with this function, you can reference the existing resource connection with $db->connection.

An example would be:
<?
     pg_update($db->connection, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>a</mi><mi>r</mi><msub><mi>r</mi><mi>u</mi></msub><mi>p</mi><mi>d</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">arr_update, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">u</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">p</span><span class="mord mathnormal">d</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mpunct">,</span></span></span></span>arr_where);
?>

PHP: pg_update - Manual (original) (raw)

Description

Changelog

Examples

See Also

Found A Problem?