PHP 5.4.35 Released

pg_update

(PHP 4 >= 4.3.0, PHP 5)

pg_update Update table

Description

mixed pg_update ( resource $connection , string $table_name , array $data , array $condition [, int $options = PGSQL_DML_EXEC ] )

pg_update() updates records that matches condition with data. If options is specified, pg_convert() is applied to data with specified options.

Warning

This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.

Parameters

connection

PostgreSQL database connection resource.

table_name

Name of the table into which to update rows.

data

An array whose keys are field names in the table table_name, and whose values are what matched rows are to be updated to.

condition

An array whose keys are field names in the table table_name, and whose values are the conditions that a row must meet to be updated.

options

Any number of PGSQL_CONV_OPTS, PGSQL_DML_NO_CONV, PGSQL_DML_EXEC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the options then query string is returned.

Return Values

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

Examples

Example #1 pg_update() example

<?php 
  $db 
pg_connect('dbname=foo');
  
$data = array('field1'=>'AA''field2'=>'BB');
  
  
// This is safe, since $_POST is converted automatically
  
$res pg_update($db'post_log'$_POST$data);
  if (
$res) {
      echo 
"Data is updated: $res\n";
  } else {
      echo 
"User must have sent wrong inputs\n";
  }
?>

See Also

  • pg_convert() - Convert associative array values into suitable for SQL statement

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User Contributed Notes 3 notes

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1
sdibb at myway dot com
9 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, $arr_update, $arr_where);
?>
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0
dominik dot bonsch at homesono dot de
6 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.
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0
jhooks
8 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.
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