pg_update

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

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.

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_FORCE_NULL, PGSQL_DML_NO_CONV, PGSQL_DML_ESCAPE, PGSQL_DML_EXEC, PGSQL_DML_ASYNC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the options then query string is returned. When PGSQL_DML_NO_CONV or PGSQL_DML_ESCAPE is set, it does not call pg_convert() internally.

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";
  }
?>

Changelog

Version	Description
5.6.0	No longer experimental. Added `PGSQL_DML_ESCAPE` constant, `TRUE`/`FALSE` and `NULL` data type support.
5.5.3/5.4.19	Direct SQL injection to `table_name` and Indirect SQL injection to identifiers are fixed.

User Contributed Notes

dominik dot bonsch at homesono dot de

8 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.

sdibb at myway dot com

10 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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