pg_update

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

    pg_update — Update table

    Description

    function pg_update(
        PgSql\Connection $connection,
        string $table_name,
        array $values,
        array $conditions,
        int $flags = PGSQL_DML_EXEC
    ): string|bool

    pg_update() updates records that matches conditions with values.

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

    By default pg_update() passes raw values. Values must be escaped or the PGSQL_DML_ESCAPE flag must be specified in flags. 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.

    Parameters

    connection
    An PgSql\Connection instance.
    table_name

    Name of the table into which to update rows.

    values

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

    conditions

    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.

    flags

    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 flags 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 flags.

    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.
  $res = pg_update($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 forms suitable for SQL statements

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    User Contributed Notes 3 notes

    up
    2
    dominik dot bonsch at homesono dot de
    18 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.
    up
    -2
    jhooks
    20 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.
    up
    -4
    sdibb at myway dot com
    21 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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