pg_fetch_assoc
PostgreSQL boolean true becomes string "t"
PostgreSQL boolean false becomes string "f"
This is ambiguous, and leads to code duplication. I wonder why aren't the types correctly typed when fetching values. We could at least have an optional parameter to enable that.
pg_fetch_object
(PHP 4, PHP 5)
pg_fetch_object — Retorna uma linha (registro) como um objeto
Descrição
objeto pg_fetch_object
( resource $result
, int $row
[, int $result_type
] )
pg_fetch_object() retorna um objeto com propriedades que correspondem à linha recuperada. Retorna FALSE se não existem mais linhas ou no caso de erro.
pg_fetch_object() é similar a pg_fetch_array(), com uma diferença - um objeto é retornado, ao invés de um array. Indiretamente, isto significa que você pode acessar os dados somente através dos nomes de campos, e não por seus índices (números são nomes inválidos de propriedades).
row é o número da linha (registro) a ser recuperada. A primeira linha é 0.
Em termos de performance, a função é idêntica a pg_fetch_array(), e quase tão rápida quanto pg_fetch_row() (a diferença é insignificante).
Nota: A partir do PHP 4.1.0, row é opcional.
A partir do PHP 4.3.0, result_type tem PGSQL_ASSOC como valor padrão, enquanto em outras versões mais antigas o padrão é PGSQL_BOTH. Não há utilidade para a propriedade numérica, já que nomes de propriedades numéricas são inválidas em PHP.
O parâmetro result_type deverá ser removido em versões futuras.
Exemplo #1 Postgres fetch object
<?php
$database = "store";
$db_conn = pg_connect("host=localhost port=5432 dbname=$database");
if (!$db_conn) {
echo "Failed connecting to postgres database $database\n";
exit;
}
$qu = pg_query($db_conn, "SELECT * FROM books ORDER BY author");
$row = 0; // postgres needs a row counter
while ($data = pg_fetch_object($qu, $row)) {
echo $data->author . " (";
echo $data->year . "): ";
echo $data->title . "<br />";
$row++;
}
pg_free_result ($qu);
pg_close ($db_conn);
?>
Nota: A partir do PHP 4.1.0, row tornou-se opcional. Ao chamar pg_fetch_object() o contador de linhas interno será acrescentado de 1.
Veja também pg_query(), pg_fetch_array(), pg_fetch_row() e pg_fetch_result().
add a note
User Contributed Notespg_fetch_object
ekevu at yahoo dot com
02-Jul-2007 07:36
02-Jul-2007 07:36
robeddielee at hotmail dot com
27-Jan-2006 11:38
27-Jan-2006 11:38
I noticed that many people use FOR loops to extract query data. This is the method I use to extract data.
<?php
@$members = pg_query($db_conn, 'SELECT id,name FROM boards.members ORDER BY name;');
if ($members AND pg_num_rows($members)) {
while ($member = pg_fetch_object($members)) {
echo $member->name.' ('.$member->id.')';
}
}
?>
If an error occurs (or nothing is returned) in the above code nothing will output. An ELSE clause can be added to the IF to handle query errors (or nothing being returned). Or a seperate check can be performed for the event that nothing is returned by using an ELSEIF clause.
I like this method because it doesn't use any temporary counter variables.
oracle dot shinoda at gmail dot com
15-Nov-2004 06:13
15-Nov-2004 06:13
If you're wanting to use objects for your results, but are put off because you can't seem to apply a function to each field of the result (like stripslashes for example), try this code:
<?php
// Code to connect, do query etc etc...
$row = pg_fetch_object($result);
$vars = get_object_vars($row);
foreach ( $vars as $key => $var )
{
$row->{$key} = stripslashes($var);
}
?>
michiel at minas-2 dot demon dot nl
16-Jun-2004 08:13
16-Jun-2004 08:13
Something I have learned to use:
$result=$pg_query (...);
$num = pg_numrows($result);
for($count=0;$count < $num && $data=pg_fetch_object($result,$count);$count++)
{
printf("<tr>\n");
printf(" <td>%s</td>\n",$data->foo);
printf(" <td>%s</td>\n",$data->bar);
printf("</tr>\n");
}
Lars at dybdahl dot dk
14-Oct-2003 08:43
14-Oct-2003 08:43
When you retrieve the contents of a "timestamp with timezone" field, this will set the environment's timezone variables. Therefore, this is dangerous:
$s=$row->mydatefield;
$unixtimestamp=postgresqltimestamp2unix($s);
echo date("Y-m-d H:i:s",$unixtimestamp);
Here, postgresqltimestamp2unix is a function that converts the postgresql timestamp to Unix. The retrieval of the field data in the first line of the example above will influence the timezone used in date() in the third line.
ian at eiloart dot com
09-Feb-2003 07:27
09-Feb-2003 07:27
This isn't all that useful. If you do, for example, foreach($row as $field) then you still get every value twice!
You can do something like this, though:
foreach ($line as $key => $cell){
if (! is_numeric($key)){
echo "<td>$key $cell</td>";
}
}
is is_numeric strict enough?
inbox at bucksvsbytes dot com
16-Mar-2002 09:13
16-Mar-2002 09:13
The result_type arg is either invalid or incorrectly documented, since the "result_type is optional..." paragraph is copied verbatim from pg_fetch_array, and the PGSQL_NUM option is in conflict with the preceding paragraph's, "you can only access the data by the field names, and not by their
offsets."