pg_fetch_object

(PHP 4, PHP 5, PHP 7)

pg_fetch_object — Fetch a row as an object

Descrierea

pg_fetch_object ( resource $result [, int $row [, int $result_type = PGSQL_ASSOC ]] ) : object

pg_fetch_object ( resource $result [, int $row [, string $class_name [, array $params ]]] ) : object

pg_fetch_object() returns an object with properties that correspond to the fetched row's field names. It can optionally instantiate an object of a specific class, and pass parameters to that class's constructor.

Notă: Această funcție stabilește câmpurile NULL la valoarea PHP null.

Speed-wise, the function is identical to pg_fetch_array(), and almost as fast as pg_fetch_row() (the difference is insignificant).

Parametri

result: PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).
row: Row number in result to fetch. Rows are numbered from 0 upwards. If omitted or null, the next row is fetched.
result_type: Ignored and deprecated.
class_name: The name of the class to instantiate, set the properties of and return. If not specified, a stdClass object is returned.
params: An optional array of parameters to pass to the constructor for class_name objects.

Valorile întoarse

An object with one attribute for each field name in the result. Database NULL values are returned as null.

false is returned if row exceeds the number of rows in the set, there are no more rows, or on any other error.

Exemple

Example #1 pg_fetch_object() example


<?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");


while ($data = pg_fetch_object($qu)) {
  echo $data->author . " (";
  echo $data->year . "): ";
  echo $data->title . "<br />";
}

pg_free_result($qu);
pg_close($db_conn);

?>

A se vedea și

pg_query() - Execute a query
pg_fetch_array() - Fetch a row as an array
pg_fetch_assoc() - Fetch a row as an associative array
pg_fetch_row() - Get a row as an enumerated array
pg_fetch_result() - Returns values from a result resource

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User Contributed Notes 8 notes

down

ekevu at yahoo dot com ¶

18 years ago


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.

down

oracle dot shinoda at gmail dot com ¶

20 years ago


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);
}

?>

down

robeddielee at hotmail dot com ¶

19 years ago


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.

down

-1

inbox at bucksvsbytes dot com ¶

23 years ago


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."

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-2

Lars at dybdahl dot dk ¶

22 years ago


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.

down

-2

ian at eiloart dot com ¶

22 years ago


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?

down

-3

qeremy [atta] gmail [dotta] com ¶

13 years ago


Getting db results as object.



<?php

$qry = pg_query("SELECT * FROM users");



$rows = array();

while ($fch = pg_fetch_object($qry)) {

   $rows[] = $fch;

}



// or



$rows = array_map(function($a){

   return (object) $a;

}, (array) pg_fetch_all($qry));

?>

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-3

michiel at minas-2 dot demon dot nl ¶

21 years ago


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");
}

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