pg_fetch_array

(PHP 4, PHP 5)

pg_fetch_array — 데이터베이스의 행을 배열로 가져온다.

함수 설명

array pg_fetch_array ( int $result , int $row [, int $ result_type ] )

이 함수는 데이터베이스에서 가져온 행을 배열로 돌려주며, 만약 더이상 가져올 행이 없는 경우 거짓(FALSE)을 돌려준다.

pg_fetch_array() 함수는 pg_fetch_row() 함수의 확장된 버전으로, 숫자를 인덱스로 하는 배열은 물론이고 각 필드이름을 인덱스로 하는 배열 두가지 형태를 고를 수 있다.

세번째로 정의된 result_type 인수는 선택적으로 주어질 수 있는 상수의 형태로 다음과 같은 값을 취할 수 있다: PGSQL_ASSOC, PGSQL_NUM, 그리고 PGSQL_BOTH.

Note: Result_type 인수는 PHP 4.0 버전부터 추가되었다.

한가지 중요한 사실은 pg_fetch_array() 함수에 pg_fetch_row() 함수보다 요긴하게 사용될 수 있는 기능(siginificant added value)이 추가되었지만 실행속도는 그다지 느리지 않다는 것이다.

pg_fetch_row()도 참고하라.

Example#1 PostgreSQL fetch array


<?php 
$conn = pg_pconnect ("dbname=publisher");
if (!$conn) {
    echo "An error occured.\n";
    exit;
}

$result = pg_Exec ($conn, "SELECT * FROM authors");
if (!$result) {
    echo "An error occured.\n";
    exit;
}

$arr = pg_fetch_array ($result, 0);
echo $arr[0] . " <- array\n";

$arr = pg_fetch_array ($result, 1);
echo $arr["author"] . " <- array\n";
?>

pg_fetch_assoc

pg_fetch_all

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
pg_fetch_array

anonymous
13-May-2005 02:21


Hopefully most people realize this on their own, but the examples below where people tried to get creative with getting numerical or associative (not both) keys in the result are rather pointless. See the pg_fetch_assoc() and pg_fetch_row() for the built in functions that do this automatically. It's generally a better idea to use one of these other functions unless you *need* to access fields by both collumn name *and* index.

Dave O
22-Feb-2005 09:52


I found this out through help from the mailing lists.  If you need to reset the internal counter, use the pg_result_seek, similar to:



pg_result_seek($result, 0)



...plagiarized from the comment on the function's doc page.

devnull
02-Feb-2005 01:59


In response to eth0's comment below about SELECT'ing from two tables where the tables have columns with the same names, you can get around this problem like this:



"SELECT table1.foo AS foo1, table2.foo AS foo2 FROM table1, table2"



In the associative array returned, the keys will be "foo1" and "foo2".

enyo at www.red-link.com
14-Sep-2003 06:55


Just because it is not really clear how to specify the result type, I poste this message.



I wrote a wrapper function which looks like this:



<?php

    function db_fetch_array ($result, $row = NULL, $result_type = PGSQL_ASSOC)

    {

        $return = @pg_fetch_array ($result, $row, $result_type);

        return $return;

    }

?>



I think this way it is quite comfortable to get the arrays you want.

akm at e-nterart dot pl
17-Jun-2003 09:45


(Timesaver) Be aware of the fact that keys in array returned by this function are (well, at least as of 4.2.3) of the same case as SQL column names (e.g. if your column name is ID then key name is also ID, not id or Id), and the keys in associative array are CASE SENSITIVE!!! So don't be surprised if you get unexpected results. Double check SQL column names and the key names.

jesse at sokieserv dot dhs dot org
13-Dec-2001 04:38


As of PHP 4.1.0, you can now use code such as the following to iterate through a result set:





$conn = pg_connect("host=localhost dbname=whatever");


$result = pg_exec($conn, "select * from table");


while ($row = pg_fetch_array($result))


{


     echo "data: ".$row["data"];


}





Can be a nice little time saver, PHP with MySQL has supported this for a while but I'm glad to see it extended to PostgreSQL...

eth0 at fins
28-Sep-2001 11:15


Please remember that if you have for example a table Customers with "cust_ID", "name" and "address" and another table Users with "u_ID","name" and "other" and then you SELECT WHERE cust_ID=u_ID then you'll get in the result array ONLY ONE "name" field, precisely the last one resulted from the select!!!

elliot at nospam dot rightnowtech dot com
22-Jul-2001 09:50


Just remember when you 'or die' to close your table(s) or you may get a confused look from non-internet explorer users.

mkb at ele dot uri dot edu
27-Mar-2001 04:52


The column names if you use PGSQL_ASSOC or PGSQL_BOTH are always in lowercase, no matter what the name is in the database or in the query.

gherson at snet dot net
06-Mar-2001 10:30


In addition to returning "false if there are no more rows", pg_fetch_array will also trigger an E_WARNING.  You can temporarily turn that error reporting level off and suck out all your data like so:





<?php


$errRptLvl = error_reporting(); 


error_reporting($errRptLvl & ~(E_WARNING));


       


list($i,$j)=array(0,0); 


while ($selection[$i++] = $this->fetchArray($j++)); // (fetchArray is a pg_fetch_array wrapper.)


error_reporting($errRptLvl); // Restore error reporting level.


unset($selection[$i-1]); // Delete the last, empty row.


return $selection;


?>

gherson at snet dot net
02-Jan-2001 09:14


PGSQL_BOTH is the default, meaning your array size will be doubled.  


If you specify this field (result type), include no quotes around it or you won't get any data, not even an error.  


Here's my wrapper function:


function SQL_fetch_array($result_ndx, $row, $result_type=PGSQL_ASSOC) { 


   return pg_fetch_array($result_ndx, $row, $result_type);

add a note

pg_fetch_assoc

pg_fetch_all

Last updated: Sun, 25 Nov 2007