pg_query

(PHP 4 >= 4.2.0, PHP 5)

pg_queryИзпълнява заявка

Описание

resource pg_query ( string $query )
resource pg_query ( resource $connection , string $query )

pg_query() изпълнява query на посочения connection към база от данни.

В случай, че настъпи грешка и се върне FALSE, подробности за грешката могат да бъдат получени посредством функцията pg_last_error(), ако връзката е валидна.

Забележка: Въпреки че connection може да бъде пропуснат, това не е препоръчително, тъй като може да доведе до трудни за намиране дефекти в скриптовете.

Забележка: Старото име на тази функция е pg_exec(). pg_exec() все още е налична с цел съвместимост, но потребителите се насърчават да използват новото име.

Параметри

connection

Ресурс на връзката към базата от данни в PostgreSQL. Когато connection не е наличен, се използва връзката по подразбиране - последната връзка, отворена от pg_connect() или pg_pconnect().

query

SQL израз или изрази, които да бъдат изпълнени. Когато към функцията се подадат множество изрази, те автоматично се изпълняват като една транзакция, освен ако няма изрични команди BEGIN/COMMIT, включени в заявката. Използването на множество транзакции в едно извикване на функцията, обаче, не е препоръчително.

Връщани стойности

Резултатен ресурс от заявката, при успех, или FALSE - при неуспех.

Примери

Example #1 Пример за pg_query()

<?php

$conn 
pg_pconnect("dbname=publisher");
if (!
$conn) {
  echo 
"Възникна грешка.\n";
  exit;
}

$result pg_query($conn"SELECT author, email FROM authors");
if (!
$result) {
  echo 
"Възникна грешка.\n";
  exit;
}

while (
$row pg_fetch_row($result)) {
  echo 
"Автор: $row[0]  E-mail: $row[1]";
  echo 
"<br />\n";
}
 
?>

Example #2 Употреба на pg_query() с множество изрази

<?php

$conn 
pg_pconnect("dbname=publisher");

// тези изрази ще бъдат изпълнени като една транзакция

$query "UPDATE authors SET author=UPPER(author) WHERE id=1;";
$query .= "UPDATE authors SET author=LOWER(author) WHERE id=2;";
$query .= "UPDATE authors SET author=NULL WHERE id=3;";

pg_query($conn$query);

?>

Вж. също

add a note add a note

User Contributed Notes 15 notes

up
3
hierophantNOSPAM at pcisys dot net
12 years ago
Regarding david.bouriaud@ac-rouen.fr:
You misunderstand SQL. When a query is issued, results applicable at the time of the query are returned to the application (i.e. PHP). There is no further reference to the database required. Thus, all of the pg_fetch_* functions are acting on an internal data storage, NOT the database itself. This is because SQL does not have a concept of sets, or of state (except in limited circumstances provided by transactions). However, if you use a cursor instead, fetching only one record at a time, you may get an error if you delete the table. If you don't, it is an issue with Postgres, not PHP.
up
2
zoli at makettinfo.hu
8 years ago
It would be better this way:

<?php
  $result
=pg_query($conn, "SELECT COUNT(*) AS rows FROM x WHERE a=b;");
  if  (!
$result) {
   echo
"query did not execute";
  }
  if (
$line = pg_fetch_assoc($result)) {
    if (
$line['rows'] == 0) {
     echo
"0 records"
   
}
  }
  else {
   while (
$row = pg_fetch_array($result)) {
    
//do stuff with $row
  
}
  }
?>

This solution doesn't raise the load of the system with the move of matching rows (perhaps 0,1, perhaps 100, 1000, ... rows)
up
1
a dot mcruer at live dot com
1 year ago
A quick note for novice users: when gathering input from fields on a web form that maintains a database connection, *never* use pg_query to do queries from the field. Always sanitize input using pg_prepare and pg_execute.
up
1
mankyd
8 years ago
Improving upon what jsuzuki said:

It's probably better to use pg_num_rows() to see if no rows were returned, as that leaves the resultset cursor pointed to the first row so you can use it in a loop.

Example:

<?php
  $result
=pg_query($conn, "SELECT * FROM x WHERE a=b;");
  if  (!
$result) {
   echo
"query did not execute";
  }
  if (
pg_num_rows($result) == 0) {
   echo
"0 records"
 
}
  else {
    while (
$row = pg_fetch_array($result) {
     
//do stuff with $row
   
}
  }
?>

I, personally, also find it more readable.
up
1
Akbar
9 years ago
Use pg_query to call your stored procedures, and use pg_fetch_result when getting a value (like a smallint as in this example) returned by your stored procedure.

<?php
$pgConnection
= pg_connect("dbname=users user=me");

$userNameToCheckFor = "metal";

$result = pg_query($pgConnection, "SELECT howManyUsersHaveThisName('$userNameToCheckFor')");

$count = pg_fetch_result($result, 0, 'howManyUsersHaveThisName');
?>
up
2
Jan-Willem Regeer
9 years ago
In reply to david dot bouriaud at ac-rouen dot fr:

All it is doing is internal caching. How can that be dangerous. If you are going to be deleting records after you have closed the connection it is your problem to make sure you have the latest and greatest records, and not some cached ones. Considering you are writing the script I don't see why it is a problem, you know what you are doing in the script, so it is quite useless for PHP to invalidate the cache, when that could be done upon exiting the script, which would mean there was less time spent cleaning out the cache when it counts most (when returning data to the user).
up
2
cmoore
9 years ago
One thing to note that wasn't obvious to me at first.  If your query returns zero rows, that is not a "failed" query.  So the following is wrong:
  $result=pg_query($conn, "SELECT * FROM x WHERE a=b;");
  if  (!$result) {
    echo "No a=b in x\n";
  }

pg_query returns FALSE if the query can not be executed for some reason.  If the query is executed but returns zero rows then you get back a resul with no rows.
up
2
jvarner at dsrglobal dot com
12 years ago
That's why your code should never assume it has the very latest data unless it locks it.
up
1
mankyd
8 years ago
There was a typo in the code that I posted:

<?php
  $result
=pg_query($conn, "SELECT * FROM x WHERE a=b;");
  if  (!
$result) {
   echo
"query did not execute";
  }
  if (
pg_num_rows($result) == 0) {
   echo
"0 records"
 
}
  else {
   while (
$row = pg_fetch_array($result)) {
    
//do stuff with $row
  
}
  }
?>
up
0
Anonymous
11 months ago
Here is my small function to make it easier for me to use data from select queries (attention, it is sensitive to sql injection)
<?php
function requestToDB($connection,$request){
    if(!
$result=pg_query($connection,$request)){
        return
False;
    }
   
$combined=array();
    while (
$row = pg_fetch_assoc($result)) {
       
$combined[]=$row;
    }
    return
$combined;
}
?>

Example:
<?php
$conn
= pg_pconnect("dbname=mydatabase");

$results=requestToDB($connect,"select * from mytable");

//You can now access a "cell" of your table like this:
$rownumber=0;
$columname="mycolumn";

$mycell=$results[$rownumber][$columname];
var_dump($mycell);
up
0
sd at dicksonlife dot com
8 years ago
Took me a while to track this down so I thought it might be useful for others:

If you use stored procedures and need to get result sets back from them:

function dbquery($link,$query){
  pg_query($link,"BEGIN;");
  $tr=pg_query($link,$query);
  $r=pg_fetch_row($tr);
  $name=$r[0];
  $rs=pg_query($link,"FETCH ALL IN \"" . $name . "\";");
  pg_query($link,"END;");
  return $rs;
}

(Error checking removed for clarity)
up
0
jsuzuki at spamcop dot net
8 years ago
expanding on the note left by "cmoore" -

To check to see if the recordset returned no records,

<?php
  $result
=pg_query($conn, "SELECT * FROM x WHERE a=b;");
  if  (!
$result) {
    echo
"query did not execute";
  }
 
$rs = pg_fetch_assoc($result);
  if (!
$rs) {
    echo
"0 records"
 
}
?>

-jack
up
0
yoshinariatsuo at yahoo dot com
11 years ago
create table from pg_query results.. hope it helps newbies...
function table_create($result)
{
    $numrows = pg_num_rows($result);
    $fnum = pg_num_fields($result);

    echo "<table border width='100%'>";
    echo "<tr>";

    for ($x = 0; $x < $fnum; $x++) {
        echo "<td><b>";
        echo strtoupper(pg_field_name($result, $x));
        echo "</b></td>";
    }

    echo "</tr>";

    for ($i = 0; $i < $numrows; $i++) {
        $row = pg_fetch_object($result, $i);
        echo "<tr align='center'>";
        for ($x = 0; $x < $fnum; $x++) {
    $fieldname = pg_field_name($result, $x);
    echo "<td>";
    echo $row->$fieldname;
    echo "</td>";
        }
        echo"</tr>";
    }
    echo "</table>";
   
    return 0;
}
up
0
mentat at azsoft dot pl
12 years ago
$GLOBALS["PG_CONNECT"]=pg_connect(...);
....

function query ($sqlQuery,$var=0) {
   if (!$GLOBALS["PG_CONNECT"]) return 0;
   $lev=error_reporting (8); //NO WARRING!!
   $result=pg_query ($sqlQuery);
   error_reporting ($lev); //DEFAULT!!
   if (strlen ($r=pg_last_error ($GLOBALS["PG_CONNECT"]))) {
      if ($var) {
        echo "<p color=\"red\">ERROR:<pre>";
        echo $sqlQuery;
        echo "</pre>";
        echo $r;
        echo "&lt/p>";
      }
      close_db ();
      return 0;
   }
   return $result;
}
up
0
david dot bouriaud at ac-rouen dot fr
12 years ago
Hi to all !
It seems that the old pg_exec function does not do what it is expected to.
In the doc, it is said that it returns a resource identifier on the successful querry that was send to the backend.
It seems to me that it is more than a resource identifier.
Follow the example :

<?php
$ConnId
= pg_connect ("blablabla");
$ResId = pg_exec ("select * from table", $ConnId);
pg_close ($ConnId);
$row = pg_fetch_array ($ResId, 4);
?>

I closed the connection voluntarily before the pg_fetch_array. It WORKS !

Now, imagine the following script :
<?php
$ConnId
= pg_connect ("blablabla");
$ResId = pg_exec ("select * from table", $ConnId);
pg_close ($ConnId);
system ("psql base -c delete from table");
$row = pg_fetch_array ($ResId, 4);
?>
See how it could be harmful !!!! I think that the coders have done this for performances reasons, but it is not the right way do do so !!!
To Top