pg_query

(PHP 4 >= 4.2.0, PHP 5)

pg_query -- Execute a query

Описание

resource pg_query ( string query )

resource pg_query ( resource connection, string query )

pg_query() executes the query on the specified database connection.

If an error occurs, and FALSE is returned, details of the error can be retrieved using the pg_last_error() function if the connection is valid.

Замечание: Although connection can be omitted, it is not recommended, since it can be the cause of hard to find bugs in scripts.

Замечание: This function used to be called pg_exec(). pg_exec() is still available for compatibility reasons, but users are encouraged to use the newer name.

Список параметров

connection

PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

query

The SQL statement or statements to be executed. When multiple statements are passed to the function, they are automatically executed as one transaction, unless there are explicit BEGIN/COMMIT commands included in the query string. However, using multiple transactions in one function call is not recommended.

Возвращаемые значения

A query result resource on success, or FALSE on failure.

Примеры

Пример 1. pg_query() example

<?php

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

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

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

Пример 2. Using pg_query() with multiple statements

<?php

$conn = pg_pconnect("dbname=publisher");

// these statements will be executed as one transaction

$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);

?>

Смотрите также

pg_connect()
pg_pconnect()
pg_fetch_array()
pg_fetch_object()
pg_num_rows()
pg_affected_rows()



pg_query
zoli at makettinfo.hu
21-May-2006 08:07
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)
mankyd
13-May-2006 07:21
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
   }
  }
?>
mankyd
12-May-2006 06:56
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.
jsuzuki at spamcop dot net
27-Nov-2005 05:58
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
Jan-Willem Regeer
27-Sep-2005 04:58
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).
cmoore
05-Sep-2005 11:20
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.
Akbar
01-Dec-2004 08:07
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');
?>
yoshinariatsuo at yahoo dot com
22-Apr-2003 11:59
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;
}
mentat at azsoft dot pl
14-Oct-2002 05:16
$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;
}
hierophantNOSPAM at pcisys dot net
17-Jun-2002 12:50
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.
jvarner at dsrglobal dot com
10-May-2002 03:18
That's why your code should never assume it has the very latest data unless it locks it.
david dot bouriaud at ac-rouen dot fr
07-May-2002 10:54
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 !!!

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 Last updated: Tue, 15 Nov 2005