pg_num_fields

(PHP 4 >= 4.2.0, PHP 5)

pg_num_fields -- Returns the number of fields in a result

Описание

int pg_num_fields ( resource result )

pg_num_fields() returns the number of fields (columns) in a PostgreSQL result resource.

Замечание: This function used to be called pg_numfields().

Список параметров

result

PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

Возвращаемые значения

The number of fields (columns) in the result. On error, -1 is returned.

Примеры

Пример 1. pg_num_fields() example

<?php
$result = pg_query($conn, "SELECT 1, 2");

$num = pg_num_fields($result);

echo $num . " field(s) returned.\n";
?>

Результат выполнения данного примера:

2 field(s) returned.

Смотрите также

pg_num_rows()
pg_affected_rows()



pg_num_fields
mark at redbrick dot dcu dot ie
24-Mar-2003 01:02
Here is a simple example for using pg_num_feilds, pg_num_rows and pg_result together.  I'm simply SELECTing * from a table named markie on the current pg_connect(). 

<?php
   $pgsql_conn = pg_connect("dbname=mark host=localhost");

   if (!$pgsql_conn) {
       print pg_last_error($pgsql_conn);
       exit;
   }

   $results = pg_query($pgsql_conn, "SELECT * FROM markie");

   echo "<table border=1>\n";
   for($lt = 0; $lt < pg_num_rows($results); $lt++) {
       echo "<tr>\n";
       for($gt = 0; $gt < pg_num_fields($results); $gt++) {
           echo "<td>" . pg_result($results, $lt, $gt) . "</td>\n";
       }
       echo "</tr>\n";
   }
   echo "</table>\n";

   pg_close($pgsql_conn);
?>

This code snippet will print out the rows and columns into a HTML table.

Regards,  --mark

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 Last updated: Tue, 15 Nov 2005