pg_num_fields

(PHP 4 >= 4.2.0, PHP 5)

pg_num_fieldsReturns the number of fields in a result

Descripción

int pg_num_fields ( resource $result )

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

Nota:

This function used to be called pg_numfields().

Parámetros

result

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

Valores devueltos

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

Ejemplos

Ejemplo #1 pg_num_fields() example

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

$num pg_num_fields($result);

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

El resultado del ejemplo sería:

2 field(s) returned.

Ver también

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User Contributed Notes 1 note

up
-1
mark at redbrick dot dcu dot ie
11 years ago
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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