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PHP. Руководство по PHP. 2005

maxdb_field_count

Пред.

След.

maxdb_field_count

(PECL)maxdb_field_count

(no version information, might be only in CVS)maxdb->field_count -- Returns the number of columns for the most recent query

Description

Procedural style:int maxdb_field_count (resource link)

Object oriented style (method):class maxdb {


int field_count (void)


}

Returns the number of columns for the most recent query on the connection represented by the link parameter. This function can be useful when using the maxdb_store_result() function to determine if the query should have produced a non-empty result set or not without knowing the nature of the query.

Return values

An integer representing the number of fields in a result set

Example

Пример 1. Object oriented style

<?php

$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

maxdb_report (MAXDB_REPORT_OFF);

$maxdb->query("DROP TABLE friends");

maxdb_report (MAXDB_REPORT_ERROR);

$maxdb->query("CREATE TABLE friends (id int, name varchar(20))");

$maxdb->query("INSERT INTO friends VALUES (1,'Hartmut')");

$maxdb->query("INSERT INTO friends VALUES (2, 'Ulf')");

if ($maxdb->field_count()){

/* this was a select/show or describe query */

$result = $maxdb->store_result();

/* process resultset */

$row = $result->fetch_row();

/* free resultset */

$result->close();

}

/* close connection */

$maxdb->close();

?>

Пример 2. Procedural style

<?php

$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

maxdb_report (MAXDB_REPORT_OFF);

maxdb_query($link,"DROP TABLE friends");

maxdb_report (MAXDB_REPORT_ERROR);

maxdb_query($link, "CREATE TABLE friends (id int, name varchar(20))");

maxdb_query($link, "INSERT INTO friends VALUES (1,'Hartmut')");

maxdb_query($link, "INSERT INTO friends VALUES (2, 'Ulf')");

if (maxdb_field_count($link)){

/* this was a select/show or describe query */

$result = maxdb_store_result($link);

/* process resultset */

$row = maxdb_fetch_row($result);

/* free resultset */

maxdb_free_result($result);

}

/* close connection */

maxdb_close($link);

?>

The above example produces no output.

Пред.

Начало

След.

maxdb_fetch

Уровень выше

maxdb_field_seek

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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