Руководство по PHP
Пред. След.

maxdb_rollback

(PECL)

maxdb_rollback

(no version information, might be only in CVS)

maxdb->rollback -- Rolls back current transaction

Description

bool maxdb_rollback ( resource link )

class maxdb {

bool rollback ( void )

}

Rollbacks the current transaction for the database specified by the link parameter.

Return values

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

See also

maxdb_commit() maxdb_autocommit()

Example

Пример 1. Object oriented style

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

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

/* disable autocommit */
$maxdb->autocommit(FALSE);

$maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city");
$maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city");

/* commit insert */
$maxdb->commit();

/* delete all rows */
$maxdb->query("DELETE FROM temp.mycity");

if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
   $row = $result->fetch_row();
   printf("%d rows in table mycity.\n", $row[0]);
   /* Free result */
   $result->close();
}

/* Rollback */
$maxdb->rollback();

if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
   $row = $result->fetch_row();
   printf("%d rows in table mycity (after rollback).\n", $row[0]);
   /* Free result */
   $result->close();
}

/* Drop table myCity */
$maxdb->query("DROP TABLE temp.mycity");

$maxdb->close();
?>

Пример 2. Procedural style

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

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

/* disable autocommit */
maxdb_autocommit($link, FALSE);

maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city");
maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city");

/* commit insert */
maxdb_commit($link);

/* delete all rows */
maxdb_query($link, "DELETE FROM temp.mycity");

if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
   $row = maxdb_fetch_row($result);
   printf("%d rows in table mycity.\n", $row[0]);
   /* Free result */
   maxdb_free_result($result);
}

/* Rollback */
maxdb_rollback($link);

if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
   $row = maxdb_fetch_row($result);
   printf("%d rows in table mycity (after rollback).\n", $row[0]);
   /* Free result */
   maxdb_free_result($result);
}

/* Drop table myCity */
maxdb_query($link, "DROP TABLE temp.mycity");

maxdb_close($link);
?>

The above examples would produce the following output: 

0 rows in table mycity.
25 rows in table mycity (after rollback).
Пред. Начало След.
maxdb_report Уровень выше maxdb_rpl_parse_enabled