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mysqli_rollback (PHP 5 CVS only) mysqli_rollback (no version information, might be only in CVS) mysqli->rollback -- Rolls back current transaction Descriptionbool mysqli_rollback ( object link) class mysqli { bool rollback ( void ) }
Rollbacks the current transaction for the database specified by the
link parameter.
Return values
如果成功则返回 TRUE,失败则返回 FALSE。
Example例子 1. Object oriented style
<?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); }
/* disable autocommit */ $mysqli->autocommit(FALSE);
$mysqli->query("CREATE TABLE myCity LIKE City"); $mysqli->query("ALTER TABLE myCity Type=InnoDB"); $mysqli->query("INSERT INTO myCity SELECT * FROM City LIMIT 50");
/* commit insert */ $mysqli->commit();
/* delete all rows */ $mysqli->query("DELETE FROM myCity");
if ($result = $mysqli->query("SELECT COUNT(*) FROM myCity")) { $row = $result->fetch_row(); printf("%d rows in table myCity.\n", $row[0]); /* Free result */ $result->close(); }
/* Rollback */ $mysqli->rollback();
if ($result = $mysqli->query("SELECT COUNT(*) FROM myCity")) { $row = $result->fetch_row(); printf("%d rows in table myCity (after rollback).\n", $row[0]); /* Free result */ $result->close(); }
/* Drop table myCity */ $mysqli->query("DROP TABLE myCity");
$mysqli->close(); ?>
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例子 2. Procedural style
<?php $link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); }
/* disable autocommit */ mysqli_autocommit($link, FALSE);
mysqli_query($link, "CREATE TABLE myCity LIKE City"); mysqli_query($link, "ALTER TABLE myCity Type=InnoDB"); mysqli_query($link, "INSERT INTO myCity SELECT * FROM City LIMIT 50");
/* commit insert */ mysqli_commit($link);
/* delete all rows */ mysqli_query($link, "DELETE FROM myCity");
if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) { $row = mysqli_fetch_row($result); printf("%d rows in table myCity.\n", $row[0]); /* Free result */ mysqli_free_result($result); }
/* Rollback */ mysqli_rollback($link);
if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) { $row = mysqli_fetch_row($result); printf("%d rows in table myCity (after rollback).\n", $row[0]); /* Free result */ mysqli_free_result($result); }
/* Drop table myCity */ mysqli_query($link, "DROP TABLE myCity");
mysqli_close($link); ?>
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The above examples would produce the following output:
0 rows in table myCity.
50 rows in table myCity (after rollback). |
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