Remember that MyISAM tables do not support rollbacks.
I just drove myself crazy for an afternoon trying to figure out what was wrong with my code - meanwhile it was fine all along
mysqli::rollback
mysqli_rollback
(PHP 5, PHP 7, PHP 8)
mysqli::rollback -- mysqli_rollback — Reverte a transação atual
Descrição
Estilo orientado a objetos
Estilo procedural
Reverte a transação atual para o banco de dados.
Parâmetros
-
mysql -
Somente no estilo procedural: Um objeto mysqli retornado por mysqli_connect() ou mysqli_init()
-
flags -
Uma máscara de bits das constantes
MYSQLI_TRANS_COR_*. -
name -
Se fornecido, então
ROLLBACK/*name*/é executado.
Valor Retornado
Retorna true em caso de sucesso ou false em caso de falha.
Erros/Exceções
Se o relatório de erros da extensão mysqli estiver habilitado (MYSQLI_REPORT_ERROR) e a operação solicitada falhar,
um aviso será gerado. Se, além disso, o modo for definido como MYSQLI_REPORT_STRICT,
uma exceção mysqli_sql_exception será lançada em vez do aviso.
Registro de Alterações
| Versão | Descrição |
|---|---|
| 8.0.0 |
name agora é anulável.
|
Notas
Nota:
Esta função não funciona com tipos de tabelas não transacionais (como MyISAM ou ISAM).
Veja Também
- mysqli_begin_transaction() - Inicia uma transação
- mysqli_commit() - Grava a transação atual
- mysqli_autocommit() - Ativa ou desativa a gravação automática das modificações no banco de dados
- mysqli_release_savepoint() - Remove o ponto de salvamento nomeado do conjunto de pontos de salvamento da transação atual
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User Contributed Notes 5 notes
Steven McCoy ¶
12 years ago
Lorenzo - webmaster AT 4tour DOT it ¶
15 years ago
This is an example to explain the powerful of the rollback and commit functions.
Let's suppose you want to be sure that all queries have to be executed without errors before writing data on the database.
Here's the code:
<?php
$all_query_ok=true; // our control variable
//we make 4 inserts, the last one generates an error
//if at least one query returns an error we change our control variable
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (200)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (300)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false; //duplicated PRIMARY KEY VALUE
//now let's test our control variable
$all_query_ok ? $mysqli->commit() : $mysqli->rollback();
$mysqli->close();
?>
hope to be helpful!
xcalibur at xcalibur dot dk ¶
14 years ago
Just a note about auto incremental ids and rollback.
When using transactions and inserting into a table containing a column with auto incremental ids, the id will be incremented even though the transaction is rolled back.
This might occupy a lot of ids if a lot of rollbacks are performed.
Example:
<?php
$mysqli = new mysqli("localhost", "gugbageri", "gugbageri", "gugbageri");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* disable autocommit */
$mysqli->autocommit(FALSE);
/* We just create a test table with one auto incremental primary column and a content column*/
$mysqli->query("CREATE TABLE TestTable ( `id_column` INT NOT NULL AUTO_INCREMENT , `content` INT NOT NULL , PRIMARY KEY ( `id_column` )) ENGINE = InnoDB;");
/* commit newly created table */
$mysqli->commit();
/* we insert a row */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
/* we commit the inserted row */
$mysqli->commit();
/* we insert another three rows */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
/* we the rollback */
$mysqli->rollback();
/* we insert a row */
$mysqli->query("INSERT INTO TestTable (content) VALUES (99)");
/* we commit the inserted row */
$mysqli->commit();
if ($result = $mysqli->query("SELECT id_column FROM TestTable")) {
while($row = $result->fetch_row()) {
printf("Id: %d.\n", $row[0]);
}
/* Free result */
$result->close();
}
/* Drop table TestTable */
$mysqli->query("DROP TABLE TestTable");
$mysqli->close();
?>
This will output:
Id: 1.
Id: 5.
Yorick Phoenix ¶
1 year ago
If you use savepoints - eg savepoint($foo) - be wary of trying to rollback to the save point with rollback(0, $foo) as that executes "ROLLBACK /* $foo */" instead of "ROLLBACK TO `$foo`".
The manual page is clear about this, but is easily overlooked.
Instead use: $mysqli->query("ROLLBACK TO `$foo`");
jd at dilltree dot com ¶
15 years ago
Something to consider when using transact is that you should not perform a normal query on the same table (such as a DELETE) immediately after a transaction. If the transaction rolls-back, the DELETE will execute and even show affected rows, but the row can be magically re-inserted even if the rollback() command comes before the DELETE query.
