How to solve the problem that php cannot call commit

The solution to PHP's inability to call commit is: 1. Make sure that the PDO transaction "try {$pdo->beginTransaction();}", "$pdo->commit();" is normally opened. ; 2. Check whether there are database table or connection problems; 3. Use a storage engine that supports transactions. In MySQL, only InnoDB and NDB storage engines support transactions.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

Calling `commit()` when using PHP cannot take effect, usually because the transaction management mechanism is not used correctly.

Solution:

1. Make sure you have opened the PDO transaction.

```
try {
    $pdo->beginTransaction();
    // your database operations
} catch (PDOException $e) {
    $pdo->rollback();
    throw $e;
}
$pdo->commit();
```

2. Check if there are database table or connection issues

3. Make sure you are using a storage engine that supports transactions. In MySQL, only InnoDB and NDB storage engines support transactions.

Impact:

If the call to `commit()` is invalid, it will prevent the transaction from committing, which means that all changes to the database will be rolled back, resulting in the wrong result. At the same time, you cannot guarantee data consistency and lose the benefits provided by the transaction isolation level.

Sample code:

The following sample code demonstrates how to correctly enable PDO transactions and commit changes using `commit()`:

```
<?php
try {
    $dbh = new PDO(&#39;mysql:host=localhost;dbname=test&#39;, &#39;username&#39;, &#39;password&#39;);
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $dbh->beginTransaction();
    $sth = $dbh->prepare(&#39;UPDATE users SET email = :email WHERE id = :id&#39;);
    $sth->bindParam(&#39;:id&#39;, $id);
    $sth->bindParam(&#39;:email&#39;, $email);
    $id = 1;
    $email = &#39;test@example.com&#39;;
    $sth->execute();
    $id = 2;
    $email = &#39;test2@example.com&#39;;
    $sth->execute();
    $dbh->commit();
} catch (PDOException $e) {
    $dbh->rollback();
    echo &#39;Error: &#39; . $e->getMessage();
}
```

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