How to Update Specific Rows in a MySQL Database Using PDO?

Update Query with PDO and MySQL

Updating data in a MySQL database using PHP Data Objects (PDO) can present challenges if not executed correctly. Encountering issues with query execution is common, and understanding the errors is crucial.

One common issue is an incorrect UPDATE syntax. The provided code attempts to update all rows in the access_users table, which is not the intended behavior for an update operation. To target a specific row, a WHERE clause must be used.

The correct syntax for the UPDATE query is:

<code class="sql">UPDATE `access_users`
SET `contact_first_name` = :firstname,
    `contact_surname` = :surname,
    `contact_email` = :email,
    `telephone` = :telephone
WHERE `user_id` = :user_id</code>

Here, the WHERE clause identifies the row to update based on the user_id field. The parameters (:firstname, :surname, :email, :telephone, :user_id) are then used to provide the updated values.

To ensure successful execution, the following steps are recommended:

1. Use the correct UPDATE syntax.
2. Specify the row to update using the WHERE clause.
3. Bind the parameters using the PDO prepare() and bindValue() methods.
4. Execute the query using the statement->execute() method.

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