How to Retrieve a Table ID via Parameterized SELECT and Use It for an INSERT with PDO?

PDO: Parameterized SELECT Query for Table ID Retrieval

In this scenario, we seek to retrieve the ID from a table based on a name parameter and determine the success of an INSERT operation using that ID.

To accomplish this using a parameterized SELECT query with PDO, follow these steps:

1. Initialize a new PDO object:

$db = new PDO("...");

2. Prepare the SELECT query:

$statement = $db->prepare("SELECT id FROM some_table WHERE name = :name");

3. Execute the statement with the name parameter:

$statement->execute([':name' => "Jimbo"]);

4. Obtain the ID from the result:

$row = $statement->fetch();
$id = $row['id'];

5. Prepare the INSERT query:

$statement = $db->prepare("INSERT INTO some_other_table (some_id) VALUES (:some_id)");

6. Execute the INSERT statement with the retrieved ID:

$statement->execute([':some_id' => $id]);

7. To ensure proper error handling, set PDO to throw exceptions:

$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

By following these steps, you can efficiently perform a parameterized SELECT query and use the retrieved ID for a subsequent INSERT operation in another table.

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