How Can I Efficiently Use PDO for Parameterized SELECT Queries and Subsequent Data Insertion?

Proper Utilization of PDO Objects for Parameterized SELECT Queries

Retrieving a Unique ID Using Parameterized SELECT

To retrieve a unique ID from a table using a parameterized SELECT query, follow these steps:

$db = new PDO("...");
$statement = $db->prepare("SELECT id FROM some_table WHERE name = :name");
$statement->execute([':name' => "Jimbo"]);
$row = $statement->fetch();

The $row variable will now contain an array with the ID.

Inserting Data Using the Retrieved ID

To insert data into another table using the retrieved ID, use the following code:

$statement = $db->prepare("INSERT INTO some_other_table (some_id) VALUES (:some_id)");
$statement->execute([':some_id' => $row['id']]);

Error Handling with PDO Exceptions

For seamless error handling, configure PDO to throw exceptions upon errors:

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

Reusability of Prepared Statements

Preparing statements improves query performance. Instead of parsing and compiling the query every time it is executed, the prepared statement is re-run with the new parameters.

Example:

Consider a scenario where the same query is executed multiple times with different parameters. Without preparing the statement, the query would be parsed and compiled every time, leading to reduced efficiency. By preparing the statement once, its execution is faster when the parameters change because only the parameters are replaced.

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