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How Can I Efficiently Use PDO for Parameterized SELECT Queries and Subsequent Data Insertion?
How Can I Efficiently Use PDO for Parameterized SELECT Queries and Subsequent Data Insertion?
Nov 21, 2024 am 11:04 AM
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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