How Can I Use PDO for Parameterized SELECT and INSERT Queries in PHP?

PDO for Parameterized SELECT Queries

Query Execution

To execute a parameterized SELECT query using PDO, follow these steps:

1. Create a PDO object: $db = new PDO("...");
2. Prepare a query statement: $statement = $db->prepare("select id from some_table where name = :name");
3. Execute the statement: $statement->execute(array(':name' => "Jimbo"));
4. Retrieve the result: $row = $statement->fetch();

Data Insertion

Once you have the ID from the SELECT query, you can use it to insert data into another table:

1. Prepare an insert statement: $statement = $db->prepare("insert into some_other_table (some_id) values (:some_id)");
2. Execute the statement: $statement->execute(array(':some_id' => $row['id']));

Error Handling

To simplify error handling, you can configure PDO to throw exceptions upon errors:

$db = new PDO("...");
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

This way, any query that fails will raise a PDOException, allowing you to handle errors efficiently.

Prepared Queries

Prepared queries can be useful if you need to execute the same query multiple times with different parameters. Instead of re-preparing the statement each time, you can prepare it once and then execute it multiple times using different parameter values. This can improve performance if the query is complex or frequently executed.

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