How does ResultSet behave in multithreaded code?

In JDBC, a ResultSet object is used to represent the result set of a query. However, when using ResultSet in a multithreaded environment, you need to be cautious as it is not thread-safe. This means that if multiple threads try to manipulate the same ResultSet object simultaneously, it can lead to unpredictable behavior or even data corruption.

To safely use ResultSet in a multithreaded context, it’s recommended to ensure that each thread works with its own ResultSet instance or to synchronize access to a shared ResultSet using proper synchronization techniques.

Here's an example that demonstrates how to handle ResultSet in a single-threaded manner:

<?php // Example of ResultSet usage in a single thread $conn = new mysqli("localhost", "username", "password", "database"); if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } $sql = "SELECT id, name FROM Users"; $result = $conn->query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>"; } } else { echo "0 results"; } $conn->close(); ?>

ResultSet JDBC multithreading thread-safe database connections

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