How Can I Optimize Multiple Row Insertions in MySQL Using Java\'s PreparedStatement?

Optimizing Multiple Row Insertion in MySQL with Java Using PreparedStatement

In database programming, inserting multiple rows into a table efficiently is crucial for performance. This article addresses how to optimize multiple row insertion in MySQL using Java's PreparedStatement.

Background

Previously, a simple loop was used to insert rows one at a time, which could be inefficient. To improve performance, we aim to utilize MySQL's supported syntax that allows inserting multiple rows in a single statement.

Using PreparedStatement Batching

MySQL offers batching as a way to execute multiple statements as a group. With PreparedStatement, we can achieve this by adding individual row data to a batch using the addBatch() method. Once the batch is complete or reaches a specific size limit, we can execute the entire batch using executeBatch().

Below is an example of batching with PreparedStatement:

public void save(List<Entity> entities) throws SQLException {
    try (
        Connection connection = database.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL_INSERT);
    ) {
        int i = 0;

        for (Entity entity : entities) {
            statement.setString(1, entity.getSomeProperty());
            // ...

            statement.addBatch();
            i++;

            if (i % 1000 == 0 || i == entities.size()) {
                statement.executeBatch(); // Execute every 1000 items.
            }
        }
    }
}

Batching improves performance by reducing round trips to the database and enabling the server to execute multiple statements efficiently.

Additional Resources

For further information on JDBC batching:

• [JDBC tutorial - Using PreparedStatement](https://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html)
• [JDBC tutorial - Using Statement Objects for Batch Updates](https://docs.oracle.com/javase/tutorial/jdbc/basics/batchupdates.html)

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