How Can PreparedStatement Improve Multi-Row Inserts in MySQL?

Optimizing Multi-Row Inserts with PreparedStatement

Initially, inserting rows into a MySQL table using a loop and individual PreparedStatment calls was a common practice. However, to enhance performance, utilizing the MySQL-supported syntax for multi-row insertions is desirable.

Batching with PreparedStatement

A PreparedStatement offers a solution for optimized multi-row inserts through batching. By employing the PreparedStatement#addBatch() method, multiple SQL statements are accumulated in a batch. These statements are then executed simultaneously via PreparedStatement#executeBatch().

The following sample code demonstrates this approach:

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.
            }
        }
    }
}

Additional Resources

For further details on this technique, refer to the following resources:

• JDBC tutorial - Using PreparedStatement
• JDBC tutorial - Using Statement Objects for Batch Updates

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