How Can I Efficiently Insert Multiple Rows into MySQL Using PreparedStatements?

Insert Multiple MySQL Rows with PreparedStatement

To optimize row insertion into a MySQL table, you can leverage the supported syntax:

INSERT INTO table (col1, col2) VALUES ('val1', 'val2'), ('val1', 'val2')[, ...]

However, if the number of rows to be inserted dynamically, using a PreparedStatement can be challenging.

Using a PreparedStatement with AddBatch

To insert multiple rows dynamically using a PreparedStatement, you can create a batch using the addBatch() method and execute it with executeBatch().

Here's an example:

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.
            }
        }
    }
}

This approach executes the batch every 1000 items, considering limitations in JDBC drivers or database batch length.

Alternative Methods

If using a PreparedStatement with batching is not feasible, alternative methods for inserting multiple rows include:

• Using the insert() method of a PreparedStatement for each row, with potential performance limitations.
• Using a Statement object, which allows execution of multiple SQL statements at once.

References:

• [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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