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

Inserting Multiple Rows into MySQL with PreparedStatement

Often, there's a need to insert multiple rows into a database at once. While traditional methods involving iterating over each row and executing an insert statement can be inefficient, MySQL offers a syntax that allows inserting multiple rows in a single query:

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

Using PreparedStatements for Batching

To optimize this process using Java and PreparedStatements, consider batching, supported by the PreparedStatement class. By creating a batch with addBatch(), you can execute it as a group using executeBatch().

Code Example

The following example demonstrates how to batch insertions:

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();
            }
        }
    }
}

Batch Execution Optimization

Batching is executed every 1000 items to avoid potential limitations of JDBC drivers or databases.

Additional Resources

• [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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