What methods have you used to improve the efficiency of database interactions in your projects?

To improve the efficiency of interacting with the database in Java projects, I used the following methods:

• Caching: implementing cache (e.g., with Ehcache or Redis) to reduce the number of database requests.
• Query optimization: writing efficient SQL queries, using indexes, avoiding redundant JOINs.
• Batch processing: executing multiple insert/update operations in a single request.
• Using ORM with lazy loading: for example, Hibernate with fetch type settings to load data only when necessary.
• Connection pool: using connection pools (HikariCP, C3P0) to reduce connection setup costs.

Example of batch processing with JDBC:

String sql = "INSERT INTO users (name, email) VALUES (?, ?)";
try (Connection conn = dataSource.getConnection();
     PreparedStatement ps = conn.prepareStatement(sql)) {
    conn.setAutoCommit(false);
    for (User user : users) {
        ps.setString(1, user.getName());
        ps.setString(2, user.getEmail());
        ps.addBatch();
    }
    ps.executeBatch();
    conn.commit();
}