Java Remove repeated try, catch, finally boilerplate from DAO

Question

I have a DAO class with many methods that have a lot of repeated code along the lines of: -

public void method1(...) {
  Connection conn = null;
  try {
             


        

Answer 1

I think what you should use is Spring-JDBC's JdbcTemplate

Even if you don't use spring to manage your application, you could programmatically use JdbcTemplate to abstract away all the connection management and error handling.

Example code:

List actors = this.jdbcTemplate.query(
        "select first_name, last_name from t_actor",
        new RowMapper() {
            public Actor mapRow(ResultSet rs, int rowNum)
            throws SQLException {
                Actor actor = new Actor();
                actor.setFirstName(rs.getString("first_name"));
                actor.setLastName(rs.getString("last_name"));
                return actor;
            }
        });

As you can see, you deal with the actual query only, not with the infrastructure stuff around it.