jdbi return autogenerated value on inserts

Question

I am playing with dropwizard and I want to build a REST application that has various foreign-key relations in the entities.

For example given the following 3 tables:

-- table persons CREATE TABLE PUBLIC.PERSONS(     ID BIGINT DEFAULT NOT NULL AUTOINCREMENT,     FIRST_NAME VARCHAR(255),     LAST_NAME VARCHAR(255),     BIRTHDAY DATE,     ADDRESS_ID BIGINT NOT NULL,     CREATED TIMESTAMP DEFAULT 'current_timestamp',     MODIFIED TIMESTAMP ); ALTER TABLE PUBLIC.PERSONS ADD CONSTRAINT PUBLIC.PK_PERSONS PRIMARY KEY(ID);  -- table customers CREATE TABLE PUBLIC.CUSTOMERS(     ID BIGINT DEFAULT NOT NULL AUTOINCREMENT,     PERSON_ID BIGINT NOT NULL,     STATUS_CODE VARCHAR(100) DEFAULT 'ACQUISITION' NOT NULL,     CREATED TIMESTAMP DEFAULT 'current_timestamp',     MODIFIED TIMESTAMP ); ALTER TABLE PUBLIC.CUSTOMERS ADD CONSTRAINT PUBLIC.PK_CUSTOMERS PRIMARY KEY(ID);  -- table addresses CREATE TABLE PUBLIC.ADDRESSES(     ID BIGINT DEFAULT NOT NULL AUTOINCREMENT,     LINE_1 VARCHAR(255),     LINE_2 VARCHAR(255),     ZIP VARCHAR(255),     CITY VARCHAR(255),     COUNTRY_CODE VARCHAR(3),     PHONE VARCHAR(255),     FAX VARCHAR(255),     CREATED TIMESTAMP DEFAULT 'current_timestamp',     MODIFIED TIMESTAMP ); ALTER TABLE PUBLIC.ADDRESSES ADD CONSTRAINT PUBLIC.PK_ADDRESSES PRIMARY KEY(ID);  -- and following forign key constraints: ALTER TABLE PUBLIC.PERSONS ADD CONSTRAINT      PUBLIC.FK_PERSON_ADDRESS FOREIGN KEY(ADDRESS_ID)      REFERENCES PUBLIC.ADDRESSES(ID) ON DELETE SET NULL NOCHECK;  ALTER TABLE PUBLIC.CUSTOMERS ADD CONSTRAINT      PUBLIC.FK_CUSTOMER_PERSON FOREIGN KEY(PERSON_ID)      REFERENCES PUBLIC.PERSONS(ID) ON DELETE SET NULL NOCHECK; 

I have started to implement a customerDAO that reads the data of the customer table an dthe referenced tables with one SQL query, that was not very complicated:

@RegisterMapper(CustomerResultMapper.class) public interface CustomerDAO {      @SqlQuery("select p.id as person_id, "             + "p.first_name, p.last_name, p.birthday, "             + "c.id as customer_id, c.status_code, "             + "a.id as address_id, a.line_1, a.line_2, a.zip, "             + "a.city, a.country_code, a.phone, a.fax "             + "from customers c, persons p, addresses a "             + "where c.id = :id "             + "and c.person_id = p.id "             + "and p.address_id = a.id")     public Customer findCustomerById(@Bind("id") long id); } 

(For the sake of brevity, I skip the mapper, since that is not my actual question)

Now I want to insert a new customer, I have all the required data, including the data which belongs in the referenced tables.

I could not find a way how to execute multiple queries with jdbi annotations, so I figured, I have to create a DAO method for every one of the tables and insert the data from within java, updating the foreign key references manually.

But also this does not work because I could not find a way to read the autogenerated ID value after an insert.

Any idea how I could approach this problem so I can keep the references correct?

Answer 1

Never mind, I found the solution in the meantime, at least how to get the auto generated key:

in your DAO, add the @GetGeneratedKeys annotation, make sure that your return value of the method matches the value of the generated key:

@SqlUpdate("insert into addresses (line_1) values ('address line 1')") @GetGeneratedKeys public long insertAddress(); 

In your resource then, you can simply use the return value:

long id = customerDAO.insertAddress(); System.out.println("Found id " + id); 

This works to get the generated key for one statement, however in my case, I still need to make multiple queries and fill in the correct references manually.

Should anyone have an idea how I could simplify this process and let the references be filled in automatically, I still would be interested to hear about.

Thanks.