Coalesce & NullIF menggunakan HQL

Hai, pada kesempatan kali ini saya mau membahas tentang function coalesce dan nullif menggunakan Hibernate Query Language. ok seperti biasa kita siapkan dulu datanya. contohnya saya punya tabel dan data seperti berikut:

Selanjutnya, kita buat DAO seperti berikut:

Implementasi Unit Testing:

Setelah itu coba jalankan unit testing untuk method testCoalesceFunction(), maka hasilnya seperti berikut:

Jan 24, 2021 2:25:55 PM org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator initiateService
INFO: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
Hibernate: 
    select
        coalesce(penerbit0_.noFax,
        penerbit0_.phoneNumber,
        'publisher not have contact number!') as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: 1
Hibernate: 
    select
        coalesce(penerbit0_.noFax,
        penerbit0_.phoneNumber,
        'publisher not have contact number!') as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: 2
Hibernate: 
    select
        coalesce(penerbit0_.noFax,
        penerbit0_.phoneNumber,
        'publisher not have contact number!') as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: 2
Hibernate: 
    select
        coalesce(penerbit0_.noFax,
        penerbit0_.phoneNumber,
        'publisher not have contact number!') as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: publisher not have contact number!

Dan kemudian yang terakhir, coba jalankan method testNullIfFunction(), maka hasilnya seperti berikut:

Jan 24, 2021 2:26:44 PM org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator initiateService
INFO: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
Hibernate: 
    select
        nullif(penerbit0_.noFax,
        penerbit0_.phoneNumber) as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: 1
Hibernate: 
    select
        nullif(penerbit0_.noFax,
        penerbit0_.phoneNumber) as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: null
Hibernate: 
    select
        nullif(penerbit0_.noFax,
        penerbit0_.phoneNumber) as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: null
Hibernate: 
    select
        nullif(penerbit0_.noFax,
        penerbit0_.phoneNumber) as col_0_0_ 
    from
        Penerbit penerbit0_ 
    where
        penerbit0_.id=?
[main] INFO com.maryanto.dimas.bootcamp.test.query.hql.TestHQLCoalesceAndNullIF - data: null

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