Computer scienceBackendSpring BootSpring Data

Transaction management

Theory

Examples

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Which of the following examples will work correctly and keep our data consistent? Pay attention to the access modifiers of the methods.

Java 
  1. @Transactional
private void doTransaction() {
    var person = new Record();
    person.setName("Mike");
    repository.save(person);

    if (person.getId() > 0) {
        throw new RuntimeException();
    }

    person.setName("Bob");
    repository.save(person);
}
  2. public void doTransaction() {
    var person = new Record();
    person.setName("Mike");
    repository.save(person);

    @Transactional
    if (person.getId() > 0) {
        throw new RuntimeException();
    }

    person.setName("Bob");
    repository.save(person);
}
  3. @Transactional(readOnly = false)
public void doTransaction() {
    var person = new Record();
    person.setName("Mike");
    repository.save(person);

    if (person.getId() > 0) {
        throw new RuntimeException();
    }

    person.setName("Bob");
    repository.save(person);
}
  4. @Transactional(readOnly = true)
public void doTransaction() {
    var person = new Record();
    person.setName("Mike");
    repository.save(person);

    if (person.getId() > 0) {
        throw new RuntimeException();
    }

    person.setName("Bob");
    repository.save(person);
}
Kotlin 
  1. @Transactional
private fun doTransaction() {
    val person = Record()
    person.name = "Mike"
    repository.save(person)
    
    if (person.getId() > 0) {
        throw RuntimeException()
    }
    
    person.name = "Bob"
    repository.save(person)
}
  2. fun doTransaction() {
    val person = new Record();
    person.name = "Mike"
    repository.save(person)

    @Transactional
    if (person.getId() > 0) {
        throw RuntimeException()
    }

    person.name = "Bob"
    repository.save(person);
}
  3. @Transactional(readOnly = false)
fun doTransaction() {
    val person = Record()
    person.name = "Mike"
    repository.save(person)
    
    if (person.getId() > 0) {
        throw RuntimeException()
    }
    
    person.name = "Bob"
    repository.save(person)
}
  4. @Transactional(readOnly = true)
fun doTransaction() {
    val person = Record()
    person.name = "Mike"
    repository.save(person)
    
    if (person.getId() > 0) {
        throw RuntimeException()
    }
    
    person.name = "Bob"
    repository.save(person)
}
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