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Describe about DAO in Spring framework?

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Anjali Sharma answered on January 9, 2023 Popularity 1/10 Helpfulness 1/10

answer Describe about DAO in Spring framework?

Describe about DAO in Spring framework?

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DAO is used to provide integration of Java database connectivity and Object relational mapping objects.

is spring framework provides connection for JDBC, hibernate, JDO, JPA, Common client interface and Oracle.

public class UserApplication {

    private static Dao<User> jpaUserDao;

    // standard constructors
    
    public static void main(String[] args) {
        User user1 = getUser(1);
        System.out.println(user1);
        updateUser(user1, new String[]{"Jake", "jake@domain.com"});
        saveUser(new User("Monica", "monica@domain.com"));
        deleteUser(getUser(2));
        getAllUsers().forEach(user -> System.out.println(user.getName()));
    }
    
    public static User getUser(long id) {
        Optional<User> user = jpaUserDao.get(id);
        
        return user.orElseGet(
          () -> new User("non-existing user", "no-email"));
    }
    
    public static List<User> getAllUsers() {
        return jpaUserDao.getAll();
    }
    
    public static void updateUser(User user, String[] params) {
        jpaUserDao.update(user, params);
    }
    
    public static void saveUser(User user) {
        jpaUserDao.save(user);
    }
    
    public static void deleteUser(User user) {
        jpaUserDao.delete(user);
    }
}

https://www.baeldung.com/java-dao-pattern

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: dao describe javascript spring

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Contributed on Jan 09 2023

Anjali Sharma

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