Oracle NoSQL Reading Writing LOBs

OracleNoSQL supports reading/ writing of Large Objects LOBs such as audio and video files. Using Kundera, you can read/ write LOBs using attribute of type java.io.File in entity classes.

Here is an example:

UserProfile.java

@Entity
@Table(name = "USER_PROFILE", schema = "HR_Store@oracle_nosql_pu")
public class UserProfile
{
    @Id
    @Column(name = "USER_ID")
    private int userId;

    @Column(name = "USER_NAME")
    private String userName;

    @Column(name = "PROFILE_PICTURE")
    private File profilePicture;
    
    public UserProfile(int userId, String userName, File profilePicture)
    {
        super();
        this.userId = userId;
        this.userName = userName;
        this.profilePicture = profilePicture;
    }

    //Getters and setters
}

LOBExample.java (Snippet)

        //Insert user profile alongwith picture
        File file = new File("/home/amresh/MyPhoto.jpg");
        long fileSize = file.getTotalSpace();
        UserProfile userProfile = new UserProfile(1, "Amresh", file);
        em.persist(userProfile);

        //Clear Cache
        em.clear();

        //Find user profile
        UserProfile up = (UserProfile) em.find(UserProfile.class, 1);
        File myPicture = up.getProfilePicture();

        //Delete Profile
        em.remove(userProfile);

Note: Before performing LOB operations, you can configure below parameters that are applied on all operations until em.close() is called. (In absence, default OracleNoSQL settings are applied).

        em.setProperty("write.timeout", 10);
        em.setProperty("durability", Durability.COMMIT_WRITE_NO_SYNC);
        em.setProperty("time.unit", TimeUnit.SECONDS);
        em.setProperty("consistency", Consistency.NONE_REQUIRED);

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