Hibernate Generate Uuid As Primary Keys
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- Hibernate Generate Uuid As Primary Keys In Windows 10
- Postgresql Uuid As Primary Key
- Hibernate Generate Uuid As Primary Keys Download
- Hibernate Generate Uuid As Primary Keys Free
Hibernate Generate Uuid As Primary Keys In Windows 10
| importjava.io.Serializable; |
| importjava.nio.ByteBuffer; |
| importjava.util.Arrays; |
| importjava.util.UUID; |
| importjavax.persistence.Access; |
| importjavax.persistence.AccessType; |
| importjavax.persistence.Column; |
| importjavax.persistence.Embeddable; |
| @Embeddable |
| @Access(AccessType.FIELD) |
| publicclassUniqueIdimplementsSerializable { |
| privatestaticfinallong serialVersionUID =4458438725376203754L; |
| @Column(columnDefinition='BINARY(16)', length=16, updatable=false, nullable=false) |
| privatebyte[] id; |
| publicUniqueId() {} |
| publicUniqueId(byte[] id) { |
| this.id = id; |
| } |
| publicUniqueId(Stringid) { |
| this(toByteArray(UUID.fromString(id))); |
| } |
| @Override |
| publicStringtoString() { |
| return toUUID(id).toString(); |
| } |
| publicstaticUniqueIdfromString(Strings) { |
| return fromUUID(UUID.fromString(s)); |
| } |
| publicstaticUniqueIdfromUUID(UUIDuuid) { |
| returnnewUniqueId(toByteArray(uuid)); |
| } |
| privatestaticbyte[] toByteArray(UUIDuuid) { |
| ByteBuffer bb =ByteBuffer.wrap(newbyte[16]); |
| bb.putLong(uuid.getMostSignificantBits()); // order is important here! |
| bb.putLong(uuid.getLeastSignificantBits()); |
| return bb.array(); |
| } |
| privatestaticUUIDtoUUID(byte[] byteArray) { |
| long msb =0; |
| long lsb =0; |
| for (int i =0; i <8; i++) |
| msb = (msb <<8) (byteArray[i] &0xff); |
| for (int i =8; i <16; i++) |
| lsb = (lsb <<8) (byteArray[i] &0xff); |
| UUID result =newUUID(msb, lsb); |
| return result; |
| } |
| @Override |
| publicinthashCode() { |
| finalint prime =31; |
| int result =1; |
| result = prime * result +Arrays.hashCode(id); |
| return result; |
| } |
| @Override |
| publicbooleanequals(Objectobj) { |
| if (this obj) |
| returntrue; |
| if (obj null) |
| returnfalse; |
| if (getClass() != obj.getClass()) |
| returnfalse; |
| UniqueId other = (UniqueId) obj; |
| if (!Arrays.equals(id, other.id)) |
| returnfalse; |
| returntrue; |
| } |
| publicstaticUniqueIdgenerate() { |
| return fromUUID(UUID.randomUUID()); |
| } |
| } |
Postgresql Uuid As Primary Key
commented Feb 12, 2016
The default way in JPA for primary keys is to use the @GeneratedValue annotation with the strategy attribute set to one of AUTO, IDENTITY, SEQUENCE, or TABLE. You pick the most appropriate strategy for your situation and that’s it. But you can also choose to generate the primary key yourself. Using UUIDs for this is ideal and has some great. Using Hibernate to generate id incrementally As we have seen in the last section that the increment class generates identifiers of type long, short or int that are unique only when no other process is inserting data into the same table. In this lesson I will. Jul 04, 2019 Some of its usage are for creating random file names, session id in web application, transaction id and for record’s primary keys in database replacing the sequence or auto generated number. To generate UUID in Java we can use the java.util.UUID class. MySQL UUID vs. Auto-Increment INT as primary key Pros. Using UUID for a primary key brings the following advantages. UUID values are unique across tables, databases, and even servers that allow you to merge rows from different databases or distribute databases across servers.
Hibernate Generate Uuid As Primary Keys Download
Jul 04, 2019 UUID / GUID (Universally / Globally Unique Identifier) is frequently use in programming. Some of its usage are for creating random file names, session id in web application, transaction id and for record’s primary keys in database replacing the sequence or auto generated number. Oct 10, 2017 Most developers prefer numerical primary keys because they are efficient to use and easy to generate. But that doesn’t mean that a primary key has to be a number. UUIDs, for example, have gained.
Lifesaver! Used this for general byte[] primary keys with a reordered UUID component |