Hibernate Generate Uuid As Primary Keys
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- 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.
- 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.
Hibernate to generate id (primary key) The optional child element names a Java class used to generate unique identifiers for instances of the persistent class increment generates identifiers of type long, short or int that are unique only when no.
| 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()); |
| } |
| } |
commented Feb 12, 2016
Lifesaver! Used this for general byte[] primary keys with a reordered UUID component |