What is uuid_ ?

[Nguyen Van Chuong, modificado 12 Anos atrás.]

hi every body !
i don't know uuid_ . help me
thanks .

example:

CREATE TABLE `bookmarksfolder` (
[size=6] [b]`uuid_` varchar(75) collate utf8_unicode_ci default NULL,[/b][/size]
  `folderId` bigint(20) NOT NULL,
  `groupId` bigint(20) default NULL,
  `companyId` bigint(20) default NULL,
  `userId` bigint(20) default NULL,
  `userName` varchar(75) collate utf8_unicode_ci default NULL,
  `createDate` datetime default NULL,
  `modifiedDate` datetime default NULL,
  `resourceBlockId` bigint(20) default NULL,
  `parentFolderId` bigint(20) default NULL,
  `name` varchar(75) collate utf8_unicode_ci default NULL,
  `description` longtext collate utf8_unicode_ci,
  PRIMARY KEY  (`folderId`),
  UNIQUE KEY `IX_DC2F8927` (`uuid_`,`groupId`),
  KEY `IX_2ABA25D7` (`companyId`),
  KEY `IX_7F703619` (`groupId`),
  KEY `IX_967799C0` (`groupId`,`parentFolderId`),
  KEY `IX_28A49BB9` (`resourceBlockId`),
  KEY `IX_451E7AE3` (`uuid_`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

[Ram Manusani, modificado 12 Anos atrás.]

It is a Universal unique Identifier, UUID (or GUID) is a unique identifier that can be created without a central authority. UUIDs can be used if a sequence number is not good enough. This implementation is thread safe and very fast.

[Nguyen Van Chuong, modificado 12 Anos atrás.]

thaks you

[Danny Stevens, modificado 11 Anos atrás.]

Ram Manusani:

It is a Universal unique Identifier, UUID (or GUID) is a unique identifier that can be created without a central authority. UUIDs can be used if a sequence number is not good enough. This implementation is thread safe and very fast.

If you are copying a user or group from one Liferay server to another would a uuid be certain to be unique in the new Liferay server?

[Brian Kim, modificado 11 Anos atrás.]

Danny Stevens:

Ram Manusani:

It is a Universal unique Identifier, UUID (or GUID) is a unique identifier that can be created without a central authority. UUIDs can be used if a sequence number is not good enough. This implementation is thread safe and very fast.

If you are copying a user or group from one Liferay server to another would a uuid be certain to be unique in the new Liferay server?

Your question isn't really clear. What do you mean by "copying"? In what way is the "one Liferay server" related to the "new Liferay server"?