If set, versioning is enabled for this table.
The field details explained here are outdated.
Versioning in TYPO3 is based on this scheme:
[Online version, pid>=0] 1- * [Offline versions, pid==1]
Offline versions are identified by having a pid value = -1 and they refer to their online version by the field "t3ver_oid". Offline versions of the "Page" and "Branch" types (contrary to "Element" type) can have child records which points to the uid of their offline "root" version with their pid fields (as usual). These children records are typically copies of child elements of the online version of the offline root version, but are not considered "versions" of them in a technical sense, hence they don't point to them with their t3ver_oid field (and shouldn't).
In the backend "Offline" is labeled "Draft" while "Online" is labeled "Live".
In order for versioning to work on a table there are certain requirements; Tables supporting versioning must have these fields:
For offline versions; pointing back to online version uid. For online: 0 (zero)
Incremental integer (version number)
Version label, e.g. "1.1.1" or "Christmas edition"
For offline versions: Workspace ID of version. For all workspace Ids apart from 0 (zero) there can be only one version of an element per ID. For online: 0 (zero) unless t3ver_state is set in which case it plays a role for previews in the backend (to no de-select placeholders for workspaces, see
\TYPO3\CMS\Backend\Utility\BackendUtility::versioningPlaceholderClause())and for publishing of move-to-actions (see
Contains special states of a version used when new, deleted, moved content requires versioning.
For an online version:
"1" or "2" means that it is a temporary placeholder for a new element (which is the offline version of this record)
"3" means it is a "move-to-location" placeholder and t3ver_move_id holds uid of online record (with an offline version) to move . Unlike for "1" and "2" there is no offline version of this record type! (V2 feature)
If "t3ver_state" has a value >0 it should never be shown in Live workspace.
For an offline version:
"1" or "2" means that when published, the element must be deleted (placeholder for delete-action).
"-1" means it is just an indication that the online version has the flag set to "1" (is a placeholder for new records.). This only affects display, not processing anywhere.
"4" means this version is a "move-pointer" for the online record and an online "move-to-location" (t3ver_state=3) record exists. (V2 feature)
Contains the ID of the stage at which the record is. Special values are "0" which still refers to "edit", "-10" refers to "ready to publish".
0/offline=draft/never published, 0/online=current, 1/offline=archive, 1+=multiple online/offline occurrences (incrementation happens when versions are swapped offline.)
Timestamp of last swap/publish action.
For online records with t3ver_state=3 this indicates the online record to move to this location upon publishing of the offline version of the online record "t3ver_move_id" points to.
The fields pid and uid should have "signed" attributes in MySQL (so their content can be negative!)
Corresponding SQL definitions:
t3ver_oid int(11) DEFAULT '0' NOT NULL, t3ver_id int(11) DEFAULT '0' NOT NULL, t3ver_wsid int(11) DEFAULT '0' NOT NULL, t3ver_label varchar(30) DEFAULT '' NOT NULL, t3ver_state tinyint(4) DEFAULT '0' NOT NULL, t3ver_stage int(11) DEFAULT '0' NOT NULL,
Special "t3ver_swapmode" field for pages
When pages are versioned it is an option whether content and even the branch of the page is versioned. This is determined by the parameter "treeLevels" set when the page is versioned. "-1" means swap only record, 0 means record and content and >0 means full branch. When the version is later published the swapping will happen accordingly.