Database: DataHandler basics (formerly known as TCEmain)

When you are using TCE from your backend applications you need to prepare two arrays of information which contain the instructions to DataHandler (\TYPO3\CMS\Core\DataHandling\DataHandler) of what actions to perform. They fall into two categories: data and commands.

"Data" is when you want to write information to a database table or create a new record.

"Commands" is when you want to move, copy or delete a record in the system.

The data and commands are created as multidimensional arrays and to understand the API of DataHandler you simply need to understand the hierarchy of these two arrays.


The DataHandler needs a properly configured TCA. If your field is not configured in the TCA the DataHandler is not able to interact with it. This also is the case if you configured "type"="none" (which is in fact a valid type) or if an invalid type is specified. In that case the DataHandler is not able to determine the correct value of the field.

Commands Array


$cmd[ tablename ][ uid ][ command ] = value

Description of keywords in syntax:

Key Data type Description
tablename string Name of the database table. Must be configured in $TCA array, otherwise it cannot be processed.
uid integer The UID of the record that is manipulated. This is always an integer.
command string (command keyword)

The command type you want to execute.


Only one command can be executed at a time for each record! The first command in the array will be taken.

See table below for :ref:`command keywords and values <tce-command-keywords>`

value mixed

The value for the command

See table below for :ref:`command keywords and values <tce-command-keywords>`

Command keywords and values

Command Data type Value
copy integer

The significance of the value depends on whether it is positive or negative:

  • Positive value: The value points to a page UID. A copy of the record (and possibly child elements/tree below) will be inserted inside that page as the first element.
  • Negative value: The (absolute) value points to another record from the same table as the record being copied. The new record will be inserted on the same page as that record and if $TCA[...]['ctrl']['sortby'] is set, then it will be positioned after.
  • Zero value: Record is inserted on tree root level.
move integer Works like "copy" but moves the record instead of making a copy.
delete 1

Value should always be "1"

This action will delete the record (or mark the record "deleted" if configured in $TCA).

undelete 1

Value should always be "1".

This action will set the deleted-flag back to 0.

localize integer

Pointer to a sys_language uid to localize the record into. Basically a localization of a record is making a copy of the record (possibly excluding certain fields defined with l10n_mode) but changing relevant fields to point to the right sys language / original language record.

Requirements for a successful localization is this:

  • [ctrl] options "languageField" and "transOrigPointerField" must be defined for the table
  • A sys_language record with the given sys_language_uid must exist.
  • The record to be localized by currently be set to "Default" language and not have any value set for the transOrigPointerField either.
  • There cannot exist another localization to the given language for the record (looking in the original record PID).

Apart from this, ordinary permissions apply as if the user wants to make a copy of the record on the same page.

version array

Versioning action.


  • [action] : Keyword determining the versioning action. Options are:
    • "new": Indicates that a new version of the record should be created.Additional keys, specific for "new" action:
      • [treeLevels]: (Only pages) Integer, -1 to 4, indicating the number of levels of the page tree to version together with a page. This is also referred to as the versioning type:-1 ("element") means only the page record gets versioned (default)0 ("page") means the page + content tables (defined by ctrl-flag versioning_followPages )>0 ("branch") means the the whole branch is versioned ( full copy of all tables), down to the level indicated by the value (1= 1 level down, 2= 2 levels down, etc.)The treeLevel is recorded in the field t3ver_swapmode and will be observed when the record is swapped during publishing.
      • [label]: Indicates the version label to apply. If not given, a standard label including version number and date is added.
    • "swap": Indicates that the current online version should be swapped with another.Additional keys, specific for "swap" action:
      • [swapWith]: Indicates the uid of the record to swap current version with!
      • [swapIntoWS]: Boolean, indicates that when a version is published it should be swapped into the workspace of the offline record.
    • "clearWSID": Indicates that the workspace of the record should be set to zero (0). This removes versions out of workspaces without publishing them.
    • "flush": Completely deletes a version without publishing it.
    • "setStage": Sets the stage of an element. Special feature: The id- key in the array can be a comma list of ids in order to perform the stageChange over a number of records. Also, the internal variable ->generalComment (also available through :file:`tce_db.php` as "&generalComment") can be used to set a default comment for all stage changes of an instance of tcemain. Additional keys for this action is:
      • [stageId]: Values are: -1 (rejected), 0 (editing, default), 1 (review), 10 (publish)
      • [comment]: Comment string that goes into the log.

Examples of commands:

$cmd['tt_content'][54]['delete'] = 1;    // Deletes tt_content record with uid=54
$cmd['pages'][1203]['copy'] = -303;   //Copies page id=1203 to the position after page 303
$cmd['pages'][1203]['move'] = 303;  // Moves page id=1203 to the first position in page 303

Data Array


$data[tablename][uid][fieldname] = value

Description of keywords in syntax:

Key Data type Description
tablename string Name of the database table. Must be configured in $TCA array, otherwise it cannot be processed.
uid mixed The UID of the record that is modified. If the record already exists, this is an integer. If you're creating new records, use a random string prefixed with "NEW", e.g. "NEW7342abc5e6d".
fieldname string Name of the database field you want to set a value for. Must be configure in $TCA[ tablename ]['columns']
value string

Value for "fieldname".


Always make sure $this->stripslashes_values is false before using DataHandler.)


For FlexForms the data array of the FlexForm field is deeper than three levels. The number of possible levels for FlexForms is infinite and defined by the data structure of the FlexForm. But FlexForm fields always end with a "regular value" of course.

Examples of Data submission

This creates a new page titled "The page title" as the first page inside page id 45:

$data['pages']['NEW9823be87'] = array(
    'title' => 'The page title',
    'subtitle' => 'Other title stuff',
    'pid' => '45'

This creates a new page titled "The page title" right after page id 45 in the tree:

$data['pages']['NEW9823be87'] = array(
    'title' => 'The page title',
    'subtitle' => 'Other title stuff',
    'pid' => '-45'

This creates two new pages right after each other, located right after the page id 45:

$data['pages']['NEW9823be87'] = array(
    'title' => 'Page 1',
    'pid' => '-45'
$data['pages']['NEWbe68s587'] = array(
    'title' => 'Page 2',
    'pid' => '-NEW9823be87'

Notice how the second "pid" value points to the "NEW..." id placeholder of the first record. This works because the new id of the first record can be accessed by the second record. However it works only when the order in the array is as above since the processing happens in that order!

This creates a new content record with references to existing and one new system category:

$data['sys_category']['NEW9823be87'] = array(
    'title' => 'New category',
    'pid' => 1,
$data['tt_content']['NEWbe68s587'] = array(
    'header' => 'Look ma, categories!',
    'pid' => 45,
    'categories' => array(
        'NEW9823be87', // You can also use placeholders here

This updates the page with uid=9834 to a new title, "New title for this page", and no_cache checked:

$data['pages'][9834] = array(
    'title' => 'New title for this page',
    'no_cache' => '1'

Clear cache

TCE also has an API for clearing the cache tables of TYPO3:


$cacheCmd values Description
[integer] Clear the cache for the page id given.

Clears all cache tables (cache_pages, cache_pagesection, cache_hash).

Only available for admin-users unless explicitly allowed by User TSconfig "options.clearCache.all".


Clears all pages from cache_pages.

Only available for admin-users unless explicitly allowed by User TSconfig "options.clearCache.pages".

Hook for cache post-processing

You can configure cache post-processing with a user defined PHP function. Configuration of the hook can be done from ext_localconf.php. An example might look like:

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc'][] = 'myext_cacheProc->proc';
require_once(\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extPath('myext') . 'class.myext_cacheProc.php');

Flags in DataHandler

There are a few internal variables you can set prior to executing commands or data submission. These are the most significant:

Internal variable Data type Description
->deleteTree Boolean

Sets whether a page tree branch can be recursively deleted.

If this is set, then a page is deleted by deleting the whole branch under it (user must have delete permissions to it all). If not set, then the page is deleted only if it has no branch.

Default is false.

->copyTree Integer

Sets the number of branches on a page tree to copy.

If 0 then branch is not copied. If 1 then pages on the 1st level is copied. If 2 then pages on the second level is copied, and so on.

Default is zero.

->reverseOrder Boolean

If set, the data array is reversed in the order, which is a nice thing if you're creating a whole bunch of new records.

Default is zero.

->copyWhichTables list of strings (tables)

This list of tables decides which tables will be copied. If empty then none will. If "*" then all will (that the user has permission to of course).

Default is "*".

->stripslashes_values boolean

If set, then all values will be passed through stripslashes(). This has been the default since the birth of TYPO3 in times when input from POST forms were always escaped an needed to be unescaped. Today this is deprecated and values should be passed around without escaped characters.


It is highly recommended to set this value to zero every time the class is used!

If you set this value to false you can pass values as-is to the class and it is most like that this is what you want. Otherwise you would have to pass all values through addslashes() first.

Default is (currently) "1" (true) but might be changed in the future!