TYPO3 Core

I mean any where clause. If the where clause fails, it should insert instead of update.

E.g. a specific tt_address record belongs to an fe_user. The first time the user sends the form, it should insert a new tt_address record and the next times the user sends the form it should update the existing tt_address record (which matches the where clause).

The same like formhandler had insertIfNoUpdatePossible (http://www.typo3-formhandler.com/documentation/finisher/finisherdb/): If the update fails because the record to be updated does not exist, a new record will be created in the table.

I currently have a save to database finisher (without a solution):

finishers:
  -
    options:
      -
        table: tt_address
        mode: insert
        databaseColumnMappings:
          pid:
            value: 6475
          name:
            value: '{firstname} {lastname}'
          tstamp:
            value: '{__currentTimestamp}'
          crdate:
            value: '{__currentTimestamp}'
        elements:
          image:
            mapOnDatabaseColumn: image
          title:
            mapOnDatabaseColumn: title
            skipIfValueIsEmpty: true
          gender:
            mapOnDatabaseColumn: gender
          lastname:
            mapOnDatabaseColumn: last_name
          firstname:
            mapOnDatabaseColumn: first_name
          email:
            mapOnDatabaseColumn: email
          studycourses:
            mapOnDatabaseColumn: course
            skipIfValueIsEmpty: true
          employer:
            mapOnDatabaseColumn: custom1
          tasks:
            mapOnDatabaseColumn: custom2
          reasonwhy:
            mapOnDatabaseColumn: custom3
            skipIfValueIsEmpty: true
          uniprepared:
            mapOnDatabaseColumn: custom4
            skipIfValueIsEmpty: true
          advantagesmalluni:
            mapOnDatabaseColumn: custom5
          studylike:
            mapOnDatabaseColumn: custom6
            skipIfValueIsEmpty: true
          opennesschange:
            mapOnDatabaseColumn: custom7
          tenyears:
            mapOnDatabaseColumn: custom8
            skipIfValueIsEmpty: true
          freshmanadvice:
            mapOnDatabaseColumn: custom9
            skipIfValueIsEmpty: true
      -
..........
    identifier: SaveToDatabase

(tt_address has a few custom fields)

It should be with mode update and
options.whereClause = feuser = TSFE:fe_user|user|uid
(overwritten in Typoscript)

But if the where clause fails it should make an insert of the tt_address entry.
This way an fe_user could insert and update his own tt_address entry.

I think I could write a condition like
[getTSFE.fe_user.user["addressentry"] > 0]
And if true then overwrite mode insert with update. Should work.