The steps involved are:
- test the incoming features for a value which will determine whether the feature is an update, delete or insert
- add the attribute fme_db_operation to the features and assign it a value - either UPDATE/DELETE/INSERT
- set the UPDATE KEY COLUMN to an attribute that will match the input features to the database features - in this case it is the attribute "ID". For writers that do not have the Update Key Field use the fme_where format attribute
- change the WRITER MODE on the destination dataset to UPDATE (this causes the writer to recognize the fme_db_operation attribute)
The FME Format Attribute, fme_db_operation, is available on most of the database readers and writers. See the FME User Documentation
The second sample workspace focuses on the use of writer mode on the feature itself - see DataBaseWriterMode.fmwt.
Suggested Similar Articles
The Smallworld FME Translator 4.2.2 and higher supports incremental updates to the Smallworld VMDS. It utilizes the fme_db_operation attribute to specify the type of update - INSERT, UPDATE or DELETE
This example shows how to build an xfMap to read complex XML or GML.
Example custom transformer which sets up the format attributes prior to using a database writer in UPDATE mode to update feature attributes only.
"What's Great" is a summary list of all the new and updated functionality in a particular version of FME. This is the list for FME Desktop 2012.
The Database writer is set to UPDATE mode, the fme_db_operation attribute may or may not be set, and a field has been identified as the key to finding the features to be updated but it doesn't appear to be doing the UPDATEs or DELETEs.