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Process one feature at a time

sunsilk11
Contributor
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Hi,

I have multiple features, for each I need use an Oracle sequence to get the ID of the feature.

Then I need to write the feature to the database. The ID must be unique.

I have used a SQLExecutor to obtain the sequence next value. 

I am struggling when there are multiple features to write. FME is executing the SQLExecutor multiple times before getting single value for the ID. 

I need to process each feature at a time i.e. run through SQLExecutor, get the feature ID and write feature to database, then proceed to next feature.

 

Any suggestions ?

 

 

    2 replies

    daveatsafe
    Safer
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    • daveatsafeSafer
    • Safer
    • May 22, 2024

    Hi @sunsilk11,

    Use a Sampler transformer to extract the first feature, then send it to the SQLExecutor to get the last Oracle sequence number. Use a FeatureMerger to merge that value on all the other features, then use that value as the Count Start in a Counter to create subsequent sequence values for all the features.

    I am attaching a workspace snippet to illustrate.

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    hkingsbury
    1 person upvoted this
    • hkingsbury
      hkingsbury
    geomancer
    Evangelist
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    • geomancerEvangelist
    • Evangelist
    • May 23, 2024

    I suspect the Oracle sequence will get out of sync this way, as you perform sequence_name.NEXTVAL once (in the SQLExecutor), but write many records to the database, each with its own unique ID.

    This could be handled directly in Oracle, by firing a trigger that gets sequence_name.NEXTVAL when a record is inserted into the table.

    Reply


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