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  1. Apache NiFi
  2. NIFI-3742

PutDatabaseRecord can not delete row if it contains null value

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.2.0
    • Fix Version/s: 1.2.0
    • Component/s: Extensions
    • Labels:
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      Description

      For example, let's say a table which has null-able columns. When rows get deleted, CaptureChangeMySQL emits 'delete' events for each deleted row with all column values including null-able ones. From those data, PutDatabaseRecord can generate delete statements for other table which have where clause like this:

      DELETE FROM users WHERE id = 4 AND title = null AND first = 'Koji' AND last = 'Kawamura' AND street = null AND city = null AND state = null AND zip = null AND gender = null AND email = null AND username = null AND password = null AND phone = null AND cell = null AND ssn = null AND date_of_birth = null AND reg_date = null AND large = null AND medium = null AND thumbnail = null AND version = null AND nationality = null
      

      However, a condition like 'title = null' doesn't hit with any record, because for null value, we should use 'title IS null' instead.
      I think we should do something like below in order to treat these null-able columns:

      # With a prepared statement like this:
      DELETE FROM users WHERE id = ? AND (title = ? OR (title is null AND ? is null)) AND ... so on ...;
      # Which is executed like this:
      DELETE FROM users WHERE id = 4 AND (title = null OR (title is null AND null is null)) … and so on …;
      

      Reference:
      http://stackoverflow.com/questions/4215135/how-to-deal-with-maybe-null-values-in-a-preparedstatement

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              • Assignee:
                mattyb149 Matt Burgess
                Reporter:
                ijokarumawak Koji Kawamura
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