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https://issues.apache.org/jira/browse/NIFI-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15200858#comment-15200858
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ASF GitHub Bot commented on NIFI-1575:
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Github user mattyb149 closed the pull request at:
https://github.com/apache/nifi/pull/261
> Add ability to query DB table using "last value" from column
> ------------------------------------------------------------
>
> Key: NIFI-1575
> URL: https://issues.apache.org/jira/browse/NIFI-1575
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Fix For: 0.6.0
>
>
> It would be a useful feature for a processor to be able to query from a
> database table for only those records that have are added/available since the
> last time the query was executed. For example, if the processor could keep
> the max value of a timestamp column for the last result set returned, the
> next time the query was issued, it could use that timestamp value and column
> to only return records whose timestamps were greater than "the last time".
> This shouldn't be limited to timestamps of course; it would be useful for any
> strictly-increasing value (like primary key ID) but would be up to the user
> to select the table and column. The processor would simply keep the state for
> the specified column's max value.
> Proposed is a "QueryDBTable" processor which would have a properties to
> specify the table name and the column in the table for which to keep state
> information about the last maximum value retrieved. Subsequent queries of the
> table use this value to filter for rows whose value for the specified column
> are greater than the "last maximum value". Upon each successful query, the
> "last maximum value" is updated.
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