What is Considered Best Practice for Error Handling in Components?

What would be the best approach to handling errors in custom (possibly composite) components?
I see three different possibilities:
Having the error handling funciton within the component. The problem is that this is not adaptable to the consumers error handling setup (i.e. logging to database, redirecting to a pretty error screen, etc.).
Passing in an error function as a parameter. The problem here is how to have the externally defined error function interact with external elements that are not defined within the component, i.e. passing the error or fault object to a logging class, or something similar, of which the component knows nothing about.
Referencing the external error handling methods directly from within the component. (Of course that's shabby programming, just listing as a technical option.)
How do you solve this?
My goal is to have a versatile custom component that can utilize any given consumer's error handler.
Thanks,
Mike

or define a customized event and dispatch it when error occur, then you can just listen to it outside

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Please follow basic Netiquette and post the DDL we need to answer this. Follow industry and ANSI/ISO standards in your data. You should follow ISO-11179 rules for naming data elements. You should follow ISO-8601 rules for displaying temporal data. We need
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>> My final data table contains a two key columns unique key constraint. [unh? one two-column key or two one column keys? Sure wish you posted DDL] I insert data into this table from a daily capture table (which also contains the two columns that make
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--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
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