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f5156c61de
Ingests net-new /community knowledge from BC Code Intelligence, surviving the admission test, gray-zone salvage, and dedup against the full corpus. Domains: ui (6), error-handling (3), performance (2), upgrade (1), appsource (1), security (1), telemetry (1). The two BC24 No. Series migration drafts are merged into one article. Adds good/bad AL samples for the clean-fit articles (error-handling, performance, security, telemetry). UI and appsource remain knowledge-only. Validator and knowledge-index checks pass (207 articles). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
24 lines
1.7 KiB
Markdown
24 lines
1.7 KiB
Markdown
---
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bc-version: [all]
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domain: error-handling
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keywords: [table-events, oninsert, onmodify, ondelete, transaction, rollback, commit, batch, subscriber]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# A throw in a table-event subscriber rolls back the whole batch
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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Table-trigger event subscribers (`OnAfterInsertEvent`, `OnAfterModifyEvent`, `OnAfterDeleteEvent`, and their `OnBefore` counterparts) execute synchronously inside the transaction of the write that fired them. Because AL runs on a single implicit transaction with no per-record savepoint, an error raised in such a subscriber rolls back **all work since the last `COMMIT`** — not just the record that triggered it. In a batch loop with no intermediate `COMMIT`s, a single failing record discards the entire batch. The intuition that subscriber validation fails only the current record is wrong on the BC platform.
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## Best Practice
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Decide the failure granularity deliberately. If a batch must continue past individual failures, do not throw from the table-event subscriber — collect the error (for example via `ErrorInfo`/collectible errors) and let the loop continue, or isolate each record's work behind a `Codeunit.Run` / `if Codeunit.Run() then` boundary so its failure rolls back only that record. Insert intermediate `COMMIT`s only with full awareness of the durability trade-off.
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## Anti Pattern
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Putting `Error`/`TestField`/`FieldError` validation inside a table-event subscriber and assuming it rejects just the offending record during bulk processing. The first failure unwinds every uncommitted record in the run, turning a one-row data problem into a whole-batch rollback.
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