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docs/navpatterns/patterns/observer/index.html
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@ -2,7 +2,7 @@
<head>
<meta charset=utf-8>
<meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no">
<meta name=generator content="Hugo 0.92.2">
<meta name=generator content="Hugo 0.93.0">
<meta name=robots content="index, follow">
<link rel="shortcut icon" href=/favicons/favicon.ico>
<link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180>
@ -14,8 +14,7 @@
<link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96>
<link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144>
<link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192>
<title>Observer | alguidelines.dev - Business Central Design Patterns</title>
<meta name=description content="By Nikolai L&rsquo;Estrange, from TVision Technology Ltd. in the UK
<title>Observer | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Nikolai L&rsquo;Estrange, from TVision Technology Ltd. in the UK
Abstract
Track all record changes against a defined table or set of tables. …">
<meta property="og:title" content="Observer">
@ -44,8 +43,7 @@ Solution Create a setup table to define which other tables you want to track cha
<link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity>
<script src=https://code.jquery.com/jquery-3.6.0.min.js integrity=sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK crossorigin=anonymous></script>
<script src=https://unpkg.com/lunr@2.3.9/lunr.min.js integrity=sha384-203J0SNzyqHby3iU6hzvzltrWi/M41wOP5Gu+BiJMz5nwKykbkUx8Kp7iti0Lpli crossorigin=anonymous></script>
</head>
<body class=td-page>
</head><body class=td-page>
<header>
<nav class="js-navbar-scroll navbar navbar-expand navbar-dark flex-column flex-md-row td-navbar">
<a class=navbar-brand href=/>
@ -57,36 +55,24 @@ Solution Create a setup table to define which other tables you want to track cha
<ul class="navbar-nav mt-2 mt-lg-0">
<li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=/docs/><i class="fas fa-book"></i><span>Docs</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://github.com/microsoft/alguidelines/discussions/ target=_blank><i class="fas fa-comments"></i><span>Discussions</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://github.com/microsoft/alguidelines target=_blank><i class="fab fa-github"></i><span>GitHub</span></a>
</li>
<li class="nav-item mr-4 mb-2 mb-lg-0">
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
<a class=nav-link href=https://discord.gg/4wbfNv3 target=_blank><i class="fab fa-discord"></i><span>Discord</span></a>
</li>
</ul>
</div>
<div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
</div>
</nav>
</header>
<div class="container-fluid td-outer">
</li></ul></div><div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
</div></nav></header><div class="container-fluid td-outer">
<div class=td-main>
<div class="row flex-xl-nowrap">
<aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none">
<div id=td-sidebar-menu class=td-sidebar__inner>
<div id=content-mobile>
<form class="td-sidebar__search d-flex align-items-center">
<input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
<input type=search class="form-control td-search-input" placeholder="&#xf002; Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
<button class="btn btn-link td-sidebar__toggle d-md-none p-0 ml-3 fas fa-bars" type=button data-toggle=collapse data-target=#td-section-nav aria-controls=td-docs-nav aria-expanded=false aria-label="Toggle section navigation">
</button>
</form>
</div>
<div id=content-desktop></div>
<nav class="collapse td-sidebar-nav" id=td-section-nav>
</form></div><div id=content-desktop></div><nav class="collapse td-sidebar-nav" id=td-section-nav>
<ul class="td-sidebar-nav__section pr-md-3 ul-0">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docs-li>
<a href=/docs/ title="AL Guidelines" class="align-left pl-0 td-sidebar-link td-sidebar-link__section tree-root" id=m-docs><span>Docs</span></a>
@ -104,9 +90,9 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/patterns/facade-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsfacade-pattern><span>Façade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsgeneric-method-pattern-li>
<a href=/docs/patterns/generic-method-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsgeneric-method-pattern><span>Generic Method</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsno-series-li>
<a href=/docs/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsno-series><span>No. Series</span></a>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
<a href=/docs/bestpractices/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsbestpractices><span>Best Practices</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesapi-page-li>
@ -153,9 +139,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/bestpractices/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariable-naming><span>Variable Naming</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariables-declarations-order-li>
<a href=/docs/bestpractices/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariables-declarations-order><span>Variables Declarations Order</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
<a href=/docs/navpatterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns><span>NAV Patterns Archive</span></a>
<ul class="ul-2 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatternspatterns-li>
@ -170,9 +154,7 @@ Solution Create a setup table to define which other tables you want to track cha
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity-li>
<a href=/docs/navpatterns/patterns/blocked-entity/data-driven-blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity><span>Data Driven Blocked Entity</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
<a href=/docs/navpatterns/patterns/cached-web-service-calls/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscached-web-service-calls><span>Cached Web Server Calls</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsconditional-cascading-update-li>
<a href=/docs/navpatterns/patterns/conditional-cascading-update/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsconditional-cascading-update><span>Conditional Cascading Update</span></a>
@ -227,9 +209,7 @@ Solution Create a setup table to define which other tables you want to track cha
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal-li>
<a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal><span>TryFunction NET Exception Handling in CAL</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
<a href=/docs/navpatterns/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsno-series><span>No Series</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsnotifications-li>
<a href=/docs/navpatterns/patterns/notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnotifications><span>Notifications</span></a>
@ -238,9 +218,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/patterns/notifications/in-context-notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsin-context-notifications><span>In-context Notifications</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern-li>
<a href=/docs/navpatterns/patterns/notifications/notification-lifecycle-management-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern><span>Notification Lifecycle Management Pattern</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child active-path" id=m-docsnavpatternspatternsobserver-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child active-path" id=m-docsnavpatternspatternsobserver-li>
<a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 active td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span class=td-sidebar-nav-active-item>Observer</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsposting-routine-select-behavior-li>
<a href=/docs/navpatterns/patterns/posting-routine-select-behavior/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsposting-routine-select-behavior><span>Posting Routine - Select Behavior</span></a>
@ -255,9 +233,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records><span>Use Queries to Detect Duplicate Records</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops-li>
<a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops><span>Use Queries to Replace Nested Loops</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
<a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span>Read-once Initialization and Validation</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsreleased-entity-li>
<a href=/docs/navpatterns/patterns/released-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreleased-entity><span>Released Entity</span></a>
@ -276,9 +252,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/patterns/security/4-masked-text/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity4-masked-text><span>Masked Text</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity5-ssl-in-nav-li>
<a href=/docs/navpatterns/patterns/security/5-ssl-in-nav/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity5-ssl-in-nav><span>SSL in NAV</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
<a href=/docs/navpatterns/patterns/setup-specificity-fallback/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssetup-specificity-fallback><span>Setup Specificity Fallback</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssilent-file-upload-and-download-li>
<a href=/docs/navpatterns/patterns/silent-file-upload-and-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssilent-file-upload-and-download><span>Silent File Upload and Download</span></a>
@ -294,11 +268,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/patterns/singleton/singleton-table/cue-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table><span>Cue Table</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table-li>
<a href=/docs/navpatterns/patterns/singleton/singleton-table/setup-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table><span>Setup Table</span></a>
</li>
</ul>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
</li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
<a href=/docs/navpatterns/patterns/standard-journal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsstandard-journal><span>Standard Journal</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstemporary-dataset-report-li>
<a href=/docs/navpatterns/patterns/temporary-dataset-report/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstemporary-dataset-report><span>Temporary Dataset Report</span></a>
@ -308,18 +278,14 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/patterns/transfer-custom-fields/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstransfer-custom-fields><span>Transfer Custom Fields</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsvariant-facade-li>
<a href=/docs/navpatterns/patterns/variant-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsvariant-facade><span>Variant Facade</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
<a href=/docs/navpatterns/2-anti-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns2-anti-patterns><span>2. Anti-Patterns</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsnav-upgrade-li>
<a href=/docs/navpatterns/2-anti-patterns/nav-upgrade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsnav-upgrade><span>Nav Upgrade</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsreusable-bugs-li>
<a href=/docs/navpatterns/2-anti-patterns/reusable-bugs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsreusable-bugs><span>Reusable Bugs</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelines><span>3. CAL Coding Guidelines</span></a>
<ul class="ul-3 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesign-li>
@ -353,18 +319,14 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch><span>Variable Capacity Mismatch</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision><span>WITH Scope Name Collision</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types><span>Internally used DotNet Types</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization><span>Internationalization</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate><span>Using Calcdate</span></a>
</li>
</ul>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability><span>Localizability</span></a>
<ul class="ul-4 foldable">
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables-li>
@ -377,9 +339,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityuse-text-constants><span>Use Text Constants</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml><span>Using OptionCaptionML</span></a>
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<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesreadability><span>Readability</span></a>
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-as-an-afterword-li>
@ -446,9 +406,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-naming><span>Variable Naming</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order><span>Variables Declarations Order</span></a>
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<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesux><span>UX</span></a>
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@ -459,11 +417,7 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/fielderror/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxfielderror><span>FIELDERROR</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error-li>
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/message-and-error/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error><span>MESSAGE and ERROR</span></a>
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<a href=/docs/navpatterns/4-get-involved/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns4-get-involved><span>(OLD) Get Involved</span></a>
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@ -472,13 +426,9 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/navpatterns/4-get-involved/patterns-authors/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedpatterns-authors><span>Patterns Authors</span></a>
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns-li>
<a href=/docs/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns><span>Template for writing Nav Design Patterns</span></a>
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@ -494,27 +444,14 @@ Solution Create a setup table to define which other tables you want to track cha
<a href=/docs/contributing/installhugo/manuallyonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugomanuallyonwindows11><span>Manually on Windows 11</span></a>
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<a href=/docs/contributing/installhugo/usingpowershellonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugousingpowershellonwindows11><span>Powershell on Windows 11</span></a>
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@ -522,173 +459,72 @@ Solution Create a setup table to define which other tables you want to track cha
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<h1>Observer</h1><header class=article-meta>
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<p><em>By Nikolai L&rsquo;Estrange, from TVision Technology Ltd. in the UK</em></p>
<h3 id=abstract>Abstract</h3>
<p>Track all record changes against a defined table or set of tables.</p>
<h3 id=problem>Problem</h3>
<p>Microsoft Dynamics NAV has the built in ability to track all record changes against any table, however it does not always fire the triggers for every table.</p>
<h3 id=solution>Solution</h3>
<p>Create a setup table to define which other tables you want to track changes for, and optionally what triggers you want to fire, then link this up to the standard triggers in Codeunit 1.</p>
<p>Codeunit 1 Application Management contains the triggers OnDatabaseInsert, OnDatabaseModify, OnDatabaseDelete and OnDatabaseRename which are what we need to subscribe to in order to track record changes. However these triggers are only fired sometimes. This is determined by the parameters set in the function GetTableTriggerSetup, which is called once per table per session.</p>
<p>In order to define which tables we are interested in we can create a new table with the following fields:</p>
<p><strong>Observable Table:</strong></p>
<table>
<h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms>
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<li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li></ul></div></header><p><em>By Nikolai L&rsquo;Estrange, from TVision Technology Ltd. in the UK</em></p><h3 id=abstract>Abstract</h3><p>Track all record changes against a defined table or set of tables.</p><h3 id=problem>Problem</h3><p>Microsoft Dynamics NAV has the built in ability to track all record changes against any table, however it does not always fire the triggers for every table.</p><h3 id=solution>Solution</h3><p>Create a setup table to define which other tables you want to track changes for, and optionally what triggers you want to fire, then link this up to the standard triggers in Codeunit 1.</p><p>Codeunit 1 Application Management contains the triggers OnDatabaseInsert, OnDatabaseModify, OnDatabaseDelete and OnDatabaseRename which are what we need to subscribe to in order to track record changes. However these triggers are only fired sometimes. This is determined by the parameters set in the function GetTableTriggerSetup, which is called once per table per session.</p><p>In order to define which tables we are interested in we can create a new table with the following fields:</p><p><strong>Observable Table:</strong></p><table>
<thead>
<tr>
<th>&ldquo;Table ID&rdquo;</th>
<th>Integer</th>
<th>Object.ID WHERE (Type=CONST(Table))</th>
</tr>
</thead>
<tbody>
<th>&ldquo;Table ID&rdquo;</th><th>Integer</th><th>Object.ID WHERE (Type=CONST(Table))</th></tr></thead><tbody>
<tr>
<td>TrackInsert</td>
<td>Boolean</td>
<td>[optional]</td>
</tr>
<tr>
<td>TrackModify</td>
<td>Boolean</td>
<td>[optional]</td>
</tr>
<tr>
<td>TrackDelete</td>
<td>Boolean</td>
<td>[optional]</td>
</tr>
<tr>
<td>TrackRename</td>
<td>Boolean</td>
<td>[optional]</td>
</tr>
</tbody>
</table>
<p>Then we can create a Codeunit that will set the Table Trigger Setup parameters and also subscribe to the OnDatabase triggers.</p>
<div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>GetTableTriggerSetup<span style=color:#ce5c00;font-weight:700>(</span>TableId<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#ce5c00;font-weight:700>)
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>GET<span style=color:#ce5c00;font-weight:700>(</span>TableId<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#000;font-weight:700>;</span>xRecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span></code></pre></div><p><em><strong>Note:</strong></em> In NAV2016 all these functions can be EventSubscribers that subscribe to the functions in Codeunit 1 as per above, in earlier versions of NAV these functions will need to be Global and called explicitly from within the Codeunit 1 functions.</p>
<h3 id=nav-usages>NAV Usages</h3>
<p>Variations of this pattern exists in the standard product in:</p>
<ul>
<li>Codeunit 423 Change Log Management</li>
<li>Codeunit 5150 Integration Management. In this Codeunit the tables that fire triggers are hardcoded in C/AL.</li>
</ul>
<h3 id=consequences>Consequences</h3>
<p>It is important that in our GetTableTriggerSetup function we only ever set the parameters to <strong>TRUE</strong>, and <strong>never</strong> set them to <strong>FALSE</strong>. This is because there may be other Codeunits listening to the triggers for that table, e.g. Change Log. This is also why we check the setup again within each trigger.</p>
<h3 id=related-topics>Related Topics</h3>
<p>This pattern was originally described in the following blog:</p>
<p><a href=https://geeknikolai.wordpress.com/2015/10/30/observer-pattern-in-dynamics-nav-2016/>https://geeknikolai.wordpress.com/2015/10/30/observer-pattern-in-dynamics-nav-2016/</a></p>
<h3 id=nav-versions>NAV Versions</h3>
<ul>
<li>From NAV 2016 use the code as shown</li>
<li>For earlier versions see <em>Note</em> above</li>
</ul>
<div class="text-muted mt-5 pt-3 border-top">
<td>TrackInsert</td><td>Boolean</td><td>[optional]</td></tr><tr>
<td>TrackModify</td><td>Boolean</td><td>[optional]</td></tr><tr>
<td>TrackDelete</td><td>Boolean</td><td>[optional]</td></tr><tr>
<td>TrackRename</td><td>Boolean</td><td>[optional]</td></tr></tbody></table><p>Then we can create a Codeunit that will set the Table Trigger Setup parameters and also subscribe to the OnDatabase triggers.</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>GetTableTriggerSetup<span style=color:#ce5c00;font-weight:700>(</span>TableId<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#ce5c00;font-weight:700>)
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>GET<span style=color:#ce5c00;font-weight:700>(</span>TableId<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TRUE<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseInsert<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackInsert<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseModify<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackModify<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseDelete<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackDelete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span></span></span><span style=display:flex><span><span style=color:#8f5902;font-style:italic></span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>[EventSubscriber]<span style=color:#f8f8f8;text-decoration:underline> </span>OnDatabaseRename<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#000;font-weight:700>;</span>xRecRef<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>RecordRef</span><span style=color:#ce5c00;font-weight:700>)
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>Get<span style=color:#ce5c00;font-weight:700>(</span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>NUMBER<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>AND</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observable<span style=color:#ce5c00;font-weight:700>.</span>TrackRename<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#8f5902;font-style:italic>//do something
</span></span></span></code></pre></div><p><em><strong>Note:</strong></em> In NAV2016 all these functions can be EventSubscribers that subscribe to the functions in Codeunit 1 as per above, in earlier versions of NAV these functions will need to be Global and called explicitly from within the Codeunit 1 functions.</p><h3 id=nav-usages>NAV Usages</h3><p>Variations of this pattern exists in the standard product in:</p><ul>
<li>Codeunit 423 Change Log Management</li><li>Codeunit 5150 Integration Management. In this Codeunit the tables that fire triggers are hardcoded in C/AL.</li></ul><h3 id=consequences>Consequences</h3><p>It is important that in our GetTableTriggerSetup function we only ever set the parameters to <strong>TRUE</strong>, and <strong>never</strong> set them to <strong>FALSE</strong>. This is because there may be other Codeunits listening to the triggers for that table, e.g. Change Log. This is also why we check the setup again within each trigger.</p><h3 id=related-topics>Related Topics</h3><p>This pattern was originally described in the following blog:</p><p><a href=https://geeknikolai.wordpress.com/2015/10/30/observer-pattern-in-dynamics-nav-2016/>https://geeknikolai.wordpress.com/2015/10/30/observer-pattern-in-dynamics-nav-2016/</a></p><h3 id=nav-versions>NAV Versions</h3><ul>
<li>From NAV 2016 use the code as shown</li><li>For earlier versions see <em>Note</em> above</li></ul><div class="text-muted mt-5 pt-3 border-top">
Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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