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docs/navpatterns/patterns/read-once-initialization-and-validation/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">
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@ -14,8 +14,7 @@
<link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96>
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<title>Read-once Initialization and Validation | alguidelines.dev - Business Central Design Patterns</title>
<meta name=description content="By Tim Grant
<title>Read-once Initialization and Validation | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Tim Grant
Abstract
One time query and validation of a setup table.
Description
@ -46,8 +45,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity>
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@ -59,36 +57,24 @@ If you need to query a setup table, but not sure if the table is yet in memory f
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<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>
@ -106,9 +92,9 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -155,9 +141,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -172,9 +156,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -229,9 +211,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -240,9 +220,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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" id=m-docsnavpatternspatternsobserver-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li>
<a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span>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>
@ -257,9 +235,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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 active-path" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child active-path" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
<a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 active td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span class=td-sidebar-nav-active-item>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>
@ -278,9 +254,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -296,11 +270,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -310,18 +280,14 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
@ -355,18 +321,14 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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">
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@ -379,9 +341,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
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<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>
@ -448,9 +408,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
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@ -461,11 +419,7 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
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<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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@ -474,13 +428,9 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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>
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@ -496,27 +446,14 @@ If you need to query a setup table, but not sure if the table is yet in memory f
<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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@ -524,111 +461,33 @@ If you need to query a setup table, but not sure if the table is yet in memory f
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<h1>Read-once Initialization and Validation</h1><header class=article-meta>
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<p><em>By Tim Grant</em></p>
<h2 id=abstract>Abstract</h2>
<p>One time query and validation of a setup table.</p>
<h2 id=description>Description</h2>
<p>Firstly identifies if a setup table record is in memory, removing the need to execute and validate the re-query again within a code unit. (From NAV 2013+ service tier database caching exists).</p>
<p>If you need to query a setup table, but not sure if the table is yet in memory from earlier code, this helps to determine this call (see Singleton Table pattern).</p>
<p>Allows a central function to validate critical fields before processing automated code. <strong>TESTFIELD</strong> calls are added to the function and not the INIT call in order to ensure that critical functions do not run without this human check in place as these may rely on key configuration. If you have a design where specific field values are critical (custom or standard) for integrity, then INIT INSERT is a dangerous default which could result in the corruption of processes. This is separate automated INIT INSERT from a setup page.</p>
<h2 id=nav-specific-example>NAV Specific Example</h2>
<p>A global variable record and a global status indicator, but within the context of a local function.</p>
<p><a href=6332.1.png><img src=6332.1.png alt=" "></a></p>
<p><a href=5025.2.png><img src=5025.2.png alt=" "></a></p>
<p><img src=5672.8.png alt=" "></p>
<h2 id=nav-usages>NAV Usages</h2>
<p>A similar example of this is in Codeunit 80, but without any validation.</p>
<p><a href=4.png><img src=4.png alt=" "></a></p>
<p>E.g. If there is a bespoke change, then this existing <strong>GetGLSetup</strong> can be called earlier to accommodate for an earlier bespoke change:</p>
<p><a href=5.png></a><a href=2465.5.png><img src=2465.5.png alt=" "></a></p>
<p>This means that by the time the code reaches the original <strong>GetGLSetup</strong> code requirement, this record is already in memory as the status flag is set to True, eliminating another check. For such Patterns the setup record should never be cleared, it should be called once globally, initiated and left in memory for future checks. It should <strong>not</strong> be declared locally at the same time, review your code for matching local variable usage before implementing this.</p>
<h2 id=ideas-for-improvement>Ideas for improvement</h2>
<p>Merge <strong>Singleton Table</strong> with dynamic validation field meta configuration. This removes the coding of <strong>TESTFIELD</strong> to a central setup check.</p>
<p>Example with the <strong>Sales & Receivables Setup</strong></p>
<p><a href=5857.1.png><img src=5857.1.png alt=" "></a></p>
<p><a href=4477.2.png><img src=4477.2.png alt=" "></a></p>
<p><a href=4314.3.png><img src=4314.3.png alt=" "></a></p>
<h2 id=consequences>Consequences</h2>
<p>If in the circumstance that a field value in the setup table is expected to change within the life of the code component instance. e.g. If a CHANGECOMPANY is required to cross reference another Setup table, use a separate variable.</p>
<h2 id=related-topics>Related Topics</h2>
<p>This is related to the <strong>Singleton Table</strong> pattern.</p>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div><div class="taxonomy taxonomy-terms-article taxo-categories">
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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 Tim Grant</em></p><h2 id=abstract>Abstract</h2><p>One time query and validation of a setup table.</p><h2 id=description>Description</h2><p>Firstly identifies if a setup table record is in memory, removing the need to execute and validate the re-query again within a code unit. (From NAV 2013+ service tier database caching exists).</p><p>If you need to query a setup table, but not sure if the table is yet in memory from earlier code, this helps to determine this call (see Singleton Table pattern).</p><p>Allows a central function to validate critical fields before processing automated code. <strong>TESTFIELD</strong> calls are added to the function and not the INIT call in order to ensure that critical functions do not run without this human check in place as these may rely on key configuration. If you have a design where specific field values are critical (custom or standard) for integrity, then INIT INSERT is a dangerous default which could result in the corruption of processes. This is separate automated INIT INSERT from a setup page.</p><h2 id=nav-specific-example>NAV Specific Example</h2><p>A global variable record and a global status indicator, but within the context of a local function.</p><p><a href=6332.1.png><img src=6332.1.png alt=" "></a></p><p><a href=5025.2.png><img src=5025.2.png alt=" "></a></p><p><img src=5672.8.png alt=" "></p><h2 id=nav-usages>NAV Usages</h2><p>A similar example of this is in Codeunit 80, but without any validation.</p><p><a href=4.png><img src=4.png alt=" "></a></p><p>E.g. If there is a bespoke change, then this existing <strong>GetGLSetup</strong> can be called earlier to accommodate for an earlier bespoke change:</p><p><a href=5.png></a><a href=2465.5.png><img src=2465.5.png alt=" "></a></p><p>This means that by the time the code reaches the original <strong>GetGLSetup</strong> code requirement, this record is already in memory as the status flag is set to True, eliminating another check. For such Patterns the setup record should never be cleared, it should be called once globally, initiated and left in memory for future checks. It should <strong>not</strong> be declared locally at the same time, review your code for matching local variable usage before implementing this.</p><h2 id=ideas-for-improvement>Ideas for improvement</h2><p>Merge <strong>Singleton Table</strong> with dynamic validation field meta configuration. This removes the coding of <strong>TESTFIELD</strong> to a central setup check.</p><p>Example with the <strong>Sales & Receivables Setup</strong></p><p><a href=5857.1.png><img src=5857.1.png alt=" "></a></p><p><a href=4477.2.png><img src=4477.2.png alt=" "></a></p><p><a href=4314.3.png><img src=4314.3.png alt=" "></a></p><h2 id=consequences>Consequences</h2><p>If in the circumstance that a field value in the setup table is expected to change within the life of the code component instance. e.g. If a CHANGECOMPANY is required to cross reference another Setup table, use a separate variable.</p><h2 id=related-topics>Related Topics</h2><p>This is related to the <strong>Singleton Table</strong> pattern.</p><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>
by waldo1001
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