Microsoft Dynamics AX – Option for More Flexible ‘Where Clause’ in Select Statements

By Eric Meissner | February 19, 2015

When working on a Dynamics AX R3 upgrade I noticed some code around a 'where clause' that I had not seen before. I discussed it with some other team members and they never thought of doing it this way as well, so I thought it would be something good to document. There might be a scenario where using macros can be beneficial when building a where clause.  An example would be if there is a specific filter or join that will be used within multiple where clauses of a class. Using the macro will help simply the code and reduce the number of lines in the code.  It also would come in useful if anything had to be changed or added in the where clause. Instead of having to make the change in each of the methods that have the select statement you can just make one change in the class declaration of the class.

An example on how this is used in AX is in the PriceDiscAdm class. In the classDeclaration you will see a bunch of macros for the filters and joins. There are a lot of methods that start with ‘search’ for customers, vendors, and items. These methods will have select statements that utilize these macros.  The macros were a benefit for me because I had to make additions to the PriceDiscFilter macro. I only had to make the addition in one spot instead of each of the ten methods. It also reduces about twenty lines of code for each select statement. Below is some of the code that utilizes this functionality.  It just might come in handy in the future for someone.

&& ((prices && priceDiscTable.Relation == PriceType::PriceSales)
|| (lineDiscounts && priceDiscTable.Relation == PriceType::LineDiscSales)
|| (multiLineDiscounts && priceDiscTable.Relation == PriceType::MultiLineDiscSales)
|| (endDiscounts && priceDiscTable.Relation == PriceType::EndDiscSales)
|| (this.findPurchPriceDisc()
&& ((prices && priceDiscTable.Relation == PriceType::PricePurch)
|| (lineDiscounts && priceDiscTable.Relation == PriceType::LineDiscPurch)
|| (multiLineDiscounts &&priceDiscTable.Relation == PriceType::MultiLineDiscPurch)
|| (endDiscounts && priceDiscTable.Relation == PriceType::EndDiscPurch)

(!currencyCode || (priceDiscTable.Currency == currencyCode)
|| (genericCurrency && priceDiscTable.GenericCurrency))

join JournalNum from PriceDiscAdmTable
where priceDiscAdmTable.JournalNum == journalNum

((priceDiscTable.FromDate <= toDate || !toDate)
&& (priceDiscTable.ToDate >= fromDate || !priceDiscTable.ToDate))

method searchCustAllAdditionalRelations
protected void searchCustAllAdditionalRelations(AgreementHeaderExtRecId_RU  _agreementHeaderExtRecId)
CustTable custTable;

insert_recordset priceDiscTableRefTmp
(PriceDiscTableRefRecId , PriceDiscJournalNum)
select custTable
join RecId from priceDiscTable
where   priceDiscTable.AccountCode      == BPFPriceDiscCustObjectTableGroupAll::Table
&&  (priceDiscTable.AccountRelation  == custTable.AccountNum)
&& ((priceDiscTable.Relation         >= PriceType::PriceSales)
&& (priceDiscTable.Relation <= PriceType::EndDiscSales))
&& #PriceDiscFilter
&& #DateFilter
&& #CurrencyFilter
&& #RU_Filter


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