Dynamics AX 2012 Pricing and Licencing information

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The Dynamics AX 2012 Pricing and Licencing information in draft format is now available on partner source here (Partnersource credentials required)

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The field with ID '0' does not exist in table - Cause and resolution.

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Hello readers, In Dynamics AX coding, you should have come across this error sometime - The field with ID '0' does not exist in table 'SomeTable' So what causes this error and what is the possible resolution to it? Well, the most likely cause for this error is a missing mapping in a table map. Let us look at an example. I've a simple Map named CustVendAccount with one Account field. I've created two mappings - one with CustTable's AccountNum field and for the otehr mapping, I just specify VendTable but no field. This is how my map looks like, Now, I've a simple job which just passes either CustTable or VendTable as an argument and then we print the Account field in the map. static void CustVendAccountMap(Args _args) { CustTable custTable; VendTable vendTable; void readMap(CustVendAccount _custVendAccount) { info(strFmt("Value from table %1 is %2",tableId2name(_custVendAccount.TableId), _custV...
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SysQuery::findOrCreateRange() - A better way to create dynamic query ranges

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When creating dynamic query ranges in X++, it is considered a best practice to create a range only if it has not been already created. I have seen examples of code where the addRange() method is called inside an executeQuery() method. This has a performance hit and should be avoided. The best approach is to create the range in the init() of the datasource. In the executeQuery(), we can find the range first, if it does not exists or has not been created at that point, create a new one and apply the values. I found a helper method on the SysQuery class which did exactly this. The method is SysQuery::findOrCreateRange(). The method takes two parameters, a datasource to add the range to and the range itself. It returns a range object.
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How to add empty ranges in query

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In Dynamics AX programming, a common mistake I have seen when it comes to query ranges is passing an empty string value to the range. The developer here is expecting it to show all the records where the range field is empty. Instead, what we get is all records without the range being applied. As baffling as it may seems, it is easily explainable. The query engine in Dynamics AX, will not add a range if you don’t specify a value or if you specify an empty string because an empty string is treated as no value. So the following code will result in this SQL statement, query = new Query(); qbds = query.addDataSource(tableNum(ProjTable)); qbr = qbds.addRange(fieldNum(ProjTable, Name)); qbr.value(''); Select first fast * from ProjTable; But what was expected was something like, Select first fast * from ProjTable where Name == ''; So to work around this issue, use the SysQuery::valueEmptyString() static method which parses the empty strings correctly so that it...
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