How do you create a new query in X++?

X++ Programming Language >   Data Selection and Manipulation >   Database Operation Introduction  

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Answer:

How do you create a new query in X++?

In X++, you can create a new query by using the Query class and the related classes provided by the Microsoft Dynamics AX framework. Here's an example of how you might create a new query to retrieve all the records from the "CustTable" table:

Query query = new Query();
QueryBuildDataSource qbds = query.addDataSource(tableNum(CustTable));
 

You can then add other tables to the query by using the addDataSource method, and you can add links between the tables by using the addLink method. You can also specify the fields that you want to retrieve by using the addRange method.

Here's an example of how you might create a query that retrieves all customers and their related sales orders:

Query query = new Query();
QueryBuildDataSource qbdsCust = query.addDataSource(tableNum(CustTable));
QueryBuildDataSource qbdsSO = query.addDataSource(tableNum(SalesTable));
query.addLink(fieldNum(CustTable, AccountNum), fieldNum(SalesTable, AccountNum));
 

Once you have created the query, you can use the QueryRun class to execute the query and retrieve the results. Here's an example of how you might execute the query and retrieve the results:

QueryRun queryRun = new QueryRun(query);
while(queryRun.next())
{
 CustTable custTable = queryRun.get(tableNum(CustTable));
 info(custTable.AccountNum);
 SalesTable salesTable;
 while (queryRun.get(tableNum(SalesTable)).next())
 {
 salesTable = queryRun.get(tableNum(SalesTable));
 info(salesTable.SalesId);
 }
}

It's worth noting that you can also add conditions to the query by using the addRange method, and you can specify the sorting order by using the orderBy method. The Query class also has other methods that can be used to add sorting, grouping, and aggregate functionality to your query. It's important to test your query and ensure that it performs well, and that you are retrieving only the necessary data.

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