Walkthrough: Using the Query Service to Query Tables in a Hierarchy [AX 2012]

Updated: August 27, 2010

Applies To: Microsoft Dynamics AX 2012 R2, Microsoft Dynamics AX 2012 Feature Pack, Microsoft Dynamics AX 2012

This walkthrough shows you how to call the query service and retrieve data from tables that implement table inheritance in Microsoft Dynamics AX. When the query service returns data from tables that are part of a table hierarchy, it returns the data for the base table and for each table that derives from the base table in DataTable objects in a single DataSet. The records in the base DataTable are related to the derived DataTables through DataRelation objects. For more information about table inheritance, see Walkthrough: Creating Base and Derived Tables.

This walkthrough illustrates the following tasks:

  • Add a reference to the query service.

  • Call the query service and return data from hierarchical tables.

To complete this walkthrough, you will need:

  • Microsoft Dynamics AX 2012

  • Visual Studio 2008

  • To have created the tables and query in the Hierarchical Tables, Data and Query section of the topic Creating Query Service Test Data

In order to call the query service, you must first create a project in Visual Studio and add a reference to the service.

To add a reference to the query service

  1. Open Visual Studio and create a new project by selecting File > New Project.

  2. In the Project types tree, select Visual C# > Windows and then click the Console Application template.

  3. Type a project name such as QueryServiceTableInheritanceTest and then click OK.

  4. In Solution Explorer, right-click References and select Add Service Reference.

  5. In the Address Field, enter the URL of the service. For example, http://localhost:8101/DynamicsAx/Services/QueryService.

  6. Click Go. In the Services tree, you should see the QueryService.

  7. Type QueryServiceReference in the Namespace field and then click OK.

Now we will write the code that calls the query service and returns the data specified by the PartiesInWA query.

To call the query service

  1. In Solution Explorer, double-click Program.cs.

  2. In the Program.cs file, add the following using statements.

    using System;
    using System.Data;
    using QueryServiceTableInheritanceTest.QueryServiceReference;
    
  3. In the Main method, add the code to call the query service. The Program.cs file should contain the following code.

    using System;
    using System.Data;
    using QueryServiceTableInheritanceTest.QueryServiceReference;
    
    namespace QueryServiceTableInheritanceTest
    {
        class Program
        {
            static void Main(string[] args)
            {
                QueryServiceClient client = new QueryServiceClient();
    
                DataSet dataSet;
                DataTable party;
                Paging paging = null;
    
                // Call the query service with the query name.
                dataSet = client.ExecuteStaticQuery("TestPartiesInWA", ref paging);
    
                // Get the base table Party.
                party = dataSet.Tables["TestParty.TestParty"];
                string strParty = "";
    
                if (party != null && party.Rows.Count > 0)
                {
                    // Loop through each record in Party. 
                    foreach (DataRow row in party.Rows)
                    {
                        strParty = "";
                        // Get the rows from the TestOrganization table through the table relation.
                        DataRow[] childrows = row.GetChildRows("TestParty.TestParty_TestParty.TestOrganization");
                        foreach (DataRow childrow in childrows)
                        {
                            strParty = row["Name"] + "\t" + row["City"] + "\t" + row["StateProvince"] + 
                                "\t" + row["Email"] + "\t" + childrow["DUNSNumber"];
                        }
                        // Get the rows from the TestPerson table through the table relation.
                        childrows = row.GetChildRows("TestParty.TestParty_TestParty.TestPerson");
                        foreach (DataRow childrow in childrows)
                        {
                            strParty = childrow["FirstName"] + " " + childrow["LastName"] + "\t" + row["City"] + 
                                "\t" + row["StateProvince"] + "\t" + row["Email"] + "\t" +
                                DateTime.Parse(childrow["BirthDate"].ToString()).ToShortDateString();
                        }
                        // Display the organization or person data.
                        Console.WriteLine(strParty);
                    }
                }
                else
                {
                    Console.WriteLine("No records returned in Party table.");
                }
    
                Console.ReadLine();
            }
        }
    }
    
    
  4. Run the program. This code calls the query service and passes in the name of the PartiesInWA static query. The code loops through the records in the base table, and for each record, there will be either a related person record or an organization record. Each party returned by the query is displayed to the console. The output resembles the following:

    Northwind Traders        Seattle        WA        info@northwind.com          123456789

    Molly Clark              Bellevue       WA        molly@hotmail.com           2/23/1968

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