Building SQL Query using Query Expression programmatically

Today we will see how to query the data in ms crm similar to a SQL Query using Query Expression.

// Build the following SQL query using QueryExpression:
// SQL Query:
//		SELECT contact.fullname, contact.address1_telephone1
//		FROM contact
//			LEFT OUTER JOIN account
//				ON contact.parentcustomerid = account.accountid
//				AND
// = 'Litware, Inc.'
//		WHERE (contact.address1_stateorprovince = 'WA'
//		AND
//			contact.address1_city in ('Redmond', 'Bellevue', 'Kirkland', 'Seattle')
//		AND 
//			contact.address1_telephone1 like '(206)%'
//			OR
//			contact.address1_telephone1 like '(425)%'
//		AND
//			DATEDIFF(DAY, contact.createdon, GETDATE()) > 0
//		AND
//			DATEDIFF(DAY, contact.createdon, GETDATE()) < 30
//		AND
//			contact.emailaddress1 Not NULL
//			   )

Similar Query using QueryExpression:
QueryExpression query = new QueryExpression()
    Distinct = false,
    EntityName = Contact.EntityLogicalName,
    ColumnSet = new ColumnSet("fullname", "address1_telephone1"),
    LinkEntities = 
        new LinkEntity 
            JoinOperator = JoinOperator.LeftOuter,
            LinkFromAttributeName = "parentcustomerid",
            LinkFromEntityName = Contact.EntityLogicalName,
            LinkToAttributeName = "accountid",
            LinkToEntityName = Account.EntityLogicalName,
            LinkCriteria = 
                Conditions = 
                    new ConditionExpression("name", ConditionOperator.Equal, "Litware, Inc.")
    Criteria =
        Filters = 
            new FilterExpression
                FilterOperator = LogicalOperator.And,
                Conditions = 
                    new ConditionExpression("address1_stateorprovince", ConditionOperator.Equal, "WA"),
                    new ConditionExpression("address1_city", ConditionOperator.In, new String[] {"Redmond", "Bellevue" , "Kirkland", "Seattle"}),
                    new ConditionExpression("createdon", ConditionOperator.LastXDays, 30),
                    new ConditionExpression("emailaddress1", ConditionOperator.NotNull)
            new FilterExpression
                FilterOperator = LogicalOperator.Or,
                Conditions =
                    new ConditionExpression("address1_telephone1", ConditionOperator.Like, "(206)%"),
                    new ConditionExpression("address1_telephone1", ConditionOperator.Like, "(425)%")

DataCollection<Entity> entityCollection = _service.RetrieveMultiple(query).Entities;

// Display the results.
Console.WriteLine("List all contacts matching specified parameters");
foreach (Contact contact in entityCollection)
    Console.WriteLine("Contact ID: {0}", contact.Id);
    Console.WriteLine("Contact Name: {0}", contact.FullName);
    Console.WriteLine("Contact Phone: {0}", contact.Address1_Telephone1);
Console.WriteLine("<End of Listing>");

Author: Pavan Mani Deep Y

Technology geek who loves sharing my leanings, quick tips and new features on Dynamics 365 & related tools, technologies. An Azure IOT Enthusiast....

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