Classe QueryExpression

Article
12/01/2014

S'applique à: CRM 2015 on-prem, CRM Online

Contains a complex query expressed in a hierarchy of expressions.

Espace de noms: Microsoft.Xrm.Sdk.Query
Assembly: Microsoft.Xrm.Sdk (dans Microsoft.Xrm.Sdk.dll)

Syntaxe

'Déclaration
<DataContractAttribute(Name:="QueryExpression", Namespace:="https://schemas.microsoft.com/xrm/2011/Contracts")> _
Public NotInheritable Class QueryExpression
    Inherits QueryBase

[DataContractAttribute(Name="QueryExpression", Namespace="https://schemas.microsoft.com/xrm/2011/Contracts")] 
public sealed class QueryExpression : QueryBase

Exemple

// Build the following SQL query using QueryExpression:
//
//        SELECT contact.fullname, contact.address1_telephone1
//        FROM contact
//            LEFT OUTER JOIN account
//                ON contact.parentcustomerid = account.accountid
//                AND
//                account.name = '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
//               )

String fetchXml = @"<fetch mapping=""logical"" count=""50"" version=""1.0"">
                        <entity name=""contact"">
                            <attribute name=""address1_telephone1"" />
                            <attribute name=""contactid"" />
                            <attribute name=""firstname"" />
                            <attribute name=""lastname"" />
                            <filter>
                                <condition attribute=""address1_stateorprovince"" operator=""eq"" value=""WA"" />
                                <condition attribute=""address1_city"" operator=""in"">
                                    <value>Redmond</value>
                                    <value>Bellevue</value>
                                    <value>Kirkland</value>
                                    <value>Seattle</value>
                                </condition>
                                <condition attribute=""createdon"" operator=""last-x-days"" value=""30"" />
                                <condition attribute=""emailaddress1"" operator=""not-null"" />
                                <filter type=""or"">
                                    <condition attribute=""address1_telephone1"" operator=""like"" value=""(206)%"" />
                                    <condition attribute=""address1_telephone1"" operator=""like"" value=""(425)%"" />
                                </filter>
                            </filter>
                            <link-entity name=""account"" from=""accountid"" to=""parentcustomerid"">
                                <filter>
                                    <condition attribute=""name"" operator=""eq"" value=""Litware, Inc."" />
                                </filter>
                            </link-entity>
                        </entity>
                    </fetch>";

// Build fetch request and obtain results.
RetrieveMultipleRequest efr = new RetrieveMultipleRequest()
{
    Query = new FetchExpression(fetchXml)
};

EntityCollection entityResults = ((RetrieveMultipleResponse)_service.Execute(efr)).EntityCollection;
 

// Display the results.
Console.WriteLine("List all contacts matching specified parameters");
Console.WriteLine("===============================================");
foreach (var e in entityResults.Entities)
{
    Console.WriteLine("Contact ID: {0}", e.Id);
}


Console.WriteLine("<End of Listing>");
Console.WriteLine();

// Build the following SQL query using QueryExpression:
//
//        SELECT contact.fullname, contact.address1_telephone1
//        FROM contact
//            LEFT OUTER JOIN account
//                ON contact.parentcustomerid = account.accountid
//                AND
//                account.name = '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
//               )

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");
Console.WriteLine("===============================================");
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>");
Console.WriteLine();

Remarques

A query expression can be expressed as FetchXML or as a hierarchy of expressions.

Hiérarchie d'héritage

System.Object
Microsoft.Xrm.Sdk.Query.QueryBase
Microsoft.Xrm.Sdk.Query.QueryExpression

Cohérence de thread

Tous les membres statiques publics (Shared dans Visual Basic) de ce type sont thread-safe. Tous les membres d'instance ne sont pas garantis thread-safe.

Plateformes

Plateformes de développement

Windows Vista, Windows Server 2003 et

Plateformes cibles

Windows Vista,Windows XP

Change History

Voir aussi

Référence

Membres QueryExpression
Espace de noms Microsoft.Xrm.Sdk.Query

Autres ressources

Build Queries with QueryExpression
Sample: Retrieve Multiple with Query Expression
Sample: Query Connection Roles by Entity Type Code (Early Bound)

Partager via