Clase de QueryExpression
Se aplica a: CRM 2015 on-prem, CRM Online
Contains a complex query expressed in a hierarchy of expressions.
Espacio de nombres: Microsoft.Xrm.Sdk.Query
Ensamblado: Microsoft.Xrm.Sdk (en Microsoft.Xrm.Sdk.dll)
Sintaxis
'Declaración
<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
Ejemplo
// 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();
Comentarios
A query expression can be expressed as FetchXML or as a hierarchy of expressions.
Jerarquía heredada
System.Object
Microsoft.Xrm.Sdk.Query.QueryBase
Microsoft.Xrm.Sdk.Query.QueryExpression
Seguridad de hilo
Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para el hilo. No se garantiza que los miembros de instancia sean seguros para el hilo.
Plataformas
Plataformas de desarrollo
Windows Vista, Windows Server 2003 y
Plataformas de destino
Windows Vista,Windows XP
Change History
Vea también
Referencia
Miembros de QueryExpression
Espacio de nombres de Microsoft.Xrm.Sdk.Query
Otros recursos
Build Queries with QueryExpression
Sample: Retrieve Multiple with Query Expression
Sample: Query Connection Roles by Entity Type Code (Early Bound)
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