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Method-Based Sorgu Söz Dizimi Örnekleri: Birleştirme İşleçleri

Bu konudaki örnekler, yöntem tabanlı sorgu söz dizimini kullanarak Join sorgulamak için GroupJoin ve yöntemlerinin nasıl kullanılacağını göstermektedir. Bu örneklerde kullanılan AdventureWorks Satış Modeli, AdventureWorks örnek veritabanındaki Contact, Address, Product, SalesOrderHeader ve SalesOrderDetail tablolarından oluşturulur.

Bu konudaki örneklerde aşağıdaki using/Imports deyimleri kullanılır:

using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Objects;
using System.Globalization;
using System.Data.EntityClient;
using System.Data.SqlClient;
using System.Data.Common;


Option Explicit On
Option Strict On
Imports System.Data.Objects
Imports System.Globalization

GrupBirleştir

Örnek

Aşağıdaki örnek, müşteri başına sipariş sayısını bulmak için SalesOrderHeader ve SalesOrderDetail tabloları üzerinde bir GroupJoin gerçekleştirir. Grup birleşimi, diğer veri kaynağında ilişkilendirilmiş öğe olmasa bile, ilk (sol) veri kaynağının her bir öğesini döndüren sol dış birleşimin karşılığıdır.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    ObjectSet<SalesOrderHeader> orders = context.SalesOrderHeaders;
    ObjectSet<SalesOrderDetail> details = context.SalesOrderDetails;

    var query = orders.GroupJoin(details,
        order => order.SalesOrderID,
        detail => detail.SalesOrderID,
        (order, orderGroup) => new
        {
            CustomerID = order.SalesOrderID,
            OrderCount = orderGroup.Count()
        });

    foreach (var order in query)
    {
        Console.WriteLine($"CustomerID: {order.CustomerID}  Orders Count: {order.OrderCount}");
    }
}

Using context As New AdventureWorksEntities
    Dim orders As ObjectSet(Of SalesOrderHeader) = context.SalesOrderHeaders
    Dim details As ObjectSet(Of SalesOrderDetail) = context.SalesOrderDetails

    Dim query = orders.GroupJoin(details, _
            Function(order) order.SalesOrderID, _
            Function(detail) detail.SalesOrderID, _
            Function(order, orderGroup) New With _
            { _
                .CustomerID = order.SalesOrderID, _
                .OrderCount = orderGroup.Count() _
            })

    For Each order In query
        Console.WriteLine("CustomerID: {0}  Orders Count: {1}", _
            order.CustomerID, order.OrderCount)
    Next

End Using

Örnek

Aşağıdaki örnek, kişi başına sipariş sayısını bulmak için Contact ve SalesOrderHeader tabloları üzerinde bir GroupJoin gerçekleştirir. Her bir iletişim için sipariş sayısı ve kimlik numaraları görüntülenir.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    ObjectSet<Contact> contacts = context.Contacts;
    ObjectSet<SalesOrderHeader> orders = context.SalesOrderHeaders;

    var query = contacts.GroupJoin(orders,
        contact => contact.ContactID,
        order => order.Contact.ContactID,
        (contact, contactGroup) => new
        {
            ContactID = contact.ContactID,
            OrderCount = contactGroup.Count(),
            Orders = contactGroup
        });

    foreach (var group in query)
    {
        Console.WriteLine($"ContactID: {group.ContactID}");
        Console.WriteLine($"Order count: {group.OrderCount}");
        foreach (var orderInfo in group.Orders)
        {
            Console.WriteLine($"   Sale ID: {orderInfo.SalesOrderID}");
        }
        Console.WriteLine("");
    }
    }

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts
    Dim orders As ObjectSet(Of SalesOrderHeader) = context.SalesOrderHeaders

    Dim query = contacts.GroupJoin(orders, _
            Function(contact) contact.ContactID, _
            Function(order) order.Contact.ContactID, _
            Function(contact, contactGroup) New With _
            { _
                .ContactID = contact.ContactID, _
                .OrderCount = contactGroup.Count(), _
                .orders = contactGroup.Select(Function(order) order) _
            })

    For Each group In query
        Console.WriteLine("ContactID: {0}", group.ContactID)
        Console.WriteLine("Order count: {0}", group.OrderCount)

        For Each orderInfo In group.orders
            Console.WriteLine("   Sale ID: {0}", orderInfo.SalesOrderID)
        Next

        Console.WriteLine("")
    Next
End Using

Katılın

Örnek

Aşağıdaki örnek Contact ve SalesOrderHeader tabloları üzerinden birleştirme gerçekleştirir.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    ObjectSet<Contact> contacts = context.Contacts;
    ObjectSet<SalesOrderHeader> orders = context.SalesOrderHeaders;

    var query =
        contacts.Join(
            orders,
            order => order.ContactID,
            contact => contact.Contact.ContactID,
            (contact, order) => new
            {
                ContactID = contact.ContactID,
                SalesOrderID = order.SalesOrderID,
                FirstName = contact.FirstName,
                Lastname = contact.LastName,
                TotalDue = order.TotalDue
            });

    foreach (var contact_order in query)
    {
        Console.WriteLine($"ContactID: {contact_order.ContactID} "
                        + "SalesOrderID: {contact_order.SalesOrderID} "
                        + "FirstName: {contact_order.FirstName} "
                        + "Lastname: {contact_order.Lastname} "
                        + "TotalDue: {contact_order.TotalDue}");
    }
}

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts
    Dim orders As ObjectSet(Of SalesOrderHeader) = context.SalesOrderHeaders

    Dim query = _
        contacts.Join( _
            orders, _
            Function(ord) ord.ContactID, _
            Function(cont) cont.Contact.ContactID, _
            Function(cont, ord) New With _
                { _
                    .ContactID = cont.ContactID, _
                    .SalesOrderID = ord.SalesOrderID, _
                    .FirstName = cont.FirstName, _
                    .Lastname = cont.LastName, _
                    .TotalDue = ord.TotalDue _
                })

    For Each contact_order In query
        Console.WriteLine("ContactID: {0} " _
            & "SalesOrderID: {1} " & "FirstName: {2} " _
            & "Lastname: {3} " & "TotalDue: {4}", _
            contact_order.ContactID, _
            contact_order.SalesOrderID, _
            contact_order.FirstName, _
            contact_order.Lastname, _
            contact_order.TotalDue)
    Next
End Using

Örnek

Aşağıdaki örnek, Sonuçları kişi kimliğine göre gruplandırarak Contact ve SalesOrderHeader tabloları üzerinde birleştirme gerçekleştirir.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    ObjectSet<Contact> contacts = context.Contacts;
    ObjectSet<SalesOrderHeader> orders = context.SalesOrderHeaders;

    var query = contacts.Join(
        orders,
        order => order.ContactID,
        contact => contact.Contact.ContactID,
        (contact, order) => new
        {
            ContactID = contact.ContactID,
            SalesOrderID = order.SalesOrderID,
            FirstName = contact.FirstName,
            Lastname = contact.LastName,
            TotalDue = order.TotalDue
        })
            .GroupBy(record => record.ContactID);

    foreach (var group in query)
    {
        foreach (var contact_order in group)
        {
            Console.WriteLine($"ContactID: {contact_order.ContactID} "
                            + "SalesOrderID: {contact_order.SalesOrderID} "
                            + "FirstName: {contact_order.FirstName} "
                            + "Lastname: {contact_order.Lastname} "
                            + "TotalDue: {contact_order.TotalDue}");
        }
    }
}

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts
    Dim orders As ObjectSet(Of SalesOrderHeader) = context.SalesOrderHeaders

    Dim query = _
        contacts.Join( _
            orders, _
            Function(ord) ord.ContactID, _
            Function(cont) cont.Contact.ContactID, _
            Function(cont, ord) New With _
                { _
                    .ContactID = cont.ContactID, _
                    .SalesOrderID = ord.SalesOrderID, _
                    .FirstName = cont.FirstName, _
                    .Lastname = cont.LastName, _
                    .TotalDue = ord.TotalDue _
                }) _
                .GroupBy(Function(record) record.ContactID)

    For Each group In query
        For Each contact_order In group
            Console.WriteLine("ContactID: {0} " _
                & "SalesOrderID: {1} " & "FirstName: {2} " _
                & "Lastname: {3} " & "TotalDue: {4}", _
                contact_order.ContactID, _
                contact_order.SalesOrderID, _
                contact_order.FirstName, _
                contact_order.Lastname, _
                contact_order.TotalDue)
        Next
    Next
End Using

Ayrıca bkz.