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Cara: Membangun String Koneksi EntityConnection

  • Artikel

Topik ini memberikan contoh cara membuat EntityConnection.

Untuk menjalankan kode dalam contoh ini

  1. Tambahkan AdventureWorks Sales Model ke proyek Anda dan konfigurasikan proyek Anda untuk menggunakan Entity Framework. Untuk informasi selengkapnya, lihat Cara: Menggunakan Wizard Model Data Entitas.

  2. Di halaman kode untuk aplikasi Anda, tambahkan pernyataan using berikut (Imports dalam Visual Basic):

    using System;
using System.Collections.Generic;
using System.Collections;
using System.Data.Common;
using System.Data;
using System.IO;
using System.Data.SqlClient;
using System.Data.EntityClient;
using System.Data.Metadata.Edm;

    Imports System.Collections.Generic
Imports System.Collections
Imports System.Data.Common
Imports System.Data
Imports System.IO
Imports System.Data.SqlClient
Imports System.Data.EntityClient
Imports System.Data.Metadata.Edm

Contoh

Contoh berikut menginisialisasi System.Data.SqlClient.SqlConnectionStringBuilder bagi penyedia yang mendasarinya, kemudian menginisialisasi objek System.Data.EntityClient.EntityConnectionStringBuilder dan meneruskan objek ini ke konstruktor EntityConnection.


// Specify the provider name, server and database.
string providerName = "System.Data.SqlClient";
string serverName = ".";
string databaseName = "AdventureWorks";

// Initialize the connection string builder for the
// underlying provider.
SqlConnectionStringBuilder sqlBuilder =
    new SqlConnectionStringBuilder();

// Set the properties for the data source.
sqlBuilder.DataSource = serverName;
sqlBuilder.InitialCatalog = databaseName;
sqlBuilder.IntegratedSecurity = true;

// Build the SqlConnection connection string.
string providerString = sqlBuilder.ToString();

// Initialize the EntityConnectionStringBuilder.
EntityConnectionStringBuilder entityBuilder =
    new EntityConnectionStringBuilder();

//Set the provider name.
entityBuilder.Provider = providerName;

// Set the provider-specific connection string.
entityBuilder.ProviderConnectionString = providerString;

// Set the Metadata location.
entityBuilder.Metadata = @"res://*/AdventureWorksModel.csdl|
                            res://*/AdventureWorksModel.ssdl|
                            res://*/AdventureWorksModel.msl";
Console.WriteLine(entityBuilder.ToString());

using (EntityConnection conn =
    new EntityConnection(entityBuilder.ToString()))
{
    conn.Open();
    Console.WriteLine("Just testing the connection.");
    conn.Close();
}


' Specify the provider name, server and database. 
Dim providerName As String = "System.Data.SqlClient"
Dim serverName As String = "."
Dim databaseName As String = "AdventureWorks"

' Initialize the connection string builder for the 
' underlying provider. 
Dim sqlBuilder As New SqlConnectionStringBuilder()

' Set the properties for the data source. 
sqlBuilder.DataSource = serverName
sqlBuilder.InitialCatalog = databaseName
sqlBuilder.IntegratedSecurity = True

' Build the SqlConnection connection string. 
Dim providerString As String = sqlBuilder.ToString()

' Initialize the EntityConnectionStringBuilder. 
Dim entityBuilder As New EntityConnectionStringBuilder()

'Set the provider name. 
entityBuilder.Provider = providerName

' Set the provider-specific connection string. 
entityBuilder.ProviderConnectionString = providerString

' Set the Metadata location. 
entityBuilder.Metadata = "res://*/AdventureWorksModel.csdl|res://*/AdventureWorksModel.ssdl|res://*/AdventureWorksModel.msl"
Console.WriteLine(entityBuilder.ToString())

Using conn As New EntityConnection(entityBuilder.ToString())
    conn.Open()
    Console.WriteLine("Just testing the connection.")
    conn.Close()
End Using

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