OleDbConnectionStringBuilder.OleDbServices 属性

定义

命名空间:

System.Data.OleDb

程序集:

System.Data.OleDb.dll

包:

System.Data.OleDb v9.0.0-rc.2.24473.5

Source:

OleDbConnectionStringBuilder.cs

获取或设置要为连接字符串内的 OLE DB Services 键传递的值。

public:
 property int OleDbServices { int get(); void set(int value); };

[System.ComponentModel.TypeConverter(typeof(System.Data.OleDb.OleDbConnectionStringBuilder+OleDbServicesConverter))]
public int OleDbServices { get; set; }

[<System.ComponentModel.TypeConverter(typeof(System.Data.OleDb.OleDbConnectionStringBuilder+OleDbServicesConverter))>]
member this.OleDbServices : int with get, set

Public Property OleDbServices As Integer

属性值

Int32

与连接字符串中的 OLE DB Services 键对应的值。 默认情况下，该值为 -13。

属性

TypeConverterAttribute

示例

以下示例通过两种方式使用 OleDbServices 属性。 首先，它将值直接分配给 属性，演示此操作对生成的连接字符串的影响。 然后，该示例清除 OleDbConnectionStringBuilder 并分配包含 OLE DB Services 键值的完整连接字符串。 此步骤演示设置来自 连接字符串的值也会OleDbServices修改 属性。

using System.Data.OleDb;

class Program
{
    // These constants correspond to values in the
    // OLE DB SDK. You can use these values to
    // turn features on and off.
    private const int DBPROPVAL_OS_AGR_AFTERSESSION = 8;
    private const int DBPROPVAL_OS_AGR_RESOURCEPOOLING = 1;
    private const int DBPROPVAL_OS_AGR_TXNENLISTMENT = 2;
    private const int DBPROPVAL_OS_AGR_CLIENTCURSOR = 4;
    private const int DBPROPVAL_OS_ENABLEALL = -1;
    private const int DBPROPVAL_OS_DISABLEALL = 0;

    static void Main()
    {
        OleDbConnectionStringBuilder builder =
            new OleDbConnectionStringBuilder();
        // Turn on all services except resource pooling.
        builder.OleDbServices =
            DBPROPVAL_OS_ENABLEALL &
            ~DBPROPVAL_OS_AGR_RESOURCEPOOLING;

        builder.Provider = "sqloledb";
        builder.DataSource = "(local)";
        builder["Initial Catalog"] = "AdventureWorks";
        builder["Integrated Security"] = "SSPI";

        // Store the connection string.
        string savedConnectionString = builder.ConnectionString;
        Console.WriteLine(savedConnectionString);

        // Reset the object. This resets all the properties to their
        // default values.
        builder.Clear();

        // Investigate the OleDbServices property before
        // and after assigning a connection string value.
        Console.WriteLine("Default : " + builder.OleDbServices);
        builder.ConnectionString = savedConnectionString;
        Console.WriteLine("Modified: " + builder.OleDbServices);

        Console.WriteLine("Press Enter to finish.");
        Console.ReadLine();
    }
}

Imports System.Data.OleDb    

Module Module1
  ' These constants correspond to values in the 
  ' OLE DB SDK. You can use these values to 
  ' turn features on and off.
  Private Const DBPROPVAL_OS_AGR_AFTERSESSION As Integer = 8
  Private Const DBPROPVAL_OS_AGR_RESOURCEPOOLING As Integer = 1
  Private Const DBPROPVAL_OS_AGR_TXNENLISTMENT As Integer = 2
  Private Const DBPROPVAL_OS_AGR_CLIENTCURSOR As Integer = 4
  Private Const DBPROPVAL_OS_ENABLEALL As Integer = -1
  Private Const DBPROPVAL_OS_DISABLEALL As Integer = 0

  Sub Main()
    Dim builder As New OleDbConnectionStringBuilder()
    ' Turn on all services except resource pooling.
    builder.OleDbServices = DBPROPVAL_OS_ENABLEALL _
     And Not DBPROPVAL_OS_AGR_RESOURCEPOOLING

    builder.Provider = "sqloledb"
    builder.DataSource = "(local)"
    builder("Initial Catalog") = "AdventureWorks"
    builder("Integrated Security") = "SSPI"

    ' Store the connection string.
    Dim savedConnectionString As String = builder.ConnectionString
    Console.WriteLine(savedConnectionString)

    ' Reset the object. This resets all the properties to their
    ' default values.
    builder.Clear()

    ' Investigate the OleDbServices property before
    ' and after assigning a connection string value.
    Console.WriteLine("Default : " & builder.OleDbServices)
    builder.ConnectionString = savedConnectionString
    Console.WriteLine("Modified: " & builder.OleDbServices)

    Console.WriteLine("Press Enter to finish.")
    Console.ReadLine()
  End Sub
End Module

注解

连接字符串中的 OLE DB Services 键定义允许开发人员启用或禁用 OLE DB 服务的值组合。 属性包含值的按位组合，如 OLE DB 文档中所述。 有关此属性的相应值的详细信息，请参阅 OLE DB 程序员参考，特别是“替代提供程序服务默认值”。此属性的默认值为 -13。 这对应于资源池、自动事务登记、会话级聚合和无客户端游标引擎的请求。

另请参阅

• 连接字符串生成器
• ADO.NET 中的连接字符串