ForLoop.Executables Property

Статья
12/15/2008

Returns a collection of executable objects that are processed during the ForLoop iteration.

Пространство имен: Microsoft.SqlServer.Dts.Runtime
Сборка: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Синтаксис

'Декларация
Public ReadOnly Property Executables As Executables

public Executables Executables { get; }

public:
virtual property Executables^ Executables {
    Executables^ get () sealed;
}

/** @property */
public final Executables get_Executables ()

public final function get Executables () : Executables

Значение свойства

An Executables collection.

Замечания

All containers, including the ForLoop, have an Executables property that contains the collection of executable objects processed by the run-time engine during execution of the container. The order of execution of the objects in the collection is determined by the PrecedenceConstraints that are inherited and implemented by the container.

Пример

The following code example creates a ForLoop and sets the three expression properties. The ForLoop also contains two tasks, found in the loop's Executables collection.

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Tasks.SendMailTask;
using Microsoft.SqlServer.Dts.Tasks.BulkInsertTask;

namespace ForLoopAPI
{
    class Program
    {
        static void Main(string[] args)
        {
            String varName = "MyVariable";
            int INIT_COUNT = 2;
            int MAX_COUNT = 5;

            Package pkg = new Package();
            Variable var = pkg.Variables.Add(varName, false, "", 0);
            Variable var2 = pkg.Variables.Add("Counter", false, "", 0);

            ForLoop forLoop = (ForLoop)pkg.Executables.Add("STOCK:ForLoop");
            forLoop.InitExpression = "@"+varName+" = "+INIT_COUNT;
            forLoop.EvalExpression = "@"+varName+" < "+MAX_COUNT;
            forLoop.AssignExpression = "@" + varName + " = @" + varName + " + " + INIT_COUNT;

            // Show a different syntax for setting these values.
            //forLoop.InitExpression = "@Counter = 1";
            //forLoop.AssignExpression = "@Counter = @Counter + 1";
            //forLoop.EvalExpression = "@Counter <= 10";

            // The ForLoop contains a Properties collection. 
           // Show how to set some properties using that collection.
            forLoop.Properties["Name"].SetValue(forLoop, "ForLoop Container");
            forLoop.Properties["Description"].SetValue(forLoop, "ForLoop Container");


            // Review the PackagePath of the ForLoop container.
            Console.WriteLine("PackagePath: {0}", forLoop.GetPackagePath());

            // Because the ForLoop is a container, it can contain tasks
            // that run at certain conditions.
            TaskHost thLoopMail = (TaskHost)forLoop.Executables.Add("STOCK:SendMailTask");
            TaskHost thLoopInsert = (TaskHost)forLoop.Executables.Add("STOCK:BulkInsertTask");
            Executables loopExecs = forLoop.Executables;
            Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count);

            // Like other containers, precedence constraints can be set on the
            // contained tasks.
            PrecedenceConstraint pc = forLoop.PrecedenceConstraints.Add((Executable)thLoopMail, thLoopInsert);
            PrecedenceConstraints pcs = forLoop.PrecedenceConstraints;
            Console.WriteLine("Number of precedence constraints: {0}", pcs.Count);


            // Run the package. Because required properties on the tasks are not
            //  set, current sample code will fail.
            DTSExecResult result = pkg.Execute();
        }
    }
}

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Imports Microsoft.SqlServer.Dts.Tasks.SendMailTask
Imports Microsoft.SqlServer.Dts.Tasks.BulkInsertTask

Namespace ForLoopAPI

   Class Program

      'Entry point which delegates to C-style main Private Function
      Public Overloads Shared Sub Main()
         Main(System.Environment.GetCommandLineArgs())
      End Sub
      
      Overloads Shared Sub Main(args() As String)
         Dim varName As String = "MyVariable"
         Dim INIT_COUNT As Integer = 2
         Dim MAX_COUNT As Integer = 5
         
         Dim pkg As New Package()
         Dim var As Variable = pkg.Variables.Add(varName, False, "", 0)
         Dim var2 As Variable = pkg.Variables.Add("Counter", False, "", 0)
         
         Dim forLoop As ForLoop = CType(pkg.Executables.Add("STOCK:ForLoop"), ForLoop)
         forLoop.InitExpression = "@" + varName + " = " + INIT_COUNT
         forLoop.EvalExpression = "@" + varName + " < " + MAX_COUNT
         forLoop.AssignExpression = "@" + varName + " = @" + varName + " + " + INIT_COUNT
         
         ' Show a different syntax for setting these values.
         forLoop.InitExpression = "@Counter = 1"
         forLoop.AssignExpression = "@Counter = @Counter + 1"
         forLoop.EvalExpression = "@Counter <= 10"
         ' The ForLoop contains a Properties collection. 
         ' Show how to set some properties using that collection.
         forLoop.Properties("Name").SetValue(forLoop, "ForLoop Container")
         forLoop.Properties("Description").SetValue(forLoop, "ForLoop Container")
         
         
         ' Review the PackagePath of the ForLoop container.
         Console.WriteLine("PackagePath: {0}", forLoop.GetPackagePath())
         
         ' Because the ForLoop is a container, it can contain tasks
         ' that run at certain conditions.
         Dim thLoopMail As TaskHost = CType(forLoop.Executables.Add("STOCK:SendMailTask"), TaskHost)
         Dim thLoopInsert As TaskHost = CType(forLoop.Executables.Add("STOCK:BulkInsertTask"), TaskHost)
         Dim loopExecs As Executables = forLoop.Executables
         Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count)
         
         ' Like other containers, precedence constraints can be set on the
         ' contained tasks.
         Dim pc As PrecedenceConstraint = forLoop.PrecedenceConstraints.Add(CType(thLoopMail, Executable), thLoopInsert)
         Dim pcs As PrecedenceConstraints = forLoop.PrecedenceConstraints
         Console.WriteLine("Number of precedence constraints: {0}", pcs.Count)
         
         
         ' Run the package. Because required properties on the tasks are not
         '  set, current sample code will fail.
         Dim result As DTSExecResult = pkg.Execute()
      End Sub 'Main
   End Class 'Program
End Namespace 'ForLoopAPI

Sample Output:

PackagePath: \Package\{8A18B94E-1176-429E-BB3D-6F3F1E0C9070}

Number of Executables in ForLoop: 2

Number of precedence constraints: 1

Синхронизация потоков

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Платформы

Платформы разработки

Список поддерживаемых платформ см. в разделе Hardware and Software Requirements for Installing SQL Server 2005.

Целевые платформы