ForLoop.AssignExpression Propriété

Définition

Espace de noms:

Microsoft.SqlServer.Dts.Runtime

Assembly:

Microsoft.SqlServer.ManagedDTS.dll

Obtient ou définit une expression pour incrémenter ou décrémenter le compteur de boucle.

public:
 property System::String ^ AssignExpression { System::String ^ get(); void set(System::String ^ value); };

[Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "AssignExpressionDesc")]
public string AssignExpression { get; set; }

[<Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "AssignExpressionDesc")>]
member this.AssignExpression : string with get, set

Public Property AssignExpression As String

Valeur de propriété

String

Chaîne qui contient l’expression qui incrémente ou décrémente le compteur de boucle.

Attributs

LocalizablePropertyDescriptionAttribute

Exemples

L’exemple de code suivant crée un ForLoop et définit les trois propriétés d’expression. Il ForLoop contient également deux tâches avec une contrainte de précédence.

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  

Exemple de sortie :

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

Nombre d’exécutables dans ForLoop : 2

Nombre de contraintes de précédence : 1