PrecedenceConstraint.PrecedenceExecutable Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene el nombre del ejecutable de precedencia. Esta propiedad es de sólo lectura.
public:
property Microsoft::SqlServer::Dts::Runtime::Executable ^ PrecedenceExecutable { Microsoft::SqlServer::Dts::Runtime::Executable ^ get(); };
[Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "PCFromExecDesc")]
public Microsoft.SqlServer.Dts.Runtime.Executable PrecedenceExecutable { get; }
[<Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "PCFromExecDesc")>]
member this.PrecedenceExecutable : Microsoft.SqlServer.Dts.Runtime.Executable
Public ReadOnly Property PrecedenceExecutable As Executable
Valor de propiedad
Objeto Executable.
- Atributos
Ejemplos
En el ejemplo de código siguiente se crean tres tareas y se conectan mediante restricciones de precedencia. A continuación, el ejemplo recorre en iteración las restricciones de la PrecedenceConstraints colección del paquete, imprimiendo información sobre cada restricción.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
namespace PrecedenceConst
{
class Program
{
static void Main(string[] args)
{
Package pkg = new Package();
// Add a File System task.
Executable eFileTask1 = pkg.Executables.Add("STOCK:FileSystemTask");
TaskHost thFileTask1 = eFileTask1 as TaskHost;
// Add a second File System task.
Executable eFileTask2 = pkg.Executables.Add("STOCK:FileSystemTask");
TaskHost thFileTask2 = eFileTask2 as TaskHost;
// Add a Bulk Insert task.
Executable eBulkInsert = pkg.Executables.Add("STOCK:BulkInsertTask");
TaskHost thBulkInsert = eBulkInsert as TaskHost;
// Add a precedence contraint between eFileTask1 and eFileTask2.
// Set the constraint to be that eFileTask2 cannot run
// until eFileTask1 completes.
PrecedenceConstraint pcFileTasks = pkg.PrecedenceConstraints.Add(eFileTask1, eFileTask2);
// Add another precedence contraint. Add it between eFileTask2 and BulkInsert.
// Again, set the constraint to be that BulkInsert cannot run
// until eFileTask2 completes.
PrecedenceConstraint pcFiletoBulk = pkg.PrecedenceConstraints.Add(eFileTask2, eBulkInsert);
// Obtain the precedence constraint collection, and display properties.
// Some properties are read/write and have not been set.
PrecedenceConstraints pConsts = pkg.PrecedenceConstraints;
foreach (PrecedenceConstraint pc in pConsts)
{
Console.WriteLine("Constrained container {0}", pc.ConstrainedExecutable);
Console.WriteLine("Creation Name {0}", pc.CreationName);
Console.WriteLine("Description {0}", pc.Description);
Console.WriteLine("Evaluation operation {0}", pc.EvalOp);
Console.WriteLine("Evaluates true {0}", pc.EvaluatesTrue);
Console.WriteLine("Expression {0}", pc.Expression);
Console.WriteLine("ID {0}", pc.ID);
Console.WriteLine("LogicalAnd {0}", pc.LogicalAnd);
Console.WriteLine("Name {0}", pc.Name);
Console.WriteLine("Precedence Executable {0}", pc.PrecedenceExecutable);
Console.WriteLine("Value {0}", pc.Value);
Console.WriteLine("-----------------------------------");
}
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Namespace PrecedenceConst
Class Program
Shared Sub Main(ByVal args() As String)
Dim pkg As Package = New Package()
' Add a File System task.
Dim eFileTask1 As Executable = pkg.Executables.Add("STOCK:FileSystemTask")
Dim thFileTask1 As TaskHost = eFileTask1 as TaskHost
' Add a second File System task.
Dim eFileTask2 As Executable = pkg.Executables.Add("STOCK:FileSystemTask")
Dim thFileTask2 As TaskHost = eFileTask2 as TaskHost
' Add a Bulk Insert task.
Dim eBulkInsert As Executable = pkg.Executables.Add("STOCK:BulkInsertTask")
Dim thBulkInsert As TaskHost = eBulkInsert as TaskHost
' Add a precedence contraint between eFileTask1 and eFileTask2.
' Set the constraint to be that eFileTask2 cannot run
' until eFileTask1 completes.
Dim pcFileTasks As PrecedenceConstraint = pkg.PrecedenceConstraints.Add(eFileTask1,eFileTask2)
' Add another precedence contraint. Add it between eFileTask2 and BulkInsert.
' Again, set the constraint to be that BulkInsert cannot run
' until eFileTask2 completes.
Dim pcFiletoBulk As PrecedenceConstraint = pkg.PrecedenceConstraints.Add(eFileTask2,eBulkInsert)
' Obtain the precedence constraint collection, and display properties.
' Some properties are read/write and have not been set.
Dim pConsts As PrecedenceConstraints = pkg.PrecedenceConstraints
Dim pc As PrecedenceConstraint
For Each pc In pConsts
Console.WriteLine("Constrained container {0}", pc.ConstrainedExecutable)
Console.WriteLine("Creation Name {0}", pc.CreationName)
Console.WriteLine("Description {0}", pc.Description)
Console.WriteLine("Evaluation operation {0}", pc.EvalOp)
Console.WriteLine("Evaluates true {0}", pc.EvaluatesTrue)
Console.WriteLine("Expression {0}", pc.Expression)
Console.WriteLine("ID {0}", pc.ID)
Console.WriteLine("LogicalAnd {0}", pc.LogicalAnd)
Console.WriteLine("Name {0}", pc.Name)
Console.WriteLine("Precedence Executable {0}", pc.PrecedenceExecutable)
Console.WriteLine("Value {0}", pc.Value)
Console.WriteLine("-----------------------------------")
Next
End Sub
End Class
End Namespace
Salida del ejemplo:
Contenedor restringido Microsoft.SqlServer.Dts.Runtime.TaskHost
Nombre de creación
Descripción
Restricción de operación de evaluación
Evalúa true True
Expression
Id. {BA20A288-545D-4E48-864A-E6AF6C3B9AEE}
LogicalAnd True
Nombre {BA20A288-545D-4E48-864A-E6AF6C3B9AEE}
Ejecutable de precedencia Microsoft.SqlServer.Dts.Runtime.TaskHost
Valor correcto
-----------------------------------
Contenedor restringido Microsoft.SqlServer.Dts.Runtime.TaskHost
Nombre de creación
Descripción
Restricción de operación de evaluación
Evalúa true True
Expression
Id. {E8DBC95E-AF27-45D7-B961-17E908CC4530}
LogicalAnd True
Nombre {E8DBC95E-AF27-45D7-B961-17E908CC4530}
Ejecutable de precedencia Microsoft.SqlServer.Dts.Runtime.TaskHost
Valor correcto
-----------------------------------