DwUpdateAttribute Class

.NET Standard 2.x

Specifies the method for the insert, delete or update operation.

Namespace: DWNet.Data

Assembly: DWNet.Data.dll

Inheritance Constructor

System.Attribute

Syntax

   [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
   public class DwUpdateAttribute : Attribute

Constructors

Name	Description
DwUpdateAttribute(DwUpdateAction action, string name)	Initializes a new instance of the DwUpdateAttribute class.

Properties

Name	Return Type	Description
Action	DwUpdateAction	An enumerated value that defines the update, delete, or insert action
Name	string	The method for the operation

Remarks

This class corresponds to the Stored Procedure Update method defined by DataWindow.

Examples

The following code example demonstrates how to use the Model DwUpdate attribute. The example defines DwUpdate(DwUpdateAction.Delete, "dbo.DeletePerson;1"), which means when DataStore performs the Delete operation, it executes the stored procedure dbo.DeletePerson, rather than generating the Delete SQL statement.

Model: D_Person_With_Deleteaction

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using SnapObjects.Data;
using DWNet.Data;
using Newtonsoft.Json;
using System.Collections;

namespace Appeon.ApiDoc.Models
{
    [DataWindow("d_person_with_deleteaction", DwStyle.Grid)]
    [Table("Person")]
    #region DwSelectAttribute  
    [DwSelect("PBSELECT( VERSION(400) TABLE(NAME=\"Person\" ) @(_COLUMNS_PLACEHOLDER_) )")]
    #endregion
    [DwUpdate(DwUpdateAction.Delete, "dbo.DeletePerson;1")]
    [DwUpdateParameter(DwUpdateAction.Delete, DwArgumentSource.Column, "PersonID", "personid", UseOriginal = true, Direction = System.Data.ParameterDirection.Input)]
    [DwKeyModificationStrategy(UpdateSqlStrategy.DeleteThenInsert)]
    [UpdateWhereStrategy(UpdateWhereStrategy.KeyAndConcurrencyCheckColumns)]
    public class D_Person_With_Deleteaction
    {
        [Key]
        [Identity]
        [DwColumn("Person", "PersonID")]
        public int Personid { get; set; }

        [ConcurrencyCheck]
        [StringLength(50)]
        [DwColumn("Person", "LastName")]
        public string Lastname { get; set; }

        [ConcurrencyCheck]
        [StringLength(50)]
        [DwColumn("Person", "FirstName")]
        public string Firstname { get; set; }

        [ConcurrencyCheck]
        [DwColumn("Person", "HireDate")]
        public DateTime? Hiredate { get; set; }

        [ConcurrencyCheck]
        [DwColumn("Person", "EnrollmentDate")]
        public DateTime? Enrollmentdate { get; set; }

        [ConcurrencyCheck]
        [StringLength(50)]
        [DwColumn("Person", "Discriminator")]
        public string Discriminator { get; set; }

    }

}

Example Method:

using System;
using DWNet.Data;

namespace Appeon.ApiDoc.DwUpdateAttributeExamples
{
    public class DwUpdateAttributeExample
    {
        private readonly SchoolContext _context;

        public DwUpdateAttributeExample(SchoolContext dataContext)
        {
            // Sets the data context.
            _context = dataContext;
        }

        public void Example()
        {
            var datastore = new DataStore("d_person_with_deleteaction", _context);
            datastore.Retrieve();
			
			//Deletes the first row from the primary buffer of DataStore.
            datastore.DeleteRow(0);
			
			//Commits the changes to the DataStore.
            datastore.Update();

            /* The following SQL is generated:
            exec dbo.DeletePerson @PersonID=1
            
            */
        }
    }
}

Example Refer To

DataWindow File: d_person_with_deleteaction