Three tier one-many issue

I'm having difficulty with a one to many relationship in a three tier model.
I am reading an object at the service layer and following an indirection to pull back a list of owned objects through a one to many, then passign it back to my web tier.
To save the object I pass it back to my service layer, instantiate a uow, do uow.readObject(rmiCopy), then uow.deepMerge(rmiCopy), and commit.
This always works if I insert or delete or even edit the related objects. But if I update a one-to-one relationship within the child object I get the exception below.
I've left in the SQL because I don't understand why it is generated and think it may be part of the problem. Note that it is selecting crystal_id and is using crystal_id in the where clause as well. I suppose this suggests an error in my mapping but for the life of me I can't find it.
Thanks,
Mike
5492,5,main]--#executeQuery(ReadObjectQuery(com.sgx.domain.cti.CryoContents))
2004.06.11 09:51:45.441--ServerSession(19512411)--Thread[HttpRequestHandler-2680
5492,5,main]--Connection(24797434)--SELECT t1.CRYSTAL_ID, t1.AMOUNT, t1.UOM, t1.
SUBSTANCE_ID, t0.PH, t0.SMILE_STRING, t0.COMMENTS, t0.SOLUBILITY, t0.GRAMS_PER_5
0ML, t0.SUBSTANCE_ID, t0.LIQUID_CLASS, t0.SUBSTANCE_NAME, t0.CAS, t0.SUBSTANCE_T
YPE, t0.IS_CRYO, t0.TUBE_NUMBER, t0.CONCENTRATION, t0.UOM, t0.MOLECULAR_WEIGHT,
t0.VENDOR FROM SGX.SUBSTANCES t0, SGX.CRYO_CONTENTS t1 WHERE (((t1.CRYSTAL_ID =
?) AND (t1.SUBSTANCE_ID = ?)) AND (t0.SUBSTANCE_ID = t1.SUBSTANCE_ID))
bind => [3878, 134]
2004.06.11 09:51:45.441--ServerSession(19512411)--Thread[HttpRequestHandler-2680
5492,5,main]--#reconnecting to external connection pool
2004.06.11 09:51:45.441--UnitOfWork(25134304)--Thread[HttpRequestHandler-2680549
2,5,main]--#executeQuery(DoesExistQuery())
2004.06.11 09:51:45.441--ClientSession(15515681)--Thread[HttpRequestHandler-2680
5492,5,main]--#executeQuery(DoesExistQuery())
2004.06.11 09:51:45.441--ServerSession(19512411)--Thread[HttpRequestHandler-2680
5492,5,main]--Connection(25154336)--SELECT CRYSTAL_ID FROM SGX.CRYO_CONTENTS WHE
RE ((CRYSTAL_ID = ?) AND (SUBSTANCE_ID = ?))
bind => [3878, 134]
2004.06.11 09:51:45.441--ServerSession(19512411)--Thread[HttpRequestHandler-2680
5492,5,main]--#reconnecting to external connection pool
2004.06.11 09:51:45.504--UnitOfWork(25134304)--Thread[HttpRequestHandler-2680549
2,5,main]--#register(com.sgx.domain.cti.Substance@5a77b6)
2004.06.11 09:51:45.519--UnitOfWork(25134304)--Thread[HttpRequestHandler-2680549
2,5,main]--java.lang.NullPointerExceptionjava.lang.NullPointerException
at oracle.toplink.internal.indirection.QueryBasedValueHolder.instantiate
(Unknown Source)
at oracle.toplink.internal.indirection.DatabaseValueHolder.getValue(Unkn
own Source)
at oracle.toplink.internal.indirection.BasicIndirectionPolicy.cloneAttri
bute(Unknown Source)
at oracle.toplink.mappings.ForeignReferenceMapping.buildClone(Unknown So
urce)
at oracle.toplink.internal.descriptors.ObjectBuilder.populateAttributesF
orClone(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.cloneAndRegisterNewObject(U
nknown Source)
at oracle.toplink.publicinterface.UnitOfWork.internalRegisterObject(Unkn
own Source)
at oracle.toplink.internal.sessions.MergeManager.registerObjectForMergeC
loneIntoWorkingCopy(Unknown Source)
at oracle.toplink.internal.sessions.MergeManager.mergeChangesOfCloneInto
WorkingCopy(Unknown Source)
at oracle.toplink.internal.sessions.MergeManager.mergeChanges(Unknown So
urce)
at oracle.toplink.mappings.CollectionMapping.mergeIntoObject(Unknown Sou
rce)
at oracle.toplink.internal.descriptors.ObjectBuilder.mergeIntoObject(Unk
nown Source)
at oracle.toplink.internal.sessions.MergeManager.mergeChangesOfCloneInto
WorkingCopy(Unknown Source)
at oracle.toplink.internal.sessions.MergeManager.mergeChanges(Unknown So
urce)
at oracle.toplink.publicinterface.UnitOfWork.mergeClone(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.deepMergeClone(Unknown Sour
ce)
at com.sgx.serviceLayer.cti.impl.CrystalsBean.saveCrystal(CrystalsBean.j
ava:146)

Okay, I wonder if someone could just explain the limitations of working with objects in a three-tier application.
How extensively can I safely modify an object in the web tier and still have it merge successfully when I return a copy to the serviceLayer?
Is it just that I have to be careful not to follow indirections or is there more to watch out for?
Mike

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If you have any feedback on our support, please click
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Mike Yin
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Need help to join two tables using three joins, one of which is a (between) date range.

I am trying to develop a query in MS Access 2010 to join two tables using three joins, one of which is a (between) date range. The tables are contained in Access. The reason
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ABCPART links to XYZPART. ABCSERIAL links to XYZSERIAL. ABCDATE links to (between) XYZDATE1 and ZYZDATE2.
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To many issues incredible 2

I purchased the incredible 2 in may 2011 , since then I am now on my fourth phone. I have had to return each one for so many issues and find it hard to believe when tech support tells me its the first time they hear of a problem. I have spoken with at least 30 different tech support staff over these few months as well as HTC directly and to date NO resolve. Here are some of the issues I have encountered.
3 G always remains at 1G if it does show 3 G and I attempt open even the market it drops back to 1G. There are times when the market takes more than ten minutes to load.
Next is the battery life, after a full charge the battery reduces to 15% in about an hour to an hour an a half.
My settings such as sound, or mobile network arbitrarely alter themselves. The ringtones change, the applications settings change and also the ability to download applications change not allowing the phone to download apps. I have to manually go and change all the settings over and over again.
My phones no longer allow me to use HTC clock widgets, either I get a force close , unupdated weather and none of the alarm clocks, timer, world clock etc..are accessible. HTC even asked that I video tape the widget issues and send it to thier escalation department, which I did. According to HTC they cannot duplicate the problem, but are fully aware of the issue. Verizon on the other hand claims to know nothing.
The HTC s get more widgets always tells me unable to load or unavailable. Clearly this us an issue with HTC product and more than a month has passed and no reseloution in sight.
I received my 4th incredible 2 in the mail today and immedietly called Verizon to say I am not accepting this and I now want another phone by anyone other than HTC.
Clearly people are posting these issues and many more but sadly none if them seem to be being addressed. It is my hope that my next phone coming tomorrow will work. So much for that so called most reliable service. Just a side note as I typed this my keyboard now seems to disappear and or will not allow me to back space.
My hope is those who have all these issues bombarded HTC and their carrier so the products sold are functional and we get what we pay for.

pipster wrote:
I purchased the incredible 2 in may 2011 , since then I am now on my fourth phone. I have had to return each one for so many issues and find it hard to believe when tech support tells me its the first time they hear of a problem. I have spoken with at least 30 different tech support staff over these few months as well as HTC directly and to date NO resolve. Here are some of the issues I have encountered.
3 G always remains at 1X if it does show 3 G and I attempt open even the market it drops back to 1X. There are times when the market takes more than ten minutes to load.
This is a network issue not a device issue, how strong is your network connection? How many bars do your device have?
Next is the battery life, after a full charge the battery reduces to 15% in about an hour to an hour an a half.
All 4G devices has quick battery drain issue because of the power the radio requires to recieve reception. You could have learned of this from a number of forums because it is widely reported, usually a extended battery resolves this.
My settings such as sound, or mobile network arbitrarely alter themselves. The ringtones change, the applications settings change and also the ability to download applications change not allowing the phone to download apps. I have to manually go and change all the settings over and over again.
If you are using device as Mass Storage and use custom ringers this is a normal situation because the phone can not access the ringer file that is stored on sd card when it is in Mass Storage mode, usually a restart resolves this. Now as for the network connection I would need more info to understand what you mean.
My phones no longer allow me to use HTC clock widgets, either I get a force close , unupdated weather and none of the alarm clocks, timer, world clock etc..are accessible. HTC even asked that I video tape the widget issues and send it to thier escalation department, which I did. According to HTC they cannot duplicate the problem, but are fully aware of the issue. Verizon on the other hand claims to know nothing.
Weather updating error sounds like a network issue again but as for the Force Close have you tried checking installed apps are not causing this issue because I have seen this regularly..
The HTC s get more widgets always tells me unable to load or unavailable. Clearly this us an issue with HTC product and more than a month has passed and no reseloution in sight.
Another possible network issue..
I received my 4th incredible 2 in the mail today and immedietly called Verizon to say I am not accepting this and I now want another phone by anyone other than HTC.
Clearly people are posting these issues and many more but sadly none if them seem to be being addressed. It is my hope that my next phone coming tomorrow will work. So much for that so called most reliable service. Just a side note as I typed this my keyboard now seems to disappear and or will not allow me to back space.
My hope is those who have all these issues bombarded HTC and their carrier so the products sold are functional and we get what we pay for.
Sounds like you are having reception issues in my opinion and no matter what device you recieve will resolve this and also you may want to try running device without installing ant 3rd party apps and see what happens because the issies you are having isnt a device issue.

WPF How can I implement the INotifyPropertyChanged in a Three-tier architecture?

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var command = new SqlCommand();
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command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@Id", parameters.Id).Direction = ParameterDirection.Input;
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command.Parameters.AddWithValue("@LastName", parameters.LastName).Direction = ParameterDirection.Input;
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command.Parameters.AddWithValue("@CityId", parameters.CityId).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@ProvinceId", parameters.ProvinceId).Direction = ParameterDirection.Input;
DataTable dt = SqlHelper.GetData(command);
foreach (DataRow row in dt.Rows)
var item = new Patient();
item.Id = TDefaultValue.GetLong(row["Id"].ToString());
item.PatientNumber = (row["PatientNumber"].ToString());
item.LastName = (row["LastName"].ToString());
item.FirstName = (row["FirstName"].ToString());
item.MiddleName = (row["MiddleName"].ToString());
item.AddressLine1 = (row["AddressLine1"].ToString());
item.CityId = (short)row["CityId"].ToString();
item.CityName = (row["CityName"].ToString());
item.ProvinceId = (short)row["ProvinceId"].ToString();
item.ProvinceName = (row["ProvinceName"].ToString());
items.Add(item);
return items;
public bool Insert(Patient entity, int userId, ref bool doesExist)
var command = new SqlCommand();
try
command.CommandText = "AddPatient";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@PatientNumber", entity.PatientNumber).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@LastName", entity.LastName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@FirstName", entity.FirstName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@MiddleName", entity.MiddleName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@AddressLine1", entity.AddressLine1).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@CityId", entity.CityId).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@ProvinceId", entity.ProvinceId).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@Id", entity.Id).Direction = ParameterDirection.Input;
command.Parameters.Add("@DoesExist", SqlDbType.Bit).Direction = ParameterDirection.Output;
int result = SqlHelper.ExecuteNonQuery(command);
doesExist = (bool)(command.Parameters["@DoesExist"].Value);
entity.Id = (int)(command.Parameters["@Id"].Value);
if (result == 0 || doesExist)
return false;
return true;
catch (Exception)
return false;
public bool Update(Patient entity, int userId, ref bool doesExist)
var command = new SqlCommand();
try
command.CommandText = "EditPatient";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@PatientNumber", entity.PatientNumber).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@LastName", entity.LastName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@FirstName", entity.FirstName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@MiddleName", entity.MiddleName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@AddressLine1", entity.AddressLine1).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@CityId", entity.CityId).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@ProvinceId", entity.ProvinceId).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@Id", SqlDbType.Int).Direction = ParameterDirection.Output;
command.Parameters.Add("@DoesExist", SqlDbType.Bit).Direction = ParameterDirection.Output;
doesExist = (bool)(command.Parameters["@DoesExist"].Value);
int result = SqlHelper.ExecuteNonQuery(command);
if (result == 0 || doesExist)
return false;
return true;
catch (Exception)
return false;
Then a business logic
3. MetroApp.BusinessLogic = class libray for calling the methods from DataAccess
namespace MetroApp.BusinessLogic
public class PatientMgr
#region Fields
private readonly PatientDb _db;
#endregion
#region Properties
public Patient Entity { get; set; }
public List<Patient> EntityList { get; set; }
public PatientParams Parameters { get; set; }
#endregion
#region Constructors
public PatientMgr()
_db = new PatientDb();
Entity = new Patient();
EntityList = new List<Patient>();
Parameters = new PatientParams();
#endregion
#region Methods
public Patient Retrieve(PatientParams parameters)
return _db.Retrieve(parameters);
public List<Patient> RetrieveMany(PatientParams parameters)
return _db.RetrieveMany(parameters);
public bool Insert(Patient entity, int userId, ref bool doesExist)
return _db.Insert(entity, userId, ref doesExist);
public bool Update(Patient entity, int userId, ref bool doesExist)
return _db.Update(entity, userId, ref doesExist);
#endregion
Then the last one, the WPF GUI
<UserControl x:Class="MetroDentProject.Pages.PatientDetailsPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:dims="clr-namespace:MetroAppProject.UserCons"
mc:Ignorable="d"
d:DesignHeight="720" d:DesignWidth="1280">
<Grid x:Name="MainGrid" >
<Grid.RowDefinitions>
<RowDefinition Height="40"/>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<GroupBox Grid.Column="0" Grid.Row="1" Grid.RowSpan="7" x:Name="DetailsGroupBox" Header="Patient Details" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text="Id: " Grid.Column="1" Grid.Row="0" Visibility="Collapsed"/>
<TextBox x:Name="IdTextBox" Grid.Column="1" Grid.Row="1" Visibility="Collapsed"/>
<TextBlock x:Name="PatientNumberTextBlock" Text="Patient Number: " Grid.Column="0" Grid.Row="0" />
<TextBox x:Name="PatientNumberTextBox" Grid.Column="1" Grid.Row="0" IsReadOnly="True" IsReadOnlyCaretVisible="True"/>
<TextBlock Text="Last Name: " Grid.Column="0" Grid.Row="1" />
<TextBox x:Name="LastNameTextBox" Grid.Column="1" Grid.Row="1" />
<TextBlock Text="First Name: " Grid.Column="0" Grid.Row="2" />
<TextBox x:Name="FirstNameTextBox" Grid.Column="1" Grid.Row="2" />
<TextBlock Text="Middle Name: " Grid.Column="0" Grid.Row="3" />
<TextBox x:Name="MiddleNameTextBox" Grid.Column="1" Grid.Row="3" />
</Grid>
</GroupBox>
<GroupBox x:Name="ContactDetailsGroupBox" Header="Contact Details" Grid.Column="1" Grid.Row="1" Grid.RowSpan="7">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text="Address: " Grid.Column="0" Grid.Row="0" Grid.RowSpan="2" />
<TextBlock Text="City: " Grid.Column="0" Grid.Row="2" />
<TextBlock Text="Province: " Grid.Column="0" Grid.Row="3"/>
<TextBox x:Name="AddressTextBox" Grid.Column="1" Grid.Row="0" Grid.RowSpan="2"
TextWrapping="Wrap"
AcceptsReturn="True"
VerticalScrollBarVisibility="Auto"
/>
<ComboBox x:Name="CitiesComboBox" Grid.Column="1" Grid.Row="2" />
<ComboBox x:Name="ProvincesComboBox" Grid.Column="1" Grid.Row="3" />
</Grid>
</GroupBox>
<dims:FunctionButtonsControl x:Name="FunctionButtonsCon" Grid.Row="9" Grid.Column="0" Grid.ColumnSpan="2"
ExecuteClick="FunctionButtonsCon_OnExecuteClick"
UndoClick="FunctionButtonsCon_OnUndoClick"
BackClick="FunctionButtonsCon_OnBackClick"
DeleteClick="FunctionButtonsCon_OnDeleteClick"
/>
</Grid>
</UserControl>
I apologize for the long post. As you can see, I don't use binding. Binding requires me to use INotifyPropertyChanged interface which I am not familiar. Can you at least make my project to implement the INotifypropertyChanged?
Here is my sample code for the WPF page:
public partial class PatientDetailsPage
readonly PatientMgr itemMgr = new PatientMgr();
public PatientParams CurrentPar = new PatientParams(); // for undoActionType _action = ActionType.Insert; // this is an enum from another project, ActionType.Insert, ActionType.Update
public ActionType Action
get { return _action; }
set { _action = value; }
public PatientDetailsPage()
InitializeComponent();
BindComboBoxes();
#region Methods
public void OnFragmentNavigation(FragmentNavigationEventArgs e)
public void OnNavigatedFrom(NavigationEventArgs e)
public void OnNavigatedTo(NavigationEventArgs e)
{ Setup();
public void OnNavigatingFrom(NavigatingCancelEventArgs e)
public Patient GetPageEntity()
Patient setEntity = new Patient();
setEntity.Id = (long)IdTextBox.Text;
setEntity.PatientNumber = PatientNumberTextBox.Text;
setEntity.LastName = LastNameTextBox.Text;
setEntity.FirstName = FirstNameTextBox.Text;
setEntity.MiddleName = MiddleNameTextBox.Text;
setEntity.AddressLine1 = AddressTextBox.Text;
setEntity.CityId = (short)CitiesComboBox.SelectedValue);
setEntity.ProvinceId = (short)ProvincesComboBox.SelectedValue;
setEntity.StatusId = true;
return setEntity;
public void Setup()
switch (Action)
case ActionType.Insert:
Clearer(); //clears all textboxes and set all comboboxes to default
this.PatientNumberTextBlock.Visibility = Visibility.Collapsed;
this.PatientNumberTextBox.Visibility = Visibility.Collapsed;
FunctionButtonsCon.ExecuteButton.Content = "Add";
FunctionButtonsCon.DeleteButton.IsEnabled = false;
FunctionButtonsCon.DeleteButton.Visibility = Visibility.Hidden;
break;
//**Setup Update
case ActionType.Update:CurrentPar.Id = (long)IdTextBox.Text;
LoadSingle(CurrentPar);
this.PatientNumberTextBlock.Visibility = Visibility.Visible;
this.PatientNumberTextBox.Visibility = Visibility.Visible;
FunctionButtonsCon.ExecuteButton.Content = "Save";
FunctionButtonsCon.DeleteButton.IsEnabled = true;
FunctionButtonsCon.DeleteButton.Visibility = Visibility.Visible;
break;
LastNameTextBox.CaretIndex = LastNameTextBox.Text.Length;
IsVisibleChanged += AutoFocus;
public void LoadSingle(PatientParams parameters)
var entity = itemMgr.Retrieve(parameters); //calls the BusinessLogic
IdTextBox.Text = (entity.Id);
PatientNumberTextBox.Text = (entity.PatientNumber);
LastNameTextBox.Text = (entity.LastName);
FirstNameTextBox.Text = (entity.FirstName);
MiddleNameTextBox.Text = (entity.MiddleName);
AddressTextBox.Text = (entity.AddressLine1);
CitiesComboBox.SelectedValue = (short)entity.CityId;
ProvincesComboBox.SelectedValue = (short)entity.ProvinceId;
public void Save(ActionType action, int userId)
itemMgr.Entity = GetPageEntity();
bool doesExist = false;
switch (action)
case ActionType.Insert:
if (itemMgr.Insert((itemMgr.Entity), userId, ref doesExist))
System.Windows.Forms.MessageBox.Show("Successfully added a Patient!", "Patient Insertion");
else if (doesExist)
System.Windows.Forms.MessageBox.Show("Item already exists.", "Patient Insertion");
else
System.Windows.Forms.MessageBox.Show("Not all fields were filled in.", "Patient Insertion");
break;
case ActionType.Update:
if (itemMgr.Update(itemMgr.Entity, userId, ref doesExist))
System.Windows.Forms.MessageBox.Show("Successfully updated a Patient!", "Patient Modification");
itemMgr.Parameters.Id = itemMgr.Entity.Id;
Action = ActionType.Update;
Setup();
else if (doesExist)
System.Windows.Forms.MessageBox.Show("Item already exists.", "Patient Modification");
else
System.Windows.Forms.MessageBox.Show("Not all fields were filled in.", "Patient Modification");
break;
public void Clearer()
IdTextBox.Clear();
PatientNumberTextBox.Clear();
LastNameTextBox.Clear();
FirstNameTextBox.Clear();
MiddleNameTextBox.Clear();
CitiesComboBox.SelectedIndex = 0;
ProvincesComboBox.SelectedIndex = 0;
AddressTextBox.Clear();
public void BindComboBoxes()
CitiesComboBox.ItemsSource = new BindingSource(CommonMgr.GetCitiesDropDown(), null);// the CommonMgr is a static class from another project. It works just fine
CitiesComboBox.DisplayMemberPath = "Value";
CitiesComboBox.SelectedValuePath = "Key";
ProvincesComboBox.ItemsSource = new BindingSource(CommonMgr.GetProvincesDropDown(), null);
ProvincesComboBox.DisplayMemberPath = "Value";
ProvincesComboBox.SelectedValuePath = "Key";
CitiesComboBox.SelectedIndex = 0;
ProvincesComboBox.SelectedIndex = 0;
#endregion
#region Events
private void FunctionButtonsCon_OnExecuteClick(object sender, RoutedEventArgs e)
Save(Action, SessionHelper.MyUser.Id); //SessionHelper.MyUser.Id
private void FunctionButtonsCon_OnUndoClick(object sender, RoutedEventArgs e)
if (Action == ActionType.Insert)
Clearer();
return;
private void FunctionButtonsCon_OnBackClick(object sender, RoutedEventArgs e)
Exiter();
private void FunctionButtonsCon_OnDeleteClick(object sender, RoutedEventArgs e)
var ans = System.Windows.Forms.MessageBox.Show("Are you sure you want to delete this entry?", "Patient Deletion", MessageBoxButtons.YesNo);
if (!Equals(ans, System.Windows.Forms.DialogResult.Yes)) return;
Action = ActionType.Delete;
Save(Action, SessionHelper.MyUser.Id);
Exiter();
#endregion

Hello Kokombads,
I thought you are using MVVM from your title but it seems your project is just a simple WPF project. In that way, please check the following msdn article to know how to Implement Property Change Notification
https://msdn.microsoft.com/en-us/library/ms743695(v=vs.110).aspx
using System.ComponentModel;
namespace SDKSample
// This class implements INotifyPropertyChanged
// to support one-way and two-way bindings
// (such that the UI element updates when the source
// has been changed dynamically)
public class Person : INotifyPropertyChanged
private string name;
// Declare the event
public event PropertyChangedEventHandler PropertyChanged;
public Person()
public Person(string value)
this.name = value;
public string PersonName
get { return name; }
set
name = value;
// Call OnPropertyChanged whenever the property is updated
OnPropertyChanged("PersonName");
// Create the OnPropertyChanged method to raise the event
protected void OnPropertyChanged(string name)
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(name));
It is not so complex, you only need to refer to the interface from here:
https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx
And understand that you have to do the following:
For change notification to occur in a binding between a bound client and a data source, your bound type should either:
Implement the INotifyPropertyChanged interface (preferred).
Provide a change event for each property of the bound type
Best regards,
Barry
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Sharepoint 2013 Foundation three tier farm with two Webservers in NLB

Heloo,
I have been strugling with a problem the last htree days.
I have instelled and configured a sharepoint 2013 three tier farm with Sharepoint 2013 Foundation and MS SQL 2014 Express. This is a Test Farm and all the servers are Windows 2012 R2.
I have one SQL Server, one Application Server and two Webservers. The tow web servers are configured with Multicasting NLB. The NLB name is "sharepoint.ws.domain.net". The IP of the NLB is also in our DNS Zone.I have made a Web Application with
the name "sharepoint.ws.domain.net" on port 80 (NLB name) and a Site collection with the same name.
Now whene I am working on the Sharepoint Site I get very offen a login Window or I get the message "An error occurred while processing the request on the server. The status code returned from the server was: 0".
The error "An error occurred while processing the request on the server. The status code returned from the server was: 0" comes when I try to create a sub Site (most with no Permissions inheritance)... but not allways. I also get sometimes
the same message when I upload files (MS Office documents and PDF files).
The login Windows comes whene I am navigating throw the Sites... but also not allways.I go to the Site with an IE11 and the Site is also in the Intranet security sites.
Can you help me on this one...
Kind Regards
Ioannis Kyriakidis

With no hostname on the Web Application, you have to create Host-named Site Collections. So that complicates things a bit.
As far as NLB setup, you create Web Applications the same way you would otherwise. NLB is simply installed on both Web Servers and placed into the NLB VIP (virtual IP). The DNS A record points at the VIP.
Also set up your Windows NLB using Unicast instead of Multicast. If you have certain types of switches that block unicast ARP from multiple clients, e.g. Cisco, you may have to make an exception for them (e.g. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/107995-microsoft-nlb.html).
Trevor Seward
Follow or contact me at...
&nbsp&nbsp
This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Using eclipselink in a three tier

Hi, I'm using eclipselink in a three tier architechture. Normally this is set up with just one database user having a connection pool. What I want to set up is that all client users log in and get their own connection, so that they use their own database user account. So I need somehow to create an entitymanager that does not use a connection from the connection pool, but creates a connection using the credentials the user logged in the application with.
Can someone give me a hint how to achieve that?
TIA,
Tom

Hi,
You can customize the session to use the username and password for logging to database.Below sample code uses sessioncustomizer to customize the user credentials for database login.
If you are using the JDeveloper for Toplink development.
Open the persistence.xml in flat editor and select the Topink customization tab and select the below class for Session customization.Whenever application is run the database login will be customized to the passed in username and password values.
import org.eclipse.persistence.config.SessionCustomizer;
import org.eclipse.persistence.sessions.Session;
public class SampleSessionCustomizer implements SessionCustomizer {
public SampleSessionCustomizer() {
super();
public void customize(Session session) throws Exception {
session.getLogin().setUserName(userName);
session.getLogin().setPassword(password);
Hope this helps.
Regards,
P.Vinay Kumar

Three tier archictecture

I need assistance.. regarding three tier architecture... Presently I installed oracle 10g database on one server.. 10g AS(application server) on other and 10g IDS on client part... Please guide me how do I configure the system so that it will communicate... and work properly....

Hi,
You can find all the information you need at:
http://tahiti.oracle.com/
In the bottom of the page you have the AS options, remember to 10g you have 4 options:
- 10g Release 10.1.4
- 10g Release 10.1.3
- 10g Release 10.1.2
- 10g Release 9.0.4
Best Regards,
Francisco Munoz Alvarez
www.oraclenz.com

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