Three tier architecture

Hi
I am using a three tier architechure.
Client - Visual Basic 5 Application.
Middle Tier - Multi-threaded Server developped with java (jdk1.1.8)
Database: oracle 7.3.4.4
I am using jdbc 7.3.4
300 to 400 users are connected daily to this application (it is used by a call center)
from time to time and for no obvious reason the server is down and the users and unable to connect to the server (the connected users can no more process their requests). The server should be reinitialized in order to work again correctly.
This is causing a big problem because the call center cant work for 15 - 20 minutes each time it happens
somebody told me that using jdbc 8 with oracle 8 could solve my problem.
does anyone have any idea about this?
thx a lot

Let me make a guess here: Your middle and data tier are in some verson of windows right?
If it is let me ask how much memory is on each.
We had a similar problem and it came down to the simple fact that the OS or other MS Apps were leaking resources and we had to cycle the servers every so often to keep them running. Oracle 8x will not fix the problem if you are having OS leaks we've ran Oracle 7x and 8x now and both have been very stable with moderate to heavy use even on windows.

Similar Messages

SharePoint 2013 three-tier architecture

Hi all, I am going to install SharePoint 2013 in a three-tier farm environment.
I understand that the only difference between web server and app server is whether or not the "Microsoft SharePoint Foundation Web Application" service application is running or not. If yes = web server, if no = app server. App server is also where
CA is installed. Both web server and app server will have connection to DB. When web server serves web page requests from users, it will go to DB directly to get the page content.
However, the real three-tier architecture actually means that only app server should have access to DB. Web server will get the information it needs from the app server.
Is my understanding correct so far? Why is there a difference between three-tier architecture when it is applied in SharePoint context?

No, all SharePoint servers directly interface with databases for services that they host (with some exceptions). 3 tier just means you have a "WFE" which end users interact with, and it doesn't matter what services are on that "WFE",
another SharePoint server which may do the same or other things, but users don't directly interact with, and of course the SQL Server.
Trevor Seward
Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

How to install oracle applicatons in a three tier architecture

Hi,
i want to install oracle apps in a three tier architecture?
application tier -- middle tier
database tier -- database tier
Any steps or a meta link document
Regards
Sudharshan

Hi,
http://download.oracle.com/docs/cd/B34956_01/current/acrobat/120oaig.pdf
Pages 2-10 and Pages 2-19 don't specify this ???
They indicate only having to install with rapidwiz 1 time (as root user if appl/ora accounts setup) ??It is mentioned in Page 1-2
Release 12 utilizes the conf_<SID>.txt file in certain situations, for example where the database has not yet been created. The configuration file is also employed in multi-node (distributed) installs, where you only need to enter the install information once, on one machine, and can then copy the configuration file to other machines as required.
If you are installing in an environment where different machines are used to support the database and Applications tiers (as is typically the case), you would run Rapid Install on each machine in turn, starting with the database machine.
Regards,
Hussein

Pessimistic locking in a three-tier architecture

Hello,
we use a three-tier architecture to edit data in a database (Oracle 10g) with a rich-client application and we want to use pessimistic locking.
The client is communicating with a stateless bean on the application server (Jboss 4.2.3).
This bean-facade has methods for reading, writing and locking records that are transferred to the client encapsulated in entity beans.
The client controls the transactions as JPA-User-Transactions.
The methods in the container managed bean have the transaction attribute REQUIRED.
Before doing any modification on the client a method setLock() is called in the bean to lock the records in the database.
The lock is implemented with query hints:
Query query = em.createQuery("select e from Person e WHERE e.id = 252");
query.setHint(QueryHints.PESSIMISTIC_LOCK, PessimisticLock.LockNoWait);
So much for this theroy...
Practically we can set a lock on a record in the database.
But removing the lock is working when changing and committing the record only.
The record remains locked if performing a rollback or a commit without any changes.
Any idea what's missing in our implementation?
Our approach should work - theoretically...
Thanks in advance for any hint
Best regards,
Martin Kubitza
T&P, Bochum/Germany

Thank you for the hint on JPA - we are analyzing this now.
Meanwhile we tried something "easier": Optimistic locking
Optimistic locking works well with a version-column and the @VERSION annotation. But we get a problem with the @OptimisticLocking(type = OptimisticLockingType.ALL_COLUMNS annotation (see Optimistic Locking with OptimisticLockingType.ALL_COLUMNS
We are using Eclipselink V1.1 and (now) a bean managed transaction type)
Martin Kubitza
T&P, Bochum/Germany

Question about three-tier architecture for MI

Hi,
my question is just for the right understanding. If we speak about three-tier architecture of MI is it right, that the following is meant:
Client = Presentation Tier
Middleware = Application Tier/Logic Tier/Business Logic Tier
Backend = Data Tier
Thank you and regards,
Florian

Hi Florian,
ICF (Internet Communication Framework) is actually a framework provided by any WebAS. MI makes use of this to receive/send the data from/to the client. It is referred to as ABAP Sync Service in MI terminology. Data comes in the form of HTTP stream. A service is created to provide this functionality. It performs the same job as of the J2EE engine in the earlier versions. The advantage being that an intermediate component between the client & middleware is not necessary anymore, because ICF is part of the WebAS itself.
You can have a look at this in the sicf transaction, provide the service name as MJC, under this u can see that there are 3 services which MI uses - mi_host, mi_service & mi_mds.
You can set these parameters in the mobileengine.config file to make the client connect to ABAP Sync Service.
MobileEngine.Sync.Gateway.Service=/sap/bc/MJC/mi_host
MI.Sync.ProtocolVersion=251500
I am in the process of writing a blog, please wait for it.
Regards,
Nameeta

Servlets in three tier Architecture

Hi
We plan to use a three tier architecture with
Client --- Applet (JDK 1.2)
Middle tier -- WebServer and servlets
Database Server -- Oracle 8i
Our application should have data entry for several (5 - 12 ) tabs each consisting of around 15 fields . A few Jtables will also be used .
Arounf 5 to 10 validations or queries are required to be done with the database in the applet. Around 300 entries will be made by 12 different users in a day.
Is it advisable to use the above architecture ?
Is it required to use Enterprise JavaBeans ?
Will the use of servlets bring down the performance?
Overall is our architecture feasible for the requirement ?
We will be greatfull to your suggestions
Please also mail to [email protected]
N.Suresh

Hello,
We plan to use a three tier architecture with
Client --- Applet (JDK 1.2)
Middle tier -- WebServer and servlets
Database Server -- Oracle 8i
Our application should have data entry for several (5 - 12 ) tabs each consisting of around 15 fields . A few Jtables will also >be used .
Arounf 5 to 10 validations or queries are required to be done with the database in the applet. Around 300 entries will be made >by 12 different users in a day.Have you considered using Business Components for Java to develop your application? From what you have described about your application BC4J seems to be the ideal candidate.
Is it advisable to use the above architecture ?I see not limitation with your architecture. The only thing to keep in mind is that you should use applets only if you absolutely need to. Overall development and maintenance is much easier if you are just using servlets and JSPs.
Is it required to use Enterprise JavaBeans ?See below.
Will the use of servlets bring down the performance? No.
Overall is our architecture feasible for the requirement ?If you had not needed applets then I'd have recommended the following:
Scenario #1
Client --- Browser
Presentation Server -- Standard WebServer(Apache,OAS etc) running Servlets, JSPs talking to BC4J classes available on the local classpath
Database Server -- Any Oracle Database
Simplicity and ease of maintenance are some of the benefits of the above model. The limitation in the above scenario is that you cannot have a thin remote client(Java application or applet).
If you want a remote client then I'd recommend:
Scenario #2
Client --- Browser|Applet (if you know you have a small number of users then you can go for a client side Application too)
Presentation Server -- Standard WebServer(Apache,OAS etc) running Servlets, JSPs
Application Server -- Standard AppServer (VisiBroker|OAS|JServer) running BC4J components as EJB session beans or CORBA server objects
Database Server -- Any Oracle Database
In this scenario the servlets|JSPs will be going over IIOP to talk to the application server. On the client side, the BC4J framework ensures that the network traffic is minimized and also the client side Java application or applet is as thin as it can be.
Whether you go with scenario#1 or scenario#2 the cool thing about using BC4J is that you have to write your business logic only once and then you can deploy it in multiple platforms(local,EJB,CORBA) and access it from different clients(JSP,Servlets,Java,XML...) without modifying your business logic.
Hope this helps.
Please let me know if you have any questions.
Regards,
Arun
null

Java applet three tier architecture

hi
i am developing three-tier architecture in java.
front-end is applet .when button is clicked events are generated , these events passed the parameters to JSP file and these jsp file is getting the data from remote database
and which is sent back to applet .this is my concept.
when i am trying to develop this application i am getting some problem what the problem is acess denied from remote database .
so please guide me in this issue.
have a nice day
bye
Prakash

Satish Shenoy (guest) wrote:
: I wanted to know about three tier architecture.
: I asked many people but couldn't get a proper answer.
: Can anoyone give me some information about it.
: Thanks in advance,
: Satish
Satish,
3 Tier architecture is essentially holding different parts of an
application on different tiers, typically the database is stored
on one tier, the business logic (and maybe the application) are
stored on the middle tier and the GUI is found on the client
tier. In oracle speak this translates into a data server, an
application server that delivers a Java application to the
client. N-Tier architecture is a natural progression to this,
where the middle tier can be split into multiple distributed
application servers.
You could say that client-server is 2-tier architecture.
Hope this helps
Steve
null

Three tier architecture using oracle dev suite 10g & oracle database 9i

hi ,
I am trying to build a software which will manage the database of a hospital through usual form design .
The tools I am using for these are
(1) oracle server database 9i (2) oracle developer suite 10g (3) windows xp professional service pack 2 .
I have designed the form modules in developer suite , created the tables in the database , connected those tables to the form modules using dml statements, now data can be inserted , updates and deleted through the form design . I have also deployed the forms using "run forms through web" and thereby other computers connected to the main computer through lan can also access the software using the web port address and the name of form to be used , these computers are not having oracle developer suite or oracle database installed , but they can access the software through the browser .
In this scenario my question is that , is this a three tier architecture as oracle database is the first tier , oracle developer suite is the middle tier where I am puting all the bussiness logics and oc4j instance is used to connect the database and the dev suite , and for user interaction we have the browser as the third tier ?
or this is a two tier architecture ? if this is a two tier architecture please let me know how can I implement a three tier architecture using oracle developer suite 10g and oracle server database 9i .
Thanks a lot for showing ur interest to read this

You need Oracle Application Server to deploy the forms when you go live.
What you are currently using OC4J which came in the developer suite. It is used only for development purpose and can not have capacity to handle higher load.
3 tier arch
1. Thin Client :-> Browser
2 Middle tier -> Oracle Appln Server /OC4j(in ur case)
3 Database Tier -> Oracle Database
Rajesh

Three tier architecture questions

Hello,
My question is in regards to using Toplink in a three tier architecture situation. If I wish to send an object A which has a collection of Bs and B has a collection of C ( A nested object structure with two or more levels of indirection). Is the best solution to have the named query be part of a unit of work so that even if on the client side somebody unknowingly were to make the modification to one of the entity objects ( a POJO) the shared session cache would not be affected ?
This is assuming the client side HTTP layer and the RMI/EJB layer are on different JVMs.
Some of the other suggestions I have heard is to retrieve it from the shared session cache directly and if in case I need to modify one or more of the objects do a named query lookup on that object alone and then proceed to register that object in a unit of work and then commit the changes.
Also the indirection would have to be utilised before the data objects are sent to the Servlet layer I presume ?(That is if I do a a.getAllOfBObjects() on the servlet side I would get a nullpointer exception unless all of B were already instatiated on the server side). Also when the objects are sent back to the server do I do a registerObject on all the ones that have changed and then do a deepMergeClone() before the uow.commit() ?
Thanks,
Aswin.

Aswin,
If your client is remote to the EJB tier then all persistent entities are detached through serialization. In this architecture you do not need to worry about reading and modifying the shared instance as it never the one being changed on the client (due to serialization).
Yes, you do need to ensure that all required indirect relationships are instantiated on the server prior to returning them from the EJB call.
Yes, you do need to merge the changes of the detached instance when returned to the server. I would also recommend first doing a read for the entity being merged (by primary key) on the new UnitOfWork prior to the merge. This will handle the case where you are merging into a different node of the cluster then where you read as well as allowing you to check for the case where the entity no longer exists in the database (if the read returns null then the merge will result in an INSERT and this may not be desired).
Here is an example test case that does this:
    public void test() throws Exception {
        Employee detachedEmp = getDeatchedEmployee("Jill", "May");
        assertNotNull(detachedEmp);
        // Remove the first phone number
        PhoneNumber phone = detachedEmp.getPhoneNumber("Work");
        assertNotNull("Employee does not have a Work Phone Number",
                      detachedEmp.getPhoneNumber("Work"));
        detachedEmp.removePhoneNumber(phone);
        UnitOfWork uow = session.acquireUnitOfWork();
        Employee empWC = (Employee) uow.readObject(detachedEmp);
        if (empWC == null) { // Deleted
            throw new RuntimeException("Could not update deleted employee: " + detachedEmp);
        uow.deepMergeClone(detachedEmp);
        uow.commit();
     * Return a detached Employee found by provided first name and last name.
     * Its phone number relationship is instantiated.
    public Employee getDeatchedEmployee(String firstName, String lastName) {
        ReadObjectQuery roq = new ReadObjectQuery(Employee.class);
        ExpressionBuilder builder = roq.getExpressionBuilder();
        roq.setSelectionCriteria((builder.get("firstName").equal(firstName)).and(builder.get("lastName").equal(lastName)));
        Employee employee = (Employee)session.executeQuery(roq);
        employee.getPhoneNumbers().size();
        return (Employee)SerializationHelper.serialize(employee);
    }One other note: In these types of application optimistic locking is very important. You should also make sure that the locking field(s) are mapped into the object and not stored only in the TopLink cache. This will ensure the locking semantics are maintained across the detachment to the client and the merge back.
Doug

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

I am a student and I am confused on using the INotifyPropertyChanged in a three-tier style of coding. Can you guys help me a bit with these?
I have a solution named MetroAppProject. It is composed of four projects (I omitted the using clauses and references, just imagine they are there and are working fine):
1. MetroApp.BluePrints - a class library composed of the classes in my sql db
An example of my class
namespace MetroApp.BluePrints
public partial class Patient
public long Id { get; set; }
public string PatientNumber { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string AddressLine1 { get; set; }
public Nullable<short> CityId { get; set; }
public string CityName { get; set; }
public Nullable<short> ProvinceId { get; set; }
public string ProvinceName { get; set; }
Then the second project:
2. MetroApp.DataAccess = a class library composed of methods that calls my sql procedures. I used the SqlHelper class which contains the connection strings and other stuffs.
example class
namespace MetroApp.DataAccess
public class PatientDb
public Patient Retrieve(PatientParams parameters)
SqlCommand command = new SqlCommand();
Patient singItem = new Patient();
command.CommandText = "RetrievePatients";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@Id", parameters.Id).Direction = ParameterDirection.Input;
DataTable dt = SqlHelper.GetData(command);
if (dt.Rows.Count > 0)
DataRow row = dt.Rows[0];
singItem.Id = TDefaultValue.GetInt(row["Id"].ToString());
singItem.PatientNumber = TDefaultValue.GetString(row["PatientNumber"].ToString());
singItem.LastName = TDefaultValue.GetString(row["LastName"].ToString());
singItem.FirstName = TDefaultValue.GetString(row["FirstName"].ToString());
singItem.MiddleName = TDefaultValue.GetString(row["MiddleName"].ToString());
singItem.AddressLine1 = TDefaultValue.GetString(row["AddressLine1"].ToString());
singItem.CityId = TDefaultValue.GetShort(row["CityId"].ToString());
singItem.CityName = TDefaultValue.GetString(row["CityName"].ToString());
singItem.ProvinceId = TDefaultValue.GetShort(row["ProvinceId"].ToString());
singItem.ProvinceName = TDefaultValue.GetString(row["ProvinceName"].ToString());
return singItem;
public List<Patient> RetrieveMany(PatientParams parameters)
var items = new List<Patient>();
var command = new SqlCommand();
command.CommandText = "RetrievePatients";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@Id", parameters.Id).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@PatientNumber", parameters.PatientNumber).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@LastName", parameters.LastName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@FirstName", parameters.FirstName).Direction = ParameterDirection.Input;
command.Parameters.AddWithValue("@MiddleName", parameters.MiddleName).Direction = ParameterDirection.Input;
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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Three tier architecture with OBIEE 11g

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With 10g, there was option to install plug in for IIS or j2ee container in web server and connect to BI server in application zone. With this BI environment can be secured behind firewall and allows to implement 3 tier architecture.
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We want to generate and save report directly to a location on client machine.
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Av.

Hi,
We are aware of this method, but this is causing following problems to us -
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Hi There,
I have the following scenario to connect to Oracle 12c database on EPIC
1. The Client Desktop: It has a Windows 7 as OS and should Connect to database via SQL Developer, MS Access.
2. The Web Tier: It has Windows 2012 R2 with IIS 8.5 as OS and should connect to database via ADO.NET
3. The App Tier: It has RHEL 6.5 as OS with Korn shell and Pro*C executables and should connect to database via Shell Scripts / OCI etc.
4. The DB Tier: Where Oracle 12c resides on OVM/OEL
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Ming Man

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Hi friends,
I am planning to implement oracle three tier architecture and want to know -
How the oracle three tier architecture should be configured on a network?
As per my information :
Database Tier : Oracle 9i server database on a machine
Middle Tier : oracle 9i AS as middle tier on a machine
Client Tier : what software should be installed on client tier?
As middle tier need
Pentium 300MHz,6GB hdd space,512 RAM
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1. Use 10g Application Server - You have to install the Enterprise version for forms & reports servers - you can choose to not configure the pieces you don't want to use as part of the setup though.
2. Java plugin is more mature than the jinitiator. Java plugin works on more systems and is much quicker since its much newer than the 1.1.8 and 1.3.x version oracle provides - Sun or IBM jvm's work great.
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In my experience give your "power" users (the ones running your business apps) the POWER they need to get the job done right and they will appreciate the new systems you implement rather than fear them. A PC upgrade is alot easier then months and months of headaches with people complaining about response times, load times, performance and application useability.

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

Three tier architecture

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