3 Tier And Related Tables
Dec 14, 2010I downloaded a 3 tier sample code , but that has no code for related tables, I am trying to complete this.
These are the tables and part of the sample code
[CODE...]
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How Update Two Related Tables
Dec 11, 2010i would like to know where is a sample code programmed in 3 tier or n tier to update 2 related tables.
View 7 RepliesDB/Reporting :: Query On Related Tables?
Nov 15, 2008I have a simple "two-tables" database (SQL EXpress) and a very simple application (VB 2008 Express). The two tables are customer and order and their structures are:
customer(IDcustomer, LastName, FirstName) IDcustomer=primary key orders(IDord, Number, Description, IDcust)
IDord=primary key the tables are related (IDcustomer-->ID cust)
In VB2008 environment I create a dataset, by means of Data Source Configuration Wizard, which encompass both customer and order tables (xsd file). By opening xsd file I set the relationship in the following manner:
"Both relation and foreign key constraint"
Update Rule = Cascade
Delete Rule = Cascade
In my form I show customer table in detail-mode and orders table in datagridview-mode. Two Fill method are created in the Load event and they work correctly.In "CustomerTableAdapter" I create, with QueryBuilder, a search query (say LastName query) and I write the following code:
Private Sub frmSearch_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.CustomerTableAdapter.FillByLastName(Me.CustomerOrdersDataSet.custom er, "D") 'All Lastnames with first letter = D
[Code]...
Delete Records From Related Tables
Jun 6, 2011i have 3 tables in ms access that is patient , NOK,and admission they have related fields, i am using vb 2005. when i delete a record from the patient table i want the related records from the other tables to be deleted.
View 1 RepliesRelated Tables Update From Datagridview
Mar 1, 2010[code]I'm able to display Data from the tables to Datagridview but how do I update two tables from Datagridview?For some reason under Advanced Options Generate Insert, update and delete statements gets unchecked.
View 4 RepliesSaving Related Tables And Querying Them?
Nov 9, 2009I am having a problem saving related tables and querying them. I have both data binding sources on the form and I have both being added, end edit, and both being saved. When I "view all" and click on the related table "crimes" they're not showing with the Inmate that committed them. I have gotten it to do this with a code similar to that below and I am wondering what I'm doing wrong so that the datagridview for crimes will display the correct crimes for the correct inmate. The primary key for inmates is DOC# and the Primary Key for Crimes is "Entry ID"
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Me.Validate()
[Code].....
VS 2010 Primary Key & Related Tables
May 20, 2011Is there a way to modify the text of a primary key and not have it delete all the following rows in other tables related to it?
View 6 RepliesRelated Tables Data Entry Form
Oct 19, 2011I have a Microsoft Access database that has one-to-many relationships. When I created the tables for the database, I did not enter any data into any records, as that will be done by the application user. My problems is when data is entered into the parent and child tables, the parent table data is the only one that gets saved when clicking the save button on the binding navigator.If I have the parent and child tables data entered the same way a user would prior to connecting the data source and add EndEdit() to the child table BindingSource in the BindingNavigator click event, everything works exactly the way I want it to.This application is a data entry form, so it wouldn't make sense to have to have data entered in tables prior to adding the data source to my project. What is the best way to create a data entry form with one-to-many relationships? [code]
View 6 RepliesShow Data From Two Related Tables In A Datagridview?
Dec 21, 2010I am trying to produce a form in VB2008 which shows data from two related database tables, and then allows the data in one of the tables to be updated. I would like to do this using a DataGridView, but I have no idea how I would go about this.
View 4 RepliesSql - Delete The Contents Of A Related Record From Two Tables?
Dec 11, 2011The StudentDetails.Students is the master table which forms a relationship with RegistrationDetails.Registration. Therefore, StudentID is the primary key in the former whereas it is a foreign key in the latter.Now I've tried each of the following codes but each of the first two gives an error message "Incorrect syntax near 'a'" and in the case of the third one DbTransaction as in "Dim trans As DbTransaction" is also not a valid type. I'm using SQL Server 2008 Professional Edition.
cmd = New SqlCommand("DELETE FROM StudentDetails.Students a, RegistrationDetails.Registration b WHERE (b.StudentId=a.StudentId) AND a.StudentId='" & txtStudentID.Text & "'", cn)
[code]....
VS 2010 Save Data In Two Related Tables
Feb 16, 2012I have a database created using sql server express 2008. There I have two tables called tbl1 and tbl2, which are related as tbl1.CityNumber=tbl2.CityNumber.
I have created the programme using VB 2010; there, a form has three textboxes.
Tables: tbl1,tbl2 ; (related as tbl1.CityNumber=tbl2.CityNumber)
Columns to be updated:tbl1.CityName , tbl1.CityNumber, tbl2.StreetName
TextBoxes on the VB form: txtCityName , txtCityNumber, txtStreetName
[Code]....
But, now the problem is, the two tables have not get updated,after going to the database in MS.SQL Server Management Studio. I think I'm very closer to have my required result. I have tried my best to track place,where I've gone wrong.I have been trying to find a method for last five days.
Winforms - Bind A ComboBox To Related Tables?
May 14, 2012I am developing a Windows Form Application against a SQL Server relational database. An example of the database schema is:
TableA
------------------
PK A_ID uniqueidentifier
A_NAME varchar(254)
[code]....
In the form I have a ComboBox (cboA_ID) to select the TableA record (DataSource = TableA, DisplayMember = A_NAME, ValueMember = A_ID) and a TabControl where controls on each tab are bound to fields in either TableB or TableC.My question is, is it possible to bind cboA_ID to TableB.A_ID and TableC.A_ID?This is my first database application so if there is a better way to do this I'm all ears. I have set everything up using the wizards in Visual Studio 2010, so I'm still not 100% familiar with what all the various TableAdapters and DataSets do.
Create A Database That Uses Object Dependencies For Five Different Related Tables?
Feb 9, 2011I have trying to create a database that uses object dependencies for five different related tables.
View 1 RepliesDelete Contents Of A Related Record From Two Tables( Using SQLTransaction)?
Dec 15, 2011I'm getting "Format of the initialization string does not conform to specification starting at index 0" error having used the following code. The commands are supposed to delete a related record from two tables namely StudentDetails.Students as the master table and RegistrationDetails.Registration as the child table. [code]...
View 1 RepliesVS 2008 Error - Related Tables - Can't Update Records
Mar 1, 2010Using a datagrid, binding to one table, and related to one combobos, I cant update records, cause gives me a violation error. I'm not changing the primary key, so, I dont undersatnd cause this happen. I prepair a example of this error, and it was attached to this message.
View 5 RepliesFill Up A Data Grid View With Records Of Two Related Tables?
Mar 16, 2010I try to fill up a data grid view with records of two related tables. Beneath you can find the code I use to handle this.
The first table �GemeentenT� has the following columns.
GemeenteId Primary key
GemeentePostnummer
GemeenteNaam
[Code].....
Export To Excel 3 Related Tables Into Excel?
Aug 22, 2010I'm a beginner to VB.net. I have 3 table (Torder, Titem, Customer)Table structure as below.
Order.dbf fields (OrderNo, CustCode)
Titem.dbf fields (OrderNo, Itemno, product)
Customer.dbf fields (CustCode, CustName)
Torder related to Titem via Order No. Customer related to Torder via CustCode. How to output data to excel sheet in this format?
N- Tier Architure In .net?
Dec 7, 2011I want to understand N-tier architecture and example of application for same.
View 5 RepliesBuild N-Tier Web Application?
Oct 14, 2009Im trying to build my first N-Tier web application. And it seems like im doing it wrong. Ive been kinda working out of this book, but to me it doesnt seem like the right way to do this. In the book the guy builds User and Data centric objects but everywhere I see ntier everyone is always talking about BLL and DAL ive seen nothign on UC and DC objects.Right now I have Interfaces and serializable structures, user and data centric objects. The data centric object does all the validation and connecting to the db, as well as returns any violated rules, but when I once i started pulling it all together it just doesnt seem right.Ive already wrote a ____ load of code and now am kinda stuck. I dont know if i am doing this right and dont want to continue writing any code if this is all messed up.Ive been reading as much as humanly possible and im still just a little confused. I mean I understand the concepts of seperating the logic into different layers and tiers and all that but as far as my implementation of that I just feel somethings a bit off.
View 3 RepliesCreate An N-tier Application?
Dec 12, 2009I have a solution and I want to divide it up into Business Tier, Data Tier, etc. I think I have to do this by creating a project that contains the data source, another with the forms, etc. Every time I try to add a new project, it literally opens a new project, seperate from the first.
View 1 RepliesN Tier Development For Win Forms?
Apr 27, 2010I usually create N Tier applications with ASP .Net applications as per the advice at ASP .Net (data tutorials). Recently ive tried to create an N Tier Windows Form database application and found the method im use to (i.e. ASP .Net) doesnt really work (unless i was doing something wrong).
View 7 RepliesVS 2008 Creating An N-Tier?
May 20, 2009I'm creating an N-Tier (or at least I think its N-Tier!) solution where I have the following:
WPF client side application (presentation layer)
WCF service hosted in a windows service (data access layer)
SQL database (data layer)
Now bearing in mind this is the first time I've tried to design anything like this, I might be going about it completely the wrong way...I've created 3 examples classes that would be my 'business objects' (im not quite sure where that fits in within the layers I listed above, because these business objects would be defined in a DLL that would be used by both the presentation layer and the data access layer). You can see them here:So then in my WCF service (data access layer) I would have methods like this that would be exposed to the WPF client:These are just examples but you get the idea. Is this the right way to do something like this?I saw one design that someone had posted somewhere that basically looked to me like it merged the Business Objects and the DAL together because in their class that represented an order, they had properties like you would expect for Order Number etc etc but then they also had methods like "GetOrders" within there too.I dunno I'm still very new to this type of design but I thought that the idea of the business objects was that they just represented business items, such as orders etc, so I thought they would just purely hold properties/fields and no methods or anything like that
VS 2008 Two Tier Application Over The WAN?
Oct 16, 2011i am on a project of two tier application with VB.NET + SQL server R2. except desk top applications i never done networked applications + i don't know asp.net
i require advise in few areas
(1) is the encryption required
(2) what are the security measures i must take in terms of connection security
(3) how to use the server effectively with out putting much burden through good client end design
(4) any other guide lines / pit falls
(5) should i continue with vb.net or must & should switch over to asp
(6) what should be the minimum configuration of client system,
(7) Preferable is the thin client systems , is it possible to use thin clients
Add Records Using N-tier And Stored Procedure?
Sep 7, 2010how can i add records using n-tier and stored procedure""
View 1 RepliesAsp.net - 3 Tier Application Pattern Suggestion?
Apr 12, 2010I have attempted to make my first 3 tier application. In the process I have run into one problem I am yet to find an optimal solution for. Basically all my objects use an IFillable interface which forces the implementation of a sub as follows
Public Sub Fill(ByVal Datareader As Data.IDataReader) Implements IFillable.Fill
This sub then expects the Ids from the datareader will be identical to the properties of the object as such.
Me.m_StockID = Datareader.GetGuid(Datareader.GetOrdinal("StockID"))
In the end I end up with a datalayer that looks something like this.
Public Shared Function GetStockByID(ByVal ConnectionString As String, ByVal StockID As Guid) As Stock
Dim res As New Stock
Using sqlConn As New SqlConnection(ConnectionString)[code].....
Mostly this pattern seems to make sense. However my problem is, lets say I want to implement a property for Stock called StockBarcodeList.Under the above mentioned pattern any way I implement this property I will need to pass a connectionstring to it which obviously breaks my attempt at layer separation.how I might be able to solve this problem or am I going about this the completely wrong way? I am deliberately trying to avoid using the dataset in any form.
Asp.net - Use Abstract Classes In A 3-tier Solution?
Feb 1, 2012My immediate issue is that currently I have a 3 tier solution (Presentation.aspx.vb calls BusinessLayer.vb which calls DataAccessLayer.vb). However, I want to make BusinessLayer and DataAccessLayer.vb abstract classes because several Webforms will use have the same functionality.
So I currently am doing this (no abstract classes):
'Presentation Layer (pseudocode)
public sub checkUser(byval userName as string, byval dept as string)
dim isGood as boolean = BL.checkUserAccess(userName, dept)
[Code].....
C# - Which Options Are Ther To Set Up Your 3-Tier System
Jul 29, 2010Which options are there to make your 3-Tier System.Client / Common / Server Now we work with the entityframework and agatha. But are there other options to make a good 3-Tier system?
The agatha framework, makes for us the request/response on the common site. On the server site the response will be filled in. But are there other framework to do all that work for you? Or should you do it without such framework. And call at the server site stored procedure? Or with LINQ? With the agatha we query the repository's with some LINQ queries.
But i am wonna know if there are other ways to do the communication. Maybe there are other and better ways to do it. I hope i get some usefull answer. Where i can read some new things.
Entity Framework, 3-tier Architecture?
May 23, 2011I have a large application that has always existed all in a single .NET project up until recently (200,000+ LOC). I'm finally getting to the point where I can fix this. I just started using the Entity Framework (4.1 using code first) and I believe this is a good time to start seperating my logic.
What I did is I separated my application into three subprojects:UI - Windows forms project Business - The POCO classes Data - Legacy data access code AND the DBContext class to connect my POCO classes to the database. I also have a Windows service project and will soon have a WCF project, but those concern me less.
The problem is that in this plan, the data layer depends on the business layer and vice versa causing a circular reference error. There is no way around this.So, my idea is to move my POCO classes into the data layer removing all business logic first (just keeping the database fields, basically). Then, I will inherit from those classes in the business layer adding back all the business rules. Then my data access layer will not rely on any other project, the business layer will rely just on the data access layer, and the interface layer will rely on both for now but eventually only on the business layer.
Does anyone see any problems with this, or a better way of doing things given my current circumstances?
Link For N Tier Development Sample ?
May 20, 2010I am trying to develop in my pc this basic 3 tier solution out of these links [URL] and [URL]
I have problems because the dataset in one part is OrdersDataSet.xsd, as said in the link ,but some lines bellow in the code show me this lines:
Imports ta = NorthwindDataSetTableAdapters
Partial Public Class NorthwindDataSet
Private taOrders As New ta.OrdersTableAdapter
[CODE].........
When i put this in the code it tells me an error message simmilar to this the namespace does not exist or do not have a public member.
Populate RadioButtonList Using 3-tier Logic?
Oct 21, 2010The below code doesn't work becuase I need to somehow feed the DataText and Value fields. I need to somehow amend the code to allow me to populate my RadioButtonList and to fit inside my 3-tier architecture. My first time doing this so I'm a little lost.
' rblAnswers.DataTextField = dt.Columns(1).ToString
' rblAnswers.DataValueField = dt.Columns(0).ToString
'Calls
[code]....