Creating The Table Relationships?
Apr 23, 2011
I am working on a VB.net (VS-2010, Win XP Pro 2 SP3), Employee Management Project. I need to keep track of Employee Leave Attendance and also each Equipment assigned to an Employee. How can I achieve this using SQLlite.
It will be very useful if you could provide me with examples as I am completely new to the field of SQL and VB.net I think this can be done with two tables where one has the primary key while the other has a foreign key, but I am not sure. Also how many tables will I need for storing data in Leave and Equipment Form.
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Jun 10, 2011
i have code to produce a database and tables but now i am looking 4 code 2 add relationships to the tables i would have made
[Code]...
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Apr 14, 2011
I'm using a Data navigator to navigate (duh) through some records that my BLL fetches from the DAL. I use DataTables to fetch the recrods. Some of such records have one to many relationships. Lets say for example a person has may telephone numbers and my navigator goes through all the persons whose name are Joe. So I manage to show all the Joes through my navigator in the controls but I want to be able to show all their telephone numbers also. Persons is one Table, TelephoneNumbers is another. Each Telephone number has the person it belongs to. I access them through a DataSet and my BLL controllers return DataTables in their search methods, as said.
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Aug 24, 2011
I have 2 entities that are related, but the legacy sql schema essentially has 2 key columns for the same table (not a 2-column key: see below). I need to create a relationship back to the 'faux key' column. Is there a way to do this declaratively in Entity Framework 4.1?
Public Class Client
Inherits ModelBase
<Key(), Required()>
Public Property ClientID As Decimal
<Required(), StringLength(50)>
Public Property ClientCode As String .....
And the error I am getting is:
One or more validation errors were detected during model generation: System.Data.Edm.EdmAssociationConstraint: : The types of all properties in the Dependent Role of a referential constraint must be the same as the corresponding property types in the Principal Role. The type of property 'ClientCode' on entity 'ClientLocation' does not match the type of property 'ClientID' on entity 'Client' in the referential constraint 'ClientLocation_Client'.
Because it thinks I'm trying to map ClientLocation.ClientCode > Client.ClientID, when I am really trying to map ClientLocation.ClientCode > Client.ClientCode...
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Jul 12, 2009
Current i'm developing an application track storage of an item.in it abusiness rule says an item can be moved to more than one warehouses. Also i need to keep the history of the Item's history, Thereefore i need to create two entities,"Warehouse" and "ItemsHistoryOfLocations". I have developped an static class diagram to show the relationshop.These are the relationship rules between the classes:
1. A warehouse could be in an Item's History of locations.
2. A warehouse could be in many Items' History of locations.therefore in the forward relationshop -- 1..*
3. In an Item's History of locations, there must be at least one warehouse4. In an Item's history of locations, there can be more than one warehouse
Therefore in teh backward relationship -- 1..* Therefore the relationship betwween teh classes is a M:N. In another Object oriented scripting languaage when ever, and M:N relationship is found between classes, their relationship is slit and put a collection class called "MemberKeyDictionaries" as the bridging entity.But in C# / VB, should we create these collection classe. IF NOT, then how should i modify my class diagram to implement this M:N relationship? and h0w do i implement this M;N relationship in code?
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Aug 6, 2009
I have two tables, Clients and Administrators, which are linked in a many-to-many relationship by the table ClientAdministrators. In the real application this works fine and I can get a list of Administrators for my Client. My problem comes in trying to unit test the service class that is retrieving this from the repository. I have a FakeRepository class which implements my repository interface and I have several internal lists of objects for the service class to query against.
[Code]...
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May 7, 2012
I'm developing a business model for an application where I am representing physical entities. The hierarchy created from this is neat, but as I'm doing this, I'm beginning to think about things like, what properties should be included in one that may already be apart of another? Or what if some properties are expected to be in one object, but another object needs to return that value, how does it communicate that request through the hierarchical chain? And what is the best practice for this design?
[Code]...
But then I got to thinking, what if I have a ConnectionPoint entity and I want it to return which Panel it has? Should it have it's own Panel association as well? Or should there be a method/pattern for communicating the request up the chain? And again... what's typical best practice?
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Jan 10, 2009
In VB6, if you put a picturebox on a form and then put a control inside the picturebox, then the control would be a child of the picturebox. Its location would be relative to the picturebox and not the form.If you do the same thing in VB 2005 Express , the control seems to still be a child of the form and not the picturebox (i.e. its location property is relative to the form).Is there any way to make a control or graphic inside a picturebox a child of the picturebox and not the form?
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Jun 15, 2009
i'm having trouble with the relationships in VS when relating from long to Autonumber.I got an answer that fields should be declared integer, but ACCESS explicity states that fields realting to autonumber must be delared long.
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Nov 9, 2010
I have Access as my back end. Student is the database name and its path is c:Projectstudent.mdb And am having few tables in it. When i click a command button in vb.net a new table must be created in the path mentioned. And it should have the fields I declare. What s the query I need to use ? Is it possible to do like that ?
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Apr 24, 2012
I have code in vb.net that was created using Visual Studio 2008. It has got queries done via data sets and table adapters. dsStagMyfileDesigner.vb and dsStagMyfile.xsd are the files having all the sql queries. They are code generated by using data table adapters I believe. Editing them might screw the system.
[Code]...
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Feb 23, 2012
This is what I initially tried but it gives me error.
[Code]...
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Jul 17, 2009
Below is my code for creating a database and then, from there i hope to be able to create more than one tables in the same database that i just created. But for some reason, Visual studio 2005 keeps reminding me that the SqlCeException was not handled or mishandled. Error lies in the "sqlCreateTable.ExecuteNonQuery()"[code]Actually i heard from someone that you can actually create all the tables that you need such as "Login", "Order" and so on in a single windows form(in form_load) , which will load up all your table and create them for you if that window form is the first object to start running in the order.
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Oct 28, 2009
i have this loop i need to create a table at run time for these values in this loop
For b11 = 0 To n - 1
Dim tableofsports As New Table
MsgBox(sporttype(b11).ToString)
[Code].....
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Jan 23, 2009
I currently have this code to create an asp table [code]where PH is my placeholder for the table to appear in.This code creates a 1 celled table how do i get it to create multiple rows and cells?
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Feb 9, 2008
I am trying to create tables according to the user input, search for the name input by the user if it does not exist i will create it within the databasei have read the topic writtin here which is similiar to the one i am trying
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Mar 24, 2009
I'm creating a table with the CREATE statement and it is working fine, but I have to lopp thru one of the columns. I have a value on variable and I will have to create the column depending on the variable value. Here is my code. I need to loop thru the Rnd column renaming it like this
[code]....
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Oct 13, 2010
I am trying to make an program that when it starts it will check an table in the database for what buttons it should add. It can be at the most 60 buttons presented on the screen, i am trying to get the datagridview to handle this. But my main problem is that the buttons get displayed in columns, i would like the buttons to appear like the attacment (more or less)
[Code]...
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Mar 26, 2010
I am a new user of Visual Studio 2005. I am looking to create a pivot table for data in my excel spreadsheet using Visual (Basic) Studio 2005. I am getting an error in the following two lines of code, which work fine when I use Visual Basic 6.0 but not with Visual basic that comes with VS 2005. Can anyone let me know why the error occurs and what the correction should be?
[Code]...
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Sep 10, 2011
error Public member 'Tables' on type 'ApplicationClass' not found when trying to create the table.The error occurs at the line
Dim tlb
As Word.Table = objWord.Tables.Add(NumRows:=4, NumColumns:=3)
My import statements include
[code].....
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Oct 19, 2009
I am trying to create a table in VB, with the datatype or Rowversion(TimeStamp) for SqlCe.I can not set the .datatype to SqlDataType. Timestamp, gives an error, but I dont see it, main form just loads, bypassing all breakpoints.Is there a way to set the datatype using .net or am I going to have to do Sql Statements?
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Sep 22, 2009
I'm working with Microsoft Word and trying to generate a table with headings that may span one to three columns. I'm having trouble figuring out how to do this. The table should look something like the following:Counters
Times (hrs)
Flows (gals)
Day
Regens
Well Starts
[Code]...
To get it to look this way, I'm not exactly sure what to do from VB.
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Feb 23, 2010
I am trying to insert into a DB with has the following columns:
ID (autonumber), BonderIdentifier (text), Username (text), Login (date), Logout (date).
BonderIdentifier, Username, Login is the PK.
Here is what I do:
Public Function submitNewToDB(ByVal sessionData As BonderSession) As Boolean
Dim cn As OleDbConnection
Dim cmd As OleDbCommand
Dim str As String
[Code] .....
Like I said I get an insert into error and I dont know why. Nothing is in the DB yet and the table is created. I ran the built string in Access as such:
Insert into Session ([BonderIdentifier], [Username], [Login]) values ('Mork', 'sean', '2/23/2010 11:12:42 AM')
And it works.... but in VS it doesn't.
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Jan 25, 2011
Before any jumps in and says, Why dont you just use a gridview, i have my reasons not to use it.I trying to dynamically create a table and then populate the cells via a linq object.
Good news, i can dynamically create the table and the cells.
Dim numrows As Integer = MyActions.Count()
Dim numcells As Integer = 5
[code].....
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Jun 12, 2009
I'm trying to add a new table to a database connected via MS Jet driver. When I run the following Code, the error I get is:
Quote:In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user.I'm not sure what it is exactly hanging up on.
sql = "CREATE TABLE tblTable2 ([Text1] text(100) WITH Compression, " & _
"[Text2] text(25) WITH Compression, " & _
"[Int1] int(4) WITH Compression, " & _
[code]....
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May 4, 2011
I have a IF statement which is checking each row in the data table (for a match) and ELSE statement with commands which are executed if the If statement is not satisfied. Now I would like to write like so that it goes to the Else part BUT ONLY for values which are not satisfied in the IF statement. If I am more specific; I would like to calculate values if a match is found and just print them if it is not fond (usually there are both cases). Now the problem is the bold text; if there is a match found I don't want it processed BUT if the match is found I do. How can I write that?
currencyPosition = 0
Dim d As Integer = w + 100
For Each currency In Ary
[CODE]..........................
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Apr 7, 2011
i am trying to create a vb application which creates pdf documents by taking xmls as input.I want to get the table of contents for the pdf being created in the following format
heading1 ----------------page number
heading2---------------page number
heading3-----------------page number
using the chapters and section functions of itextsharp , all i can get is
heading1
heading2
heading3
getting the page numbers beside the appropriate entry..!??
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Jul 5, 2008
I'm looking for some simple code that lets me create a Microsoft Access table via code.Currently all I do in Access is write and retrieve data from specific tables but now I want to be able to create them at runtime. Here is an example of the code I use to load some data just so you can get a feel of what I'm currently doing. Hopefully there is an easy way using the same rough way that I'm currently dealing with databases.
Code:
Public Sub LoadCareer()
Public rs As New ADO
[code]....
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Apr 3, 2010
I am getting error "Exception from HRESULT: 0x800A03EC" near (******). can anyone please help me out. i have seen [URL] this blog also but there are also errors in that. can anyone please provide me the correct code for creating a pivot table. The code is,
Imports Microsoft.Office.Interop.Excel
Imports System.Runtime.InteropServices
Imports System.Data.OleDb
[Code].....
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Apr 3, 2010
I have been receiving the error "Exception from HRESULT: 0x800A03EC" near (***) in the code below,
Code:
Imports Microsoft.Office.Interop.Excel
Imports System.Runtime.InteropServices
[code].....
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