Database Object - Generating Datas In The Database
Jul 16, 2010
I am having problem with generating datas in the database. i have an SQl database called Customer with tthe following column (Customer_ID, First Name, last Name, Address, phone and email) I'm trying to filter the data, based on the Customer_ID Enterered in txtCustID.text? I used Parametized Query like this (Select Customer_ID, First Name, last Name, Address, phone ,email from Customer Where Customer_ID= ?) After Clicking Display Button on the form, The corresponding ( First Name, last Name, Address, phone ,email) of the customer is not displayed where i want it?
[Code]...
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Dec 22, 2009
How i can Insert Datas From DataGridView To DataBase.Datas Are in dataGrid. Don't Entry any data Manual.Excuse Me.My English Isn't Good.Iran Is Beautiful With All Languges Of The World.
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Jun 11, 2011
I'm doing INVENTORY project... i'm using ACCESS databse with vb.net... i'm having purchase, sales tables...
THIS IS MY PURCHASE TABLE:
CodePriceCategory TypeDat SPBrnd
11222cde bgf9/10/2025356asd
12255MEN Shirt5/10/2010355Vanhesun
55322bb bb9/10/2025456asd
66422bb bb9/10/2025556fdd
when i select CODE in SALES form, corresponding values have to shown in respective fields... I.e if i select 55, corresponding values have to be retrieved and showed in respective fields...
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Nov 15, 2011
I have a form and a button on that form.When the user clicks on the button an MS-Excel sheet is generated from MS-Sql Server 2005 and saved in a particular location.As this generation of excel tkes sometime to complete,what i want to do is i want to show a progressbar loading till the entire sheet is generated. Showing the progress bar will help the user to understand that the generating of excel is under process.
Below My code to Save the File
ExcelWorkSheetObject.SaveAs(ExcelSheetName)
Below My Progressbar Code
[Code]....
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Aug 14, 2010
with datagridview1
while looping through all the cells
i am trying to allot a cell value to another cell value basing on some conditions
& finally delete one column.my code is as fallows
Dim i, x As Integer
i = 0
x = Me.DataGridView1.Rows.Count[code]....
error i am getting is : Object reference not set to an instance of an object.it is extremely surprising for me the same code has worked nice for me but why & how the same line of code is generating this error.
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May 3, 2011
I was create Access database with Access 2003. I create VB project with Visual Studio 2005 Standard With connection wizzard I create coonect with this Access database, select all tablesI see this database inside Data sources and inside Server explorer Test connection is OK When I drag and drop table from Data sources, Wizzard don't create DataGridView, DataSourceBinding etc .. and I see popup window with mesage: Object reference not set to an instance of an object and then "game over"
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Jan 14, 2011
what is wrong with my code it is supposed to output all tables in my sql database but it is giving me an error saying object reff not set to instance of object
ListBox1.Items.Add(CType(GetTables().ToString, String
Public Shared Function GetTables() As String()
Dim kon As SqlConnection[code].....
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Jan 9, 2010
I want to create a new object of a class which is not predetermined before run-time. Something along the lines of:
[Code]...
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Oct 7, 2011
My Task Background :I have list of data items and have to calculate/aggregate details about each data item and populate that to SQLServer database.I can do 1 by 1 insert [Traditional method]But, the application needs to perform good.Is it possible to aggregate the data in a 2d array and dump into database @ once ?' Populate this and insert it to database.
Private data(100, 100) As Object
So, how to do that ?Also, is it possible to use dataset in some way ?
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Apr 28, 2009
im trying to load a database and I get this error.
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Feb 23, 2009
I have a problem in retrieving dateTime object from the database. I have this :
Return CBO.FillCollection(Of ObjectInfo)(CType(DataProvider.Instance().ExecuteReader("sp_SelectAll"), IDataReader))
Then When I want to display the date from the collection I get from the stored procedure. the date was truncated. It shows only the timein the ObjectInfo..there is a field call _mydate as DateTime.
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Oct 16, 2011
I am trying to insert a date object in visual basic into an sql database. And I am getting this error
SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.
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Oct 15, 2009
i have several classes / objects from it in a program that hold data like clsAddress with properties id, city, zipcode, name, and clsMyData that contain id, datafield1, datafield2, datafield3 and many more (just examples) I want to have methods in the objects to load the object from and save the object into a database, like me.loadFromDb and me.SaveToDb Of course i can do creating db tables like tAdress, tMyData, ... and in the methods do select / insert statements like "insert into adresses (city, zipcode, name) values(me.city, me.zipcode, me.name) etc. BUT - what i dont like is a) i need to build this loadfromDB / saveToDB Methods for every class separately and b) whenever i alter a class, i must alter the DB structure and the methods.
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Jan 24, 2010
I have an application which I am trying out on machines without mysql. The app runs fine on my local host however when I try to use the application on another machine I am getting the following error:
Access denied for user 'root'@'localhost (using password: YES)
Then I get a .net framework error
System.NullReferenceException: Object reference not set to an instance of an object.
I thought I had exported the DB but I was left with a mysql file which I placed in the bin directory.
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Jun 1, 2011
I am trying to convert some old VB6 code into VB.NET. The old code used DAO and now I am trying to replicate it in ADO.NET/OleDB. I have made some advances (I think...) but now I can't figure out how to add the DataTable object into the database.[code]So instead of the TableDef, I am taking the data from the same sheet and putting it in a DataTable object (dt). I hope this is correct so far. Now my question is how to replicate the m_db.TableDefs.Append td line from above.
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Oct 20, 2009
I have been trying for 2 weeks now to get this program to work.I am using VBasic and MS Access 2007 in conjuntion with a software application.the Database has 2 fields
1) Text
2) OLE Object (.jpg)
when I try to preview the data inside the DataSet I can only get the text to come threw, but that isn't the problem...the problem is binding the data to a datasource and displaying the information.I cannot get the database to display the information in FIELD 2
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Sep 9, 2011
So I create the model container:
Private mdbContext As PFModelContainer
Private mdbTransactions As Object
Before I did it this way:
Private mdbContext As New PFModelContainer
Private mdbTransactions As mdbContext.Transactions
Thinking maybe I was doing something wrong I changed it over to the first way, then I do:
Public Sub New()
mdbContext = New PFModelContainer
mdbTransactions = mdbContext.Transactions
End Sub
Once I hit mdbContext = New PFModelContainer it takes me over to the PFModel.Designer.vb Where it steps through the following:
Public Sub New()
MyBase.New("name=PFModelContainer", "PFModelContainer")
At which point it terminates execution of the code. This is the error it gives me on the Immediate window:
A first chance exception of type 'System.ArgumentException' occurred
in System.Data.Entity.dll
Is there something I can do to make this error go away? I tried deleting the project and recreating it with my old .edmx model that I downloaded from Mozy from when it used to work. It stopped working (as far as I can tell) after I changed the .edmx model and updated it. Maybe I did something else in the other project too, but I'm not recalling anything.This is what is in the app.config:
<connectionStrings>
<add name="PFModelContainer" connectionString="metadata=res://*/PFModel.csdl|res://*/PFModel.ssdl|res://*/PFModel.msl;provider=System.Data.SqlServerCe.3.5;provider connection string="Data Source=|DataDirectory|inDebugMyDatabase#1.sdf"" providerName="System.Data.EntityClient" />
</connectionStrings>
Should I be referencing System.Data.EntityClient and System.Data.SqlServerCe.3.5 somewhere?The EDMX property Entity Container Name is PFModelContainer and the Namespace is PFModel.
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Mar 30, 2011
There is an OLE object column that contains images in my access database. I'm trying to create a program that reads the images from that ole column and store the images to a file. Currently, I have a program that creates an image file but the image is blank.[code]
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May 12, 2010
I'm trying to import data from an exel sheet to a data grid but I keep on getting the following error "The Microsoft Jet database engine could not find the object"
Here is my code
Imports System
Imports System.Data
Imports System.Data.OleDb
[Code]....
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Oct 30, 2008
[code]...I am using above method to update the newly added value and modified values. It generates many duplicated rows in the database table.If my datatable object has been both newly added rows and modified rows, what is the best to update the database?
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May 27, 2010
I have an access database that I have imported into VB2008 through the data sources and have placed a table onto a form via drag and drop.Now whenever the form is displayed it crashes VS. I have tried deleting everything off the form, only leaving the database dataset, table binding source, table adapter and adapter manager on the form, even then it still crashes.I am running Windows 7 64bit, 2 of my peers are running Win 7 as well and are having this same issue, however the computers at our college are running Windows XP and have no problem at all with it.
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Jul 22, 2010
I have an XmlDocument object in memory which I need to update a database table with. My SQL Express 2005 DB table is three columns: Name, Telephone, Location. Below is the structure of the XMLDocument. What is the recommended technique to accomplish this?
HTML
<MyDirectory>
<Prompt>Records 1 to 561 of 561</Prompt>
<DirectoryEntry>
<Name>John Doe</Name>
<Telephone>22334222</Telephone>
[Code] .....
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Aug 11, 2009
I'm trying to develop an app to import a spreadsheet into an Access 97 database. I'm using Visual Studio 08. I'm stuck on the first step! I'm trying to use the Data Source Configuration Wizard to connect to the database, and when I get to the point where I choose which tables to add, I get the following error:
<COPYtblMHPuse>
Could not get column information for database object named 'COPYtblMHPuse' This is for any table I try to add.
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Nov 26, 2011
I'm trying to delete a record from an access database using the command object in vb.net 2010 express but can't seem to get anywhere.If I run the code below, I get no errors but nothing happens. The connection opens fine but the db does not update.the table has only two columns.The variable strCrit is so that I can build the sql string with exclamation marks, When I debug.print the sqlupdate string it seems to read fine.the routine is called from a form with a button.
Dim sqlupdate As String
Dim strcrit As String
strcrit = """"[code].......
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Feb 9, 2011
I have trying to create a database that uses object dependencies for five different related tables.
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Nov 3, 2011
I'm having problems with an Invalid Cast Exception when I try and read a PDF from a database as a BLOB. I am able to write the files into the database no problems at all,however, when I try to retrieve them I just get InvalidCastException.Here is the code I'm using:
Protected Sub btnPDF_Click(sender As Object, e As EventArgs) Handles btnPDF.Click
' Request.QueryString["docid"].ToString();
Dim docuid As String = "b39a443d-ccfd-47f4-b333-f12cd94683d6"
[code].....
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Sep 21, 2010
I have a need to populate a data object containing 30+ properties from a database table. I could create a simple class containing a public variable for each of the required properties, but I don't want to.
Is the following code a bad idea:
<Serializable()>
Public Class DtoEmployee
Public EmployeeId As String
[Code].....
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Apr 21, 2011
I have a function that returns a list of account numbers as an Arraylist. I am trying to use each account as a command parameter in another sub routine to get more data about each account number. This only returns the data for the last account number in the arraylist. I need to use each account number, call the database, get the additional information and store ALL of the data into a Gridview (databind). Example: If I had 3 account numbers in my arraylist return 3 rows of data to the gridview. I am struggling with how to get ALL of the information for each value (account number) in the Arraylist. Can someone point me in the right direction?? I think this can be done but I am not certain if my approach is correct or not. Perhaps I need to create datatables that contain the additional information for each value passed via the arraylist.
Private Function ReturnMultAccts(ByVal strAcct) As ArrayList
Dim acctsDetail As New ArrayList
Dim dsn As String = Configurati
[code].....
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Dec 17, 2009
I've now properly started implementing OO into my system (which I probably should have done from the start) but I just want to clear some best practices.So let's say I have a class called Job which contains information such as Description, Project Manager (Employee class), Value etc. at the moment, if I initialise the Job class it will initialise all the information held within it, even if I only want the job description. Is it best practice to do this or is it better to implement the class and access the database for values as and when they're needed? Or is it just better in those cases to just access the database directly?
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Oct 13, 2011
I'd like to have an updateable DataGridView that's bound to a database-driven business object. It needs to handle all aspects of CRUD and be sortable and filterable as well.
Most of them simply bind to an object (non-database, manually filled) and do not allow you to Add, Delete, and Edit records. Furthermore, they basically never show how you would perform sorting and filtering.
I think the biggest things I'm not understanding are:
1) How do you make the DataGridView perform additions, deletions, and edits on an object.
2) How do you program your object to handle additions, deletions, and edits. Do you just need methods that use ADO.Net, NHibernate, or Linq to SQL (or any other CRUD handling mechanism)?
3) How to make this filterable and sortable.
Is this overly difficult to do or why am I have so much trouble finding examples for this?
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