Database Is A .sdf File Created In Web Matrix?
Jul 31, 2011
I am writing a small aspx web application that takes in forum information after validation and then opens a database connection and populates the proper columns with data.note: The database is a .sdf file created in web matrix My issue is that even with: Import Namespace="System.Data.OleDb" on the page I am getting:
Type 'OledbConnetion' is not defined. I am extremly new to VB, I am coming from java and honestly I do not have all year to read vb code and take classes and read books. I need to finish this app for a client so I am kind of rushed.
[Code]...
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Jul 24, 2009
I have built a matrix style controlboard ( many pictureboxes used as buttons) To call on a simple database. Being a beginner, I have not yet found any code for doing a query of sunh simple nature as this database. The Northwind samples are far more complex than what i have, but this is my main program, the reason I got into VB in the first place. 2 pictureboxes say PB1 & PB2. PB @ ontop of PB1. PB2 is invisible, but blocks view of PB1. Clickon 2, & it Hides(). Click on 1, & 2 Shows(). a simple math control box counts the events & turns the group inputs into binary output... 4textboxes per group is the way I chose Ther are roughly 200 pairs of these sporadically placed, this is just 1 pair. Textbox 16, & 18=0 @ form load 17 fixed ="1" 15 sets of these, TextBox42= binary value. This is the one that triggers the events for column "C" in the database. ( Their not in perfect order)
Anyway, this is where I need to get information tfrom the database to the listbox, heres that situation: Database has simply named columns A,B,C,D,E,F, G, H, ect.. Then the rows are equally simplistic row, rowB, rowC,..Any combination is represented here, Each row has several, but not all of the columns values. Since if only 2, or 3 of the variables clicked can = several different groups, a multiple reurn to the listbox is nessessary. I seen some code in an exercise that I think will do that, but how do I query the database to start the listbox load? The lesson shows a completely different situation for loading the listbox, but I think I can amend that easily enough. I just can't ask the simple question to the database.
Question is, if picturebox related to column "C" is clicked, how do I call the group names ( rows ) of those positive in Column "C" to the listbox? The Database is litterally that simple. Just 1 situation of columns & rows, not mutiple as in the lessons. If anything, I fear I'm too much a simpleton. I have added the PB's code
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Mar 11, 2010
I am trying to read the matrix (see this link [URL]
This matrix will be in text based file. How can I read this file and create a matrix and fill it in my code. The other question I have is that the matrix has first row and column with value as char and rest values are in integer, how can I take care of this?
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Apr 8, 2009
My work is, I have a DEM file and header file of it.Now, I want to display the elevation value from the DEM file of the given Longitude and Latitude.And, I worked on it before,Where I could get the elevation value with the resolution matrix of 6000x4800 and I can able to read the elevation value.But, now I want to modify in such a way that I should read the elevation values from the DEM file with the resolution matrix of 11x11.So, kindly guide me in getting the elevation value with resolution of 11x11 matrix.The code I have used before to display the elevation value with resolution of 6000x4800 are:
[Code]...
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Apr 2, 2009
I need to display or get the elevation value of a given latitude and longitude from the DEM file in 11x11 matrix array.Actually I have a DEM file and corresponding HDR file of it.And, the DEM file is 6000x4800 Matrix with 57600000 data's.Now, I worked with some codes where I can able to get the elevation of a Given latitude and longitude.But, When I Zoom IN or OUT,the Latitude and Longitude values changes so,when I pass the changed latitude and Longitude value,I could not able to get the elevation value.The reason is,
In the 6000x4800 matrix the Resolution of the X and Y is large,so when we Zoom IN or OUT the resolution changes and could not display the elevation value.But, where as if we get the elevation values in 11x11 matrix array,since it has 121 data's only, the resolution value will be small and even when we Zoom IN or OUT and pass the changed Latitude and Longitude, we could able to get the elevation.[code]....
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Apr 13, 2012
how to build it and how to manipulate it?can i use the data of an access file table as a matrix directly?
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May 18, 2010
When I am developing an application and I use the 'Data Source' tab to create a database, will that database be automatically created when I use the software on another machine?
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May 29, 2009
I have created an access database which i want to search with vb.net, I tried a few thing but it didnt work as desired.
Firstly the program is suppose to display items in the database base on the criteria selected by the user. what i've succefssfully done so far is I've added a datagrid 2 combobox, 1 (searchcbo) with the columns in the database and the other (searchcbo1) will autoload the items under the column selected in and a button (searchbtn) but i have no clue of the code to put in the button. i also tried the fill method but that didnt work as i wanted to. ultimately i want a combobox with the list of columns and a textbox to enter criteria and of course a search button.
The searchbtn should act as the "WHERE" sql command, e.g. SELECT EmployeeNumber, Firstname, LastName, Phone, Location....etc FROM CallLog WHERE searchcbo.text = searchcbo1.text And display the results in the datagrid.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'CallLogDataSet.CallLog' table. You can move, or remove it, as needed.
Me.CallLogTableAdapter.Fill(Me.CallLogDataSet.CallLog)
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Attached image(s)
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Jan 22, 2011
[Code] my issue is that now i need two cases, first i need a query that will return the date created and modified of the table and i also need to know if its possible to query a list of table names in the database ordered by date created but that have a certain thing in their names. for example the database contains the following tables: [Code] and what i need the query to return is the tables that contain "Data", settings and employees are for the other functions of the program. so the query should return the 4 data tables in order of date created. but i have no idea how to go about doing that in the query, does anyone know how this is done?
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May 9, 2012
I want to check if database is created or not whne using the below SQL command
CREATE DATABASE IF NOT EXISTS 'DatabaseName'
from the below link i could able to get if database exists or not. and i tried the same way to catch the result od SQL command. but i could not. correct me if i wrong. below is my code. Having a form with 2 text boxes (txt_host,txt_db) and a button Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]...
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Jun 5, 2011
I'v created a program with a Ms SQL database, registration form and login form. Everything was working well so i detached the database and added it to my program as an existing item before so as to deploy the program. But now i recieve an error when i try to login to the database. The error states that there is a failure connecting to the database and the database cannot be opened
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May 20, 2012
Close a database that we created by programming?I have created a database with below codes[code]...
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Sep 16, 2010
I created a Query in a database in Access. I want to attach it to a DataGridView in VB2010. I then went to VB and connected to a Database. Then I dragged a DataGridView onto the form. Up came a pop-up menu. I Clicked on Choose Datasource, Add a DataSource,clicked on all the next buttons, selected Tables and Views checkboxes and clicked finish.In the next view up pops a menu that lists my Database and it's tables, but not the created Query. The Query does exist in the Database and I am accessing the correct version.
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Jan 19, 2009
I created some database already in my SQL server 2008. And im planning to show all this data via graph using VB.net..Is there anyone here can give me LINK, thread or the best is tutorial so that I can begin doing it.Usually my data is based on date only. So once the date inputted then it will SQL and get the exaxt data in Graph format.
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Apr 4, 2009
i have mad e a database with the following tables...username varchar(50)password varchar(50)as you know it does the rest for you"now i have a form with..TextBox1 for username textbox2 for password
my database is called "jonno-laptopsqlexpress.username.dbo" now if i add usernames and passwords in to the correct tables how can i login via he textboxs?
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Mar 11, 2011
I'm going through All-In-One Code Framework Coding Standards document and one of the recommendations is to add a file header comment at the start of every human-created code file. This is the first time I've seen such a recommendation and to me it's just an unnecessary and ugly clutter but I'm wondering if someone could explain why M$ recommends this?
[Code]...
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May 24, 2010
Please how can i publish an application created in vb.net along with a database which i created in SQL Management Studio?
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Jun 21, 2010
how can i link form created using vb.net to sql server database.I created a database with sql server 2000 now i want to connect form created in vb.net to sql server database
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Apr 28, 2011
I created a small program which one uses the SQLite database. I have a simple table employees, composed of the name and password. I can not write sql script correctly. application code is:
Imports System.Data
Imports System.Data.SQLite
Public Class Form1
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
[Code]...
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Aug 12, 2009
I am an experienced programmer but am new to VB. To start, I am trying to create a simple database program. (My ultimate goal is writing a comprehensive database program in 6-8 months)I have created the database and bound the fields to a form.
But what I want to be able to do is add a field to the database and then also bind that new field to a textbox on the form.The new field appears on the list in the Server Explorer window (on my left) but not in the data sources window (on my right.) The data sources windows has a "refresh" option but that does not help.When I manually add a textbox and try going to DataBindings in the property window the new database field is not listed.
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Dec 30, 2010
I am in the middle of the creation of an application using vb.net. I have a database created in MS.Access which includes 7 tables. I connected this one with my parent program code. Now the problem is that I want to display the data from each column. I have 12 columns and 14 rows in my first table. How can I display data from one column in a Combo box?
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Jul 2, 2009
I have a connection to an access database, I have used the data sources tool provided because in this particular instance I don't want to do much with it other than display the records (which I can do) and edit them (which I'm haveing some trouble with).I have created a system whereby the database is connected to using the preset tools available like; BindingSource, TableAdapter, BindingNavigator etc.
I also have a button for edit. This doesn't work and I was wondering if anyone could help me with this? I can't really provide any code for this, because I didn't code the connection by hand and the code I have been attempting to use for editting the records in the database doesn't even sort of work.
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Oct 19, 2010
I have created an application in which I have to make a report with ReportViewver from Microsoft.Everything ok until now. I have created the report and for this report I have created a dataset. This dataset contains data for every month in every year from 2010 to 2015. With this dataset I am populating a graphic but my problem is that I want to select the year and create graphic for one year.I do not know how to insert a parameter in the dataset. In sql is very easy by in Access is different and if I try to put something like ...' where year_column=@year_parameter' I receive an error.
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Jan 31, 2010
With the following example of code, whenever the user clicks a menu item it will load up a new form. This form will then read from a database, and create text boxes throughout.
Private Sub allowances_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If mainMenu.currentSlic.ToString = "0" Then
[Code]....
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Apr 13, 2011
I do not know much of datasets. I have created a local database with a table as per img 1 attached, and I use them in a simple drop down selector as per img 2. But I get the message as per img 3 , and I played around with the dataset, removing teh primarkey, etc.
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Aug 9, 2011
I'm using MySQL 5.5 database. I have created a database which only have one table where it stores all sorts of keywords according to categories.
The users key in sentences in the textbox and then I'm suppose to classify the sentences into the category based on the keywords in the database.
How do I loop through the database to compare the strings in the textbox to the keywords in the db?
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Apr 5, 2010
i have a database created in access showing in multi text-boxes in visual basic 2008 express edition. the database is showing music information and sales (tune name, artist, sales, and year issued) there are a few processes i want to do but can not work out the coding.1. display the top ten selling tunes in a particular year in order ( the year needs to be selected from a list box and displayed in a list box)
2.display the total sales in a particular year ( year selected from a list box)3. display the tune with the greatest sales in a particular year ( year selected from a list box)
[Code]...
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Mar 3, 2012
I have a dbf file. I saved it as a csv file and can open it in excel.
But i cannot open it in VB.net using programming and OLEDB connection.
If i copy all these content, paste it in a new excel sheet and then save it as csv file. My VB.net program reads it absolutely fine.
Any idea what might be wrong in saving the file directly from dbf to csv using excel?
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Aug 7, 2009
Over the last couple months I've created a fairly substantial program for a friend in vb 2008 express to deal with the management of a fantasy football league, for its data storage it uses mainly an sql server 2008 express database for all the data, however there are a couple of text files for some unrelated fixed values.
I have spent the last week or so putting some vague finishing touches on it so that I can give it to said friend to test for me. However after working perfectly fine for me for the duration of the construction and also working fine on a couple of computers I installed and tested it on, upon giving it to my friend I find that (after installing) as soon as he opens up any form which relies on database data it spits out an error akin to the following:
Exception Text:
System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
[CODE]...
Loaded Assemblies:
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4918 (NetFXspW7.050727-4900)
CodeBase: file:/Q:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
[CODE]...
I have used a combination of LINQ and SQL statements to query and and update the database, with LINQ for querying and SQL for the updating, due to this most of the database communication is done through a LINQ to SQL datacontext using the pre-generated connection string in my app.config file: <add name="FFL.My.MySettings.FFLv2ConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\FFLv2.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" />
The only other time a connection string for the database is used is in an SQL execution function which uses the following: Dim connectionString As String = "Data Source=.\SQLEXPRESS;AttachDbFilename='" + Application.StartupPath + "\FFLv2.mdf';Integrated Security=True;User Instance=True"
The textfiles are also referred to using the 'Application.StartupPath + "folders/filename"' method
As for other details; I started this program on vb 2008 express but upon finding that the express version didn't have much in the manner of deployment facilities, downloaded a 90 day trial of visual studio 2008 pro to deploy the program as an msi install file. Operating system wise, I started the project on XP before converting over to Vista home premium + latest service pack (I think) which is what I've finished it on and am using currently, the 2 computers I successfully installed it on were both running XP SP3 and my friend runs a dualboot of Windows 7 and Vista (not sure what edition), he's tried it on both to no avail.
And for reference; to the above code/error, the database is called FFLv2.mdf and the project FFL.
The pre-requisites for my program (as highlighted by vb) are as follows:
.Net Framework 3.5 SP1
Windows installer 4.5
SQL Server 2008 express edition
I've tried changing the connection strings to specify a specific filepath, but that didn't help.
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May 10, 2010
The above is more or less the complete question. I have created a table in the VB 2010 Database Explorer but I cannot for the life of me work out how I can get this copied or created into the underlying server. It is not appearing in the underyling serverand when I run the code of course I ge "invalid object <tablename>" I have data as well in the table that appears in Database Explorer. I think I have missed something fundamental in my overall conception of using VB 2010 Express with SQL Server Express in that I don't know if I have a local copy (that isn't then mirrored on the server), or what (the ____ have I got)? An article that explains the overall relation of Database Explorer to the underyling Server would be great as well
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