Sql Server - Read Data From A Database Using LINQ To SQL In VB Using An IQueryable?
Dec 2, 2011
I know how to select items from an array with LINQ, but what I can't figure out how to do is access a database using an IQueryable. I connected the database to my project, added two classes from the database to the "LINQ to SQL" .dbml file and saved it. In my programming assignment, I am not supposed to create a data source (table thing) to display the data, but update my own interface manually. In order to do it, I was told to instantiate this:
Private dogs As System.Linq.IQueryable(Of Dog)
(Dog is a class that I added to my .dbml file from the database file)Also, I am told it involves using a method
.AsEnumerable.ElementAt(index As Integer)
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Oct 21, 2009
How can I convert an object of type System.Data.Linq.DataQuery to System.Linq.IQueryable?I'm working with Visual Basic/Silverlight, and the source code of my query is as follows:
Public Function Get_Cli_Pag() As IQueryable(Of V_Cliente_Pagare)
Dim Qry = From P In Me.Context.Pagares Join C In Me.Context.Codigos On C.Codigo
[code]....
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Dec 6, 2011
I'm trying to get datetime value but here is issue with nullable datetype.
Public Function GetDate(ByVal kodg As Integer) As DateTime
Dim g = From dt In db.xDates _
Join f In db.xGrafiks On dt.КодД Equals f.DateKod _
[Code]....
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Aug 11, 2011
I am new to EF Linq and I have been struggling with this query for a few days. From reading this forum, I have managed to get this far:
Dim noPic = (From f In myEntities.FriendLists
Where (f.UserID = Profile.ID)
Select f.FriendID).Except(From g In myEntities.GuestLists
Where g.EventID = _id
Select g.FriendID)
[Code]...
I am trying to get everybody from the FriendList who is not already on the GuestList to display in a Repeater control. After reading the forum I was able to append .First() to noPic at the myNoPic declaration and finally get a result but that only gave me the first element. Does anybody have any advice on how to accomplish this?
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Oct 1, 2010
The LINQ VB code below is to read the first record data for database table
ProductTable that has 3 colounms (or 3 fields):
TableCol1, TableCol2, TableCol3. The reading data is stored at variable
MyArrayFirstRow.
'-------start LINQ VB code in Visual Studio Web Developer 2008-------'
Dim MyArrayFirstRow
[Code].....
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Jul 7, 2009
I have a programmer who is using VB and LINQ; and I have a MySQL database that is running on a linux server. My programmer tells me that:he cannot connect to the MySQL database via LINQ if he was able to connect then it would require all sorts of rewriting I don't know anything about LINQ but I thought it was an ORM. As such, any DB server that is supported should work just fine? Right? OK, so maybe it's not an ORM... maybe it should generically connect to ODBC and render similar results?
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May 4, 2009
I have an SQL database set up on my web server. Is it possible to read from a table in that database and display a value in a textbox, for example? I want to store valid values in a server database and then check the entered values in the application against the server values.
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Apr 9, 2010
I have three tables in SQL server which I would like to show and access on a form. Table 1 contains account data, address, contact details etc. Table two contains data attached to a Person, tel no , Mobile no, Email etc. Table three contains details on what awards the person holds, i.e. one person can hold several awards.
Therefore I have a one many relationship between the first two tables and a one many relationship between the second two tables. This is set up in SQL
The first two tables are shown on a form, table 1 via a set of text boxes, table 2 via a datagrid control.
I would like the functionality whereby I could select a row in the datagrid showing the persons name and find the Persons_ID number then use that as a filter to a second datagrid view so that only the selected persons awards show in the datagrid.
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Jun 18, 2011
I want to read pdf file in the database sql server
but i want to read from my application or open adobe reader
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Jul 27, 2010
I hate to ask this question on this forum, but I'm having a lot of trouble finding it on these online tutorials. Basically, I'm learning about SQL, VB.NET, and how to glue the two together, and I've learned about using SqlCommand.executeScalar() to get the first entry in a table. But that's all it's really good for, right? Or is there something more to the story here?
Basically, I'm wanting to ask about how to pull in a FULL table from a SQL database while using VB.NET, as well as how to pry substrings and stuff from it. Again I'm having to ask this on this forum because all these online tutorials seem to ignore the subject completely.
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May 23, 2009
I'm trying to get a single field back from the data. (I am searching by a primary key so I should get 0 or 1 answer). Please help. The table that I am querying has one entry with user = someone, input to several columns with the ans column having "a good answer"
Code:
Dim reader As SqlDataReader
Dim par As SqlParameter
Dim result As String
[Code]...
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Feb 28, 2010
i have a app in visual basic mobile 2008, so i finish but now i need to tranfer the data generate in the in the app mobile to data base in sql server 2008.
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Jan 4, 2012
I'm trying to create a VBasic executable to read a SQL server database and produce a mailing list.I have the SQL routine working fine and had set it up as a stored procedure, but I've just discovered the manager I've written this for is an Access-type and does not have SQL Server installed on her machine. So, I figured I'd make a front end in VBasic.
Dim con As New SqlClient.SqlConnection
con.ConnectionString = "Data Source=mySQLServer;User ID=Username;Password=myPass;"
con.Open()
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Aug 31, 2010
I was just wondering if it's possible to create an app that interacts with a database hosted on a web server... or is it only possible using VB.NET? Also if it is possible, is there any good documentation or tutorials I could reference?
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Jul 17, 2011
Trying to use asp.net for the first time. I want to read a single value from a sql server database.
I have configured the SqldataSource as:
CODE:
I have the above asp:SqlDataSource code on the website page. The connection string is in the web.config file. When I run the page it is all works but the required data is not shown. Am I right to think that where I dragged the sqldatasource entity is where the data result should be shown?
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Jul 30, 2009
how i read data from Sql server and write that in .csv file with vb.net , after that saving the .csv file with my own name and path? what must i do? for information data in sql like this one:
[Code]....
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Dec 26, 2008
how to work with XML.I need to create an multilingual application and need to save the controls captions in sql table with xml data typei started the following:[code]I know this is not very professional but thats all i did until know in SQLNow i have a problem in VB.NET i don't know how to read an xml data type (How to get the value from variables).If somebody can give me an exmaple how to read the xml than i would continue translating for each objects in the form where name is like the variable "btnLogin" and give it the controls.text property to the variables value.
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Sep 9, 2009
I need to solve the following problem:- Create a server application which generates a random number every second- Have any number of client applications access the current random number through a dll (associated to the server) at anytime How would I do this? Anyone has a prototype VB.Net code for the server which does this kind of thing? I'm pretty sure I know how to write the client code.
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May 19, 2010
Basicly I want to create a server that can read data sent by multiply clients and give feedback to them I have found some tutorials before but its only oneway trafic (Client>>>>Server) and the server crashes as soon as the client is disconnected
ps. If its a tutorial with VB it will be nice other visual codes are also good
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May 18, 2009
I am trying to read JSON data from a server to a dataset object, any idea on how this can be done. I have tried using the DataContractJsonSerializer class but it only seems to work for objects.
JSON Data
{
"firstName": "John",
"lastName": "Smith",
[code]....
The code above works to an object, but I want to parse the JSON data to a dataset object.
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Feb 24, 2010
I'm only getting started with VB.Net, using VB Express 2008.Using the System.Data.SQLite wrapper, I need to read data off a SQLite database file, and chart data using basic bars, pies, lines, etc. Nothing fancy.
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Aug 10, 2011
I am trying to create a console application that does the following:
1) read a text file
2) Save the content over to a SQL Server database
3) Use command line arguments to allow user to specify any delimited file
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Mar 18, 2011
I have to write a code in vb.net (2010).To get a data from Database A table 1 and dump it to Database B Table 2.What's the best way to do this? Most efficient way? I know I can do this very easily in sql management studio but I need to write a code to do this in vb.net.
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Nov 15, 2011
I am trying to write a windows application in vb.net to import data from excel to sql server. I got "object not set to an instance of an object" error. The data actually have been inserted into the sql. The following is my code. I have a button when the button is clicked, it does frmProcess(). The first row is header in excel. I start to read data from 2nd row.
----------------------------------
Private Sub frmProcess()
Dim app As New Application()
Dim book As Workbook
[code]....
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Jul 1, 2012
I have data that was stored in a sql 2008 table in image format. I want read the data from sql with VB.net 2005 and put it into a character array or a byte array where I can access the data within the code. I can not use file stream to read the data because I have no ability to read files from a directory.
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Jan 21, 2012
so i just bought a years web hosting with godaddy, and apparently i have one ms SQL 2008 database, is this compatible with VB ? and if so how can i link them together? i need the user to be able to update the database but also read data from it.
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Dec 16, 2010
I have problem with my application I have a table with 3 columns: column1(numeric(18,0), allow null), column2(nvarchar(255), allow null), column3(datetime, allow null). I want to read data from a .csv file and insert it into database. I use 'bulk' to insert data from file .csv into database instead of inserting query. But the problem is: the .csv file have to be formatted as:
[Code]....
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Feb 24, 2009
I like to update data from an access database every 100ms. This works fine, but it does not look good on the screen. It refresh the whole screen on my laptop and it is not looking good. Is it a good way of updating data without getting this disturbanses in the screen?
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Jan 14, 2011
[code]...
This codes are working but how can I validate the username if it is already in the database?[code]...
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Apr 28, 2009
I'm developing an application that will take the data from a cd. This cd stores a .csv file. Can VB read this data from the disc and upload it to a database? Im not sure exactly where to start looking. Can someone point me in the right direction, as to what compnents i should be looking at.
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