How To Write A Scalar Query In .NET From A SQL Database
Jul 11, 2011
I am trying to write VB.NET query without writing SQL stored procs. I have already gotten many dataset text queries to work. But I am having trouble with getting this scalar query to work. All I want to do is to get the result of this T-SQL query. How can I code this successfully? select (DateDiff(w, '1/1/' + '2011', getdate())) / 7 AS SELECTED_WEEK (What this code does is it returns the current week of the year). And will this query above return the value as an integer datatype or string?
I tried your answers but it gave me this exception error:
System.InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is Closed.
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May 30, 2012
Can you show a coding example that has the "Using" statement with a scalar query?
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Apr 1, 2009
When I type in cntrows. I get all my table variables except the one I want which is TotalComments. How do I return the Count from my scalar query? I have a Table Adapter named :
[Code]...
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Dec 22, 2011
I have Customers table in a database. I'd like to create List of CustomerNames using entity framework 4.1. How can I do that in Visual Basic?
Dim customerNames = (From c In _context.Customers
Select New With {c.CustomerName}).ToList()
brings a list of anonymous objects.
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Oct 31, 2009
How can I write a sql query that takes information from a database, and then put in the text in a label?
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Jan 27, 2009
trying to write a dynamic sql query that fetches data from oracle 10g database. My Where criteria is giving me real problems but i guess it has to do with the oracle data format. The data column is a TIMESTAMP data type storing values like 25-JAN-09 07.06.01.000000000 AM. Am trying to get rows having the columns matching a specific date( ignoring the time values), my where looks like this
WHERE to_date(COMPLY_RUN_DASHBOARD_DATE,'DD-MON-RR')='" & Now.Date & "'"i get the following error :CheckError ORA-01830: date format picture ends before converting entire input string
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Apr 28, 2010
I am connecting to an Access database and using a parameter query with the LIKE operator to return all rows that match query. The string to search for is taken from a Textbox
sql =
"Select * FROM Allview WHERE Info Like" &
"*" &
CStr(TextBox1.Text) &
"*"
The query does not return any data in vb, but when run from access with same string, there is data returned.The connection to the database is done correctly, as I am able to return data with various other queries.
Partial code :
Dim
con As
New OleDb.OleDbConnection[code]....
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Aug 27, 2010
The database:
"ID (Primary key)" | "Title"
0 | "title1"
[code].....
OK, before adding values to database, we should check if a row exists with this values :)TO do this, creating a Stored Procedure is a best way to deal with the database fastly.So... The problem now is, at the runtime, Miss OleDB throw this error:Microsoft Jet database engine cannot find the input table or query 'IF
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May 29, 2009
i should say hi experts :D . Help me with this pretty code :)
The database:
"ID (Primary key)" | "Title"
0 | "title1"
[code].....
OK, before adding values to database, we should check if a row exists with this values :)TO do this, creating a Stored Procedure is a best way to deal with the database fastly.So... The problem now is, at the runtime, Miss OleDB throw this error:Microsoft Jet database engine cannot find the input table or query 'IF
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Mar 29, 2010
I have been assigned to write a asp.net website that allows a user to enter a title of a book in a textbox, or a ISBN of a book in a separate textbox. A database is then supposed to be queried to find the book and the book as well as its price, author etc.. are to be output on a new page. I am at a complete loss as to how to write a query, where do I even go in Visual Studio 2008 to write it? I have the database itself stored in the website resource file.
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Feb 3, 2010
I want to write a link query for my xml. Actually i dont know it.i have write some code here.
Dim query = _
From p In MyPermissionXml.Elements("menuNode").Descendants("menuNode") _
Where p.Attributes("title").ToString = "Company"
from where clause , i think it's wrong. how to represent an attribute here?
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Jun 25, 2010
Every time I edit the query in the query builder, it return this error "The schema returned by the new query differs from the base query". (eg. I remove "address" from the sql command - SELECT customer, address)I'm trying to select data from different tables from different database, How do I write the sql query? How do I join those database and tables together? (e.g Select FROM table1.database1, table2.database2, table3.database3 and so on)
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Oct 18, 2011
How can I write this SQL query in VB.NET LINQ?
[Code]....
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Feb 24, 2010
from a list, which got 3 attributesI want to return a new list of that class where attribut1 recurrence in the list equals Xfor an example this;
1,a,b
1,c,d
1,e,f
[code]....
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Mar 11, 2010
I have successfully run a simple sql query in vb.net and basically wanted to know how I can export the results from the query to a .txt file? All I really know is that I should be using StreamWriter. "SELECT column1, column2, from table1 where column1 = '1'" to a .txt file? Would it be best to first bind the data to a grid or can I skip that step?
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Sep 3, 2009
I am using vb express and MsAccess as database. I am trying to write a query for the calculation of Stock.
My tables are as under:
PId PDate ItemId Description Price Quantity Amount
1 28/8/2009 1 Coca Cola Normal 1,00 10 10,00
2 28/8/2009 2 Coca Cola Zero 1,00 5 5,00
[code]....
But i could not get the desired results.
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Apr 29, 2012
im trying to write a query using multi 'where' conditions however am having so difficulty making it suitable for vb, sql = "SELECT * FROM Room WHERE [Room Size]= '" & Noofppl.Text & "'" AND [Number of PC's] = '" & noofpcs.Text&"'"
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Nov 24, 2009
I have a for xml raw select query that returns a xml string in server2005 and i would like to write that string to a file using vb.net.
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Sep 14, 2010
Im just trying to figure out how to write an LDAP query to list all of the PCs in a specific OU.
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May 26, 2009
I have 2 tables:tblcode and tbltransaction tblCode with 2 fields:Code and Description with data like
Code Description
A test1
B test2
C test3
and tbltransaction with 4 fields:transactionID,UniqueID,Code,Value with data liketransactionID and UniqueID are the primary keys)
transactionID UniqueID Code Value
120 1 A 0
120 1 B 1
I want to write a query that outputs:
transactionID UniqueID test1 test2 test3
120 1 0 1 0
so because tblcode has 3 fields I have 3 columns which are test1, test2 and test3(the descriptions of Code A,B and C) i tried to use pivots but it didn't work for me since I don't know in advance the number of rows in tblcode?
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Feb 25, 2009
How to write Case Sensitive Function In SQL Query?
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Mar 25, 2010
Whenever I try to modify "any" Dataset using the designer in a specfic projet, I get the error mentioned in the title. The designer works OK in other projects.Steps:
1. Open the the dataset.xsd from the solution explorer.
2. Right click in thedesigner and add Tableadapter.
3. Click the Next button twice to get to the "Enter SQL Statement" and click "Query Builder" button.
First Error Message: "The Query Builder Faied..." "The Parameter is Incorrect" Click OK and click the "Query Builder" button again...2nd Error Message: "The Query Builder Failed..." "Attempted To Read Or Write Protected Memory.This is often an indication that other memory is corrupt."
This one particular dataset has been editied a number of times. Furthermore, in this project, I now get this error in all three (3) datasets I have in the project. Is there a way to start a new prject, import the form andf class objects and create an entirely new set of datasets? I've tried this with no success.
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Apr 8, 2010
i need to make a database application that can write/retrieve cells/datasets from/to a database i buyed a book in there was an example of how to create a database application while debugging i had the "Object reference not set to an instance of an object." error and it highlighted this code
objDataRow = objDataSet.Tables("KlantenTable").NewRow
now the problem is here i declare something later in the code i write to it
objDataSet.Tables("KlantenDataTable").Rows.Add(objDataRow)
[Code]....
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Mar 21, 2012
I have users check off lab facilities in a UI. I want to use linq to fetch corresponding records for all of the labs that they have checked off. Basically,
Dim myRecs = (From l As EpiData In myDataContext.EPIDatas Where l.facility= _
one of the checked labs
So basically, I need to write a linq query where the "strings" to match are determined at runtime. Is there any way to do this easily? I know that there is a library out there called dynamic LINQ, but (1) it's in C# and I'm writing in VB (2) I'm really just looking for a single, simple solution for this single case.
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Oct 21, 2011
I have been debugging my code for a while and looking at posts in other forums, but it seems to be that everyone has a different problem than mine and what works for them will not work for me.My dropdown list is supposed to filter a gridview by choosing all the Companies that are associated to a certain product. The solution I have found online is that most people did not have DataKeyNames set in their gridview. I do have this set, but not to CompanyID. It wouldn't make any sense. So I have no idea what I am supposed to do since this is the only answer I have found.
<asp:DropDownList ID="ddlCompany" runat="server" DataSourceID="dsCompanyFilter"
DataTextField="CompanyName" DataValueField="CompanyID" AppendDataBoundItems="true"
AutoPostBack="true">
[code]....
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Apr 20, 2011
I have one scalar value function defined in sql database.It accespts 2 parameters and return an integer.Can anyone please help how to call UDF from vb.net using oledeb?
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Jan 9, 2012
Must Declare Scalar Variable @ID?
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May 16, 2012
This seems so basic but I've been struggling to find a solution! I have a web page that take user data from aspx textboxes. Upon hitting a button, the click event submits the responses to a SQL table. Seems easy.I'm using VS10, dev express and VB code. I have established my datacontext class using LinqToSql...In a nutshell, the code is as follows...within the click eventNote that "database" was earlier defined as my datacontext sql connection, "Request" tablee
Dim vname As String = AspxTextbox1.Text
database.executecommand("INSERT INTO [Requests] (ContactName) Values (@vname)")
[code].....
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Apr 6, 2010
im having this prob, when deleting a line from my gridview, this error shows out.Must declare the scalar variable "@productid".Well, i dont know whats wrong with the coding. As i have already declared the productid.
<table style="width:100%;">
<tr>
<td class="style24" colspan="2">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
[code]....
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Jun 10, 2010
I've done some research and I'm not sure what to look for or what my problem is.My error is: "Must declare the scalar variable '@client_id'"
[Code]...
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