DB/Reporting :: Display Single Record From Linq Query?

Mar 24, 2011

For a school programming project we are supposed to create a database with 2 tables country, and continent.then we populate country with every country name, population and continentID. For continent we populate with each continent name.

i have completed this step, and i am able to run a linq query to display all countries and corresponding continent into a datagridview. My problem arises because we are supposed to display each record one at a time, and be able to cycle through one at a time. I cannot for the life of me figure out how to do this.

for example if i made a query to select all countries in africa, i want to beable to display the name of the country, and population in textboxes. then have a next button that will go to the next record.

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DB/Reporting :: Updating A Single Record?

Apr 21, 2010

I am using Visual Basic 2008 Express edition along with mysql manager 2008.I have made a bank database and am looking to add a feature to update the balances of customers (individually) when i withdrawl or add money.The code i am using currently is

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Me.Validate()
Me.StudentBindingSource.EndEdit()

[code]....

This is the same function as the Save record but, i want to be able to enter a value into a text box and then click the button to update the balance.

DB/Reporting :: Single Character With In A String Search In SQL Query?

Jan 14, 2011

I am trying to do a SQL query that checks for the presence or absence of a character's occurance in a field / column as a condition to retrieve the row. In this case I only need to test for existance of the specified character and in a similar query to test for the non existence. Not where it is or how many, just is it there or is it notI am using VB express.net 2008 and it uses, I think, MS SQL Server 2008.Using VB's instr() I can tell straight away if a string does or doesn't contain a character, but I would like to know this before I retrieve the row.

using the

WHERE .... and [mytable.myfield] LIKE 'Q'
or
WHERE .... and [mytable.myfield] NOT LIKE 'Q'

produces a result, but not a correct result. It does something but I can not say that it is working even part way.CHARINDEX gets an undefined function error MATCHES also gets an undefined function error?CONTAINS looks like it should work but I am still getting sytax errors with it, so I don't know how to use that predicate yet.

VS 2005 Perform A MySQL Query To Get A Single Record (searched For By ID?

Jul 8, 2009

I want to know if it is possible to perform a mySQL query to get a single record (searched for by ID) and then split each field into a seperate text box.I think im ok with the SQLQuery to get the record. its the splitting it into individual text boxes that im strugling with.

VS 2008 - LINQ Query - Groups And Counts On A Single Dgv Cell ?

Aug 11, 2010

I have a LINQ query that groups and counts on a single dgv cell. What I want to do is group and count on 2 dgv cells. So I modified my existing query by adding a SELECT statement highlighted :

CODE:

But I am getting an error on the second select variable stating: Range variable 'Value' is already declared

What I have read shows that I can select more than one variable.

What I am trying to achieve is this:

Original

CODE:

Result:

CODE:

DB/Reporting :: Getting A Value - Insert Query To Create A New Record In The Table

Nov 22, 2010

I am working with SQL Server express 2008 And visual Basic 2008. Here's what I'm trying to do, if it is possible.

I am using an Insert query to create a new record in the table. A sequential ID number is inserted into the database when the query is run in Visual Basic.

I want to capture this ID number in a variable and use it immediately following the execution of the query.

Is this possible or do I have to capture the value in a second query.

LINQ Queries - Combine The First 3 Queries Into A Single Query And Place In A List?

Jan 6, 2010

I am writing a message system on my server, the xml is something like this

<xml>
<entry>
<sender>[code]....

my problem now i guess is 2 fold, i wish to combine the first 3 queries into a single query and place in a list or a collection or is there a way to do this with a single query that will give me my desired result?

Query Access Database - Search Username And Display Student Record

Mar 7, 2012

I'm creating a rewards system for school where pupil earn points for good behavior which they can then use to purchase things like a packet of pens. (They can also have points deducted for bad behavior). I've created all the forms and now its just getting the data in from the Access database. This is what I need to do. On my form called detailsPupil it shows various information such as Name, email address, last login etc. This form is loaded once the pupil has logged in.

Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
Dim Login = Me.StudentTableAdapter1.UsernamePasswordString(txtUsername.Text, txtPassword.Text, cboPermissions.Text)
If Login Is Nothing Then
MsgBox("Incorrect Username or Password")
[Code] .....

That all works but I'm having problems working out how to get the information like Name and email address into their places. This is what I have so far on my detailsPupil form.
Public Class detailsPupil
Private Sub btnLogOut_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogOut.Click
Login.Show()
[Code] .....

So to sum up I need to run a query which searches the DB using the Username which is obtained from the login form and then displays the Student Name in txtName, Email address in txtEmail etc...

ASP.NET MVC - Linq Query With Count Returns Anonymous Type - How To Display In View

Sep 29, 2011

So I'm writing a query as follows:

Dim assSummary = From a In db.Assignments
Join ur In db.UserRegions
On a.Origin.ID Equals ur.Region.ID

[code]....

In the controller I can return the data easily as follows:

For Each c In assSummary
MsgBox(c.Description & " " & c.AssCount)
Next

If I pass the object through to the view using Viewdata("assSummary") = assSummary, how do I display the data? Every method I've tried results in messages about 'VB$AnonymousType_7(Of Integer,String) and I don't know how to retrieve the data from the anonymous type.

Retrieve The Record And Display The Record In A Listbox Displaying The Time Field As The Text For That Record?

Apr 18, 2009

I hav a web service which pull records from a database and I am hosting these services in IIS which works fine but I am trying to retrieve the record and display the record in a listbox displaying the time field as the text for that record.I have created the following function

public sub get_data()
dim dt as new data.dataTable
dim service as ws webservice.webservice

[code]...

LINQ Query Is Enumerated - Turn On Some Kind Of Flag That Alerts Me Each Time A LINQ Query Is Enumerated?

Sep 22, 2009

I know that LINQ queries are deferred and only executed when the query is enumerated, but I'm having trouble figuring out exactly when that happens.Certainly in a For Each loop, the query would be enumerated.What's the rule of thumb to follow? I don't want to accidentally enumerate over my query twice if it's a huge result.

For example, does System.Linq.Enumerable.First enumerate over the whole query? I ask for performance reasons. I want to pass a LINQ result set to an ASP.NET MVC view, and I also want to pass the First element separately. Enumerating over the results twice would be painful.It would be great to turn on some kind of flag that alerts me each time a LINQ query is enumerated. That way I could catch scenarios when I accidentally enumerate twice.

Access Database Query : Get The Old Record To Be Added To The New Record?

Apr 15, 2012

I have a access database with these columns. USER_ID,COUNT,TIMES

Let say the current record is this:
USER_ID,COUNT,TIMES
STEVE20,24,1.5

Now I want to updated the current count record and times, but before updating I want the old record to be added to the new record. What should be my query?

.net - ActiveRecord Linq/NHibernate Linq Not Building Query Completely?

Jul 14, 2011

given this function:

Public Function Search(ByVal StartIndex As Integer, _
ByVal MaxResults As Integer, _
ByVal AccountNumber As String, _
ByVal LastName As String, _

[Code]....

instead of what I expected:

Select count(*) from remitline where lastname = "smith"

What am I doing wrong building up the where clause? I'm using Castle ActiveRecord 2.1

Performance Gain In LINQ Query Vs LINQ Stored Procedure?

Aug 6, 2009

if there is that much of a performance gain in running a LINQ stored procedure versus a LINQ query?

Asp.net - Complex Linq Query - Add A .Where() Or .Any() Predicate To Reduce Query Complexity (in VB)?

Sep 14, 2010

I have to join two main tables, and I need to filter the results by elements in an ASP.NET web form. These filters are created on the fly so I have to use a lot of where extensions to filter the query. I want to execute the query with as optimized SQL as possible.

I am first doing a simple join between TW_Sites and TW_Investigators. Then there are two sub-tables that are involved. TW_InvestigatorToArea and TW_InvestigatorToDisease. While most of the where clauses are working fine, I have found a performance issue that won't be an issue right now, but will be an issue as the table gets bigger.

The arrays DiseaseCategories and DiseaseAreas would be the results of a CheckBoxList result.

Protected Sub LoadResults()
'Get Dictionary of Filters
Dim FilterDictionary As OrderedDictionary = Session.Item("InvestigatorFilterDictionary")
' Initialize LinqToSql

[code]....

Display Record From Table To Gridview On Page Load And Also Search Record For Particular Fields Using Textbox.

Jan 23, 2011

My database : table1

ID FIRSTNAME AGE
1 Sumit 22
2 Sanjeev 23

i have gridview 1 and textbox1 and button1 i want when pages load the gridview displays the all records from table1 and also ...i i wanna search record for firstname by typing sumit in textbox1 and click on button1 then in gridview the record of sumit will be shown ..by default gridview display alll records from table1 How to do this My Selct Query is below : but it doesnot display all record ...but it can display record if you search for a particular record .

[Code]...

Display A Record From Database And Also The Picture For That Record In A .rdlc Report?

May 23, 2010

I have records in a database. Each record has a Picture path in it eg. "C:\Pics\Image1.jpg". I would like to display a record from my database and also the picture for that record, in a .rdlc report in vb .net 2008. i have succeded in displaying the record but just can't get the picture to show. I am using an Imagebox in the report.

LINQ Query Using The Dynamic LINQ Library?

Mar 31, 2011

Forgive my ignorance on this.I have this LINQ Query:Dim ngBikersDataContext As New CarBikeWalkDataContext

bikersList = (From c In ngBikersDataContext.Reg_Bikers _
Order By c.L_Name _
Select New Bikers() With { _
.BikerID = c.BikerID, _
.F_Name = c.F_Name, _

[Code]...

with the error "Overload resolution failed because no accesible 'Select' accepts this number of arguments."
Over the "NEW" I get an error " ')'expected."

VS 2010 - Datagridview Record Display Particular Record

Apr 16, 2011

I'm maintaining a Datagridview on my Windows Form. When I open the form all the contained records are displaying, which is from SQLserver Table ok. when I open the form the datagridview should show just black and after I insert a new record that particular record should only display on that form gridview. [Code]

Using A Single Picture Box To Display A Single Picture Form A Bank Of Pictures?

Mar 22, 2011

I have a few problems i need to solve. Firstly, I am looking for a piece of code i can use to display a picture from a bank of pictures. It will work on the basis of generating a random number and loading a picture that corresponds to that number.

i.e. Dim RandNumber As Integer
Dim RandClass As New Random
RandNumber = RandClass.next(1, 10)
If RandNumber = 1 Then
Picturebox1.image = picture1

[Code]...

Secondly, can I then use subsequent picture boxes to display pictures from the same bank of images, without displaying the same image? Finally, I then need to be able to click the picture or a button beneath the picture to select it as an answer to a question and then the whole process starts again.

"System.ArgumentException: An Item With The Same Key Has Already Been Added." When Trying To Order An In-memory LINQ Query By A LINQ Association?

Jan 27, 2011

We are doing a query against an in-memory collection of LINQ data objects. The wrinkle is that we are ordering by a column in a related table whose records have not necessarily been loaded yet (deferred loading:)

Dim oPkgProducts = _
From b In oBillPkg.BillProducts _
Where b.Successful.GetValueOrDefault(Common.X_INDETERMINATE) = _

[code]....

LINQ To SQL - Add In Row_Number To A LINQ To SQL Query?

Aug 31, 2011

How do I add ROW_NUMBER to a LINQ query or Entity? How can I convert this solution to VB.NET?

[Code]...

I'm having trouble porting that last line. I have been unable to locate a VB.NET example. I'm actually not looking for any paging functionality like the example provides, just good old-fashioned Row_Number(Order By X) row index.

Delete A Single Record In A Datagrid?

Sep 23, 2009

I'm making a project which is gonna store data into a database..

how to delete a single record in a datagrid..

I have a column for deletion..

here is my code..

If dtgItem.Item(e.ColumnIndex, e.RowIndex).Value = "Delete" Then
Dim resp As VariantType
resp = MessageBox.Show("Are you sure you want to delete this Item?",

[Code].....

Print Single Record From Datagridview?

Aug 26, 2011

I'm using Visual Studio 2008 and SQL Server 2008 and Crystal Reports.

Windows form with datagridview and a printbutton.

Is it possible, if I select a record in the datagridview, to print that record when I click the printbutton?

Updating A Record - Single Column ?

Nov 14, 2009

I have problem trying to update a single column. I initially insert an null value,

Here is the insert code..

CODE:

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DB/Reporting :: Updating A Single Field In A Database

Mar 20, 2009

I'm using an access database in a program that I'm making for my school, the user is able to select an item from the menu, then it sends it to a list box, there is also a textbox to put a quantity of how much of the item you want. I have a field in my database called Amout Ordered, I want to update it with the amount of each item ordered, and I can't figure out how.

VS 2008 Linq Possible To Use Query In Another Query?

Apr 16, 2011

I was wandering is it possible to use a query within another query below is the code I am trying to use.

Public Function GetInventByComp(ByVal CompID As String) Using DC As New DataClassDataContext
'need to get company id's based off names? thats bad should be name from Id need to rethink this
Dim invent = (From C In DC.Inventors_Companies _
Where C.CompID = CompID _
Select C.InventorID).ToString

[Code]...

I was trying to us multiple values in a string like "1, 3, 5" but I can't seem to get that working either so I am trying to use just a single value now. Can anyone help me? "Yes I am new to this"

SQL Query - Execute A Sql Query That Will Display The Top 5 Based On Average?

May 17, 2012

I have a data table that looks like this:

USERNAME ICOUNT IAVERAGE DATE_LOGGED
LAGX01 1245 1245 05-07-2012
LAGX02 2211 1422 05-07-2012
LAGX03 1698 1112 05-07-2012
LAGX04 4598 1555 05-07-2012
LAGX05 2589 3245 05-07-2012
LAGX06 3321 1155 05-07-2012
LAGX07 3698 3458 05-07-2012
LAGX08 2589 4587 05-07-2012
LAGX09 1598 1142 05-07-2012
LAGX10 3156 1987 05-07-2012
LAGX11 5547 2011 05-07-2012
LAGX12 9456 3459 05-07-2012

Now, I want to execute a sql query that will display the top 5 based on average, so i did this:

SELECT DISTINCT USERNAME,IAVERAGE FROM myTable WHERE IAVERAGE > 0 AND DATE_LOGGED='05-07-2012' ORDER BY IAVERAGE LIMIT 0,5 and the result is:

USERNAME ICOUNT IAVERAGE DATE_LOGGED
LAGX03 1698 1112 05-07-2012
LAGX09 1598 1142 05-07-2012
LAGX06 3321 1155 05-07-2012
LAGX01 1245 1245 05-07-2012
LAGX02 2211 1422 05-07-2012

Now, I want to numberize my query result, so it will look like this:

RANK USERNAME ICOUNT IAVERAGE DATE_LOGGED

1 LAGX03 1698 1112 05-07-2012
2 LAGX09 1598 1142 05-07-2012
3 LAGX06 3321 1155 05-07-2012
4 LAGX01 1245 1245 05-07-2012
5 LAGX02 2211 1422 05-07-2012

Storing In A Single Variable In Linq?

Jan 24, 2011

how to store multiple variables in a single one to be stored in string?I have some 5 linq variables which am trying to store in a single string...Can you tell me how should i do so?

DB/Reporting :: Getting The Record Count?

Jun 14, 2008

I know how to display or manipulate (add,delete,update,search) records using the OleDbDataReader and OleDbCommand class. But I'm clueless in getting the total record on a query.

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