Get The Effect Of An Outer Join Against A Dataset?

May 12, 2010

I am new to ado.net and I am trying to learn capabilities as much as get this particular task done.Let me set the stage for my question.My goal is to load up a dataset, write out an XML, transfer the file to another machine, read the XML back into a data set, load up the local tables, find missing records from the local database and add them.These tables are for employees. There is the 'Employee' master, "Employee Job" the employee job code, and "Employee Hours", the employee time punches.I thought I could treat a dataset as a database and do SQL queries against it.For example to find missing Employee , my thought was to do a outer join on employeeID and look for null in the second table.Something like:

[Code]...

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C# - Linq To Objects Outer Join?

Mar 10, 2010

Im trying to use LINQ to query Objets. I'm doing the following:

Dim myList As Generic.List(Of MyItem) = (From ThisItem In LinqToSqlObject.Items _
Join Folder In LinqToSqlObject.Folders _
On Folder.Id Equals Item.Id _

[Code]....

This however will not return any item that has a ParentItemId of null. I am trying to do a left join so as to return all "Item" regardless of whether it has a parent or not. I am aware that this is feasible in C# by adding an "into X" on the join, and selecting from X.DefaultIfEmpty(), this however does not appear to work in VB.Net.

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Linq Left Outer Join?

Apr 21, 2011

I ultimately what I needed is generic function which would take two datatable and and 2 tablekeys and return Joined datatable. So here is my first step to solve it.

How Can I write Linq example of following T-SQL example in VB?

SELECT * FROM
Table1
LEFT OUTER JOIN
Table2
ON Table1.key = Table2.key

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LINQ To SQL Left Outer Join VB?

Nov 9, 2011

I cannot get this to work with LINQ to SQL vb.net?

SELECT a.FLD_ID, a.FLD_SUBJECT, a.FLD_GROUP, a.FLD_SUBMITTED, a.FLD_LASTACTION, a.FLD_CLOSED
FROM TBL_WSS_TT_TICKET a LEFT OUTER JOIN
TBL_WSS_TT_ALLOW b ON a.FLD_ID = b.FLD_TICKET_REF
WHERE (a.FLD_USER = 'user') OR (b.FLD_USER = 'user')

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.net - Subsonic3 LINQ Left Outer Join?

Mar 25, 2011

I am using Subsonic3 and would like to get a Left Outer Join between two tables. Here is the tested SQL

SELECT a.*
FROM vwVendor a
LEFT OUTER JOIN dbo.pubvenmap b
on a.vend_no = b.vend_no
where b.vend_no is null

[Code]...

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Linq Left Outer Join Null

Sep 27, 2010

I've got what I think is a working left outer join linq query but I'm having problems with the select because of null values in the right hand side of the join.[code]I want to return all of e and one column from c called tClassCode. I was wondering what the syntax would be. As you can see I'm using vb.net.[code]If i remove the c.tClassCode from the select the query runs without error. So i though perhaps i needed to do a select new but i don't think i was doing that correctly either.

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Asp.net - SQL Query Conversion To LINQ Left Outer Join?

Jul 4, 2009

I've looked all around and spent way to long trying to convert this SQL statement into a Linq statement in VB. I'm sure it would be a good example for others out there - the statement is trying to pull products that have a many-to-many relationship with product categories, and the categories have a hierarchy of parents/children.

Here is the query I am trying to convert:

SELECT P.ProductID, P.ProductName, P.ProductSlug, P.PartNumber
FROM Products AS P
INNER JOIN Products_Categories AS PC ON PC.ProductID = P.ProductID

[code]....

I can get up to the point where I am trying to say "WHERE ... (P_Cats.Parent = 9)" but can't figure that part out.

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Join Lists Or Arrays Like Outer Joining Tables In SQL?

Jun 27, 2011

Basically what I'm having to do is create a program that takes a list of CaseIDs and compares them to a table on a remote SQL server. However, the table holding the CaseIDs on the remote server has nearly 120,000 records.

Currently my plan is to query all records on the remote server, save the query and the current list to tables in an Access DB file and then run an outer join to see which CaseIDs have no matching records on the remote server.

I believe this will be a much slower process than I would like. If I could load both queries into arrays or lists in VB and then compare them (therefore, not having to write 120,000 records to a DB file), it would be much faster.

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.net - Linq-to-Entities: LEFT OUTER JOIN With WHERE Clause And Projection?

Oct 18, 2010

how to translate a simple SQL LEFT OUTER JOIN with a two condition where clause into a working Linq-to-Entities query. There are only two tables. I need values for all rows from Table1, regardless of matches in Table2, but the WHERE clause uses fields from Table2. In SQL, the two parameters would be Table2WhereColumn1 and Table2WhereColumn2, and the query (which works) looks like this:

SELECT t1.Table1Id,
t1.FieldDescription,
t2.FieldValue

[code].....

I've tried using Group Join with DefaultIfEmpty(), as well as an implicit join (without the actual Join keyword), and I only get rows for items that have values in Table2. I'm sure this won't help, but here's an example of the Linq I've been trying that doesn't work:

Public Shared Function GetProfilePreferencesForCedent(ByVal dc As EntityContext, _
ByVal where1 As Int32, _
ByVal where2 As Int32) _

[code].....

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Unable To Use A Linq-to-sql Statement And Getting A Left Outer Join To Work?

Apr 29, 2010

i'm having troubles with a linq-to-sql statement and getting a left outer join to work. here is a sample of two tables i'm trying to join and my code that i've wrote.

Table1 Table2
f1 f2 f3 f4 fID f1 f2 f3 f4
val1 val2 val3 val4 1 val1 val2 val3 val4

[code]....

Instead I'm returning ALL values from table 1. I need to return all values from the left outer join where tbl2.fID is null.

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LINQ Left Outer Join W/ Date Range Restriction On Right Table?

Feb 4, 2011

I have two tables, a LP_task table and an lp_Update table. I want a complete list of tasks and only updates that were posted during a specific date range. LINQ doesn't seem to support any other join criteria but 'equals'or each task. I want all tasks (left table) even if they don't have an update. (Left Outer Join)

Dim TasksData = (From t In db.LP_Tasks _
Group Join up In db.LP_Updates On t.ID Equals up.TaskID Into upds = Group _
From u In upds.DefaultIfEmpty _

[code]......

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DataTable Select Right Outer Join Query Triggers A "Failed To Enable Constraints" Error

Aug 9, 2011

I am using/creating a DataTable so the "enforceConstrains" property is not avilable for DataTable.Error message: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Windows Form Load Event:

Private Sub Expenses_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
expensesGV.DataSource = listExpenses()
expensesGV.Columns(0).Visible = False
End Sub

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LINQ Dataset LEFT JOIN?

Jun 14, 2012

i think i have not represented my question correctly here My LEFT OUTER JOIN MSDN reference is here to visualize my problem in access databaseTABLE "T1"1234567TABLE "T2"1,sunday2,monday i need output as 1,sunday2,monday34567 i need it to done through LINQso far i did is here

Dim RIGHT_table As DataTable = ds1.Tables("t1")
Dim LEFT_table As DataTable = ds2.Tables("T2")
Dim OutPut = From LEFTsource In LEFT_table.AsEnumerable(), RIGHTsource In RIGHT_table.AsEnumerable() _

[code]...

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Join Multiple Datatables Using LINQ To Dataset?

Feb 8, 2012

I have been searching for quite a while about joining multiple datatables via LINQ to dataset (When i say multiple, i don't mean just 2!!!), and it seems there aren't lot of examples in the net. I have seen examples of joining two datatables, done that, no problem there. Now i want to join three datatables. And there's nothing i can find out there.For example i have a 3 datatables:

PERSON (columns: person_id, name, gender_code, ethnic_code)
GENDER (columns: gender_code, gender_description)
ETHNICITY (cols: ethnic_code, ethnic_description)

[code].....

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VS 2008 LINQ Dataset LEFT JOIN?

Jun 13, 2012

i am having 2 tables one table stores the WEEK-days another table stores the WEEK-days + other fields.i need the LINQ query to return all WEEK-days + other fields just like SQL LEFT JOIN query so far i did is [code]....

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VS 2008 Linq To DataSet Left Join?

Feb 10, 2011

The query works but only retrieve the joined rows, i want to retrieve all rows in the first datatable.My current query:

vb.net
Dim q = From regE In (From registoE In _dtRegistosAEnviar.AsEnumerable
Group registoE By colaborador = registoE.Field(Of String)("Colaborador") Into grupoE = Group
Select New With {

[code]....

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Equivalent To JOIN Query With Dataset Multiple Tables?

Dec 21, 2011

How to Query multiple tables in a dataset to form single consolidated table without using any external database. I know this can be done using 'JOIN' in SQl.

Now my condition is I have multiple tables filled with data in a dataset and each table is interrelated with a common 'column'. For example ,

Table 1
ID
Name
1

[Code].....

Here I mentioned only two tables but in my case there are many tables. I need a generic answer for this dynamic query .

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Update DataBase For Dataset Filled By Join Query?

Feb 26, 2012

i have a dataset that filled by this query :

SELECT Invoices.ID, Invoices.invoicenu, Invoices.pdate, InvoiceList.icaption, Invoices.icaptioncode, Invoices.ccode, Invoices.postedbill, Invoices.billnumber, SUM(InvoicesDetaile.price)
AS Tprice
FROM InvoiceList INNER JOIN

[code]....

a datagridview is showing dataset data and user check checkedcolumn of datagridview (postedbill filed) and after user mark a few rows , i want update (invoice table) in database .

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Join Two Tables In Dataset And Show In Gridview Using Program 2008?

Jan 27, 2010

How to join two tables in dataset and show in gridview using vb.net 2008?

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Inner Join - Join Two Tables,'Employee' And 'Dispatch'

May 17, 2012

Iwant to join two tables,'Employee' and 'Dispatch'. Dispatch has column 'DispatcherID' and 'TechnicianID' which are both foregn keys to EmployeeID in Employee table.I want to join these two tables using EmployeeID so that i can obtain the matching name to each id.but it only works when i make a single join to either DispatcherID or TechnicianID and not for both.

[code]

select Employee.firstname+' '+Employee,secondname as Technician,Employee.firstname+' '+Employee.secondname as Dispatcher from Dispatch inner join Employee on Dispatch.TechnicianID=Employee.EmployeeID inner join Employee on

[CODE]...

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Open From Outer Txt File?

Mar 3, 2011

When i run the program and press Open, i want it to show a box with the list that i wrote in Hello.txt file. It is located in the right place i just cant figure out how i can open the file and show a checkbox if possible then by clicking on it it will highlight it and that will be the targe.

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.net - Inner Classes Building XML - Have Outer Class Put It Together?

Feb 25, 2011

I am trying to create a class whose end result is do create an XML document. Currently the class consists of nested classes that each build a section of the XML document. What I am hung up on is how I should tie the results of the inner classes for the final output.Should the outer class pass an instance of XmlTextWriter to each of the inner classes that build up specific sections or should each innerclass just output a string representation of the XML and the outer class can piece them together?

[code]...

The code is not complete but I hope it gives an idea of what I am trying to accomplish. I need to find a way to gather XML sections together to output as a single document.

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Move Controls To The Outer Edges Of A Maximized Form?

Jun 2, 2012

I have been working on a windows form over the last couple days and I have hit a brick wall when trying to move my controls.

I think I have basic understanding of anchoring and docking but I'm not getting the results I'm hoping for so I have attached some screen shots of what I'm trying to do.

It's not about re-sizing more about moving the controls to the outer edges when my form is maximized.

[URL]

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VS 2008 Snap Form To Outer Edge Of Another Form?

May 30, 2009

i want to snap one forms edge to another when within 10pixels of each-other.

I did try a little with LocationChanged event, but i couldn't get this to respind in the way i wanted.

Ideally i want to snap a second form to the rightmost edge of my first form.

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Changes Won't Take Effect?

Aug 22, 2011

Wrote a custom stand alone engineering program to do some very basic repetative design calculations. This program also does pricing by taking each design element and asigning pricing to it based on the parameters given. All the individual elements are added together to get a unit cost. (All this works well without any problems or issues)

[Code]...

My eventual goal once I can prove that my changes work is to control the pricing by using the YEAR so that the program increases the cost by a set multiplier based on the actual YEAR the system is set for. ie: 2011
10% increase, 2012 5% increase, 2013 5% increase, etc.

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VS 2005 Changes Does Not Take Effect?

Aug 15, 2009

I have fields with " monday, tuesday,wed, thu, fri, sat and sun". I am trying to add the hours of each day on a separte field " week total hours "..Everything works fine but say if i make any changes again to "monday hours" it does not take effect on " tot hours "

eg.. mon 2hrs, tues 1 hrs, wed 1 hrs, thur 0, fri o, sat 0 and sun 0, then the total hours is 2+1+1 = 4 and it displays well ....but if i change ( mon= 1 ) then it should be 1+1+1 = 3 but it remains 4

[Code]...

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Add Wait Form Effect?

Jun 30, 2010

I want to add a wait process form instead of the wait cursor effect while the method block execute codes.[code]...

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Create A Spinning Effect?

Feb 23, 2010

I have to create a slot machine. i have 3 picture boxes and i need to know how the program can randomly select from the 7 pictures i have but still create a short delay where there is the effect of spinning. my teacher said that it would be easy to assign each picture a number but i didnt get what he means.

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Effect Of Openform On Subforms?

Jun 12, 2009

When I use a control button on a switchboard to open my form which has subforms, the subforms open in datasheet view. When I open the form directly the subforms open in single form/continuous form view - which is what I want. Is there something I can do to the event procedure to make the subforms open properly?

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Forms :: Which Statement Has NO Effect

Nov 1, 2006

I was recently asked a multiple choice question: According to the sample code, which one of the following statements has NO effect and should be moved to another line to accomplish its purpose?

dim tb as New TextBox
g_row as Integer = 0
tb.Text = CType(g_row, String)

[code]....

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