Save Table A Last ID Into Table B Simultaneously Using Linq To SQL
Apr 10, 2012I have 2 Tables Table "A" and Table "B". Here is little details.
Table "A"
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ItemID (Primery Key)
ItemSKU
[Code]....
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C# - LINQ To SQL Join Two Tables To Select Parent Table Twice Based On Two Different Columns From Child Table?
Aug 23, 2010I have two tables Employees and CafeLogs. Some employees can be cashiers and also customers at the Cafe shop.
Table structures:
Employees: EmployeeId(PK) , FirstName, LastName
CafeLogs: LogId (PK), CashierId, EmployeeId, Value, => CashierId and EmployeeId are the data from column EmployeeId of Empoyee table
Table relationship:
Employees 1:N CafeLogs (CashierId (FK))
[code]....
Right now I know how to select only LogId, Employee's name, and , Value, not with Cashier name yet.
Dim query = From log In db.CafeLogs _
Join emp In db.Employees On emp.EmployeeId Equals log.EmployeeId _
Select log.LogId, emp.FirsName, emp.LastName, log.Value
Filter Parent / Child Table In Linq Query Based On Entities In Child Table?
Jul 9, 2010I have a table (Projects) which is linked to projectVersions on projectID..projectVersions contains several columns on which I'd like to filter a returned project (and associated projectVersions) list. For example there is a "capacity" column and a "country" column. I am doing a filtered list of projects on one page and I'd like to include all projects where any one of the associated projectVersions has a capacity of 750ml and a country of "France" for example.It may be that a particular parameter is not set and so I pass a zero to indicate not to filter on that.I guess this needs some kind of subquery as when I try and do something like this: [code] it doesn't work as the "xxx" bit, being one-to-many, expects me to specify an item to get at the entities within and yet I want to query where ANY of the associated versions match one of the criteria.
View 1 RepliesAdd New Table In An Access Database And Copy All Content From An Existing Table To New Table
Aug 30, 2009I want to add a new table in my accdb and copy the content tfrom an existing table into the new one.
Is there an easy way to do this?
Refresh Table Adapter When I Have A Child Table Attached With Parent Table?
Dec 21, 2011I have a data table whose one column is related to a column of another table. I have a listbox in a form which shows a column (which is sorted by another column value by ORDER clause) of the parent table and other columns are in textboxes. The child table is represented by a datagrid. When I add a new item in parent table and click save, the newly created item is listed at the bottom of the listbox violating my ORDER clause. When I wrote some codes to fill data again after updating, it shows an error message[code]...
View 3 RepliesCopy A Table To Another Table Without Overwriting The Contents Of The Second Table?
Feb 23, 2010How do I copy a table to another table without overwriting the contents of the second table?
View 2 RepliesLinq To SQL / Query From Table
May 18, 2012I am starting with Linq to SQL in VB.NET, and trying to figure out how to make a simple query to a database.I want to do it all programaticly.I have made a connection to the database with a connectionstring, and this works fine - I can get a message if the database exists or not.But when I want to query a table, I am missing the part where I connest to the table. I have googled a lot to find an answer for thi, but [code]
View 2 RepliesTable Not Getting Updated While Using LinQ?
Dec 14, 2009I am trying to update a table using LinQ. Though records are getting inserted, for some reason they are not getting updated.what can be possible problem
Dim db as new empDataContext
Dim emptable as new employee
if update then[code].....
Using LINQ - Query Out Dbf Table?
Sep 2, 2009I was able to use it for querying out info from an XML file but now i have to use the DBF file from a folder. where i can find out how to query out DBF table using LINQ. I basically need to get data from a column of a DBF table.
View 2 RepliesC# - LINQ To SQL Count Table With Relationship
Jun 17, 2011C# or VB.NET is fine. I'd like to count number of people for each country from the following tables with LINQ to SQL I have two tables, one is Countries and other is People. It's one to many relatoionship from Countries to People. ountries table column:CountryId,CountryName People:PeopleId,FullName,CountryId (a primary key from Country table and allowed null) I want to count how many people each country has and get something like the following result that shows only the country that has people. Because there are some countries that have no people in the People table.
[Code]...
Linq-to-sql Speed When Getting Table Count?
Mar 31, 2012Dim mydata = (From c In dc.Table Select New With {c.ID}).Count
any faster than this:
Dim mydata = (From c In dc.Table Select c).Count
[code].....
Populate A LINQ Table In Code?
Mar 2, 2011I want to populate a LINQ table from code, not DataBase.Is it possible ?System.Data.Linq.Table<Question> myquestions = new System.Data.Linq.Table<Question>();
View 2 RepliesSql - Linq Union For Extra Row Not From Table
Jun 20, 2012I need to return the same results from linq as I get using SQL
SELECT DISTINCT Area, Region
FROM dbo.Regions
Union
SELECT null,'All'
Order by 1,2
I use this for showing an "All" selecting in a combo box
My current linq points to a view that does the union for me but I want to know how to do it right in linq. I can't figure out how to union a row for the null,'All' values.
Public Shared Function GetRegions(ByVal Area As String) As IEnumerable
Dim DB As New SiteDBDataContext
Return From values In DB.uv_Areas _
[Code].....
.net - Update 2 Table Values In One Query In LINQ?
Apr 26, 2010I have 2 tables Table1 with columns [BId,Name,Amount] Table2 with columns [CId,BId, ExpenseType,Expense]. BId Is the foreign key in Table2. The Amount field in Table1 is always higher than Expense in Table2. I need to update the values of Amount (increase or decrease) based on value of Expense and I want to do it in single query in LINQ. Eg If the Expense has to be updated with 200, I would decrease(negate) Amount value with 200. If Expense is reduce to 100 then the Amount is increased by a value of 100.
View 1 Replies.net - Update Students Table Record Using LINQ To SQL?
Aug 22, 2011I´m trying to update my Students table record using LINQ to SQL. The problem is when one of the Properties of the object changed and 'PropertyChanging' Event is fired using 'SendPropertyChanging()' method.
student_id is a PK
data types are matched
Here is the full ArgumentException:
GenericArguments[2], 'System.String', on
'System.Data.Linq.Mapping.PropertyAccessor+Accessor`3[T,V,V2]'
violates the constraint of type 'V2'.
[code]....
Add Custom Columns To A Table That LINQ To SQL Can Translate To SQL
Aug 26, 2009I have a table that contains procedure codes among other data (let's call it "MyData"). I have another table that contains valid procedure codes, their descriptions, and the dates on which those codes are valid. Every time I want to report on MyData and include the procedure description, I have to do a lookup similar to this:
From m in dc.MyDatas _
Join p in dc.Procedures On m.proc_code Equals p.proc_code _
Where p.start_date <= m.event_date _
[Code]....
Is there a way to turn a complex lookup (i.e. a non-trivial join) like this into something SQL can recognize so that I can define it in one place and just reference the description as if it were a field in MyData? So far the only thing I can think of is to create a SQL view on MyData that does the linking and bring that into my data context, but I'd like to try to avoid that.
C# - Split String To Hash Table Using LINQ
Jan 23, 2012I have:
string s = "A=1,B=2,C=3";
I need the output in hashtable using LINQ. Hashtable should be filled as
["A"] | 1
["B"] | 2
["C"] | 3
Copy LINQ Results To Data Set / Table
Jun 24, 2011I'm working on a form that has a few data grid views that are populated from LINQ queries, no problem there it works as it should however that sorting does not work. After doing some reading its because LINQ results do not support sorting.As I have the LINQ results already is there a way of copying the results into a dataset or datatable then binding the data grid view to that so sorting will work?
View 4 RepliesLinq Related Table Not Queryable Error?
Aug 17, 2010I've got a problem with Linq in VB.NET.I've created a .dbml file from my db, and everything looks good - relation "arrows" between tables are visible, etc.But when I want to use simple query (taken from 101 Linq Samples by MS):
Dim q = From h In dc.Hours, w In h.WorkType
I receive an error:
[code].....
Using LINQ To SQL With Views Need To Cast / Convert To Table
Jun 25, 2012My SQL Server database contains several views which are essentially filtered (WHERE) / ordered (ORDER BY) versions of some of the tables i.e. no joins.
An example would be my Downloads table, which has a view such as DownloadsOnlineOnly e.g.
SELECT * FROM Downloads WHERE Live = 1 ORDER BY FolderName ASC;
I can drag and drop these views onto my LINQ to SQL DataContext, and use LINQ to query these views and retrieve data fine...
But the foreign key relationships are not being picked up in my DataContext, so I've lost the ability to:
Dim dl as DownloadOnlineOnly = (From r in db.DownloadOnlineOnlies Select r).First
Dim fol as Folder = dl.Folder ' Syntax error as there is no association between
' DownloadOnlineOnly and Folder in my DataContext.
I understand why this is happening, but how can I get around this:
Without manually adding associations in my DataContext? Can I change the type of the Entity like changing the return type of an SP on the DataContext? Can I cast or convert between a DownloadOnlineOnly object and Download object? Or some other method?
LINQ Query 2 Arrays Simultaneously?
May 12, 2011how can i query 2 arrays simultaneously?for example:
dim string1() as string = {"a","b","c"}
dim string2() as string = {"d","e","f"}
dim string3() as string = ? 'linq query that selects all elements in string1 + all elements in string2
Asp.net - Create A LINQ Statement Where The Table Name (FROM) And Column Name Is Variable?
May 11, 2012In my programming task I've gone down a dark alley and wished I hadn't, but there is no turning back now.
I'm building up a SQL statement where the table name, column name and id value are retrieved from query string parameters i.e. ("SELECT [{0}] FROM [{1}] WHERE [Id] = {2};", c, t, id)
But it isn't as bad as it looks, I'm protected: Only authenticated users (i.e. signed in users) can execute the Page_Load I'm checking that both the table and the column exists beforehand (using GetSchema etc.)I'm checking that the Id is an integer beforehand All my tables have Id columns The database connection is reasonably secure
[Code]...
Asp.net - Select Query In LINQ Based On Foreign Table
Mar 2, 2011I have 2 Tables , OrderDetails and Requests In my LINQ to SQL dbml file. OrderDetailsID is a foreign key in Requests Table.
I want to write the query to get the sum of UnitCost from OrderDetails based on OrderId. And If there is a row in Requests Table for each OrderDetailsID, and the Requests.Last.RequestType="Refund" I want to reduce the total refund amount from the main sum otherwise If there is no row based on OrderDetailsID, add to sum.
Here is the way I implement that. I am looking to prevent using "For each".
iRefund = (From od1 In dc.OrderDetails _
Where od1.OrderID =1 _
Select od1.UnitCost).Sum
[Code]....
Dynamically Select Table At Runtime With Dynamic LINQ?
Feb 17, 2011I'm developing an application to allow engineers to conduct simple single table/view queries against our databases by selecting Database, Table, Fields.
I get how to use the Dynamic LINQ Library Sample to provide for dynamically selecting the Select, Where and Order by Clauses at runtime but I'm at an impass on how to allot for table choice.
Is there a way to provide for dynamically selecting the "from" table at run time
EDIT
So Both of the answers seem to be saying the same general Idea. I'm going to try to convert the C# into VB and get it to work.
The first answer converts to
NotInheritable Class DataContextExtensions
Private Sub New()
End Sub
[Code].....
Multi - Table Join Query In ASP.NET To SQL Server Via LINQ?
Jan 29, 2012I'm working on an ASP.NET 4.0 site, which I inherited ownership of. It has a number of existing LINQ datasources pointing to individual tables. For example, to the Patient Encounter Summary table in SQL Server. The problem is in displaying the data there. It's a normalized database, so that table contains (for example) the provider ID, rather than the provider name.
It's simple enough to join the Patient Counter Summary to the Providers table (in SQL)... but how does one do that in ASP.NET? I'm not sure of the correct nomenclature, but the 'mid layer' is VB.
[Code]...
Select Query In LINQ Based On Foreign Table?
Mar 4, 2009I have 2 Tables , OrderDetails and Requests In my LINQ to SQL dbml file.OrderDetailsID is a foreign key in Requests Table.I want to write the query to get the sum of UnitCost from OrderDetails based on OrderId.And If there is a row in Requests Table for each rderDetailsID, and the Requests.Last.RequestType="Refund" I want to reduce the total refund amount from the main sum otherwise If there is no row based on OrderDetailsID, add to sum
View 3 RepliesSave Img To Table?
Dec 13, 2010i have a parameter error
check this statement
Dim conn As New OleDbConnection
Dim cmd As OleDbCommand
[code].....
Save Jpg Into A SQL Table?
May 10, 2010There are about 1000 jpg files need to save into SQL server as image type. I created two fields in the table tImage: one is [Filename] which will take jpg file name and another field is [NewImage] which will store jpg as image. How to code to loop all jpg files and save into SQL table? (jpg is located at d:jpgfiles)
View 1 RepliesGetting The Data From 3 Table In Linq And Produce The CSV File And Send The Mail
Jan 19, 2011I am using window programming in visual studio(2008) and i am using LINQ and need to get the data from three table's column e.g A table's 1st column(x),b table's 2nd column(y) and c's table third column(z), and then i have to produce the excel sheet(CSV file).I want to get the table's data in string format in visual studio and then produce the excel sheet.I don't want to use Store procedure and grid view in my program.
View 5 RepliesLINQ To SQL: Reference The Data Context When Extending A Table Object?
Jul 27, 2009If I'm extending OnCreated for a LINQ to SQL table object, is it possible to get a reference to the data context to which the table belongs? For example, if I add a property to the data context:
Partial Class MyDataContext
Private _myValue As String
Public ReadOnly Property MyValue As String
[Code].....
I don't want the property on the data context to be Shared, because it could be different per instance. I've been pouring over the designer code to figure out where the reference might be, but no luck yet.