Basically i have a list(of TransRecord)
vb Public Class TransRecord
Public TableName As String
Public PKs As String
[CODE]...
And want to create a linq filter to select only unique records for TableName + PKs (group by) ... but want it to select only the record with the highest ID for this group by.
I have an warning for the Functions below on SaveDestFile and MakeFile. I am not sure why.
Warning1Function 'SaveDestFile' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
Module Functions
'Global Variables
Public MyStaff As String
Public MyFile As String
Public DestFile As String
[Code]...
I have two classes, one nested in the other. [code]Neither "Name" or "ID" are unique between operations and records.I wish to construct a dictionary using LINQ = Dictionary(Of String, Of List(Of Integer), whereby the keys are uniqe examples of Names in my collection and the values are the collective set of distinct IDs that are associated with those names.
View 2 RepliesI've got a table that caches calculated values for certain dates. I want to use LINQ to select all rows where the calculated value fields are null.But when I use isNothing I get an error that LINQ can't translate this into T-SQL. Is there a way to select null values with link, like this...?
Dim var = From rec As Record In myDataContext.Records Where IsNothing(rec.calculatedValue) Select rec
Other posts on stackoverflow mostly discuss how to avoid or check for null values with LINQ.
Note: I can't just set cacluatedValue's default to -1 to flag records whose calculated value has not been set (and then select those records) because I run queries that sum/average the calculated values. Selecting nulls seems cleaner and less bug-prone.
Am a bit confused on a basic select statement.Select Fieldname from Tablename Where FieldLink ='1007'
Nothing special.Now I pass into a sub that populates a combobox for me, but I get an error message - Index was outside the bounds of the array. This happens on the line when trying to add the data to the combobox But, if I change it to
Select * from Tablename where FieldLink = '1007' it will work fine, but returning the wrong field data.
Am I missing something. Procedure below that I using to populate the combobox
[Code]...
I`m looking for a way to parse a parameter name like linq does.I want to filter before i download the date from the database.With LINQ the data is already red into a dataset. I only want to select data from the database witch i need. how i can send a property name to a function without using the property name as string and without to use to mutch code inside the function and without creating an instance of the object, etc.
Module
Module1
Dim user
As user =
[code]....
I'd like to take all suggestion either in C# or VB.NET.I have a DB diagram like the image below. I also include the database script here [URL]In the Students table, CountryId and RoomId column are allowed null. Because some records do not have info about room and country yet.Also, some students do not have essays.I'm doing a joint query with all tables. I want to select all students to project the result like this:Wanted query result.
Here's my current query that gives the result like the image below:
Dim db As New DBDataContext
Dim query = From st In db.Students _
Join c In db.Countries On c.Id Equals st.Id _
Join r In db.Rooms On r.Id Equals st.RoomId _
[code].....
current query result I got only one result back because I have (2) William NoMan record in every table. But I don't get anything about others, like (3) Sync Master who has everything but RoomId.What do I need to modify the query above so it will give me all students like in the wanted query image above?
I am making a combobox dropdown to filter a report. I am using the table adapter to query the data and fill the report from the selected item in the combobox. However, if the user select index 0 (which is "-Select User-") , then the query should disable the filter and select all users in the database. How would I go about doing this with these 2 conditions?
View 1 Repliesi want to take a comma delimited text file and then select all unique records based on one of the fields in the text file. should i read the text file into a data table or just use a data reader?
View 7 RepliesI am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
View 2 RepliesI have a LINQ query:[code]How can I pass "MyField" to the Sub and make the LINQ "Where" clause work?
View 2 Repliesis there a way to filter out unique values in a dataview or an array? I currently filter a dataview as such: [code] So now I have a dataview filtering the table, but can I further filter this data to find the unique instances of an item in this table? I eventually have to pass a portion of this table to an array, so if there is a way to find unique values in an array, I can use that.
View 1 Repliesis there a way to filter out unique values in a dataview or an array? I currently filter a dataview as such:
TxtString = "Name = '" & TxtName & "'AND EmpID = '" & EmpID & "'"
dv.Table = dsTestTable.Tables("TestTable")
dv = New DataView(dsTestTable.Tables(0), TxtString, "", DataViewRowState.CurrentRows
So now I have a dataview filtering the table, but can I further filter this data to find the unique instances of an item in this table? I eventually have to pass a portion of this table to an array, so if there is a way to find unique values in an array, I can use that.
I am using XtraGrid in my application. Now, I want to display only Unique values for particular column when user will click filter button. I want to display this list check box items initially all checked. Also I want the information that what items user has selected/deselected from from checked list box.
View 1 RepliesI collect 1 text file lets call it google1.txt, i visit all of the google links inside to check on websites, lets say 20,000 of them.Then I re-collect (using the same keyword) a week later. It's saved as google2.txt.(it will contain many of the same links as google1.txt & i do not want to re-visit those links)How can I reference google2.txt to google1.txt & end up with google-new.txtWhich will only contain NEW links, that are not in Google1.txt
View 4 RepliesI have a DataTable with multiple columns including AccountNumber, Year, and Month. I am exporting the information in this table to an Excel workbook. Since this table has the potential to be extremely large, I must check the number of records in the table (since Excel can only have 65536 rows or something like that. If the original table is small enough, I need to put all of the records in a single worksheet. If there are too many records for one worksheet, I need to separate the records into multiple worksheets based on AccountNumber. Additionally, if there are too many records for a specific AccountNumber then I need to split that AccountNumber into multiple worksheets based on Year.ng:
Worksheet Name ---- Number of Records
1111 ---- 150,000
2222 ---- 50,000
[code].....
This is the hardest part of LinqtoSql database handling operations in visual basic 2008 I ever encountered,w/c is the update operation cause Ive been posting this thread several times from the other forum site but noone yet was able to answer my question,examples were given but its not efficient cause it won't specify based on the codes i gave and i know its not easy but im still hoping that one of the answerers of this forum will be able to resolve this particular linqtosql operation codes. I used textboxes in manipulating all data into the database such as displaying records, adding records, & updating records, basically I used with textboxes in doing those database operations. I will give you 3 block of codes w/c corresponds those database operations I used and differentiate from each other inorder for us to determine why one of them has no progress or won't do its operation w/c is the update operation...
*************Block of Codes#1(Adding Records)*************
Private Sub Button1_Click(------------------) Handles Button1.Click
Dim db As New memrecDataContext()
[code]....
I would like you to identify,differentiate, or troubleshoot the block of codes#3, or anyhow, why it has no progress at all or it won't edit and change the records but it runs and no error in regards with its code, and the other 2 blocks of codes were able to successfully do its operations.I was just wandering why only the block of codes#3 is not doing its operation successfully when you change the record being displayed in the textbox.Is there a possible way to edit records in the textboxes?If there is.... Is it possible to debug the block of codes#3 to successsfully do its operation? If you could possibly give an example,can you based it on the block of codes#3?
I have 2 List (of T) populated with the following
Dim curweekFolder As String
curweekFolder = String.Concat("c:", curweek_date.SelectedItem)
Dim preweekFolder As String
preweekFolder = String.Concat("c:", preweek_date.SelectedItem)
[code]....
I first wanted to identify which files matched in filename and list those in ListBox1, the following that was suggested on this forum worked very well (I added the minus last 19 characters as they would be different).
ListBox1.Items.AddRange(curlist.Where(Function(fi) prelist.Any(Function(fi2) fi.Name.Length - 19 = fi2.Name.Length - 19 AndAlso fi.LastWriteTime = fi2.LastWriteTime AndAlso fi.Length = fi2.Length)).ToArray)Now I need to populate ListBox2 with the files that do not match in each List (of T), again without looking at the last 19 characters. So for example if the first List (of T) had A.txt, B.txt and C.txt and the second List (of T) had A.txt and B.txt then ListBox1 would have A.txt and B.txt while ListBox2 would have C.txt.
Example-I have a person class
Public Class Person
Private _fname As String
Public Property Fname() As String
[Code]...
I have seen different examples in Linq and one used Select and another didnt but both return the same results. Is there a reason why we should use Select ?
[Code]...
I'm using the datagridview. This is the sample data:
[Code]....
How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?
[Code]....
i need to select some records from table Tr_cashbook between two date. the date field is newdt in which i need to compare data and the records should be shown in crystal report named rptCash2. the newdt field has datetime property. here is the code on the command button
bdcon.Open()
Dim QueryString As String
QueryString = "Select * from Tr_Cashbook where (Cast(newdt as date)>= " &
[Code]...
but this is not working when i press the command button it gives error as operand type clash: date is incompatible with int.
I've recently ported my website from 2005 to 2008, and I'm using LINQ Queries to implement a search. The issue is that none of the fields are mandatory, so I've had to implement a dynamic LINQ Query (sic?). Here's the relevant code -
Public Function searchQuery(ByVal titleType As String, ByVal titleName As String, _
ByVal configMgr As String, ByVal lifecycle As String, _
ByVal CIType As String, ByVal recordsPerPage As String) As IEnumerable(Of
[code].....
I am building an application that contains several DataGridViews that may have 100-20,000 rows displayed with a DataTable as its DataSource.When the user wants to filter a column they right-click the DataGridView Column Header and a ContextMenuStrip shows a small DataGridView that displays all the unique values in that column. I currently get all the unique values using a loop which is slow (shown below).[code]...
View 3 Repliesi have the following records, the FIELD(Timed) is formatted as datetime in sql
1/1/1900 12:00:00 PM
1/1/1900 12:02:00 PM
1/1/1900 12:05:00 PM
i used this query using my crystal report(XI).
crys_rep.selectionformula = "{vClient.Timed} >= #" & dFrom.text &"# and {vClient.Timed} >= #" & dTo.text &"#"
... other codes is point to my crystal report location and refreshed.
why there is no record found using my visual.net 2008
but when i try to sql query using the following code:
Select Timed from vClient where (Timed >= '12:00:00 PM') and (Timed <= '12:05:00 PM')
there is no problem..
I'm using Vb.Net 2008, SQL 7, Crystal Report XI
dp.SyntaxHighlighter.ClipboardSwf = '/dp.SyntaxHighlighter/Scripts/clipboard.swf'
dp.SyntaxHighlighter.HighlightAll('7c90d506846a47cda9bc951d960bafe6')
dp.SyntaxHighlighter.HighlightAll('1ce19e03a5a54baea62fef35fbb94f92')
I have two dimentional array, i want to filter the records in array is there any way to do it?
View 5 RepliesI am having so trouble with the ToUpper() procedure with strings. I am using LINQ to find unique values in a list of objects. In that whole process I set the values to compare to all lowercase in order to get a proper list. My goal is to populate a dropdown list with the values. I'm attempting to set the first letter of of the string to uppercase and keep the rest lowercase however the toUpper() procedure is not working?
Private Function FixCase(ByVal strIn) As String
Dim strOutput As String
Dim intStringLength As Integer = strIn.Length - 1
strOutput = strIn.Substring(0, 1)
[code].....
How do I search and filter records in the database?Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.
View 4 RepliesI have a listbox which is populated from a sql table. I need to select unique month values from the dates in this listbox.
Dates are, for example:
21/09/2010
22/09/2010
21/07/2010
09/06/2010
I need to extract september, june and july only from the above, sort them and display them in a another listbox.
I have this database and I need to load it with a visual basic form in Visual Studio 2005.The database has 6 tables and they contain wrong data that I must filter when loading the database in the form.
A quick example:First table is Category, which has 3 fields (id, name, description). In one record I have 2a for id (a numeric only field) and in other record I have m1lk for name (a string only field).
When I click a button I load the database into a DataGridView control. How do I stop visual basic from loading into the DataGridView control those records that have invalid data (like in my example).
I have try with SQL queries using WHERE and LIKE, like in
SELECT IdCategoría, NombreCategoría, Descripción
FROM Categorías
WHERE (NombreCategoría LIKE '[!l]%') AND (IdCategoría LIKE '[!abcdefghijklmnñopqrstuvwxyz]')
but it's really difficult to filter things like Angel* and P3ter and Hood8, all at the same time..