C# - Linq Query Summing Dates In Range?
Feb 9, 2011
Trying to work out if there's a nice way of doing this, preferably in Linq rather than loops, which is what I've done for now.
I want the number of days my Product is active between two dates.
Product has many ProductHistories, ProductHistory has values for DateActive and DateInactive. DateInactive can be null, and often will be, to show that this history is ongoing. Histories won't overlap.
I want to sum the maximum of my startDate or the ProductHistory's DateActive, and subtract that total from the sum of the minimum of endDate or ProductHistory's DateInactive (endDate by default if DateInactive has no value).
Worked example:
Get active number of active days between 2011-01-01 (1st Jan) and 2011-02-01 (1st Feb)
Histories:
Active 2010-12-25 : Inactive 2011-01-05
Active 2011-01-15 : Inactive 2011-01-20
Active 2011-01-25 : Inactive null
[Code]....
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Oct 2, 2009
I'm using two datetimepicker controls to set the start and end dates for a range of dates I'm searching for.I want to make sure that the start date selected is not greater than the end date. This code works, but it runs the messagebox prompt twice for some reason. I've tried to ignore it from doing this, but it's not working. Can someone tell me what's wrong?
Private Sub dtpStart_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dtpStart.ValueChanged
[Code]...
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Feb 15, 2009
How can I determine if a varable called "date1" is within the range of variables "date2" and "date3"?
For example, if date1 is 12/31/1999, and dates 2 and 3 are 12/31/2001 and 12/31/1997 (or the other way around), then first date is between the 2nd and 3rd dates.[code]...
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Mar 19, 2012
how can I determine if a varable called "date1" is within the range of variables "date2" and "date3"?For example, if date1 is 12/31/1999, and dates 2 and 3 are 12/31/2001 and 12/31/1997 (or the other way around), then first date is between the 2nd and 3rd dates.
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Sep 17, 2009
I am trying to get my calendar to render with all the dates in my database, using ranges. Only problem is, I got it working fine, but it has shifted everything one day to the future.
Protected Sub CalDayRender(ByVal sender As Object, ByVal e As DayRenderEventArgs) Handles Calendar1.DayRender
Dim strConn As String = ConfigurationManager.ConnectionStrings("SiteDataConnString").ConnectionString
Dim strQuery As String = "SELECT [EDATESTART], [EDATEEND], [ENAME] FROM [EVENTS_FORM] WHERE [EACTIVE] = 'Yes'" '"SELECT * FROM [even
[code]....
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Jul 28, 2009
[code]...
this is for a single date..but i have list of date ....and i want to check how many days fall from march 20 to apr 10 between jan 4 to apr5..
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Jun 8, 2011
im doing an employee attendance monitoring system, and i need to have a search feature which shows an employee attendance record in a given range of dates
example[code...]
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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.
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Sep 1, 2009
I need to figure out whether a certain date falls within a range of dates. For example the date 11/07/97 (MM/DD/YYYY) falls within the following range of dates formatted as shown below:
01-Apr and 31-May
01-Jun and 31-Oct
01-Nov and 31-Mar
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Jul 28, 2009
Dim myDate1 As DateTime = datetimepicker1.value
Dim myDate2 As DateTime = datetimepicker2.value
Dim myDateToCheck As DateTime = datetimepicker3.value
[Code]....
this is for a single date..but i have list of date ....and i want to check how many days fall from march 20 to apr 10 between jan 4 to apr5..
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Mar 25, 2010
I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
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Jun 5, 2011
am using sql 2005 and vb 2008.i need to compare dates and select matching records betweem a selected date range.say records between 11/13/2010 and 11/20/2010.e.thing is working ok except when it comes to selecting dates between 11/1/2010 and 11/9/2010.this is happening because when am retrieving the dates from database,its being retrieved in the format 11/01/2010 instead of 11/1/2010 and so it reports no records found,and knowing the limits of sql 2005 this is the only way i can retrieve the date. [code]
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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
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Aug 6, 2009
if there is that much of a performance gain in running a LINQ stored procedure versus a LINQ query?
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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]....
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Jul 31, 2010
I have made a simple program in VB.Net.In this program I made two DataTimePicker with the names of
1. DtpFrom
2. DtpTo
I want to get the dates from tblStudents between the dates given in the dtpFrom and dtpTo.The Date Format for these two DateTimePicker and in tblStudents is "M/d/yyyy".When I run this query.
"Select AdDate from tblStudents where AdDate >= '" & Format(dtpFrom.value,"M/d/yyyy") & "' and AdDate <= '" & dtpTo & it gives me some times correct results but some times it missed some of the dates. I want to get the precised dates, without missing any date. So is there any Mechanism to solve this Problem.
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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."
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Sep 16, 2011
I have a database application connected to a sql express datafile, i am using a datagridview and have clicked on the arrow and added a query. the query is simply sort / ascending on my date field which is a text field with auto generated when the field is focused so i know the dates are entered correctly but when i use the query they are not in their correct order. [Code]
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Jun 11, 2011
When I'm trying to run this program Sql QUERY doesn't work properly , but the month and day are okay but it comes to year it doesn't work...
Dim strSql As String = "SELECT * FROM tblAudit WHERE Date_Time BETWEEN '" & Format(dtpFROM_F.Value, "MM/dd/yyyy") & "' AND '" & Format(dtpTO_F.Value, "MM/dd/yyyy") & "'"
classLibrary = New ConLib
classLibrary.openConnection(strConnection)
lblconstat.Text = DatabaseStatus
If Not classLibrary.isconnectionopen() Then
Exit Sub
End If
classLibrary.initializeCommand(strSql)
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Oct 26, 2010
I am building an application where a button click runs a sql query and shows a user the next available date that they can process from. The problem was that it needed to be the following Sunday and not the following day.
That code looked like this:
Public Class Form1
Dim ReturnValue As Object = Nothing
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]....
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Oct 27, 2010
I am building an application where a button click runs a sql query and shows a user the next available date that they can process from. The problem was that it needed to be the following Sunday and not the following day.That code looked like this:
Public Class Form1
Dim ReturnValue As Object = Nothing
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connectionString As String
[code]....
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Dec 1, 2011
I am trying to get a list of dates from a provided StartDate and EndDate in my database, and use these dates to link to dates in a database (to display another variable on the y-axis of the chart) and to populate the x-axis of a chart (with the list of dates). Is it possible to get a list of dates in VB and pass them into a chart this way?
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Oct 21, 2008
I am building an application where a button click runs a sql query and shows a user the next available date that they can process from. The problem was that it needed to be the following Sunday and not the following day. That code looked like this:
Code:
Public Class Form1
Dim ReturnValue As Object = Nothing
[code]....
Code:"select payrolldate from payroll where(payrolldate <= getdate())and payrollran <> 'yes'")but when I add that query it just returns a value of 1/1/000 as the date.
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Jun 11, 2011
I have an installment payment program which have Hijri date (Saudi Arabia) and I already have the code for it's converter inside the forms (using datetimepicker for the Gregorian & maskedtextbox for the Hijri). I'd like to know how can I convert or produce the corresponding equivalent Hijri dates of a series of Gregorian dates generated in my table? I am using SQL query for this. This triggers when I click my Save button for the computation of the premium terms of the customer having an installment payment plan for an item boughtIs there an SQL query to convert Gregorian dates saved into Hijri dates to an Access table?By the way, I am not using any SQL server or Oracle,
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Jan 5, 2011
I am trying to bind an Access database to a MSChart control in VB Net 2008. I have a test database populated with four fields SAMPLE-DateTime, Values-Number, MAX-Number and MIN-Number. I'd like to only display the rows that fall within a specific date range but I'm running into a problem when i try to execute the following command:
cmd = "SELECT SAMPLE,VALUES,MAX,MIN FROM TABLE1 WHERE [CHECK_DATE] BETWEEN 01/01/2009 AND 01/01/2011"
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Mar 18, 2012
I need to add a gridview to my page where the sqldatasource is based on a query that returns records that fall between Sunday and Saturday of the current week. (Each record has one date field) The records are for payroll purposes and the payroll week runs from Sunday to Saturday. I need to find all records that fall in the current pay week.
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Apr 20, 2009
I have three tables,
Products(ProductID, ProductName)
Orders(OrderID, OrderDate)
OrderDetails(ProductID, OrderID) Junction table between Products and Orders.
For example, there are Three ProductID in Products table A01, A02, A03
Four OrderID in Orders table
1. 01/01/2009, 2. 03/01/2009, 3. 05/01/2009, 4. 07/01/2009.
OrderDetails data as below:
A01 -- 01/01/2009
A02 -- 01/01/2009
A01 -- 03/01/2009
[Code]....
then I want to display the date that A03 is not ordered from range 02/01/2009 till 08/01/2009 which could have the result like this.
DateMissingOrder for Product A03 in range of date 02/01/2009 to 08/01/2009:
03/01/2009
07/01/2009
How can I do this in LINQ to SQL Visual Basic?
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Aug 31, 2009
i have an app that pings all IP's on my network and then adds all alive hosts to a list, then my WMI query runs for all of them ips and gets some information. it all works fine except for when it gets to printers and switches/routers which obviously dont support WMI. Is there some way i can check if a device supports WMI and skip the query if it does not?
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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]....
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Apr 29, 2012
I'm receiving an error when trying to query a range of dates from a MS SQL DB in MVC Entity Framework. Unable to cast the type 'System.Boolean' to type 'System.Data.SqlTypes.SqlBoolean'. LINQ to Entities only supports casting Entity Data Model primitive types. This is our query:
[Code]...
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