Approach/data Type(s) For A Date And Two Times In .Net 4?
Aug 26, 2010I've got a method which takes some parameters and generates some XML to be sent to an [archaic] web service.
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Data Type Mismatch Between Vb Date Datatype And Ms Access Datetime Data Type?
Dec 27, 2010I'v designed a ms access database table with one field having Datetime datatype. I can Insert data into it from vb.net front end by trns_dt DateTime.Now.DateBut when I fetch records from the tableand assign the dataset datasource as da, it shows datatype mismatch error.
daleDbDataAdapter("SelectDaily_Transactiondtp_from_dt.value dtp_To.value con)
dsDataSet
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Data Type Is A Nullable Date That Returns A String Value If Date Was Supplied?
Mar 11, 2010I am currently working on a custom data type, and wanted to implement a = operator.
I data type is a nullable date that returns a string value if date was supplied.
I want to allow the variable to be set like this
Dim nd as New NullableDate nd = Today Does anyone know how this can be done, or can anyone point me in the right direction?
VS 2005 What Approach For Passing Null Value To Date Field
Mar 25, 2009i'm not 100% sure about sql server but i think it doesn't accept null value for date type columns but in oracle, a date column can accept a null value. and since i'm using oracle, this is causing some problems because in my form, a textbox item bound to a date column will not accept a null value. reading thru some threads, it would seem that it is not possible to pass a null value to a date type in .Net.
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Error Date / Time Data Type
Aug 25, 2011I have a problem regarding to the date and time.im using combobox for the date and i make of variables..this is my code.[code]i dont know what is my error..but my syntax to insert data its correct..
View 3 RepliesColumn Named EndDt Having Date/Time Data Type?
Mar 17, 2010I have a table named fec in which i hv column named EndDt having Date/Time Data type.Now i want to display those records in my report which have EndDt less than Date i pick from DateTimePicker and month is current month.Private Sub DtpDefault_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DtpDefault.ValueChanged
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Show Datatime Data Type In DataGrid But Date Or Time Only?
Feb 28, 2012i'm doing attendance monitoring system. i cant find out how to show datetime in datagrid taht will shows date or time only.
View 10 RepliesBest Approach For Data Manipulation?
Jul 28, 2009I understand that there are several ways of Inserting, Updating and Deleting records in a database such as DataAdapters, DataSets, TableAdapters, SqlCommandBuilders, Parameterized SqlCommands, StoredProcedures, etc, etc,etc. According to David Sceppa Sprocs are the most preferred. Ok, I go with him on this one (who am I to challenge him anyway?).
My question is, apart from Sprocs, which of these options is the BEST for a large commercial database application and why, taking performance into account? What are the benefits and drawbacks of each option?
Data Type Mismatch In Criteria Expression In Date Related Fields
Jun 8, 2012I would need to update a record using inline SQL string, when I use the first SQL string I get the error "data type mismatch in criteria expresion" but when I remove the time fields and run the SQL string the code works
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Microsoft Data Access Application Block Date Type Precision?
Jul 13, 2009We are working on an ASP.Net/VB.Net application using Enterprise Library for our data access (DAAB).
We are trying to store DateTime values in an Oracle Date field. However, the precision is being lost. Currently only the year, month, and date are being stored. We need better precision than this.
Oracle Dates are supposed to "includes not just the month, day, and year, but also
the hour, minute, and second. "
Best Approach To Store Node Coordinate Data
Dec 24, 2009I have a question on the best way to store model data for my app. My app will basically be drawing a bunch of elements (lines) connected to a node at each end. Im trying to decide how im going to store my node data (as well as element data). The node data im trying to store will consist of the node XYZ coordinates and some other info about the node. The element data will consist of the node numbers at each end plus additional info about the element. There a number of ways i've been thinking i can do this. They are:
1) Store my node/element data as a Dictionary object, where the key represents the node/element, and the value would be an array of the information i want to store.
2) Create a "Node" structure and an "Element" structure to store the info i want. Im a bit worried here as my model could potentially have thousands of nodes and elements.
3) Create a "Node" datatable and an "Element" datatable, and store my info in those instead. I can see some advantages in this in regards to displaying information to the user in datagridview etc. But then again i can easily pull the required data from a method i mentioned above, and generate the datatable when required.
Not quite sure what the best approach is. Either way i do it, i will be serializing whatever object i use to save the data to disk.
Design Approach For Utilizing Data From A Database
Nov 6, 2011There exists a database that holds information on each planet in the solar system. The database has multiple tables.The program intends to access this data to display it to the user in a variety of manners. The program does not intend to manipulate the data at its source, though calculations on two fields may be performed to determine certain display characteristics.What is the optimal method for accessing the data?My initial approach, (read: gut feeling, no research) was to take each related row of data from the database and create an object of a custom class based on the data. So you might wind up with:[code]Then use these objects to perform whatever actions the program needed to. I ran into a lot of problems trying to implement this, so that I believe my design approach is fundamentally flawed.
View 1 RepliesSql - Available Times From The Date Selected
Apr 18, 2012I am creating a booking system, I have got it all working so that a user can select a date and a time and book, there are no restrictions so 100 people could book the same date and time.
My lecturer suggested to me that to make it so that just one person can book one time on one day the user will select a date and then the page will re-load with the times selector only showing the times which are available on this date.
I have done some tutorial work similar to this, however a little more basic showing the available slots using an except operation for example allavailableslots except bookedslots, but there was no restriction on dates, so it would just show all the times which havent been booked yet full stop. I think I will use an if statement but I am not too sure, dont really know where to start...
my tables and fields are as follows
App
Bookingid
Petid
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Performing Task Between Two Date/times?
Oct 16, 2009i'm trying to set a discount to a product between two dates / times.Is it possible to achieve it?Are there any examples
View 3 RepliesVB 2008 Compairing 2 Date And Times?
Dec 2, 2009im struggling a bit and was wondering if anyone can help. Im looking to compair 2 sets of datess and times, for examp2 textbox1 27/02/1980 23:00 and text box 2 having the real time date and time. But instead off having years days hours mins and seconds i want to display how many seconds has passed between the two date and times. Can anyone show me how this is done as i have no clue where to start.
View 3 RepliesClicking On A Date Several Times And Have The Display Show Always?
Dec 16, 2010clicking on a date several times and have the display show always
View 4 RepliesDisplay TImes Based On Selected Date?
Jul 11, 2011I have to display the available times in a dropdownlist called "DDL_avalTime" based on the date selected in a ASP calendar.
How the program works is that when a User clicks a date form the caldendar, it checks the SQL database. In this case the table that I'm retrieving it from is "trainerbookings" from the column "trainingDateTime". The data type for this column is datetime.[code]...
File Creation/modified Date/times?
Mar 16, 2010I created a background thread that constantly scans a specified folder for any .xls files that are created or modified. These files come from a vba macro in outlook that will automatically save the attachments of the mails in the this folder. This will update the modified date/time, or at least it seems to.
For Each fi In aryFi
fidate = System.IO.File.GetLastWriteTime(path & fi.ToString)
fidate1 = System.IO.File.GetCreationTime(path & fi.ToString)
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Everytime I check to the code, the fidate and fidate1 variables are indeed the correct dates/times of the file it's currently checking. It almost never gets inside the elseif block at runtime though.
VS 2008 : Get The Time Difference Between 2 Date & Times?
Jan 17, 2011how to get the time difference between 2 date & times Where
from_time falls >= 22:00 of the From_date & the to_time falls <= 06 of the To_Date
for example:
From_Date = 01/01/2011 20:00 ' Where Work Started
To_Date = 02/01/2011 08:00 'Where Work Ended
Time_Covered_Between_22TO06_As_Night = 22:00 to 06:00 is 08:00 hrs How to equate it?
VS 2008 Duplicate Date And Times In A Datatable?
Jan 16, 2011Having problems with a datatable which consists of multiple datalogger information. Within the datetime field there are as the name suggests listed date and times entry i.e. 12/01/11 22:56:56 ect ect.
Problem is i am graphing this and when ms chart reads the duplicate entries as a series. It doesnt like it and comes up with a slightly odd interpretation. I need to get the duplicate entries out to establish a single time series.
I was proposing to clone the original datatable and run a loop to remove the duplicates. I have been trying to do this for days and have played with a whole load of examples, without success. Can anyone point me in the right direction on this.
How To Find And Type 2 Times In A Table
May 10, 2011The Project: We have ten athletes and the user defines the time they did. Those times are saved in a table called times(10). Clicking a button calculates the minimum time, the maximum and the average time. Also it finds the place of (i) in the table and sends it to a TextBox. The Problem: What if we have 2 same minimum times, for example (10 sec and 10 sec) or 2 maximum timThe
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim max As Double
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Type Text Into Richtextbox Multiple Times?
Apr 19, 2011I know this sounds really bad but I can't seem to figure this out. I am creating a template to use in a form. I have a few buttons that when I click on them will auto type out text into a rich text box. I figured it out for just typing in the text into the richtextbox. richtextbox1.text = "my text goes here" But if I hit the button more than once it doesn't keep adding the text to the rich text box. How can you program a button to enter a text as many times as you click the button?
View 1 RepliesParameters Data Type - Add Parameter With Same Data Type As Column Data Type
Feb 26, 2012For each column in data table i want to add parameter with same data type as column data type. But looks it's not that simple.
Dim cmd As New SqlCommand
Dim dType As New System.Data.SqlDbType
For Each cl As DataColumn In DataTable1.Columns
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How can I do this?
[2005] Date AND Time Picker - Only Be Used For Entering Dates Or Times But Not Both?
Mar 16, 2009Is it just me or is it so that a DateTimePicker can only be used for entering dates or times but not both?
View 9 RepliesValue Of Type 'System.Linq.IQueryable(Of Date?)' Cannot Be Converted To 'Date'
Dec 6, 2011I'm trying to get datetime value but here is issue with nullable datetype.
Public Function GetDate(ByVal kodg As Integer) As DateTime
Dim g = From dt In db.xDates _
Join f In db.xGrafiks On dt.КодД Equals f.DateKod _
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Forms :: Error - Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Oct 10, 2010I'm getting the error "Conversion from type 'DBNull' to type 'Date' is not valid."here's the line generating the error.
dtReady.Value = dSet.Tables("Db").Rows(Inc).Item("Fixed_Date")
I'm using a date/time picker control and sending the db value to it. I know that the value is null, but I don't understand why the Picker can't be blank. Is there a way to let it be blank? Or should I set up a way to check for nulls and assign today's date or something just in case?
VS 2010 : Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Dec 30, 2011When I close my form without saving I want to check if the data on my form has changed since the last time I saved the data.This peace of code, which I included at the bottom always worked fine.Except when I compade a DateTimePicker with a null value in the db.Than I get the error "Conversion from type 'DBNull' to type 'Date' is not valid."Probably on this peace of
Me.dtpVrijeDatum01.Value.Date <> CDate(reader("VrijDatumVeld01")).Date Or
Me.dtpVrijeDatum02.Value.Date <> CDate(reader("VrijDatumVeld02")).Date Or
Me.dtpVrijeDatum03.Value.Date <> CDate(reader("VrijDatumVeld03")).Date Or
Me.dtpVrijeDatum04.Value.Date <> CDate(reader("VrijDatumVeld04")).Date Or
Me.dtpVrijeDatum05.Value.Date <> CDate(reader("VrijDatumVeld05")).Date Or
The total code to check the changes is:
Private Sub CheckForChanges()
LeesCheckboxWaarde(Me.chkFacAdrIsBezAdr, intCheckFacAdresIsBez)
LeesCheckboxWaarde(Me.chkPosAdrIsBezAdr, intCheckPosAdresIsBez)
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VS 2010 Conversion From Type 'MySqlDateTime' To Type 'Date' Is Not Valid?
Apr 7, 2012I'm storing dates intoa table like:vb.net "INSERT INTO myTable (datum) VALUES ('" & Convert.ToDateTime(dgvrow.Cells(0).Value).ToString("yyyy/MM/dd hh:mm:ss") & "'" & ")", conn) This works perfectly. After storing the dates I need to load /show them into a MonthCalendar. This is where the error occurs.
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.net - Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Jun 22, 2011I have a query in my DAL that results 1 item, a date. It's either a date or null. But I get an error when the value is null. Conversion from type 'DBNull' to type 'Date' is not valid. Query
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Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Jul 14, 2011I am getting this exception from the following VB.NET code for only certain months: System. InvalidCastException: Conversion from type 'DBNull' to type 'Date' is not valid.It happens on the line:if CDate(dRow("CompleteDate")).ToString("d") = arrWeekYear(i, 1).ToString("d") Then.If I understand this correctly, then the problem is I am trying to compare some NULL values for CompleteDate to a non-NULL value.However for some of the more recent records, it does not. But I am able to get output from the T-SQL query with same date range and there are no errors; it runs quickly also. And I examined this T-SQL query for both "Date_ Completed" and "Review_Date" NULL values, but either way,"CompleteDate" was always = NON-Null value.So I do not understand how this is happening.[code]When I add this line above the error-causing line above, my report times out for these months.If Not dRow("CompleteDate") Is System.DBNull.Value Then
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