.net - Linq To Sql Dbml - Get The Size Of A Datatype? Like Varchar(50)?
Jun 1, 2009with linq to sql(dbml file), how to get the size of a datatype?
for an example, varchar(50), how to get that 50?
ADVERTISEMENT
Error Converting Datatype Varchar To Numeric?
Feb 23, 2009I am working with SQL and Vb.net. When I run the following function (shown below) an error is highlighted "Error converting varchar to numeric". Whats wrong with the coding that triggers the error..
Dim query As String
Dim cmd As New SqlCommand
Dim irow As Integer
[code].....
LINQ To SQL And The DBML File / Multiple Database Development
Aug 11, 2009I have a WPF application that uses a SQL2008 database. I have a copy of the database on a laptop and on my home machine. My application is versioned using SVN and I am obviously able go from the work laptop to the home machine and update/commit as required to ensure I am using the latest code for the application.However the database is a different story in that any change I make I create a backup and then transfer the backup to the other machine etc. This way I get the data and the changes made on each system. In order to do this the database connection using a different connectionstring and I change a setting in my app to use a different connection based on my location.
I have now started to use LINQ to SQL and DBML files in my application, and finally getting to the question, I don't know how I can change the connectionstring it uses in code so it will use the correct database in the DBML.Also, is there a better way to transfer the database so I don't need to do the backups and restores? The only reason why I have not versioned the Schema is because I am not sure how that would handle my data as this is key to my development, ie various environment settings etc are stored in the DB and brought through at runtime.
.net - VARCHAR(MAX) SqlParameter Output Size For Visual Studio 2003
Feb 10, 2012In newer editions of .Net I can pass -1 for the output size for VarChar(Max) columns, but in Visual Studio 2003 I get the following System.ArgumentException: Invalid parameter Size value '-1'. The value must be greater than or equal to 0. What should I specify as the size for a VarChar(Max) column in Visual Studio 2003?
View 1 RepliesVS 2010 Datatype Size On 64-bit Systems?
Jun 17, 2011I'm still using ye ancient 32-bit machine with ye olde XP.Currently I'm writing some code to add binary content to files, and I need to know, if the same code can be applied on 64-bit systems.For example an integer variable added to a binary file with:
BinaryStream.Write(SomeNumberDeclaredAsInteger)
can be safely loaded with
MyInteger = BinaryStream.ReadInt32
on my system, but is this also the case on 64-bit systems or should I truncate it to Int32 before writing it to file?
Integer Datatype Not Work In Linq To Sql?
Mar 15, 2011I face a problem that if i make a datattype in sql server of Integer and then use it in linq to sql query it give error of "specific cast not valid" and when i change datatype into varchar the linq to sql query work fine one more thing how to use linq to sql query to make crystal report?
View 2 RepliesAsp.net Mvc - Sorting Datatable With Linq With Correct Datatype Of A Column?
Mar 27, 2012I have this code that use to sort a datatable.
Dim sortingIndex As Integer = orderby
Dim DataTableNew As DataTable = New DataTable
DataTableNew = dt.Clone
Dim query = (From c In dt.AsEnumerable Order By c.Field(Of String)(sortingIndex) Ascending)
query.CopyToDataTable(DataTableNew, LoadOption.OverwriteChanges)
My problem is that with this method I always need (Of String) for it to work, so the date columns are also managed as Strings witch is the problem. Is there a way to use the correct type so the sorting is based on the type of the column?
Using Datatype Object And Determine Datatype In Class Property - Several Integers Columns That Are Null In The Db?
Mar 8, 2010anything wrong with using datatype object and determine datatype in class property? I have a typed dataset and it has several integers columns that are null in the db. and when I make a call it throws exception.is there anythign wrong with setting it as object in my dataset.. changing the throw exception property to Nothing and passing it to my property as integer?
for each row in myDS.DataTable
cRate.CustID = row.CustID
next row
and in my class
Public Property CustID() As Integer
Get
Return _custID[code].............
Convert A TimeSpan Datatype To A DateTime Datatype?
Apr 30, 2002I'm using a 3rd party chart COM object (National Instruments CW graph) to plot data versus elapsed time.The x value needs to be a VB6 equivalent Date type which is a .NET DateTime datatype.What I need is a way to convert a TimeSpan datatype to a DateTime datatype.
Dim testTime as System.DateTime 'date
Dim plotTime as System.DateTime 'date
Dim elapsedTime as System.TimeSpan[code].....
Converting Timespan Datatype To Time Datatype?
Jan 15, 2012I have a database in mysql. The column in table is of datatype time(0)
Similarly I have a control datetimepicker in vb.net I have assigned format property as custom to the control and the CustomFormat property as HH:mm:ss tt so that it can just provide the time. I dont want the date to be in it.
Issue comes when I try to retrieve the value from database I get an error as Converion of type 'Timespan' to type 'Date' is not valid
Try
Dim myCommand As SqlCommand
myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)
[Code].....
Changing DataType To An SQL Or Database Datatype?
Jan 2, 2011I am working on a produce inventory database in my VB Express program.I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.I know that there's an insert function.I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet.HOw do I use CAST or do this?Here's the function I am using:
Me.TableAdapterManager.InventoryTableAdapter.Insert(IDTextBox.Text, fruitName, unitprice, unitsize, unitIn, unitTransit, unitOut)
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.Also how do I use the CAST and Convert functions
C# - Adding DataAnnotations To Auto-generated DBML Class?
Feb 17, 2010i'm worried about doing this since my changes will be overwritten when the dbml file is auto generated again (as they often are).i'm thinking of doing a partial class and writing out the same properties to annotate them, but worried that it will complain about duplicates, and the reason i can't even experiment brings me to the second part of my questions...
that, the expandable arrow on my dbml file listing is missing, right clicking and selecting "View Code" just displays an empty partial class as below.
[Code]...
Opening Dbml. The Operation Could Not Be Completed Unspecified Error?
Mar 9, 2010when i double click my dbml file at the solution explorer, I get this error: the operation could not be completed. unspecified error I'm working on a VB.Net project, using visual studio 2008, mssql 2008.
View 7 RepliesLoop Inside Every Tables/columns In A Dbml File To Create New Partial Class?
Aug 6, 2009I have a class that add extra information about a column for linq2sql (see code below) right now, I have to explicitly tell what column I want that info on, how would you put that code with a loop on every column in every table from a dbml file? I was doing my test on a very very small DB, now I have to implement it on a much more bigger database and I really don't want to do it manually for every tables/columns it will take hours.
how it's being used:
Partial Class Contact ''contact is a table inside a dbml file.
Private _ContactIDColumn As ExtraColumnInfo
Private _ContactNameColumn As ExtraColumnInfo
Private _ContactEmailColumn As ExtraColumnInfo
[Code]....
ASP.NET 2.0: Cannot Convert VarChar To Int
Aug 21, 2009I have an ASP.Net form, where it grabs a value from a textbox:
[Code]...
Structures - Fixed Size (Overall Size And Item Size)
Jun 8, 2011Now all went well about from using the structure correctly. The working of the structure was perfect. How ever i missed Two important issues. The structure needed a fixed size of 10 items (9 in programming terms starting from 0) And also out of the 5 items allowed to be chosen as one of the member types for the structure a limit of 5 items of that particular type.
[Code]...
Add Varchar Parameter To MySQLCommand?
Aug 22, 2011I'm trying to execute a MySQLCommand like so[code]...
It seems to be something to do with the "size" parameter, but I don't see what is wrong with it.
Increment Varchar In VB 2010?
Dec 7, 2011How can i increment varchar in vb.net 2010?.
[code]...
Varchar To Numeric Error
Sep 20, 2010I have a textbox where I can enter a number. If the number exists in my sql database then it would change the label accordingly. It seems to work with any input number except for numbers starting with zero. If I input a number starting with zero(012345678) I get the error: Arithmetic Overflow error converting varchar to data type numeric.
Imports System.Data.SqlClient
Public Class ValidateForm
Private Sub MineralCloseButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MineralCloseButton.Click
[Code]......
Datatype - Use Value (23 - 32) In Sql Column And Comma In Column Datatype Int
Mar 27, 2011how can i use value (23,32) in sql column datatype int how can i use comma in column data type int
View 8 RepliesC# - Stored Procedure Return Varchar Value
Jul 1, 2010I am trying to create stored procedure that gone return varchar value, and that value I need to display in textbox. This is the code for stored procedure:
[Code]...
Insert String With Comma Into Varchar?
Aug 10, 2011I'm trying to insert a string that contains a comma into a varchar in vb.net. How do I make the insert statement I'm building understand that I want "X,Y" to be in the varchar and not X in the varchar and Y in the next column?
View 1 RepliesSave The Data Of The Varchar In The Settings?
Jul 1, 2010im making this simple app and i want to know
Let the user add collums?
let the user remove collums?
let the user delete rows?
how to change the the varchar of a row?
how to save the data of the varchar in the settings?
Search A Varchar Field In A Sql Database?
Aug 16, 2010how do i search a varchar field in a sql database and get rid of the char unless it is an number 0 thru 9 and then add that number to the monthly calendar todays date to determine a due date?
View 4 RepliesStored Dates On Dt Column As Varchar?
Dec 5, 2011My mssql database:
id(int)
dt(varchar)
txt(varchar)
i stored dates on dt column as varchar. How to i select data by datetimepicker like:select * from table where date='"+datetimepicker.value+"'
VS 2008 Sql Convert Varchar To Datetime?
Jul 8, 2009I got the dates stored as varchar(100). I need to get them sorted when I use these records but I can't now because they are not stored as datetime. Is there any other way to sort dates or if somebody know would I loose my data if I would try to convert the column from varchar(100) to datetime now as it holds my dates or maybe it would convert ok?
View 33 RepliesWhat To Convert String To Work With Varchar (51)
Mar 11, 2010I am using an INSERT INTO statement and one of my database variables is a varchar(51). Can a string be directly stored as a varchar or do I need to convert this to something else beforehand?
View 1 RepliesConversion Of A Varchar To A Smalldatetime Results In An Out-of-range Value?
Jul 10, 2009The code:
strSql = "insert into table2 (transactiondate) values ('" & transactiondate & "')"
seems to be giving me the runtime error:
[code].....
Converting VarChar To Numeric - ComboBox Not Saving Value
May 19, 2011I've got an unusual error regarding converting a varchar to numeric. I have code which goes through and adds the data to the database. When the code attempts to add the new data to the database, an error message appears highlighting the following line of code:
check = cmdCDQAssets.ExecuteReader.RecordsAffected
Sql Insert Parameter Of Varchar Data Type?
Oct 7, 2010Here is some code I use for creating a table and the data adpater for it...
vb
Dim cmdString As String = String.Format("CREATE TABLE {0} (" & _
"EventID INT IDENTITY(1,1) NOT NULL, " & _
[code]....
