MS SQL Server, Indicating VARBINARY(MAX) Field's Datatype In .NET?
Oct 13, 2010
I use a VARBINARY(MAX) column, because I have no idea what is going to be put into it. All I know is that as of this point in time, the data will be one of many traditional data types(Integer, String, DateTime, etc.)I also have another column that is meant to indicate the DataType so the .NET application can handle the data and validate input accordingly.Right now, for testing, I have a DataType table in my database that stores the "supported" datatypes for the VARBINARY column, and a foreign key linking to the column meant to indicate the DataType. This works perfectly, but it feels akward.
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Jun 10, 2009
A partner of ours is making a call to a web service that includes a parameter called token. Token is the result of an MD5 hash of two numbers, and helps us authenticate that the user using our partners system. Our partner asks the user for two strings, concatenates them, runs them through MD5, and then calls our web service. The result of the MD5 is the token, and it is submitted to us as a string.
We store valid tokens in a DB - since we use the SQL Server to compute the tokens on our end, SQL seemed to be happiest storing the tokens as a varbinary, which is its native result for an MD5 computation.
We have two pieces of code that attempt to do the same thing - run a select query that pulls out a value based on the token submitted. One uses a dynamic query (which is a problem), but it works. The other one attempts to do the same thing in a parameterized (safer) fashion, it does not work - it is unable to locate the token.
Here's the two competing attempts. First, the parameterized version which fails:
byteArrayToken = System.Text.UnicodeEncoding.Unicode.GetBytes(stringToken)
scSelectThing.CommandText = "select thing from tokenstable where token=@token"
Dim param As SqlParameter = scSelectThing.Parameters.Add("@token",
[Code].....
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Aug 3, 2009
I'm trying to test a varbinary(max) field to see if it's null. I'm trying to figure out if it's a null or not in the select statement, hoping to avoid having to do this locally for every row of the returned dataset. This is the SQL I'm using,
[Code]....
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Jun 5, 2012
When I try to query an entity that has a varbinary field in it I am getting error:"The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities."
Here is my query:
Dim query = From entity In db.Entity
Where entity.Id= Id
Select entity.VarBinaryField
[code]....
The error gets generated when I check that the query isNot nothing.
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Feb 2, 2010
I have numeric data that I am getting from a database. They are all numeric, but they are a mix of int, money and real
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May 7, 2010
i am using vb.net 2005 and ms access, i have a column called accountnumber in ms access. i want to enter 14 digit number in that column, i am confused to choose which data type, because longint cannot accept more than -2,147,483,648 to 2,147,483,647.
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Sep 10, 2009
I have a table with a Real datatype field. I just can't multiply it with other integer fields although the editor doesn't show any error - the result is always '1'.
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Nov 26, 2009
I have a field in a SQL Server table that is of type bit.When I try to use a Boolean in VB.NET when passing parameters to a stored procedure, there are never any matches. I have also tried passing an integer to the stored procedure and that does not work either.
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Mar 28, 2010
How can I use BigInt datatype of sql server in my vb.net code?
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Dec 26, 2008
how to work with XML.I need to create an multilingual application and need to save the controls captions in sql table with xml data typei started the following:[code]I know this is not very professional but thats all i did until know in SQLNow i have a problem in VB.NET i don't know how to read an xml data type (How to get the value from variables).If somebody can give me an exmaple how to read the xml than i would continue translating for each objects in the form where name is like the variable "btnLogin" and give it the controls.text property to the variables value.
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May 13, 2011
what are the changes I need to for my DAL to support this.
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Mar 8, 2010
anything 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].............
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Jan 28, 2010
I'm attempting to pass in a collection of dates to a T-SQL 'IN' clause via a date array (see below for how data is collated).
'Workout weeks difference between start and enddate
Dim wksDifference As Integer = CType(DateDiff(DateInterval.WeekOfYear, bookingStartDate, bookingEndDate), Integer)
[code].....
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Mar 14, 2011
In Mastering VB2010 on arrays, a command is show indicating the reversed contents of an array can be assigned to another array.
ReversedArray = System.Array.Reverse(ArrayName)
I can't get this to work and part of the problem is how to set up (dim) the ReversedArray. When I enter this I get a squiggly line under the right side of the equation and an error message saying no data is produced by the expression.
I get the same error with a copy command:
CopiedName = System.Array.Copy(Name, CopiedName, 10)
How do I set up working code to reverse or copy the contents of an array?
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Apr 30, 2002
I'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].....
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Jan 15, 2012
I 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].....
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Sep 11, 2011
The following code produces a sound that's like a tone or a soft bell, indicating that an action has completed successfully:
System.Media.SystemSounds.Beep.Play()
Any code for the opposite? You know like if you tried to do something in Windows that was invalid. Is there some kind of default sound indicating an error that I can invoke on a Windows computer in VB.Net similar to the one above only discordant?
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Feb 1, 2010
I am trying to use a class that I created. However, I get an error indicating the class name or rather "contactClass is ambiguous. How do I correct this?The following error of code:
Public newcontactClass As New contactClass Recency
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Oct 7, 2009
I wanted code to convert the varbinry to pdf and save it on Clients machine.
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Jan 2, 2011
I 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
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May 2, 2012
I have column with bit datatype in sql server table(2008).while returing to text box its returning true in text box instead of 1.i tried converting it from true to 1 using txtboolvalue.text=Math.abs(CINT(ReturnList.Item(34)).tostring. But it doesnt convert true to 1
Secondly: im checking for columns in datatable if there are any nulls. its checking for nulls in the sqlserver table but its returning true if there is a null.i just want it to return NULL is there is null i textbox..
CODE:
Then
CODE:
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Apr 3, 2010
I am writing a small app that reads in a .pdf file using the below parser to a Varbinary(Max) column in a sql table[code]....
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Jan 25, 2011
I have a problem which I have not been able to find an answer to in months. I store word doc resumes as varbinary(max). I can retrieve the resumes based on a full-text search no problem. But the resumes are retrieved as word documents in a .ashx file with the following code. I really need to implement hit highlighting on the site so that users can see if the returned resume is a good fit or not.
I don't think this can be done from an .ashx file, so I think I need to be able to open the resume as html in an aspx page and maybe use javascript to do the hit highlighting or perhaps return the text only content of the word document somehow and manipulate the text before display with html tags.
[Code]...
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Nov 10, 2011
I've found solutions to determine the length of an audio file using WMPLib.WindowsMediaPlayer (which seems quite ugly), by using a physical file path, but nothing to determine the duration of an audio file stored in a VARBINARY field (SQL Server 2008 R2).I'm using .Net WebForms. Maybe it'd be a better idea to do this client side with jQuery, but what if I only want to expose some controls to the web browser based off of the duration?
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Jan 4, 2011
I am using VISUAL BASIC 2010, SQL Server 2008. I need to update a Table with SQlDbType Varbinary. Just for sake of Murphy loving me I gave it Varbinary(100) - while max. field lenght is 20 Non Ascii Characters on the UI Side.User is changing data in a form, data gets encrypted (into a Byte Array) then sent to the BL of the program, the business logic talks to SQL Server and fields in the Table are updated nicely with new binary values.
A problem arises however with a field that is allowed NULL values in the data table. I can retrieve NULL values from the Database and assign them the "Nothing" value. (User Interface shows a nice blank field). Once the user however changes that empty field(containing "Nothing" as value) with any data then my cmdSql.ExecuteNonquery reports no changes. (rowsaffected = 0)
I strongly suspect that I am making a mistake in the parameters of the SQlCommand of the OldFullname value, but as I said I am staring myself blind. Please review my code below and tell me where I am making that mistake...
FYI: OldFullname can't be "Nothing", and its current field is SQL NULL. All fields (except UserId) are Varbinary. Update succeeds as long as OldFullname SQL field contains data - only not when it is NULL. I don't want to set a standard value on the column (NULL or such).
Public Function SaveToDatabase(ByVal OldUser As blProgramAccess.userEncrypted, ByVal NewUser As blProgramAccess.userEncrypted) As Boolean
Dim bSaved As Boolean[code]....
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Jan 19, 2011
I am working on an application that pulls a field from a SQL Server table that has numeric values separated by commas, for example (1, 3, 4, 6). I need to load this field and somehow load it into a numeric array. However, I can't seem to come up with a good solution. Here is what I have tried:
Dim PagetoSign as Integer()
PageArray = Split(_DataRowView("PagestoSign"), ",")
Dim _PagetoSign As String = ""
[Code]....
However, I receive an error message when it enters the for each loop. I'm not married to this method if there is a more elegant way.
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Jun 15, 2011
Possible Duplicate: Retrieve identity value from inserted record's primary key.I have a field with a unique field (that I don't have to update automatically) called ID. I'm using this code to add a field to it:
DB.Snippets.AddSnippetsRow(10, 0, Leaves, Coins, Date.Now, Language, Username, Description)
What I need to be able to do is get the unique field it adds. It +1's to ID every time I add a field there, but how do I get that without hacky database looping?
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May 11, 2009
I know how to insert a new row into a table that has a binary column. But is there any way to update the binary column once that row has been added? So far an exhaustive google search has turned up nothing. Get the current row that I wish to update delete the row that I wish to update Create a new row with the information from the row I wish to update plus the new binary It just doesnt seem very elegant, and I was hoping I could do the same thing with an update statement. Here is the updated code I am using now for reference
[Code]...
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Sep 15, 2010
I have a column in a table that contains a message and I want this message to be displayed in a label. Here is my code which currently doesn't populate the label.
Protected conString As String = ConfigurationManager.AppSettings("sqldirectory")
Dim cnn As New SqlConnection(conString)
Dim cmd As New SqlCommand("select message from [database].[dbo].[table]")
[Code]....
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Feb 18, 2011
I am calling a Java-script function, in that i am passing the value of hidden field, that hidden field i want to use at server-side, but the value of hidden field is null.[code]...
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