SQL UPDATE Command With Varbinary (oldvalue = Dbnull)?
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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Apr 22, 2012
I am creating a form that is able to update data in SQL server after selecting an MS Access file (.mdb). I am having an issue where the data has a single quote ('). I found out that the solution was to use Replace() - to replace the single quote with two single quotes - Replace(string, "'", "''").Now, for some reason, I am getting an error "Conversion from type DBNull to type String is not valid." Here is the code.
cmd = New SqlCommand("Update Child Set " & _
"TopLevelProject = '" & row("TopLevelProject") & "' ," & _
[code].....
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Sep 28, 2009
I have an issue with a data base updating it won't update for me in debgging mode it is stopping here on this bit of code which is highlighted in red. the error which comes up is .(update requires a valid update command when passed datarow collection with modified rows.)
Public Sub UpdateDataSource(ByVal ChangedRows As database.dataset1)
Try
'The data source only needs to be updated if there are changes pending.
If (Not (ChangedRows) Is Nothing) Then
[CODE]...
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May 25, 2010
I have been on a database project for a while now. I wanted to be able to make changes to my database using the update command of a Datagridview control.However, I have been faced with a series of unsuccessful outcomes.I want to do this how do I go about it?
[Code]...
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Jun 12, 2011
Here's my code
Dim suppQuery As String = "SELECT [Supplier ID],[Company],[Last Name],[First Name],[Email Address],[Mobile Phone],[Office Phone],[Address],[City],[ZIP/Postal Code],[Notes] FROM [Suppliers]"
Dim dsSupp As New DataSet
Dim daSupp As New OleDbDataAdapter(suppQuery, cnPharma)
[CODE]...
It errors on the da.Update line and by the way if it helps, the text fields are a product of datarowview. that is when you select an item on the listbox the details of that appears on the text fields. and my goal is i could edit those text fields and save them.
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Jan 27, 2010
We know:"UPDATE tt SET Points=" & iPoints & " WHERE Ref='" & sRef & "'"Can we update several records using UPDATE command at one time?
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May 29, 2009
I am completly flummoxed!!! I have writen code for updating my table from a form but when I use the same code only changing the table names it wont work I get the following message: "Update requires a valid Update Command when passed DataRow collection with modified rows" My codes are as follows:
[Code]...
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Feb 11, 2010
is there a way to update a database row with the update command by first defining all parameters and then all values just like you can in the insert command? "insert into table1 (parameter1,parameter2,....) values (value1, value2,....)"something like "set table1 (parameter1, parameter2) values (value1,value 2,...) where ...."?because I only know the syntax to define each parameters value "set table parameter1=value, parameter2=value2... where"
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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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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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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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Mar 21, 2011
My program is doing good when I suddenly bumped into this problem.I dont know how to do the next functionality that I need to accomplish.I am done with inserting values, showing the gridview etc and it works great. Now my problem is the update command.
I have 2 tables
table:tblDest
Fields:
destLastName
destFname
[Code]...
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Jun 12, 2009
i am writing a code where the user will update the staff,but my update command has some problems. i think its the comma's in my command,
[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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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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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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Apr 27, 2011
I am trying to update a column in my database with the date selected from a control on my ASP.NET web page. I need to ensure that the code is correct because nothing is updating in the column.
Code:
Command = New SqlCommand("UPDATE Parking SET ParkingStartDate = @StartDate1 WHERE Parking_ID = @radio)", myConn)
Command.Parameters.Add("@StartDate1", SqlDbType.Date).Value = StartDate.SelectedDate
Command.Parameters.Add("@radio", SqlDbType.VarChar).Value = radio
Command.ExecuteNonQuery()
myConn.Close()
if the column is already NULL, is it correct to use the update statement?
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Jan 16, 2009
I have this code that works for adding a record.
Dim da As New OleDbDataAdapter("SELECT TrainingTitle, TrainingDate, TrainingInstructor, TrainingDescription FROM tblTrainingHistory", TRAININGcn)
Dim ds As New DataSet
da.FillSchema(ds, SchemaType.Source, "tblTrainingHistory")
da.Fill(ds, "tblTrainingHistory")
[Code]...
But I wanted to show the autonumber to the user for reference. How do I know what the autonumber is?
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Apr 30, 2011
i Have a SqlDataBase in Which It Have Three Fields Namely **" mc , amount , customername Now I am Update this Fileds Using Upadte command In vb.net Form now Wat I Need is I Want To Add This New Value While Updating With the Previous Value
[Code]...
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Dec 13, 2011
I am using VB 2005 and the following code returns an error: No value given for one or more parameters. I swear I've done this before without any problems but I can't find my original code.[code]I tested the value of oldid which is set earlier and it does have a value.
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Mar 11, 2010
I have been using examples from the textbook creating a OleDbDataAdapter using the wizard, everything works fine loading the data into the dataset, but when i try to update the dataset, it doesn't save tod the database, can someone please tell me what im doing wrong: I created the data adapter and dataset using the wizard, I binded all applicable textboxes. I do not get any errors the update command just doesn't save to the Access Database.
This is my code
Imports System
Imports System.IO
[code].....
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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 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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Jul 28, 2010
So this is my code... most of it autogenerated... i have created a database, and one table and i stucked trying to update items in table...
Here is the code:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]....
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May 7, 2011
I am trying to update my app via the msi file via command promt for testing, later I will be using Process.Start and setting the arguments. Right now I can get this to work: >msiexec.exe /i <path to msi> /passive ' which requires a UAC prompt, but works with one small window - /qn or /quiet do not work >msiexec.exe /a <path to msi> /passive ' starts the process and then drops with no install So the question is how do I setup the arguments to do a silent install?
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Aug 27, 2009
I am using VB 2008 Express, connected to a MS Access database for some reason my update command is not updating my database.i may have something wrong [code]whats wierd is when i change UpdateCommand to SelectCommand, it will update the database, but it makes other things in my program malfuncation, so i cant have that as SelectCommand, there must be a way to have it all work with the Updatecommand ..
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Mar 3, 2011
I'm not sure if this belongs in the database section or the NET section. I will leave that up to the moderators. I have converted a few of my VB6 systems to NET. However, I have retained the ADO coding technique. I probably need to update that. Below is a sample from one of my applications. As you can see, I retrieve the data and, based on conditions, I then issue an UPDATE command. From what I have been reading (and not really grasping) a DATASET/DATA ADAPTER combination will do the same thing. If so, could somebody rewrite this small block of code using "proper" ADO.NET techniques. If I see my own code rewritten it will be much more meaningful to me.
Dim cnxn As New SqlClient.SqlConnection(cnxnstring)
cnxn.Open()
Dim sql As New SqlClient.SqlCommand
sql.CommandText = "SELECT * FROM PART WHERE LTRIM(RTRIM([PARTNUMBER])) = " & "'" & Trim
[CODE]...
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May 31, 2012
I have a GridView with ItemTemplate. I am trying to approve and reject booking using ImageButton but I do not know where and how to put the sql command to update booking status.I need hints to continue my coding.
Here is my ItemTemplate for Accept and Reject imagebutton:
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:ImageButton runat="server" ID="acceptBooking"
ImageUrl="~/images/accept.png"
OnClientClick="if (!window.confirm('Are you sure you want to accept this booking?')) return false;" />
</ItemTemplate>
[Code]...
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Apr 19, 2011
im trying to add a new record to my DB and im gettin an error on updating the row to my DB De instructie INSERT bevat een syntaxisfout.If you have anny questions or want to have alook at the full application, i can send you all of the code i have...
dsNewRow = ds.Tables("tblWijn").NewRow()
dsNewRow.Item("BWNr") = CInt(txtBWNr.Text)
dsNewRow.Item("Soort") = cboSoort.Text
[code]....
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Dec 5, 2011
In my application, I have a call for an update to a table on my database. I know that it is executing because I get a 1 returned when checking the number of rows affected but when I look on the DB the value is not updated - I have refreshed and still no update. Here is the code, taskgrp_template is type bit and taskgrp_id is type integer. Id is also set to the correct value, as the result of my tracepoint - results listed below code.
mycmd.CommandText = "UPDATE p2_taskgroups SET TASKGRP_template = 1 WHERE TASKGRP_ID =" & id
rowsChecked = mycmd.ExecuteNonQuery()
Tracepoint result: the value of id is 55 and the value of templateCheck is 14 the number of rows affected was 1
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