Zipping File Stored On SQL Server As Blob Image Field
Jul 14, 2010
I'm trying to zip a file that is stored on SQL Server as a blob image field and when downloading the zip file it says the file is corrupted.. or the file will open but contains some crazy characters. I've tried WinRAR and 7zip and no luck. I checked out [URL] and tried to kind of combine the browser attachment code and the memorystream/byte array code and no luck.
Here is my code snippet:
Try
BinData = DirectCast(dt.Rows(0)("ImageField"), Byte())
Catch ex As Exception
End Try
Dim blen As Integer = BinData.Length
[Code] .....
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May 14, 2010
Trying to insert a large audio file into an Oracle 10g database and keep getting this error:
ORA-01460: unimplemented or unreasonable conversion requested
The byte array length of the audio file is 2702577. The procedure works with smaller array lengths, but not the larger ones.
Here is my code:
Dim oracleConnection As New OracleClient.OracleConnection
Dim Cmd As New OracleClient.OracleCommand
Dim oracleDataAdapter As New OracleDataAdapter
oracleConnection.ConnectionString = System.Configuration.ConfigurationManager.AppSettings("MasterConnectionODT")
[Code] .....
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Apr 25, 2012
I have a field in a SQL Server 2005 DB of type 'image' that contains documents, mostly pdfs. When I view the field in the database, it looks as though the data is stored as a hex string. I have extensively googled and came up with the VB.net function below to convert the field to an actual file, but it only outputs a file containing the string of hex characters rather than the file that the field is supposed to represent.
This is a sample of the fields' data (I have truncated it for privacy purposes):
[Code]....
And is it possible to open the file straight from a query in SQL server?
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May 4, 2011
I'm trying to read a binary file from a FileMaker 11 container field using Filemaker's own ODBC driver. I was able to write files to the database and this works fine. retrieving them manually works fine and the files look OK and are not corupted. However when retreiving them using VB.NET, and if the file size is approx > 5MB, I get the following "uncatchable" error (yes thats right, I cant "Try Catch End Try", it just crashes):
System.AccessViolationException was unhandled
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
[code].....
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Sep 19, 2011
How can I declare a blob field in an access database with SQL?
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Feb 25, 2010
I had been using this way for while, and it seems it work fine with char and numbers.
Dim MyVar1 as String = "Hello"
Dim MyVar2 as Integer = 1
Dim MySQL = "Select * from table where field1 = '<field1>' and Field2 = <field2>"
MySQL = MySQL.Replace("<field1>",MyVar1).Replace("<field2>",MyVar2)
msgbox(MySQL)
But, when I have to deal with blob field, where I store "wav file" for example, I had to read it as array of bytes, and the only way I find to insert the array of bytes in my query string is by using the command.AddParameter
Dim myfile As System.IO.FileStream = System.IO.File.OpenRead("full_wav_file_path")
Dim myArray(myfile.Length) As Byte
myfile.Read(myArray, 0, (myfile.Length))
[Code] .....
Is there another way to insert it without addParameter?
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Jun 10, 2011
I have a database designed and implemented using ms sql server 2005. initially, the user has entered the pictures with a very big size because there was not restriction. now when the user is opening the crystal report so it takes alot of time and some time memory full problem occur. now i want to reduce the stored images size using vb.net. is it possible? can you help me.. because there is nothing impossible as per my experence.
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Nov 2, 2011
I'm calling some data from my Oracle table and I have a field which is called 'image1' which is a BLOB field.
Sometimes an image is input into the field and others it's not. I need a way to read the BLOB field to see if its a blank and then show/hide my label based on its contents.[code]...
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Sep 30, 2010
I created an application in which the user has to specify the number of rows and collumns. Once these are specified, a Table Layout Panel creates these number of cells with each cell having a button and a Text Box inside it. On the double click of a button, the user can change the background image of the button, specify the sound for it and similarly fill in the text box too. The sound specified should be played on single button click. Once done for all the cells, it would look something like this.[code]...
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May 5, 2009
I am Delphi programmer and I am new in .Net VB code to get text from sql server image field to StringCollection, in Delphi I use code:
MemoryStream := TMemoryStream.Create;
BlobStream := SomeQuery.CreateBlobStream(SomeQuery.FieldByName('MY IMAGE FIELD NAME'),bmReadWrite) as TBlobStream;
BlobStream.Position:=0;
MemoryStream.LoadFromStream(BlobStream);
[Code]...
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Oct 14, 2009
I have the following code below. I am reading a BLOB image from database, but when I try to display it in the picture box I am getting the 'Parameter is
Code:
Imports System.Drawing
Imports System.Drawing.Imaging
[code].....
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Feb 15, 2010
I have a project where the user wants an image stored in a Blob field of a MYSql database. I have been searching for info on the net but so far have not found a good solution for this.In this case the record will already exist in the database and I will need to insert the image into the existing record based on the recordid.Is there a simple way to do this perhaps with a stored procedure and an execute statement. I have very little experience with MySql and little with storing images in a database as well. Most often I will store the images as files and use a pointer in the db record but this user wants it in the db so here we are.
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Aug 7, 2010
im trying to upload my image to my database. I've searched and found a way to do this by uploading the image as a blob to the database.On the field IMG on my Database I have set it to BLOB. how can I send a image to the field?
PS. I tried
vb.net
Dim sqlquery = "INSERT INTO `decap`.`test` (`MD5`,`img` ,`value`)" _
& "VALUES ('C20E743343GDG'," & (OpenFileDialog1.FileName) & " ,'0')"
No luck. I get a file of like 3bytes.
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Aug 29, 2009
I'm working on a simple image tagging and searching app. I've got my images uploading to the DB, the tags being applied, but am failing when I pull them back - the images don't render. I found this here on SO, but I'm not able to get it working.
[Code]...
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Aug 12, 2011
I'd like to email my app folder, setup and exe (the 3 files VBnet creates) to someone -- tried to zip it but it won't go.
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Apr 11, 2009
How do I store BLOB data (e.g. image, document) into the database?
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Jan 20, 2009
I'm trying to assign an image which is stored in mySQL database to PictureBox item.
Here is my
...
Dim rs As ADODB.Recordset
rs = New ADODB.Recordset
Dim mystream As ADODB.Stream
[code]....
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May 30, 2011
I'm trying to use a combo box to change the image in a picture box to one that's stored in an external folder. The plan is to, in code, take the part of the file's location that will be constant and concatenate the file name to the end. The file name is stored in a database.
[Code]...
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Feb 25, 2011
I have a client/server application set up that the client sends a word file to the server and then the server converts that word file to a .TIF and sends the image back.The stuff I have now works.Say if I sent the size of the file and the actual file byte() to the server back to back, would the NetworkStream contain both back to back? This what I though would happen. So I implemented a kind of 'turn' based interaction during the duration of the conversion process.
[Code]...
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Nov 19, 2009
I have pictures of each employee stored in SQL database with Image database.
Select pic from empimages where emp_ID=10
give the picture of that employee in binary format.
How do I create a physical jpeg in C:images folder based on the above query in vb.net.
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Apr 25, 2011
how to store CSV & Text file to an Image Field in SQl table. the table is using by some other application that's why i could not change the field data type.
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Sep 18, 2008
I am interested in uploading an image to a file field using httpwebrequest or similar however I am stuck on a few things. Would it be a matter of add the file field and the image I would like to upload as the value? I'm not looking for code, I would like to learn how this can be accomplished.
[Code]...
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Apr 28, 2010
saving data from a text field and multiple combo boxes to a file on a server in visual basic 2008
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May 13, 2010
ASP.net app inserts Microsoft Windows 2007 .docx file into a row on DB2 OS/390 Blob table. A different VB.net app gets the DB2 OS/390 Blob data. VB.net app kicks off Microsoft Word to open the .docx file but then Microsoft Word pops up a message that the data is corrupted. Word will allow you to fix the data so the file can be viewed but it is extra steps and users complain.I've seen some examples where .docx can be converted to .doc but they only talk about stripping out the text. Some of our .docx have pictures in them.
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Mar 17, 2009
I am recieving an error when I am trying to write a blob file to MySQL. figure out what I am doing wrong. Here is my code:
[Code]...
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Sep 7, 2010
I am using stored procedures in my application using vb.net, while executing stored procedures on mysql database server thru application, the response time from the server is more. Is there any settings that i need to set on mysql db server or any changes in connection string or in code.
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Sep 22, 2009
If I have a store procedure that call the 'field_name' and 'field_id', but I want to enter the 'field_name' into a form where I need to select information that will be used in a Crystal report. When I enter the 'field_name' it needs to use the 'field_id' as a parameter for the selection of the data on the report. How would I do that?
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Jan 12, 2011
I just wondering can Itext done the following function before i dive into it.I want to develop a window application, and schedule this application in my server. This application should query the data from (oracle) and with itext help (i hope it help), generate pdf report. Then insert back to oracle as blob.
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Nov 3, 2011
I'm having problems with an Invalid Cast Exception when I try and read a PDF from a database as a BLOB. I am able to write the files into the database no problems at all,however, when I try to retrieve them I just get InvalidCastException.Here is the code I'm using:
Protected Sub btnPDF_Click(sender As Object, e As EventArgs) Handles btnPDF.Click
' Request.QueryString["docid"].ToString();
Dim docuid As String = "b39a443d-ccfd-47f4-b333-f12cd94683d6"
[code].....
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Aug 29, 2010
I have a mySQL table(IMP_SCANS) holding the file, it's name and size for every document:
scan_1 blob
description varchar
filesize int
doc_no varchar
doc_date date
I managed to insert a file to the table. Now I need to save the file to disk.
So I have the code:
Dim conn As New MySqlConnection
Dim cmd As New MySqlCommand
Dim myData As MySqlDataReader
Dim SQL As String
Dim FileSize As UInt32
Dim fs As FileStream
[CODE]............
I all works fine up to the line: myData.GetBytes(myData.GetOrdinal("scan_1"), 0, rawData, 0, filesize) Where it says "Object reference not set to an instance of an object". I cannot figure out why I receive this error.
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