Read Write Image Data With Sqlceserver

Oct 19, 2006

I was wondering if it is possible to read image data from a database in .net compact framework. Since cf does not have image.fromstream(memstream) to work with, I don't know how else to read the image from the database and then place it into a picturebox.

Here is the code I have been trying out:

Dim Img As Image
'
Dim conn As New SqlCeConnection("Data Source = My Documents est2.sdf")


conn.Open()

Dim sql As String = "SELECT * FROM Dater"
Dim cmd As New SqlCeCommand(sql, conn)
Dim reader As SqlCeDataReader = _
cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)

While reader.Read()

TextBox1.Text = reader.Item("name")
Dim b(reader.GetBytes(1, 0, Nothing, 0, Integer.MaxValue) - 1) As Byte

reader.GetBytes(1, 0, b, 0, b.Length)
Dim ms As New System.IO.MemoryStream(b)
Dim bmp As New Bitmap(ms) <-Error: Value does not fall within expected range
Img = bmp

End While

PictureBox2.Image = Img



I get an error ,Value does not fall within expected range.

Does this mean the image was not save correctly in the database?

Thanks for any help

View 1 Replies


ADVERTISEMENT

Read Image Data From SQL Server

Sep 19, 2007

Here is my task  I am storing pdf's in sql server. I would like to retrieve the binary data from sql server and write the pdf content into an existing aspx page to the appropriate pageview section.  What is the best way to handle this.  The code works below but it loads a new browser with the content.  I need it to appear in it's tabbed section in the original aspx file.  Any assistance you can give me would be greatly appreciated.
 Thanks Jerry
oSQLConn.Open()Dim myreader As SqlDataReader
myreader = myCommand.ExecuteReader
Response.Expires = 0
Response.Buffer = True
Response.Clear()
Do While (myreader.Read())
Response.ContentType = ("application/pdf")Response.BinaryWrite(myreader.Item("img_content"))
Loop

View 5 Replies View Related

How Can I Read From Image Data Type

May 11, 2001

I want to store my MS-Word documents and Excel sheets in the database. So, i have used
the image datatype. Iam not able to download the documents from the database.
i have used getBytes() method. But when i try to download excel sheet document, i get
a error message saying, "File error: data may have been lost".
Can i get some help. can u say how can i put word and excel docs in the database and
retrieve it.
regards,
sathish

View 2 Replies View Related

Image Data Read From SQL Server Does Not Show Up

Mar 4, 2004

Hi Guys,

I've been strugling with this problem all morning today.

Basically I store images in SQL Server 2000 database and then whould like to show them with

<img src="viewImage.aspx?image_id=10" border=1>


My table structure is setup this way

TABLE [userImages] (
[imageFilename] [nvarchar] (128) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[imageContentType] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[imageFileSize] [bigint] NULL ,
[imageFileImage] [image] NULL )


and in viewImage.aspx I have:

if (dr.Read())
{

Response.ContentType = dr.GetString(dr.GetOrdinal("imageContentType"));
Response.BinaryWrite( (byte[]) dr["imageFileImage"] );
}


I have no prolems retrieving the data from DB. But the image does not display(in IE it shows a broken link image)

What's even more puzzling is I CAN display the same image from HDD like so:

FileStream fs = File.OpenRead("D:\my_image.png");
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();

Response.ContentType = "application/octet-stream";
Response.BinaryWrite(buffer);


Am I missing something very obvious. I tried playing around with different ContentType's same result.

In my case I am forced to store images in the DB.

I've seen other examples on the net and theirs work. Please help.

Sincerely,
Vlad Orlovsky

View 1 Replies View Related

SQL Server 2005 Unable To Read Image Data

Nov 27, 2006

This just happened today and I dont know why.  I have a database on a SQL server 2005 database, that has a table called photos.  It contains image data, but not the column says <Unable to read data>.  But before that I get an error when I try to execute the table to retreive the data.  The error is below. SQL Execution Error:Executed SQL statement: SELECT ID, AlbumID, Caption, BytesOriginal, BytesFull, BytesThumb FROM PhotosError Source: System.DataError Message: Invalid attempt to Read when reader is closed. This happens with SQL Server Management Studio, and Visual Studio 2005 when I try to access it.  I tried two computers so its not that.  Any help or insight would be appreciated. 

View 2 Replies View Related

Data Read / Write Problem With Concurrent Users On With Dll

Feb 6, 2007

Hi,I have a web app, that runs fine, except for one particular section that uses a class called by an event in the code behind. The class resides as a dll in the bin folder. We had no problems during testing, when only one user was running this dll. Problems soon occurred when multiple users tried running it. Here's the error & stack: 06/02/2007 09:25:26 ==> cburns ==> There is already an open DataReader associated with this Command which must be closed first.   at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)   at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)   at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)   at System.Data.SqlClient.SqlCommand.ExecuteReader()   at ESP.Validator.Data.DatabaseEvents.DatabaseEventManager.Read(IEventable eventObject, Int16 eventType, DateTime earliestDate, DateTime latestDate) in C:My PathValidatorValidator.NETDataDatabaseEventsDatabaseEventManager.cs:line 92   at ESP.Validator.Data.Translink.CATCard.GetDespatchDate() in C:My PathProjectsValidatorValidator.NETDataTranslinkCATCard.cs:line 94   at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.ReadCards() in C:My PathProjectsValidatorValidator.NETDataTranslinkExistingSchemeEntitlement.cs:line 215   at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkExistingSchemeEntitlement.cs:line 147   at ESP.Validator.Data.Translink.TranslinkApplicant.ReadEntitlements() in C:My PathProjectsValidatorValidator.NETDataTranslinkTranslinkApplicant.cs:line 369   at ESP.Validator.Data.Translink.TranslinkApplicant.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkTranslinkApplicant.cs:line 353   at ESP.Validator.Data.Translink.PrePrintedLetter.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkPrePrintedLetter.cs:line 282   at ESP.Validator.ValidationProcessor.Read(ValidationSubject subject) in C:My PathProjectsValidatorValidator.NETValidationProcessor.cs:line 82   at clear_applications_scan_applications.ProcessValidation() It seems the data reader is getting reused. We have ensured after each read the reader is closed. Though all users are using the same connection string. Could it be a connection pool problem, with the connection being overwritten during execution? Should i edit it according to the users logon?I am really at a loss for ideas, and I don't mind admitting I am a bit out of my depth with this one!! Any ideas/suggestions would be greatly appreciated. Thanks 

View 1 Replies View Related

Is Ssis The Only Technology That Can Read/write Raw Data Type Files?

Sep 21, 2007

I'm contemplating a sql server archive strategy that rolls really old data off any sort of dbms and onto low cost media like dvds in a non relational archive format. I dont want to ever worry about these archives spanning different versions of sql when i go to retrieve a range of data that happens to span sql versions (eg one disc was sourced from 2005 another by 2008 but my report needs a union of both).

So I'm thinking about neutral/efficient formats for these archives and a live homegrown catalog that can determine exactly what disc(s) need to be mounted based on passed from and to date parameters...all so that the data that might span discs (and versions and maybe even schemas) can be merged and loaded into my sql version d'jour's "throw away" archive database for a one time report or other unplanned activity.

I remember raw data types being very convenient as an ETL format for our customers who have ssis, but wouldn't want our sqlexpress customers to be left without the archiving capability. Do the "things" that read and write raw data files really originate in some special T-SQL command that all sql editions can use, or is it strictly an ssis thing?

View 4 Replies View Related

Foreach Loop Read Table Data And Write To File

Sep 21, 2007

Hi,

I want to do the following with a ssis package:

INPUT:
A table contains 2 columns with data i need. column A=Filename and column B=FileContent

PROCESS:
I need to loop through ea record in the table and retrieve columns A and B. Then for ea column i need to write the Content hold in column B into File hold in column A.

I so far found out, that i need a Execute SQL Task in Control Flow querying the table and get columns A and B into 2 variables, plus a 3rd var holding the object. Then the output goes into a Foreach Loop Container. From this point i don't know how to continue. I tried to put a Data Flow Task inside the Foreach Loop, but couldn't find out how i now get the 2 variables to the Data Flow Task and use them to for the file to be written and the content to be placed in the file.

Is there any example similiar to that so i could learn how to start on that?

Thanks
Danny

View 3 Replies View Related

Transact SQL :: Making Server Database Read / Write From Read Only

Jan 12, 2012

i attached adventure works in sql server 2008 and it showing as read only ,make it read write or remove read only tag from database.

View 11 Replies View Related

SQL 2012 :: Identify Whether Files Are In Read / Write Or Read Only

Mar 24, 2015

How to identify whether the files are in read write or read only?

View 1 Replies View Related

Recovery :: Switch (Standby / Read-Only) DB To Be Read And Write

Aug 26, 2015

I'm trying to do Sharepoint DR with Log Shipping and every thing configured except one thing which is switch the WSS_Content (Standby /Read-Only) DB to be ready and Write. 

I tried from

GUI or ALTER DATABASE [WSS_Content] SET
READ_WRITE WITH NO_WAIT

but I received the below error: 

Database WSS_Content is in Warm Standby 

View 9 Replies View Related

Reset Database Files From Read-only To Read-write

Jan 18, 2008

I have two database files, one .mdf and one .ndf. The creator of these files has marked them readonly. I want to "attach" these files to a new database, but cannot do so because they are read-only. I get this message:

Server: Msg 3415, Level 16, State 2, Line 1
Database 'TestSprintLD2' is read-only or has read-only files and must be made writable before it can be upgraded.

What command(s) are needed to make these files read_write?

thanks

View 7 Replies View Related

SQL 2012 :: Change Read-only And Read-write

Aug 15, 2014

Can a user of db owner role of a database change the databse option to read only and read-write?If not what permission I need to grant to the user?

View 1 Replies View Related

XML Read And Write

Apr 4, 2004

Pls help guys

I need to know whether its possible to read or write in to XML documents from SQLServer directly using stored procedures.

I basically need to created a number of XML documents on a nightly basis.,..........also i need to read a no of XML docs to SQLServer...

Is it wise to use stored procedures for this?
Or are there performance issues.........and do u suggest doing in in .NET


Your comments are appreciated..

Regards

Benny

View 5 Replies View Related

Different Cpu Read Write

Apr 15, 2008



I have a query that runs for 10 sec on one database( A) and 5 min on another database(B) even though two database have identical scheam, tables, index and statistics..


I ran a profiler and got the below information
CPU READ Write
Database A: 92051 711956 8774
Database B: 91812 7621589 315822


A query runs on database has a significant larger read and write.. I don;t understand why this is happening? even though these two database have the same structure?? it has the same execution plan as well..


How can i solve this issue?

View 14 Replies View Related

DB2 Write Image To Blob Field

Dec 29, 2006

I need some help in SSIS Package I am trying to write a byte array to an image (blob) in DB2 destination. I am getting SQL code -290 Invalid Description, if i set the output column to a byte stream. If I set the output column to an Image data type then I get a different error the package will not at that time even process it errors out right away. At least using a byte stream datatype it errors out when it is about to write to the olebd destination. Anybody have success using BLOB fields in SSIS package data flow? Thanks for any help.

View 5 Replies View Related

Read Image From Sql Server

Aug 6, 2007

Hello!

My real problem is that i want to read an image from an Sql Server DB, resize them and send them, all this through a Web Service. I decide to split my problem in four steps:

1 - read image from Database
2 - Resize that image
3 - Send her back to the DB
4 - Send the image throw a web service after he use a dataset to read the data from the DB.

i try to read the database with this function




Code Snippet
public System.Drawing.Image ReadImgFromDB(Int64 imageID)
{
System.Drawing.Image image = null;
using (SqlConnection conn = new SqlConnection())
{
string connString = WebConfigurationManager.ConnectionStrings
["StringCC"].ConnectionString;
conn.ConnectionString = connString;
SqlCommand myCommand = new SqlCommand(
"SELECT Pic FROM Images WHERE ID='"+ imageID +"'", conn);
conn.Open();

byte[] imageData = (byte[])myCommand.ExecuteScalar();
System.IO.MemoryStream memStream = new System.IO.MemoryStream(imageData);
image = System.Drawing.Image.FromStream(memStream);
}
return image;
}





i introduce a valid image ID and i get this message

--- " System.ArgumentException: Parameter is not valid.
at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)
at System.Drawing.Image.FromStream(Stream stream)
at Service.ReadImgFromDB(Int64 chaveI) in e:Web ProjectsWSserviceApp_CodeService.cs:line 48"-----


line 48: "image = System.Drawing.Image.FromStream(memStream);"


Thank you!





View 3 Replies View Related

Read/Write To Same Table

Oct 17, 2001

Hi, we're trying to read from a table and write back to the same table and are having a lot of trouble with blocking. What could we do to prevent our application from hanging due to blocking of this type?

View 1 Replies View Related

Write In And Read From My_File.txt

May 31, 2004

Hi ..
I want to Write in files or read from files
for example i have My_File.txt . i need a syntax and i want to call this syntax in my Store procedure and this syntax write forexample " Hello Word " in My_File.txt .
and i want another syntax that read from My_File.txt forexample "Word" from My_File.txt . what are those syntaxes do that ??

thanks

View 1 Replies View Related

Read/Write Performance

Apr 21, 2006

Hello,

We currently run sql 2005 server and also sql express in our dev environments. We use sql express as an offline store (smart client). We have a similar/exact schema on the sql 2005 server and also the express.

We use the auto attach feature to connect to the express version of the database. Both the developer machines and the one that is running the sql 2005 server have exactly the same hardware configuration. The only difference may be that the server box is not running the VS.Net environment. The disk space etc is pretty much the same. Actually we run another database server(DB2) on the 2005 server machine.

We have observed that sql express is much slower and queries execute much slower aswell. For example, this may not be a totally scientific way of checking but a long running query on the server took only 2 minutes while on express it took longer than 9 minutes. The schema and data etc are the same.

Is there something we need to look into as far as read write speed/performance goes ?

TIA,

Avinash

View 6 Replies View Related

Read/Write For Variables

Aug 3, 2007

Hi,

I am using a Script Component and I have a Read/Write Variable varStatusCase (as assigned in the Custom Properties of my Script Component). I used this inside my script to get a specific value. However, when I ran it I get this error:

The collection of variables locked for read and write access is not available outside of PostExecute.

How do I repair this?

Thanks,

cherriesh

View 6 Replies View Related

Read And Write A Constraint Or Default Value

Nov 20, 2007

Okay, maybe I'm getting ahead of myself.
Using SQL Server Express, VWD and .net 2.0 I've figured out how to drop a Table Column Constraint or Default Value/Binding and then Create it again using a stored procedure. What I can't figure out is how to retrieve that column's constraint value and write it to, say a label, in an aspx page, simply for reference. Is it possible? In this case the Data Type of the column is money.
I'm using it to perform a calculation to a column with a value that the user inserts into another column. (Column1(user input) minus Column2(with Default Value) = Column3(Difference). I just want to read Column2's Default Value for reference so I know whether to change it or not.

View 6 Replies View Related

Denormalization, 2 Databases , 1 Read 1 Write Db

May 28, 2008

Hi,
I was reading that many of these high traffic websites actually have 2 databases, 1 database is used ONLY for reads, while the other is for writes.

How does one go about creating such a setup? How does the database where writes are allowed replicated the data to the read only database server?

View 1 Replies View Related

Implementing Read-write Locks

Jul 23, 2005

Hi,I would like to use database locking mechanism to control access to anexternal resource (like file system).What I need is1. an exclusive (write) lock conflicting with any access to theresource (both for read and write)2. non-exlusive (read) lock conflicting with writes onlyHow this could be done?I'd appreciate any reply.Vadim

View 1 Replies View Related

Read/Write Operation On SQLCE 3.0 Using VC++

Jan 29, 2008

Dear All,

I am looking for a sample code to do read/write operation on SQLCE 3.0 using VC++. For SQLCE 2.0 I have used ATL Consumer template and works well.

Thanks in Advance.

Param

View 3 Replies View Related

Use Variables As A Storage [read/write] ?

Aug 2, 2007

Hello Guys,
in SSIS I want to get a set of data and do some modifications on it before I insert it into the destinatipn. So far so good. Some of the modifications will include comparisions between two columns and if certain field is NULL then I want to get the value from the other one I was comparing to. When using conditional splits, I only get the rows to be redirected so that I can do whatever next. However, I want like use the variables as a storage so that I can put the value of one of the two columns in this variable which will be actually loaded into the destination finally. Any help?
Thanks

View 1 Replies View Related

Read / Write Into .doc From SQL Stored Procedure

Jun 25, 2007

I need to create a flat file as word document, may i know how to write text from stored procedure if a file is already exist then the text will append, how to do it ?



Thank you.

View 1 Replies View Related

Password To Read/write My Query

Feb 6, 2008

I use excel as an interface to write query to retrieve data from a database in network drive. My problem is everyone can open and edit my query. Of course, the univeral database access user name and password will ask but everyone know this.
How can I put password to prevent any query modification?

Thanks
Daniel

View 1 Replies View Related

Last Read/write Time Of Table

Jul 14, 2007

Is there a way to get the last read/write time of a table?

I want to have a few tables, but only allow them to exist if they have been used in the last 30 days. I want to set up a "purge" job to clear out any tables that have not been used in 30 days.

View 4 Replies View Related

How Can I Read An Image Which Is In The MSSQL Server Database?

Aug 23, 2005

How can I read an Image which is in the MSSQL Server database?

View 2 Replies View Related

Stored Procedure To Read And Write Between XML And SQLServer

Mar 28, 2004

Hi All,
I need some help from you experts.

I need to develop something that reads from xml files and writes in to sqlserver, also it should read from SQLServer and writes to xml.

I should be able to give this as a job to exectue daily ,etc.

Can we do this using stored procedures in SQLServer.
Pls paste some sample code, if any or direct me to any url with better info.

Thanks in advance

View 11 Replies View Related

Does Cursor Convert Table To Read/write?

Apr 10, 2008

Hello,

Any help here much appreciated.

I am using sql server 2000 to perform address cleansing. there is a point in my scripting when a table i pass values to becomes read/write.

i suspect this is when i run a cursor through the table.

Is anyone able to confirm for me whether running a cursor changes a table's properties?

Many thanks.

Tim

Ps as the table seems to be read/write it is harder to tell if NULLs are in the table and this is messing with joins I have further down the track.

View 3 Replies View Related

Read Write Same Variable In Script Task

Nov 1, 2007

I want to write a variable say testVar in PostExecute of my script. I also want to read the same variable at the start of my script block.

How to specify this variable in the script transformation editor

ReadOnlyVariables = ????
WriteOnlyVariables = ???

If i just define

WriteOnlyVariables = testVar

will it work . I mean i cannot use testVar in both read & write


Any suggestions...


Thanks

View 3 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved