Way To Retrieve Actual Size Of Ntext Column In Native Code?

Aug 3, 2007

Howdy folks! (I feel im creating too many topics...but all my questions are unrelated :-/)

Dev environment: SSCE, Native c++ OLE code, Win CE 5

I have a routine that calculates the size of a set of columns in order to create a byte buffer for retrieving data from an IRowset and inserting it into a custom class. This method works great for all data types except ntext. When I look at the column information from an ntext field, the DBCOLUMNINFO::ulColumnSize member holds 536,870,911 (the max length of an ntext type). Obviously I dont want to allocate 1GB of memory for each ntext column. Is there anyway (natively) to determine the actual number of characters in a field?

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Column Size For Ntext

Aug 11, 2005

Hi,

Please help me to find out the ntext column size in a table.

Thanks in advance

Regards

Karthik

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Hi,

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Does anyone know what the reason for this could be ? And how to clean this up ?

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Hi,
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Jun 21, 2004

Hi Everybody,
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From the EM database properties, the file size shown is not matching with the master..sysaltfiles.size

Ex. Actual file size is 12MB and 1MB for MDF & LDF respectively.
'sysaltfiles' shows 1464 & 96 resp. Since they are shoing it as 8K Pages,
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Thanks
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Aug 16, 2007

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Is there a way or a tool to view that.

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Sql Server has many data types.
For Example:
smallint
Integer data from -2^15 (-32,768) through 2^15 - 1 (32,767). Storage size is 2 bytes.
I want to know that
If it contains like 0 or 100 or 1000 or -200 or -2000  or more or less.
What will its actual size?
2 bytes or change with the value.
Please also mention the reference with your answer. if available.

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Jul 16, 2007

Hi,



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Thanks,



Bryan

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Dec 9, 2003

hi,

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thx
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Jun 26, 2007

I've been searching for a bit but I can't seem to find a difinitive answer.



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Thanks in advance.

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Mar 29, 2006

I couldn't insert more than 4000 charachters in "ntext" type in SQL server. Is there anyway, i can increase the size or any suggestions?

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Feb 26, 2007

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Source: SQL Server 2005
Mobile Edition ADO.NET
Data Provider

This happens only sometimes. If I recreate the command object and executing it again (with the same connection object) no error occurs.

Except for this case the application works fine.



Thanks,

Laschek

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Sep 27, 2006

Hello, everyone.

I have to make a gateway to access third-party closed-source native-code COM objects. As an interface, SQL Server stored procedures are absolutely perfect for my needs. I decided to use SQL Server 2005 CLR rather than using deprecated extended stored procedures or accessing COM objects directly through SQL Server. (This decision is aided by the fact that the third party has plans to make a .NET version of their COM objects "really soon now" (i.e.: not soon enough). Backporting their new interface to my abstraction layer will be very simple.)

I'm having problems using these COM objects from my SQL Server 2005 CLR stored procedure. When I try to run my stored procedure, I get the error below. It appears that SQL Server/CLR refuses to perform the disk access necessary to load the COM object from disk so that it can instantiate it. (My message continues after the error.)

Msg 6522, Level 16, State 1, Procedure MyStoredProcedure, Line 0
A .NET Framework error occurred during execution of user defined routine or aggregate 'MyStoredProcedure':
System.IO.FileLoadException: LoadFrom(), LoadFile(), Load(byte[]) and LoadModule() have been disabled by the host.
System.IO.FileLoadException:
at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, StackCrawlMark& stackMark)
at System.Reflection.Assembly.LoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm)
at System.Activator.CreateComInstanceFrom(String assemblyName, String typeName, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm)
at System.Activator.CreateComInstanceFrom(String assemblyName, String typeName)
at UserDefinedFunctions.MyStoredProcedure()
.

I'll outline the steps I performed so far to get the assembly working:
Ensured I was running at SQL Server 2005 compatibility level. (90)
- Installed and configured the third-party COM objects on my devel box and my DB box. They registered themselves properly.
- Enabled CLR in the DB.
- Made sure the DB owner has UNSAFE ASSEMBLY permission.
- Added the TRUSTWORTHY property to the DB. (Yes, this isn't the "correct" way to do it, but I didn't want to deal with code-signing voodoo. Apologies to actual believers in voodoo.)
- Created an Unsafe assembly "MyAssembly" in SQL Server 2005 and Visual Studio 2005.
- Created all the necessary Interop assemblies (by creating a normal (non-SQL) C# project and building my code, and raiding the bin directory).
- Added these Interop assemblies to SQL Server 2005 as Unsafe assemblies.
- In VS2005, built my SQL Project code and deployed successfully.
- Tried running my stored procedure through a Query window, and I got the error above.

I've done many searches. All of the results I've found concern themselves with Web Services and XML serialization, and suggest using sgen.exe. I don't think they're relevant to my problem. A few said I should add my COM DLLs as assemblies to SQL Server, but that is impossible for native code DLLs. I found something that hinted at tblexp.exe, but I didn't understand how that could help me. I already figured out a way to get me the Interop libs.

Efforts at solving:
- Reading webpages for hours on end.
- I tried using sgen.exe to create the XML serialization assembly, but it didn't help.
- I tried adding various native-code DLLs directly as SQL Server assemblies, but you can bet it didn't like that.
- A few other pitiful attempts not worth mentioning.
- Reading this forum. I didn't see anything that applied.
- Posting here.

I really wish Microsoft had meant what they said when they stated that "Unsafe" assemblies can access anything, instead of trying to protect developers from their folly.

Any insights on getting those COM objects to work in my CLR stored procedure? Thank you.

-Tony Flay

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Jan 22, 2006

I had several databases under sqlserver ce 2.0 (in my Pocket PC) which contained ntext fields. The size of the databases varies from 50,000 to 700,000 records. The size of an ntext field is from 4 bytes to 2 megabytes.

When I recreated my databases under sql server 2005 mobile on my desktop using VS2005 (see my post just under this one), I saw a big difference between the old and new database sizes. This problem was mentioned in one of the posts in this forum and the reply was to replace ntext data with ncharvar type.

Since most of my data was longer than 4000 bytes (which is the limit for nvarchar type), I couldn't use this suggestion. Instead, I changed my ntext type to image type and used a GetByte conversion.

No change! The size of the new database is still 50 % larger than the original. Since the difference is around 300 MB, this is an unacceptable thing.

Now, I either wait from somebody to suggest a new solution (apart from keeping the ntext data in a separate binary file and keep index of the records of this file in the records of sql database) or, most preferably, have

Microsoft solve this problem as soon as possible.

Thanks for any help in advance

Talat

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Jul 12, 2006

Hi,

I experienced this problems on both Windows Mobile 2003 SE and Windows Mobile 5.0.

Its native development (c++, oledb, atl and mfc).



It's quite simple to reproduce...

1. open a database

2. open a rowset on table A (whatever, valid of course and with both IOpenRowset and ICommandText), read datas and close rowset

3. power off

4. power on

5. try step 2 with another table (failed on openrowset with error 0x80004005) or try table A (sometimes working because of cached memory, sometims failed on Read Datas).

6. being stuck ;-)



Our work-around was, in case we loose our connection (identified by error 0x80004005 on openrowset), we close it and re-open database... ugly for sure, but working.



What I'm looking now is to use some kind of "detection method" like what people in .Net develoment are using "if ConnectionState.Open <> ...) for reopening my database only on demand...



Thanks in advance for any hints,
Fabien.

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Jan 29, 2015

Query for output this result on Table C ?

========================================================
I have one table store below information, and other one table is store staff name and phone number. how to display of table c data by new column and using the key staff_code1=staff_id or staff_code2= staff_id or staff_code3=staff_id ?
---------------------------------------------------------

Table A
staff_code1,staff_code2,staff_code3

Table B
staff name
staff_id
staff_phone
-----------------------------------------------

Table C display in new column .
staff name-1 code1 staff name-2 code2 , staff name-3 code3
peter id-01 susuan id-03 david id-05

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Jul 25, 2006

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Thanks!

Henry

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Jul 12, 2004

Hello fellow .net developers,

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Another dropdownlist then will autopopulate itself with the names of all the columns from the table selected in the first dropdownlist.

So, what I need to know is: is there a sql statement that can return this type of information?

Example:

Table Names in Database: Customers, Suppliers

Columns in Customers Table: Name, Phone, Email, Address

I click on the word "Customers" in the first dropdownlist.

I then see the words "Name", "Phone", "Email", "Address" in the second dropdownlist.

I'm sure you all know this (but I'll say it anyways): I could hardcode this stuff in my code behind file, but that would be really annoying and if the table structure changes I would have to revise my code on the webpage. So any ideas on how to do this the right way would be really cool.

Thanks in advance,

Robert

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Mar 14, 2006

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assume i have a query like this.
Select A, B, C from Table1 where ID=xyz
whats the easiest way to get A, B and C in to string variables?
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whats your suggestions?
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Aug 1, 2006

Hi,
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All I've done is:



// and Page Display_image.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
try
{


SqlConnection Con = new SqlConnection(
"server=localhost;" +
"database=;" +
"uid=;" +
"password=;");

System.String SqlCmd = "SELECT img_data FROM Image WHERE business_id = 2";

System.Data.SqlClient.SqlCommand SqlCmdObj = new System.Data.SqlClient.SqlCommand(SqlCmd, Con);

Con.Open();

System.Data.SqlClient.SqlDataReader SqlReader = SqlCmdObj.ExecuteReader(CommandBehavior.CloseConnection);

SqlReader.Read();

System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";

// I write this:
System.Web.HttpContext.Current.Response.BinaryWrite((byte[])SqlReader["img_data"]);

// Or this:
//System.Drawing.Image _image = System.Drawing.Image.FromStream(new System.IO.MemoryStream((byte[])SqlReader["img_data"]));

//System.Drawing.Image _newimage = _image.GetThumbnailImage(100, 100, null, new System.IntPtr());

//_newimage.Save(System.Web.HttpContext.Current.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);


Con.Close();

}
catch (System.Exception Ex)
{

System.Web.HttpContext.Current.Trace.Write(Ex.Message.ToString());
}
}

Both work the same way. I mean the image is displayed well but when I view code of the web page I see this:

....
GIF89aåo÷óå݉97)HS¢Å’xL£0¬B´ç¬D(áâK‹†ô²–I€8`È®û l1ãÂ?#KžL(ˆ*X±â€°Î"«M豆Ÿ
....

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Can anyone help me with this? I've tried for 2 days but I still fail.

Thanks.

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Nov 20, 2006

Hello again!

I got a problem using an OLE-DB Source in my data flow task. It is an Informix-Server using the newest OLE DB-Driver provided by IBM. However, when I set up the OLE DB-Source with connection manager and SQl-Query, I get the following warning message:

Warning at {2B334CA3-A792-4BC2-93AA-12FADCF1E696} [OLE DB Source [45]]: Cannot retrieve the column code page info from the OLE DB provider.  If the component supports the "DefaultCodePage" property, the code page from that property will be used.  Change the value of the property if the current string code page values are incorrect.  If the component does not support the property, the code page from the component's locale ID will be used.


Later when I try to execute the package, the destination adapter gets errors like

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I guess that SQL Server cannot get the data types from the Source.

Has anyone an idea? Thanks in advance!

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Aug 25, 2006

Hi All,

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CREATE proc SProc_DeleteRecord
@TableName varchar(50),
@DeleteCondition nVarchar(200)
As
Begin
Begin Transaction
Declare @DelString nvarchar(4000)
set @DelString = 'Delete from ' + @TableName + ' where ' + @DeleteCondition
execute sp_executeSql @DelString
RollBack Transaction --because i donot want to delete the record in any case
If @@Error <> 0
Begin
select '1'
End
Else
Begin
Declare @SQLString nvarchar(4000)
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execute sp_executeSql @SQLString
select '0'
End

End

Thanks & Regards

Bijay

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Feb 27, 2004

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Mar 14, 2008



Hi,

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"Microsoft.SqlServer.Dts.Pipeline.BlobColumn"

I am trying to get the string value from this blob column. For that I am using the below code. Can you please point me to where I am going wrong. I am not very good in VB so I might be doing some casting error.

Dim blobCol As Microsoft.SqlServer.Dts.Pipeline.BlobColumn

Dim ByteVal As String


For Each column In Me.ComponentMetaData.InputCollection(0).InputColumnCollection


columnValue = rowType.GetProperty(column.Name)

Select Case column.DataType

Case (DataType.DT_NTEXT)


blobCol = DirectCast(columnValue.GetValue(Row, Nothing), Microsoft.SqlServer.Dts.Pipeline.BlobColumn)

ByteVal = System.Text.Encoding.Unicode.GetString(blobCol.GetBlobData(0, CInt(blobCol.Length)))

newXML += ((FormatElement(column.Name) + ReplaceSpecialChars(ByteVal) + FormatElement(column.Name, True)))

Case Else


newXML += ((FormatElement(column.Name) + ReplaceSpecialChars(columnValue.GetValue(Row, Nothing).ToString()) + FormatElement(column.Name, True)))

End Select

Next

Thanks in advance.
Regards

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Nov 30, 2007

Hi,
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I would be glad if anyone can give me any advise on why such problem popped out and especially on the column-level in SQL CE?? And how to overcome it?

Thanks for your time and effort,

Looking forward to hear from as soon as possible...


Just for Clarification:
.NET CF 1.0 SP3

SQLCE 2.0
were used

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Jan 16, 2007

Hi,
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###### admin: Jan 8, 2007 3:53:57 PM GMT Type: Inactive (Key 10) Description: Activity yet to be started State: Planned "

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Sep 19, 2007

Hi,

I have a table column type as nText, however there are some Chinese character stored in that field and it is a messed up as it is not readable.

In my vb.net code, I did Convert to unicode by getting the byte of each character and encode it with UTF8 e.g:


Public Shared Function ConvertToUnicode(ByVal s As String) As String


' Convert To Unicode

Dim MyBytes As Byte() = Encoding.Default.GetBytes(s)

Dim GBencoding As Encoding = System.Text.UTF8Encoding.UTF8

Return GBencoding.GetString(MyBytes)

End Function


This works well but ,the problem is that it slows down the process quite alot, and I wonder are there any text encoding method I can use in SQL that can run when i do the SELECT Statement?


SELECT
Convert(MyNTEXTColumn)
....
something like that?

Thanks.
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