Trying To Map To Tinyint - Single Byte Unsigned Int Not Working
Mar 11, 2008
I have an Excel spreadsheet that I eventually land into my staging table. In between, I'm attempting to get a date code from the Date table. I'm using a Lookup Transformation Editor and mapping the fiscal week of year and fiscal year name. I know the fiscal year name is fine. When I have both the fiscal year name and the fiscal week of year, the package fails on the lookup step. In a data conversion, I convert the fiscal week of year to a single byte unsigned integer. (In the Date table, the fiscal week of year is a tinyint.) I'm not sure what I'm doing wrong?
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Oct 9, 2007
if single byte characters are stored, does it take up two bytes in the database anyway, or does it only take up one byte?
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Mar 26, 2008
hi
i am getting an error with my code, it says 'value of type byte canot be converted to 1 dimensional array of byte' do you know why and how i can correct this error, the follwoing is my code.
can anyone help me correct the error and let me know ow to solve it
thanks for any help givenPublic Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequestDim myConnection As New Data.SqlClient.SqlConnection("ConnectionString")
myConnection.Open()
Dim sql As String = "Select Image_Content from ImageGallery where Img_Id=@ImageId"Dim cmd As New Data.SqlClient.SqlCommand(sql, myConnection)cmd.Parameters.Add("@imgID", Data.SqlDbType.Int).Value = context.Request.QueryString("id")
cmd.Prepare()Dim dr As Data.SqlClient.SqlDataReader = cmd.ExecuteReader()
dr.Read()
context.Response.ContentType = dr("imgType").ToString()context.Response.BinaryWrite(CByte(dr("imgData"))) ----- this is the line with the error
End Sub
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Aug 23, 2006
Hi, I have a problem importing data from SQL Server 2000 'text' columns to SQL Server 2005 nvarchar(max) columns. I get the following error when encountering a transfer of any column that matches the above.
The error is copied below,
Any help on this greatly appreciated...
ERROR : errorCode=-1071636471 description=An OLE DB error has occurred. Error code: 0x80004005.An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Unicode data is odd byte size for column 3. Should be even byte size.". helpFile=dtsmsg.rll helpContext=0 idofInterfaceWithError={8BDFE893-E9D8-4D23-9739-DA807BCDC2AC} (Microsoft.SqlServer.DtsTransferProvider)
Many thanks
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May 20, 2008
I have a table with a single effective date, rather than both a start and stop date. I have to be able to match up this table to another one with service information in it and am not sure how to get the correct record selected.
So in table one I have a personID, effective date, and lots of other fields. There are also multiple records for each personID, so say personID 1 has records with effective dates of 1/1/2007, 6/1/2007, and 1/1/2008.
Table two has personID, Service Date, and lots of other fields.
So if I am looking to match up the effective row from table one to a record in table two with a service date of 8/1/2007, how do I get the db to locate and return the record with an effective date of 6/1/2007, and only this record?
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Mar 7, 2006
I need to compute a BIGINT value in a SPROC that I'm writing. An intermediate value of the calculation is an unsigned value greater than (2^63-1) which I gather is why my SPROC is producing an arithmetic overflow error. I have a couple of choices as I see it:
1. Change the algorithm so that I don't have such large intermediate values (which would require me to add conditional statement which would slow down the SPROC and, therefore, I don't want to do).
2. Use the CLR integration with SQL feature to write my SPROC in C#.
My question is: Will 2. work or will the C# SPROC also produce an overflow once it is executed by the SQL Server?
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Jul 26, 1999
What is the equivalent for Unsigned int datatype in SQL 7?
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Jan 17, 2005
In MySQL you can define a unsigned integer as uint
But MS don't allow this. Only as int.
How can I define a column/field as a unsigned int ?
CREATE TABLE StringTable (
NDX uint IDENTITY(1,1),
MID varchar(81),
TableTXT varchar(65),
TableNDX uint,
TXT1 varchar(129),
TXT2 varchar(129),
UNCDateTime datetime,
Data image)
-1 42000 2715 [Microsoft][ODBC SQL Server Driver][SQL Server]Column or
parameter #1: Cannot find data type uint.
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Apr 17, 2005
I have an SP that returns a result set that contains a tinyint. My problem is that, when I try and access this value using GetInt16 (or 32), I get an error saying that "Specified cast is not valid". TinyInt is 1 byte, or 8 bits. GetInt16 'Gets the value of the specified column as a 16-bit unsigned integer'. I am assuming that this is the root cause of my problem. But, there doesn't seem to be a GetInt8 ?! Any ideas?
Thanks, Martin
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Oct 4, 2006
The documentation seems to suggest that I can store either a signed or unsigned value in bigint. If I want to store an unsigned value how do I go about it?
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Aug 6, 2007
How can I set an attribute of unsigned zerofill in SQL? Like for example, there is an option in MySQL phpmyadmin to set the attribute of a specific column to unsigned zerofill, it will be based on the length of the integer. For example, the lenght of my int is 5, so if i'll set the attribute of the column to unsigned zerofill, the value that will be auto incremented will have zeroes before that actual value, for example000010000200003....00010and so on and so forth...But, how can i do this in SQL? I'm using MS SQL Server Management Studio Express, but I can't find the field attributes to set it to unsigned zerofill.. I hope somebody will reply in this post.. :(
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Jan 16, 2006
I encounter the following error :
Server: Msg 8115, Level 16, State 2, Procedure kssp_UpdateLeague, Line 107
Arithmetic overflow error converting expression to data type tinyint.
When I hit the following code:
SET @A = @B - @C
-------------------------------------------
@A is defined as :
DECLARE @A INT
@B and @C are populated in a fetch :
FETCH NEXT FROM FixtureList INTO @B, @C
and FixtureList is defined as :
DECLARE FixtureList CURSOR FOR
SELECT HomeScore, AwayScore FROM fixtures
WHERE homescore IS NOT NULL AND awayscore IS NOT NULL
The fields HomeScore and AwayScore are defined as Tinyint
@B and @C are typically between 0 and 10. I reckon the problem may be with the precision of the data types but I don't know how to prove this or how to fix. I've tried various combinations of convert and cast at various points in the expression (SET @A = @B - @C) but to no avail.
Interestingly (or not) if I run the following select I get the same error :
SELECT DATE01, HOMESCORE, AWAYSCORE, HOMESCORE - AWAYSCORE FROM fixtures
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Aug 1, 2004
I need to stored lots of unsigned 32-bit values. (I'm actually storing IPv4 addresses). These values will frequently exceed 2^31 but never exceed 2^32
My options are:
Use bigint. This is undesirable since this wastes 32-bits of space for every value.
Use int and use the negative value range to get full 32-bits worth of data. In C, it is easy and fast to cast a signed -1 to an unsigned 2^32-1. In SQL, it will be more expensive: Must cast to 64-bit and if val < 0 then val = 2^32 + val.
Is there a better alternative?
Is there a fast (binary) way to cast a value > 2^31 to a negative signed value?
DECLARE @value BIGINT
SET @value = 3000000000
SELECT CONVERT(INT, @value) -- causes error
SELECT CAST(@value AS INT) -- causes error
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Jan 10, 2008
Hi all,
I found a UDF on the web to validate INT data contained in a VARCHAR field:
http://blog.sqlauthority.com/2007/08/11/sql-server-udf-validate-integer-function/
I modified it to accept NULL values and conform more closely to INT specification. Here is my modified function:
CREATE FUNCTION [dbo].[udfIsValidINT]
(
@Number VARCHAR(100)
)
RETURNS BIT
BEGIN
DECLARE @Ret BIT, @ShiftByOne INT;
IF LEFT(@Number, 1) = '-'
SELECT @Number = SUBSTRING(@Number, 2, LEN(@Number)), @ShiftByOne=1;
SELECT @Number = COALESCE(@Number,'0'), @ShiftByOne = COALESCE(@ShiftByOne,0)
IF (PATINDEX('%[^0-9-]%', @Number) = 0
AND CHARINDEX('-', @Number) <= 1
AND @Number NOT IN ('.', '-', '+', '^')
AND LEN(@Number)>0
AND LEN(@Number)<11
AND @Number NOT LIKE '%-%')
SELECT @Ret = CASE WHEN CONVERT(BIGINT,@Number) - @ShiftByOne <= 2147483647
THEN 1 ELSE 0 END
ELSE
SET @Ret = 0
RETURN @Ret
END
GO
SELECT dbo.udfIsValidINT('2147483648')
SELECT dbo.udfIsValidINT('2147483647')
SELECT dbo.udfIsValidINT('-200')
SELECT dbo.udfIsValidINT('-2147483649')
SELECT dbo.udfIsValidINT('32900')
SELECT dbo.udfIsValidINT('1.79E+308')
GO
I also have a separate function for SMALLINT:
CREATE FUNCTION [dbo].[udfIsValidSMALLINT]
(
@Number VARCHAR(100)
)
RETURNS BIT
BEGIN
DECLARE @Ret BIT, @ShiftByOne INT;
IF LEFT(@Number, 1) = '-'
SELECT @Number = SUBSTRING(@Number, 2, LEN(@Number)), @ShiftByOne=1;
SELECT @Number = COALESCE(@Number,'0'), @ShiftByOne = COALESCE(@ShiftByOne,0)
IF (PATINDEX('%[^0-9-]%', @Number) = 0
AND CHARINDEX('-', @Number) <= 1
AND @Number NOT IN ('.', '-', '+', '^')
AND LEN(@Number)>0
AND LEN(@Number)<6
AND @Number NOT LIKE '%-%')
SELECT @Ret = CASE WHEN CONVERT(INT,@Number) - @ShiftByOne <= 32677 THEN 1 ELSE 0 END
ELSE
SET @Ret = 0
RETURN @Ret
END
GO
SELECT dbo.udfIsValidSMALLINT('589')
SELECT dbo.udfIsValidSMALLINT('-200')
SELECT dbo.udfIsValidSMALLINT('-32900')
SELECT dbo.udfIsValidSMALLINT('32900')
SELECT dbo.udfIsValidSMALLINT('1.79E+308')
and one for TINYINT:
CREATE FUNCTION [dbo].[udfIsValidTINYINT]
(
@Number VARCHAR(100)
)
RETURNS BIT
BEGIN
DECLARE @Ret BIT, @L TINYINT;
SET @L = LEN(@Number);
SET @Number = COALESCE(@Number,'0');
IF (PATINDEX('%[^0-9]%', @Number) = 0
AND @L>0
AND @L<4)
SELECT @Ret = CASE WHEN CONVERT(SMALLINT,@Number) < 256 THEN 1 ELSE 0 END
ELSE
SET @Ret = 0
RETURN @Ret
END
GO
SELECT dbo.udfIsValidTINYINT('256')
SELECT dbo.udfIsValidTINYINT('-1')
SELECT dbo.udfIsValidTINYINT('0')
SELECT dbo.udfIsValidTINYINT('255')
SELECT dbo.udfIsValidTINYINT('1.79E+308')
And, finally, a separate function for DECIMAL validation:
CREATE FUNCTION [dbo].[udfIsValidDECIMAL]
(
@Number VARCHAR(100),
@Scale TINYINT,
@Precision TINYINT
)
RETURNS BIT
BEGIN
DECLARE @Ret BIT, @L TINYINT, @DSI TINYINT;
SET @Number = COALESCE(@Number,'0');
IF LEFT(@Number, 1) = '-'
SELECT@Number = SUBSTRING(@Number, 2, LEN(@Number));
SET @L = LEN(@Number);
SET @DSI = @L - LEN(REPLACE(@Number,'.',''))
IF(
PATINDEX('%[^0-9.]%', @Number) = 0
ANDCHARINDEX('-', @Number) = 0
AND@DSI <= 1
AND@L>0
AND@L<=@Scale+@DSI+ CASE @DSI WHEN 1 THEN @L-CHARINDEX('.', @Number) ELSE 0 END
AND @Scale - @Precision >= CASE @DSI WHEN 1 THEN CHARINDEX('.', @Number) - 1 ELSE @L END
)
SELECT @Ret = 1
ELSE
SET @Ret = 0
RETURN @Ret
END
GO
SELECT dbo.udfIsValidDECIMAL('256',2,0)
SELECT dbo.udfIsValidDECIMAL('-1',1,0)
SELECT dbo.udfIsValidDECIMAL('10.123456789123456789',18,17)
SELECT dbo.udfIsValidDECIMAL('10.123456789123456789',18,16)
SELECT dbo.udfIsValidDECIMAL('-255.0000000000000001',3,0)
SELECT dbo.udfIsValidDECIMAL('1.79E+308',9,2)
Node that the DECIMAL validation function specifically tests whether the input number can legally convert to a given decimal scale and precision. Converting a value of 0.234234 over to DECIMAL(1,0) will work, but SQL will truncate the actual decimals to fit it in that space. However, it will throw an error if you have too many whole digits.
On the whole, I was rather rushed to get these created, so there may be some errors I didn't notice. I'm interested in any improvements you guys can make to improve performance or make them cleaner.
Thanks for looking!
- Shane
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Oct 17, 2014
I've got a sp that goes well. Except for the tinyint value, that doesn't update in the table.
ALTER PROCEDURE[dbo].[spTelling]
(
@ScanNummer NVARCHAR(13),
@Basis tinyint,
@CurrentTal INT OUT
)
[Code] ...
The insert statement works. But I want also to update Basis (tinyint) in the table Telling.
WHENMATCHED
THENUPDATE
SETtgt.Tal += src.Tal
Where must I write
set basis = @Basis
if you do not try, it will not work....
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Dec 15, 2005
If I have an executesql task that returns a result set, if the result set contains a tinyint, I can't find what SSIS data type to declare the variable as. They all cause errors.
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Feb 3, 2008
Hi people,I have a little problem with this!There are some variables in C# code: int personID = 10;
string personName = "Tom";
System.IO.BinaryReader reader = new System.IO.BinaryReader(FileUploadPersonPhoto.PostedFile.InputStream);
byte[] personPhoto = reader.ReadBytes(FileUploadPersonPhoto.PostedFile.ContentLength); After that, there is a SQL query: string query = "INSERT INTO PersonTable (PersonID, PersonName, PersonPhoto) VALUES ("
+ personID + ", '" + personName + "', " + personPhoto + ")"; In Debug mode, value of the query is "INSERT INTO PersonTable (PersonID, PersonName, PersonPhoto) VALUES (10, 'Tom', System.Byte[])" and it does not work! Is there any prefix or something else that I should put and make it work?Thank you in advance!P.S. Do not want to use sql parameters at this piont!
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Apr 6, 2004
I have a binary column with length 20 in SQL server table. I store dynamically C# byte[] value range from 0 to 19. So for example, If I store length of 16 and when I try to retrive it back into byte [] in C# it returns whole length 20. When I see in debug it has value from 0 to 15 which I want to use but from 16 to 19 is zero. How can I get just length value which I stored.
I use DataRow to get whole row and from the row object I extract byte [] based on column name.
Thank you in advance....
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Aug 24, 2007
Hello,
I need some help working with CLR UDTs. I have created two UDTs called trajectory and point. Each trajectory consists of a list of points. Each point consists of three members : lon( type double), lat( type double) and datetime.
I have written my own IBinarySerialize.Write method for the trajectory type which is the following:
Dim maxSize As Integer = 4000
Dim value As String = ""
Dim paddedvalue As String
Dim i As Integer
Dim pt As Point
For i = 0 To point_list.Count - 1
pt = point_list.Item(i)
If i = 0 Then
value = value & pt.X & "|" & pt.Y & "|" & pt.D
Else
value = value & ">" & pt.X & "|" & pt.Y & "|" & pt.D
End If
Next
paddedvalue = value.PadRight(maxSize, ControlChars.NullChar)
For i = 0 To paddedvalue.Length - 1 Step 1
w.Write(paddedvalue(i))
Next
If I try to store 225 points for a trajectory then the following error occurs:
System.Data.SqlTypes.SqlTypeException: The buffer is insufficient. Read or write operation failed.
Why is that happening? The limit size for a UDT is 8000bytes. Each point needs 24Bytes (2*SizeOf(double) + sizeOf(Datetime)).
Please help
ST
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Dec 18, 2006
I have a bigint column called "MillisecondsSince1970" that I need to convert to a date - SSIS is erroring out when I use DATEADD with the 8 byte int (if I use 4 byte it works but the column is bigger than 4 byte). The error is really lame:
[Derived Column [79]] Error: The "component "Derived Column" (79)" failed because error code 0xC0049067 occurred, and the error row disposition on "output column "Date" (100)" specifies failure on error. An error occurred on the specified object of the specified component.
Anyone have a way around it... a VB.NET equivalent of DATEADD or something else I can do?
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Nov 28, 2007
Hi,
Can we regenerate a .rdl file based on the byte[] stream created by Render method?
user sends the report name with parameters to application server and it is application server sends the request to Reporting Server and get the report back (Render method). But how to pass the returned byte[] stream to user and show her/him a report?
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Apr 20, 2004
I have followed many examples found on this site, but still get an invalid cast execption when I attempt to run code below. the exception is thrown when I try to convert the sql image to a byte[] in the download section of the code.
//
// sqlUploadImage
//
this.sqlUploadImage.CommandText = "INSERT INTO Image_Table (Description, Type, Lenth, DocName) VALUES (@Description," +
" @Type, @Length, @DocName)";
this.sqlUploadImage.Connection = this.sqlConnection2;
this.sqlUploadImage.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Description", System.Data.SqlDbType.VarChar, 50, "Description"));
this.sqlUploadImage.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Type", System.Data.SqlDbType.VarChar, 50, "Type"));
this.sqlUploadImage.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Length", System.Data.SqlDbType.Int, 4, "Lenth"));
this.sqlUploadImage.Parameters.Add(new System.Data.SqlClient.SqlParameter("@DocName", System.Data.SqlDbType.VarChar, 50, "DocName"));
this.sqlUploadImage.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Image", System.Data.SqlDbType.Image, 16, "ImgField"));
this.Button2.Click += new System.EventHandler(this.Button2_Click);
//
// sqlDownLoadImage
//
this.sqlDownLoadImage.CommandText = "SELECT Image_Table.* FROM Image_Table";
this.sqlDownLoadImage.Connection = this.sqlConnection2;
//upload file
private void Button1_Click(object sender, System.EventArgs e)
{
//Get the filename of the pdf file to be uploaded.
string strFilename = File1.PostedFile.FileName.Substring(File1.PostedFile.FileName.LastIndexOf("\") +1);
//Get the file type
string strFileType = File1.PostedFile.ContentType;
//Get the file size
int intImageSize = File1.PostedFile.ContentLength;
// Reads the Image
Stream ImageStream = File1.PostedFile.InputStream;
byte[] ImageContent = new byte[intImageSize + 1];
int intStatus = 0;
intStatus = ImageStream.Read(ImageContent, 0, intImageSize);
//Response.Write(strFilename.ToString());
//Response.Write("<br>Image Type: " + strFileType.ToString());
//Response.Write("<br>Image Size: "+intImageSize.ToString());
this.sqlUploadImage.Parameters["@Description"].Value = strFilename;
this.sqlUploadImage.Parameters["@Type"].Value = strFileType;
this.sqlUploadImage.Parameters["@Length"].Value = intImageSize;
this.sqlUploadImage.Parameters["@DocName"].Value = "TestPDF";
this.sqlUploadImage.Parameters["@Image"].Value = ImageContent;
try
{
this.sqlConnection2.Open();
this.sqlUploadImage.ExecuteNonQuery();
this.Label2.Text = "File Uploaded Successfully";
this.Button2.Visible = true;
}
catch(SqlException ex)
{
Response.Write(ex.ToString());
}
finally
{
this.sqlConnection2.Close();
}
}
//download file
private void Button2_Click(object sender, System.EventArgs e)
{
try
{
this.sqlConnection2.Open();
SqlDataReader r = this.sqlDownLoadImage.ExecuteReader(CommandBehavior.CloseConnection);
if(r.Read())
{
Response.ContentType = r["Type"].ToString();
byte[] image = (byte[])r["ImgField"];
Response.BinaryWrite(image);
}
}
catch(SqlException ex)
{
Response.Write(ex.ToString());
}
finally
{
this.sqlConnection2.Close();
}
}
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May 22, 2001
Experts,
i have trouble while insert/update a field which contains double-byte characters (Chinese Traditional).
NO PROBLEM if i m using Enterprise Manager to view/edit the data. They are retrieved properly in the following:
(1) Enterprise Manager
(2) Query Analyzer
(3) Visual Basic
(4) Command prompt isql
EACH of the Chinese words are become a qustion mark '?' if the UPDATE SQL or stored procedure executed in the following:
(2) Query Analyzer
(3) Visual Basic
WHILE (4) Command prompt isql does not have the problem for the same UPDATE SQL and stored procedure.
Do you have any idea?
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Jan 17, 2001
I want to store some double byte characters in a table. Originally I planed to change all data type of fields which will store double bytes from VARCHAR() to NVARCHAR(). But i just found out we have no problem to pull and store foreign content(double byte characters) in fields with VARCHAR type( the content is showing correct after stored in database)
my question is : if VARCHAR can handle double byte character, what's the point of using NVARCHAR to store unicode character? any advice is appreciated.
Michael
ming.shi@factiva.com
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Feb 4, 2008
Hi,
Just wondering if anyone knows if you can create a certificate from a byte[]. For example, you can create an assembly using CREATE ASSEMBLY FROM 0x...; specifying the hex representation of it - can you do the same with a certificate? This means that you don't need to save the file to disk before loading it into the database.
Cheers,
Adam
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Mar 1, 2007
Hello, I'm having users upload documents to my db and storing them as an Image datatype, I can do that without an issue. I'm also able to find that record and return it as a byte(). Now, what's the best practice/scheme to return it to the browser, even FF, and have it prompt the user with the Open or Download thing Dialogue we all know and love.
Thanks in advance.
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Jan 8, 2006
Hello, I am using .net 1.1 and sql server 2000.
I want to store a byte array, but it seems that only a string is stored there.
Code:
SHA512 sha = new SHA512Managed();
byte[] ReturnedPasswordByte = sha.ComputeHash(ToCryptByte);
MyGenericCommand.Parameters.Add("@Password", ReturnedPasswordByte);
MyConnection.Open();
MyGenericCommand.ExecuteNonQuery();
MyConnection.Close();
If I select the record later, all I get is "System.Byte[]" (as string)
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Feb 18, 2004
I've created a DTS package -- that uses a query to export to a .txt file. My question is -- if the results of this query are zero (no results returned within the package ) -- how can I tell the package not to export a zero byte file. Any thoughts on that? Any help you could give would be greatly appreciated. Thanks!
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Jun 7, 2007
I'm having trouble adding a 4-byte integer with an 8-byte integer. Here's what I'm doing:
Column Name: BIG_ID
Derived Column: < add as new column >
Expression: (DT_I8)[ID] + 840230000538058
Data Type: eight-byte signed integer {DT_I8]
The error I get:
The literal 840230000538058 is too large to fit into type DT_I4. The magnitude of the literal overflows the type.
Then I try the expression:
(DT_I8)[ID] + (DT_I8)840230000538058
and
[ID] + 840230000538058
and get the same error.
What am I doing wrong? Is it possible to add 2 8-byte integers in regular expression? Why does it still think the literal is DT_I4?
Thanks,
Michael
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Oct 10, 2006
i'm trying to read an image file from a database(ms-sql, .mdf) with type image. Anyone have any ideas on how to do this? I have a table adapter created but could not assign it to my byte[] variable. Thanks in advance.
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Nov 23, 1999
Hi, I'm a bit new to DTS but the problem I have encountered relates to importing a text file. On occasion the file is zero bytes which causes an error in DTS. I have added some VBScript to the workflow to check the filesize. If size > 0 then I set Main = DTSStepScriptResult_ExecuteTask otherwise Main = DTSStepScriptResult_DontExecuteTask. This all works fine except that when the file is 0 the dependent process that is waiting for completion/success does not run, presumably because the task was not run (as reqd). I have tried setting the status rather the DontExecuteTask but then the task runs anyway creating the error. Anyonw know how to get this to work or how to get around the problem?
regards
Ken
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Jan 21, 2004
Hi,
I have a text file (5 MB). It appears as a single line in a text editor. But actually it has records of 1500 byte length each.
I want to strip it down to 1500 byte records. So 1500*3500 = 5 MB (approx). The record size is always 1500 bytes.
Does anyone have a script that I can run on this file to achieve this break.
Thanks
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Mar 13, 2004
Why can varchar datatype variable only 4000 byte?
For example:
in a storedprocedure
declare @aa varchar(8000)
......
while
select @aa=@aa+@otherinfo
end
when the length is more than 4000 ,the data in the behind will be lost
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