varbinary

问题 Is there some efficient way how to get length of data in "varbinary(max) filestream" column? I found only samples with conversion to varchar and then calling the "LEN" function. 回答1: SELECT length = DATALENGTH(Name), Name FROM Production.Product ORDER BY Name "Returns the number of bytes used to represent any expression." T-SQL and quote taken from MSDN's DATALENGTH (Transact-SQL) library. 来源： https://stackoverflow.com/questions/748165/length-of-varbinarymax-filestream-on-sql-server-2008

问题 How can I get fluent nhibernate to create a varbinary field in a sql server 2005 table that uses a field size of varbinary(max)? At the moment I always get a default of varbinary(8000), which isn't big enough as i'm going to be storing image files. I've tried using CAstle.ActiveRecord but havent had any success yet. [ActiveRecord] public class MyFile : Entity { public virtual string FileName { get; set; } public virtual string FileType { get; set; } public virtual int FileVersion { get; set;

问题 SELECT 0x0000987C As col1, substr(BinaryData,1,4) As col2, CAST(0x0000987C AS SIGNED) As col3, CAST(substr(BinaryData,1,4) AS SIGNED) As col4 FROM ( SELECT 0x0000987C00000000 AS BinaryData ) d Returns col1 col2 col3 col4 ---- ---- ----- ---- BLOB BLOB 39036 0 When I look at the BLOB viewer for col1 and col2 they both appear identical (screenshot below). So why the different results for col3 and col4? 回答1: I think it has to do with data types. BinaryData has an integer data type, but substr

问题 I have a following problem - I'm trying to save byte[] to database and I just figured out that it works for one byte only. I have number of floats that I convert to byte[] and use that as a parameter: param = new SqlParameter(name, type, ((byte[])value).Length); type is VarBinary , value is the byte array. I add that parameter to my SqlCommand and just before it gets executed the whole byte array "sits" in that parameter and _msize of that parameter is correct (20 for 20 bytes I assume is

问题 We have a table in Oracle with a BLOB column that needs to be filled with a small amount of arbitrary byte data--we will never put in more than 4000 bytes of data. I am working with an existing C++ OCI-based infrastructure that makes it extremely difficult to use bind variables in certain contexts, so I need to populate this BLOB column using only a simple query. (We are working to modernize it but that's not an option today,) We had some luck with a query like this: UPDATE MyTable SET

问题 Is it better to set an index (primary or secondary) on a varchar(x) or varbinary(x) column? I wasn't sure it even mattered. However what I see online (Googled - varchar vs varbinary) is that varchar is almost dead or being pushed to the way side. So is this better to index or something? Could it be the type of index? Excellent scenario: Indexing email addresses ( [edit] encrypted byte array {varbinary} or string equivalent {varchar}) Thanks Answer? It seems that indexes on varbinary is the

问题 Using just an sql query is it possible to write the contents of a varbinary cell to the file system? I have a column that stores pdf s as and for some quick testing I'd like to write out the pdfs to the filesystem. Thanks for any help. 回答1: Similar Question Here. How to dump all of our images from a VARBINARY(MAX) field in SQL Server 2008 to the filesystem? You'll need to iterate through each row and perform a BCP (BulkCopy) Dump of each varbinary field to the filesystem 来源： https:/

问题 I'm using the code cmd.Parameters.Add("@Array", SqlDbType.VarBinary).Value = Array; The SqlDbType.VarBinary description states that it can only handle array's upto 8 K bytes. I have a byte array that represents an image and can go upto 10k bytes. How do I store that in a varbinary(max) column using C#? I have no trouble creating the array. I'm stuck at this 8k limit when trying to execute the query. Edit: Let me clarify, on my machine even pictures upto 15k bytes get stored on the database in

问题 I am trying to convert a String Hex number back into a Byte() in CSharp & I just can't do it! These Binary numbers are stored in a varBinary(8) column inside Sql Server 2012. A format example is : 0x000000003B654362 I have no problem geting them from the database & turning them into a String. But when I want to query the database using this Hex number as a key I want to turn the String back into a cSharp Byte type. I get an error "Input String is not in correct format" everytime I try to use

问题 This is yet again a problem I have with saving images in silverlight to my database, I thought I had it all working untill I tried it out with a different image... I save images to my database with following method. I first convert the image to an array of byte and then send it to my service. private void btnUpload_Click(object sender, RoutedEventArgs e) { //nieuwe instantie van de klasse "Afbeelding", om later door te sturen naar service Afbeelding a = new Afbeelding(); OpenFileDialog