<iReference>
  <chAuditorCode IsChanged="false">00003479</chAuditorCode>
  <vcAuditorDesc IsChanged="true">Brodie's HomeSton</vcAuditorDesc>
  <sdTermDate IsChanged="false">NULL</sdTermDate>
  <Action />
  <Comment />
  <chUpdateStaffCode>AU941170</chUpdateStaffCode>
  <dtUpdateDateTime>2010-07-22T09:42:20</dtUpdateDateTime>
  <ChangedColumns>vcAuditorDesc,chUpdateStaffCode,dtUpdateDateTime,dtUpdateDateTime</ChangedColumns>
</iReference>

SELECT  xmlDetail.value('/iReference[1]/ChangedColumns[1]/.','VARCHAR(255)')  
FROM tblReferenceHistory
WHERE intReferenceHistoryID = 125

<iReference>
  <chAuditorCode IsChanged="false">00003479</chAuditorCode>
  <vcAuditorDesc IsChanged="true">Brodie's HomeSton</vcAuditorDesc>
  <sdTermDate IsChanged="false">NULL</sdTermDate>
  <Action />
  <Comment />
  <chUpdateStaffCode>AU941170</chUpdateStaffCode>
  <dtUpdateDateTime>2010-07-22T09:42:20</dtUpdateDateTime>
  <ChangedColumns/>
</iReference>

DECLARE @ChangedColumns VARCHAR(255)
 
SELECT @ChangedColumns = xmlDetail.value('/iReference[1]/ChangedColumns[1]/.','VARCHAR(255)')  
FROM tblReferenceHistory
WHERE intReferenceHistoryID = 125
 
-- first update - add a new <ChangedColumns>...</ChangedColumns> node    
UPDATE tblReferenceHistory
SET xmlDetail.MODIFY('insert <ChangedColumns>{sql:variable("@ChangedColumns")}</ChangedColumns> as last into (/iReference)[1]') 
WHERE intReferenceHistoryID = 124
 
-- second update - remove the empty <ChangedColumns /> node    
UPDATE dbo.tblReferenceHistory
SET xmlDetail.MODIFY('delete (/iReference[1]/ChangedColumns[1])[1]') 
WHERE intReferenceHistoryID = 124
 
SELECT xmlDetail.value('/iReference[1]/ChangedColumns[1]/.','VARCHAR(255)')  
FROM tblReferenceHistory
WHERE intReferenceHistoryID = 124

	DECLARE @nvcSQL			NVARCHAR(MAX)	
	DECLARE @pvcTableName	VARCHAR(255)
	DECLARE @pvcColumn		VARCHAR(255)
	DECLARE @pvcValue		NVARCHAR(MAX)
 
	--This is used to actually get the primary key for identity record
	DECLARE @dvcPrimaryKey VARCHAR(255) 
	SET @dvcPrimaryKey = ''
 
	DECLARE @dintPrimaryKey INT	
	SELECT @dvcPrimaryKey = ISNULL(NAME,'') FROM SYS.COLUMNS WHERE OBJECT_NAME(OBJECT_ID) = @pvcTableName AND Is_Identity = 1 
 
 
	-- Only execute when there is a @pvcValue.
	IF @pvcValue <> ''
	BEGIN
		SELECT @nvcSQL = 'INSERT INTO ' + @pvcTableName + '(' + @pvcColumn+ ') VALUES (' + @pvcValue + ')'
		SELECT @nvcSQL = @nvcSQL + ';' + 'SELECT @dintPrimaryKey = SCOPE_IDENTITY()'
		--PRINT @nvcSQL
 
		EXEC sp_executesql @query = @nvcSQL, @params = N'@dintPrimaryKey INT OUTPUT', @dintPrimaryKey = @dintPrimaryKey OUTPUT 
		--EXEC (@nvcSQL)
	END
 
	IF @dvcPrimaryKey <> ''
	BEGIN
		SELECT (@dvcPrimaryKey + ' = ' + CAST(@dintPrimaryKey AS VARCHAR(10)))  AS PrimaryKey 
	END
	ELSE
	BEGIN
		SELECT '' AS PrimaryKey
	END

CREATE TABLE #temp_dbs_table
(
[db_name] sysname NOT NULL PRIMARY KEY,
[mod] tinyint NOT NULL DEFAULT 1
)
 
INSERT INTO #temp_dbs_table ([db_name])
SELECT
name
FROM
master..sysdatabases
WHERE
dbid > 4 --- skip master, tempdb, model and msdb databases
 
declare @db_name sysname
 
SET @db_name = ''
 
while @db_name IS NOT NULL
begin
SET @db_name = NULL
 
SELECT top 1 @db_name = [db_name] FROM #temp_dbs_table where [mod] = 1
 
IF @db_name IS NULL
break
 
print '--------------------------------------------------'
 
print '> Database: ' + @db_name
 
print '> Changing recovery mode to simple'
 
declare @n_cmd nvarchar(4000)
 
SET @n_cmd = 'alter database [' + @db_name + '] set recovery simple'
 
exec sp_executesql @n_cmd
 
print '> Shrinking database'
 
SET @n_cmd = 'dbcc shrinkdatabase([' + @db_name + '])'
 
exec sp_executesql @n_cmd
 
UPDATE #temp_dbs_table set [mod] = 0 where [db_name] = @db_name
end
 
DROP TABLE #temp_dbs_table

BEGIN TRY
BEGIN TRANSACTION transABC
 
INSERT INTO TABLEA (col1,col2,col3) VALUES ('a','b','c')
INSERT INTO TABLEB (col1,col2,col3) VALUES ('a','b','c')
 
UPDATE TABLEA SET col2='abcde' WHERE col1 = 'a'
 
COMMIT TRANSACTION transABC
END TRY
 
BEGIN CATCH
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION transABC --RollBack in case of Error
 
-- Raise an error with the details of the exception
DECLARE @ErrMsg nvarchar(4000), @ErrSeverity int
SELECT @ErrMsg = ERROR_MESSAGE(),
@ErrSeverity = ERROR_SEVERITY()
 
RAISERROR(@ErrMsg, @ErrSeverity, 1)
 
END CATCH

CREATE TABLE #dtblJobsBillDates
(
		chProcessID			CHAR(03)		COLLATE database_default NOT NULL,
		intAssgnmtID		INTEGER									 NOT NULL,
		chBillOfficeCode	CHAR(03)		COLLATE database_default NOT NULL,
		chBillEntityCode	CHAR(03)		COLLATE database_default NOT NULL,
		chBillNo			CHAR(08)		COLLATE database_default NOT NULL,
		PRIMARY KEY (intAssgnmtID, chBillNo, chProcessID, chBillOfficeCode, chBillEntityCode)
)

using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using Zip = ICSharpCode.SharpZipLib.Zip.Compression;
 
namespace CLRCompressionFunctions
{
    public partial class CompressionCore
    {
        [SqlFunction()]
        public static SqlBytes fn_Compress(SqlBytes uncompressedBytes)
        {
            if (uncompressedBytes.IsNull)
                return uncompressedBytes;
 
            MemoryStream memory = new MemoryStream();
 
            ICSharpCode.SharpZipLib.Zip.Compression.Streams.DeflaterOutputStream stream =
                new ICSharpCode.SharpZipLib.Zip.Compression.Streams.DeflaterOutputStream(memory, new Zip.Deflater(Zip.Deflater.BEST_COMPRESSION), 131072);
 
            stream.Write(uncompressedBytes.Buffer, 0, Convert.ToInt32(uncompressedBytes.Length));
            stream.Flush();
            stream.Close();
            stream = null;
 
            return new SqlBytes(memory.ToArray());
        }
 
        [SqlFunction()]
        public static SqlBytes fn_Decompress(SqlBytes compressedBytes)
        {
            if (compressedBytes.IsNull)
                return compressedBytes;
 
            ICSharpCode.SharpZipLib.Zip.Compression.Streams.InflaterInputStream stream =
                new ICSharpCode.SharpZipLib.Zip.Compression.Streams.InflaterInputStream(new MemoryStream(compressedBytes.Buffer));
            MemoryStream memory = new MemoryStream();
            byte[] writeData = new byte[4096];
            int size;
 
            while (true)
            {
                size = stream.Read(writeData, 0, writeData.Length);
                if (size > 0)
                {
                    memory.Write(writeData, 0, size);
                }
                else break;
            }
            stream.Flush();
            stream.Close();
            stream = null;
 
            return new SqlBytes(memory.ToArray());
        }
 
[SqlFunction()]
        public static SqlString fn_WriteFile(SqlString path, SqlBytes bytesFile, SqlBoolean isCompressed)
        {
            string returnString = string.Empty;
 
            try
            {
                //check if the file exists or not
                FileStream myFStream = new FileStream(path.ToString(), FileMode.OpenOrCreate, FileAccess.ReadWrite);
 
                SqlBytes fileBytes = bytesFile;
 
                if (isCompressed)
                {
                    fileBytes = fn_Decompress(bytesFile);
                }
 
                int Length = 256;
                Byte[] buffer = new Byte[Length];
 
                Stream readStream = fileBytes.Stream;
 
                int bytesRead = readStream.Read(buffer, 0, Length);
 
                // write the required bytes
                while (bytesRead > 0)
                {
                    myFStream.Write(buffer, 0, bytesRead);
                    bytesRead = readStream.Read(buffer, 0, Length);
                }
 
                readStream.Close();
                myFStream.Close();
                returnString = "File is written successfully";
            }
            catch (Exception ex)
            {
                returnString = ex.ToString();
            }
 
            return new SqlString(returnString);
        }
    }
}

ALTER DATABASE TestAssembly SET TRUSTWORTHY ON
GO
EXEC sp_configure 'clr enabled', 1;
RECONFIGURE WITH OVERRIDE;
GO
CREATE ASSEMBLY [ICSharpCode.SharpZipLib.dll]
                  FROM 'D:\Applications\FileCompressorApp\CLRCompressionFunctions\Deployment\ICSharpCode.SharpZipLib.dll'
                  WITH PERMISSION_SET = UNSAFE
GO
CREATE ASSEMBLY [CLRCompressionFunctions]
                  FROM 'D:\Applications\FileCompressorApp\CLRCompressionFunctions\Deployment\CLRCompressionFunctions.dll'
                  WITH PERMISSION_SET = EXTERNAL_ACCESS
GO

CREATE ASSEMBLY [System.Drawing.dll]
FROM 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll'
WITH PERMISSION_SET = UNSAFE

CREATE FUNCTION [fn_Compress]           (
                 @uncompressedBytes varbinary(MAX))
            RETURNS varbinary(MAX)
            AS    EXTERNAL NAME CLRCompressionFunctions.[CLRCompressionFunctions.CompressionCore].fn_Compress
GO
CREATE FUNCTION [fn_Decompress]           (
                 @uncompressedBytes varbinary(MAX))
            RETURNS varbinary(MAX)
            AS    EXTERNAL NAME CLRCompressionFunctions.[CLRCompressionFunctions.CompressionCore].fn_Decompress
GO
CREATE FUNCTION [fn_WriteFile]           (
                 @path nvarchar(4000),
				 @bytesFile varbinary(MAX),
				 @bitCompressed bit)
			RETURNS nvarchar(4000)
            AS    EXTERNAL NAME CLRCompressionFunctions.[CLRCompressionFunctions.CompressionCore].fn_WriteFile
GO

SELECT dbo.[fn_Compress](testimage) FROM tblImages
SELECT dbo.[fn_Decompress](imgFileContent) FROM TABLE_NAME
GO	
SELECT dbo.[fn_WriteFile]('c:\test.pdf',imgFileContent, 0) FROM TABLE_NAME
GO