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2009-09-18

How-to generate update statements on SqlServer 2005 , 2008



alter PROCEDURE [dbo].[procUtils_GenerateMetaUpdate]  
@TableName [varchar](50)  
WITH EXECUTE AS CALLER  
AS  
BEGIN -- proc start                                    
SET NOCOUNT ON;                                    
BEGIN TRY        --begin try                          
--CODE SNIPPET TO LIST TABLE COLUMNS         
-- RUN IN SSMS WITH cTRL + t FIRST TO OUTPUT THE RESULT TO TEXT FOR COPY PASTE        
--FIRST SEARCH THE TABLE WHICH HAD A "Feature" in its name         
--SELECT NAME FROM SYS.TABLES WHERE NAME LIKE '%Feature%'        
--select column_name from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='Feature'            
--Declare the Table variable             
DECLARE @ColNames TABLE            
(            
Number INT IDENTITY(1,1), --Auto incrementing Identity column            
ColName VARCHAR(300) , --The string value            
DataType varchar(50) --the datatype   
)            
--Decalre a variable to remember the position of the current delimiter            
DECLARE @CurrentDelimiterPositionVar INT             
--Decalre a variable to remember the number of rows in the table            
DECLARE @Count INT            
--Populate the TABLE variable using some logic            
INSERT INTO @ColNames SELECT column_name , Data_type from INFORMATION_SCHEMA.COLUMNS         
where TABLE_NAME=@TableName            
--Initialize the looper variable            
SET @CurrentDelimiterPositionVar = 1            
--Determine the number of rows in the Table            
SELECT @Count=max(Number) from @ColNames            
--A variable to hold the currently selected value from the table            
DECLARE @ColumnName varchar(300);            
DECLARE @DataType varchar(50)  
print '  
SET NOCOUNT ON;  
SET XACT_ABORT ON;  
GO  
SELECT TOP 5 * FROM ' + @TableName + ' order by 1 desc   
GO  
'  
print 'UPDATE ' + @TableName + ' SET '            
--Loop through until all row processing is done            
WHILE @CurrentDelimiterPositionVar <= @Count            
BEGIN            
--Load current value from the Table            
SELECT @ColumnName = ColName FROM @ColNames WHERE Number = @CurrentDelimiterPositionVar  
SELECT @DataType = DataType FROM @ColNames WHERE Number = @CurrentDelimiterPositionVar    
--Process the current value            
if @CurrentDelimiterPositionVar = @Count            
begin
print '[' + @ColumnName + ']= ''' + @ColumnName + '''--type of ' + @DataType 
-- this is the last row no comma!        
end
else         
begin
print '[' + @ColumnName + ']= ''' + @ColumnName + ''', --type of '  + @DataType 
-- print it without the ,        
-- print 'obj1.' + @ColumnName+ ' = obj2.'+ @ColumnName        
end
-- print @ColumnName    --SIMPLE PRINT        
--Increment loop counter            
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;            
END            
print 'WHERE '            
--AND START ALL OVER AGAIN       
SET @CurrentDelimiterPositionVar = 1  
--Loop through until all row processing is done            
WHILE @CurrentDelimiterPositionVar <= @Count            
BEGIN            
--Load current value from the Table            
SELECT @ColumnName = ColName FROM @ColNames WHERE Number = @CurrentDelimiterPositionVar  
SELECT @DataType = DataType FROM @ColNames WHERE Number = @CurrentDelimiterPositionVar    
--Process the current value            
if @CurrentDelimiterPositionVar = @Count            
begin
print '[' + @ColumnName + ']=' +  ''''' -- type of ' + @DataType 
-- this is the last row no comma!        
end
else
begin         
print '[' + @ColumnName + ']=' +  ''''' AND -- type of ' + 
@DataType  
-- print it without the ,        
-- print 'obj1.' + @ColumnName+ ' = obj2.'+ @ColumnName        
-- print @ColumnName    --SIMPLE PRINT        
--Increment loop counter            
end
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;            
END            
set nocount off         
PRINT '-- NOW VIEW THE RESULTS '        
PRINT 'Select top 5  * from '+ @TableName +' order by 1 desc   '  
END TRY        --end try                          
BEGIN CATCH                                
print ' Error number: ' + CAST(ERROR_NUMBER() AS varchar(100)) +                       
'Error message: ' + ERROR_MESSAGE() + 'Error severity: ' +         
CAST(ERROR_SEVERITY() AS varchar(10)) +                       
'Error state: ' + CAST(ERROR_STATE() AS varchar(100)) +         
'XACT_STATE: ' + CAST(XACT_STATE() AS varchar(100))                                
END CATCH                                
END --procedure end                                     
/*         
USE [Db]        
GO        
SELECT NAME FROM SYS.tables where name like '%Msg%'        
EXEC [dbo].[procUtils_GenerateMetaUpdate] @TableName = N'msg'  
GO        
*/ 

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