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2009-10-21

Sql 2008 stored procedure for creating history tables out of passed existing table



USE [MyDb]
GO
 
/****** Object:  StoredProcedure [dbo].[procUtils_GenerateHistoryTable]    Script Date: 10/21/2009 09:56:56 ******/
SET ANSI_NULLS ON
GO
 
SET QUOTED_IDENTIFIER ON
GO
 
alter PROCEDURE [dbo].[procUtils_GenerateHistoryTable]
@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               
IsNullable varchar(3) -- whether or not this table col is nullable
)                        
--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   
DECLARE @sqlTxtToPrint varchar(max)
SET @sqlTxtToPrint = ' USE MyDb 
GO'
 
--Populate the TABLE variable using some logic                        
-- SELECT *  from INFORMATION_SCHEMA.COLUMNS         
INSERT INTO @ColNames SELECT column_name , Data_type , IS_NULLABLE 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)              
DECLARE @PkColName varchar(200)
DECLARE @IsNullable varchar(3)
 
set @sqlTxtToPrint = '              
SET NOCOUNT ON;              
SET XACT_ABORT ON;              
GO 
DROP TABLE [dbo].[' + @TableName + 'History]
GO
 
CREATE TABLE [dbo].[' + @TableName + 'History](' + CHAR(13)              
--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    
SELECT @IsNullable = IsNullable FROM @ColNames WHERE Number = @CurrentDelimiterPositionVar    
--PRINT EACH COLUMN WITH , AT THE END 
if @CurrentDelimiterPositionVar = 1 
BEGIN --IF THIS IS THE FIRST COL = PK
set @PkColName = @TableName + 'HistoryId' 
set @sqlTxtToPrint = @sqlTxtToPrint +  
'[' + @PkColName + '][int] IDENTITY(1,1) NOT NULL,' + CHAR(13)
END --IF THIS IS THE FIRST COL = PK
IF @IsNullable = 'YES'
BEGIN --IF @IsNullable = 'YES'
set @sqlTxtToPrint = @sqlTxtToPrint +  
'[' + @ColumnName + ']['  + @DataType  +     
'] NULL ,'+ CHAR(13)
end --IF @IsNullable = 'YES'
else 
begin --IF @IsNullable = 'NO'
set @sqlTxtToPrint = @sqlTxtToPrint +  
'[' + @ColumnName + ']['  + @DataType  +     
'] NOT NULL,'+ CHAR(13)
 
end --IF @IsNullable = 'NO'
-- print 'obj1.' + @ColumnName+ ' = obj2.'+ @ColumnName                    
-- print @ColumnName    --SIMPLE PRINT                    
--Increment loop counter                        
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1
END                        
 
set @sqlTxtToPrint = @sqlTxtToPrint +  '[SqlLogin] [varchar](50) NOT NULL,
[Action] [varchar](50) NOT NULL,
[UpdatedWhen] [datetime] NOT NULL 
CONSTRAINT [PK_' + @TableName + 'History] PRIMARY KEY CLUSTERED 
(
[' + @PkColName + '] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
 
 
GO
SET ANSI_PADDING ON
 
'
--NOW ADD SOME USEFULL STATEMENTS 
set @sqlTxtToPrint = @sqlTxtToPrint +  
+ 'SELECT NAME FROM SYS.PROCEDURES WHERE NAME LIKE ''%PROC%''' + CHAR(13)       
+ 'SELECT NAME FROM SYS.TABLES WHERE NAME LIKE ''%TABLE%'''    + CHAR(13)    
+ 'exec sp_HelpText procUtils_GenerateMetaInsert'        + CHAR(13)
+ 'exec procUtils_GenerateMetaInsert ''TABLE'''        + CHAR(13)
 
--AT THE END PRINT THE RESULT 
PRINT @sqlTxtToPrint
 
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 [MyDb]                    
GO                    
SELECT NAME FROM SYS.tables where name like '%Msg%'                    
EXEC [dbo].[procUtils_GenerateHistoryTable] @TableName = N'Feat'              
 
*/ 
GO

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