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2010-03-29

how-to generate classes based on tables in ms sql 2008 ( see previous posts )



/****** Object:  StoredProcedure [dbo].[procUtils_GenerateClass]    
Script Date: 03/20/2010 13:10:40 ******/
IF  EXISTS (SELECT * FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[procUtils_GenerateClass]') AND type in (N'P', N'PC'))
DROP PROCEDURE [dbo].[procUtils_GenerateClass]
GO
 
/****** Object:  StoredProcedure [dbo].[procUtils_GenerateClass]    
 
Script Date: 03/20/2010 13:10:40 ******/
SET ANSI_NULLS ON
GO
 
SET QUOTED_IDENTIFIER ON
GO
 
 
CREATE PROCEDURE [dbo].[procUtils_GenerateClass]
@TableName [varchar](50)
WITH EXECUTE AS CALLER
AS
BEGIN -- proc start                                      
SET NOCOUNT ON;                                      
 
DECLARE @DbName nvarchar(200 ) 
DECLARE @CSharpDataType nvarchar(200)
select @DbName = DB_NAME()               
declare @strCode nvarchar(max) 
set @strCode = ''
 
-- use this variable while generating code 
DECLARE @WinNewLine nvarchar(2)
set @WinNewLine = CONVERT ( nvarchar(2) , CHAR(13) + CHAR(10))
 
-- this is a horizontal tab
DECLARE @Tab nvarchar(1)
set @Tab = CONVERT(NVARCHAR(1) , CHAR(9))
 
SET @DbName = 'Cas'
 
BEGIN TRY        --begin try                            
 
set @strCode = @strCode +  'using System ;  ' + @WinNewLine + @WinNewLine
 
set @strCode = @strCode +  'namespace ' + @DbName + '.Model  {' + @WinNewLine  
set @strCode = @strCode +  'public class ' + @TableName + @Tab +  '{ ' + @WinNewLine  + @WinNewLine
set @strCode = @strCode +  @WinNewLine + '#region FieldsAndProps ' + @WinNewLine + @WinNewLine
--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 @ColNames TABLE                                
(                                
Number [int] IDENTITY(1,1), --Auto incrementing Identity column                              
ColName [varchar](300) , --The string value                        ,         
DataType varchar(50) ,  --the datatype                       
IS_NULLABLE nvarchar(5) , --should we add =null in front         
CHARACTER_MAXIMUM_LENGTH INT        
)                                
--Decalre a variable to remember the position of the current delimiter                                
DECLARE @CurrentDelimiterPositionVar INT                                 
DECLARE @PkColName varchar(200)      
set @PkColName = ''
declare @ColumnName varchar(200)  
--Decalre a variable to remember the number of rows in the table                                
DECLARE @Count INT                                
--Populate the TABLE variable using some logic                                
-- SELECT * from INFORMATION_SCHEMA.COLUMNS                             
 
--SET IDENTITY_INSERT ON ; 
INSERT INTO @ColNames         
SELECT column_name ,  Data_type , IS_NULLABLE , CHARACTER_MAXIMUM_LENGTH  
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 @ColName varchar(300);                                
DECLARE @DataType varchar(50)                      
DECLARE @IS_NULLABLE VARCHAR(5)        
DECLARE @CHARACTER_MAXIMUM_LENGTH INT        
-- START GENERATING PROPERTIES   
--Loop through until all row processing is done              
WHILE @CurrentDelimiterPositionVar <= @Count --1st loop        
BEGIN                                
--Load current value from the Table                                
SELECT @ColName = ColName FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar        
SELECT @DataType = DataType FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar               
SELECT @IS_NULLABLE = IS_NULLABLE FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar                    
SELECT @CHARACTER_MAXIMUM_LENGTH = CHARACTER_MAXIMUM_LENGTH FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar                    
 
IF @DataType = 'timestamp'        
begin 
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;                                
continue ; 
end 
 
 
 
-- get the C# type based on the passed sqlType, )( needs the DbVsCSharpTypes table ) 
set @CSharpDataType=( SELECT  dbo.funcGetCLRTypeBySqlType(@DataType) )
 
 
 
DECLARE @varPrivate nvarchar(200) 
set @varPrivate = '_' + @ColName 
 
 
 
-- GENERATE THE START REGION PART 
SET @strCode = @strCode + @WinNewLine + @Tab+ @Tab + '#region ' + @ColName + @WinNewLine + @WinNewLine 
 
-- set the nullable 
IF @IS_NULLABLE = 'YES'  and @CSharpDataType <> 'string'      
SET @StrCode = @strCode +   'private ' + @CSharpDataType + '? ' +  @varPrivate + ' ;' + @WinNewLine 
ELSE 
SET @StrCode = @strCode +   'private ' + @CSharpDataType + ' ' +  @varPrivate + ' ;' + @WinNewLine 
 
 
 
 
 
-- GENERATE THE PUBLIC MEMBER 
IF @IS_NULLABLE = 'YES'  and @CSharpDataType <> 'string'
SET @StrCode = @strCode +   'public ' + @CSharpDataType +  '? ' + @ColName + @WinNewLine + '{' + @WinNewLine
ELSE 
SET @StrCode = @strCode +   'public ' + @CSharpDataType +  ' ' + @ColName + @WinNewLine + '{' + @WinNewLine
 
SET @StrCode = @strCode + @Tab + @Tab + 'get { return ' + @varPrivate + '; } ' 
SET @strCode = @strCode + @Tab + @Tab + 'set { ' + @varPrivate +' = value ; }' + @WinNewLine 
SET @strCode = @strCode + @Tab + '} //eof prop ' + @ColName + @WinNewLine 
 
-- GENERATE THE ENDREGION PART FOR THE PROPERTY
SET @strCode = @strCode + @WinNewLine + @Tab + @Tab + '#endregion ' + @ColName  + @WinNewLine
 
 
--if @CurrentDelimiterPositionVar != @Count         
--SET @StrCode = @StrCode + ''        
 
--PRINT @StrCode         
--DEBUGGING        
--PRINT '@ColName - ' + @ColName         
--PRINT '@CSharpDataType - ' + @CSharpDataType                  
--PRINT '@IS_NULLABLE - ' + @IS_NULLABLE         
--PRINT '@CHARACTER_MAXIMUM_LENGTH - ' +  CONVERT ( VARCHAR , @CHARACTER_MAXIMUM_LENGTH )   
 
set @strCode = @strCode + @WinNewLine     
SELECT @strCode 
SET @strCode = ''
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;                                
END   --eof while 1-st loop
SELECT @strCode --IF WE ARE GENERATING MORE THAN 4000 CHARS 
SET @strCode = ''                  
set @strCode = @strCode + @WinNewLine+ @WinNewLine + @Tab + @Tab +  '#endregion FieldsAndProps ' + @WinNewLine + @WinNewLine
-- END GENERATION PROPERTIES 
 
 
-- START CONSTRUCTOR 
SET @CurrentDelimiterPositionVar = 1 --RESTART THE COUNTER
set @strCode = @strCode +  @WinNewLine + '#region Constructor' + @WinNewLine + @WinNewLine
set @strCode = @strCode + 'public ' + @TableName + '(System.Data.DataRow dr ) ' + @WinNewLine + '{'
 
 
WHILE @CurrentDelimiterPositionVar <= @Count --2nd loop        
BEGIN                                
--Load current value from the Table                                
SELECT @ColName = ColName FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar        
SELECT @DataType = DataType FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar               
SELECT @IS_NULLABLE = IS_NULLABLE FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar                    
SELECT @CHARACTER_MAXIMUM_LENGTH = CHARACTER_MAXIMUM_LENGTH FROM @ColNames         
WHERE Number = @CurrentDelimiterPositionVar                    
 
IF @DataType = 'timestamp'        
begin 
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;                                
continue ; 
end 
 
 
 
-- get the C# type based on the passed sqlType, )( needs the DbVsCSharpTypes table ) 
set @CSharpDataType =( SELECT  dbo.funcGetCLRTypeBySqlType(@DataType) )
 
 
 
 
set @varPrivate = '_' + @ColName 
 
 
 
-- GENERATE THE START REGION PART 
SET @strCode = @strCode + @WinNewLine + @Tab+ @Tab + '#region ' + @ColName + @WinNewLine  + @WinNewLine
 
---- set the nullable 
--IF @IS_NULLABLE = 'YES'  and @Data <> 'string'      
--    SET @StrCode = @strCode +   'private ' + @CSharpDataType + '? ' +  @varPrivate + ' ;' + @WinNewLine 
--ELSE 
--    SET @StrCode = @strCode +   'private ' + @CSharpDataType + ' ' +  @varPrivate + ' ;' + @WinNewLine 
 
 
DECLARE @strConvertToCode nvarchar(200) 
set @strConvertToCode  =( SELECT  dbo.funcGetCLRConvertToCodeBySqlType(@DataType) )
 
 
-- THE DBNULL
--IF @IS_NULLABLE = 'YES'  and @DataType <> 'string'
--    BEGIN
SET @StrCode = @strCode + @Tab + @Tab + @Tab + 
'if (dr["' + @ColName + '"] != null && !(dr["' + @ColName + '"] is DBNull))
this.' + @ColName + ' = ' + @strConvertToCode  + '(dr["' + @ColName + '"]);' + @WinNewLine
 
--    END --EOF IF @IS_NULLABLE = 'YES'  and @DataType <> 'string'
--ELSE 
--    BEGIN
--    SET @StrCode = @strCode +   'public ' + @DataType +  ' ' + @ColName + @WinNewLine + '{' + @WinNewLine
--    END -- EOF ELSE IF @IS_NULLABLE = 'YES'  and @DataType <> 'string'
 
 
 
-- GENERATE THE END REGION PART FOR THE IF DR
SET @strCode = @strCode + @WinNewLine + @Tab+ @Tab + '#endregion ' + @ColName  + @WinNewLine + @WinNewLine
 
 
--??
--if @CurrentDelimiterPositionVar != @Count         
--SET @StrCode = @StrCode + ''        
 
--PRINT @StrCode         
--DEBUGGING        
--PRINT '@ColName - ' + @ColName         
--PRINT '@DataType - ' + @DataType                  
--PRINT '@IS_NULLABLE - ' + @IS_NULLABLE         
--PRINT '@CHARACTER_MAXIMUM_LENGTH - ' +  CONVERT ( VARCHAR , @CHARACTER_MAXIMUM_LENGTH )   
 
SELECT @strCode --IF WE ARE GENERATING MORE THAN 4000 CHARS 
set @strCode = ''
SET @CurrentDelimiterPositionVar = @CurrentDelimiterPositionVar + 1;                                
END --eof while 1-st loop 
 
SET @strCode = ''
 
set @strCode = @strCode + @Tab + '} //eof const for'+ @TableName 
set @strCode = @strCode + @WinNewLine + @WinNewLine + @Tab + '#endregion Constructor' + @WinNewLine + @WinNewLine
-- END CONSTRUCTOR 
 
-- BEGIN PARAMETERLESS CONST
set @strCode = @strCode +  @WinNewLine + '#region Parameterless Constructor' + @WinNewLine + @WinNewLine
set @strCode = @strCode + 'public ' + @TableName + '() ' + @WinNewLine + '{'
-- NOTHING HAPPENS HERE
set @strCode = @strCode + @Tab + '} //eof Parameterless const for'+ @TableName 
set @strCode = @strCode + @WinNewLine + @WinNewLine + @Tab + '#endregion Parameterless Constructor' + @WinNewLine + @WinNewLine
-- END PARAMETERLESS CONST
 
 
 
 
 
set @strCode = + @strCode + @WinNewLine + ' } //eof class ' + @TableName + @WinNewLine
set @strCode = + @strCode + @WinNewLine + ' } //eof namespace  ' + @WinNewLine
 
 
SELECT @strCode 
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(9)) +                         
'Error state: ' + CAST(ERROR_STATE() AS varchar(100)) +           
'XACT_STATE: ' + CAST(XACT_STATE() AS varchar(100))                                  
END CATCH                                  
 
END --procedure end                                       
/* 
<doc> Generates a C# class base on DataType conversion</doc>
*/
GO                            
/*           
Example usage:         
exec procUtils_GenerateClass 'PageType'
*/

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