sp_truncate

,

sp_truncate <table_2_truncate>

I've created this procedure several months ago and I hope it would be helpful.

It truncates the table even those which are referenced by some other tables' foreign keys.

We shall truncate the table test1 which is referenced by e.g. 2 tables (test2,test3)

Then we execute sp_truncate test1 

 

Hope it will save you lots of time like it did for me.

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[sp_truncate]
@pkey_table_name VARCHAR(256)
AS
BEGIN
       IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'#fkey_tables') 
       AND type in (N'S'))
           DROP TABLE #fkey_tables;

       DECLARE
           @col_name VARCHAR(128),
           @pkey_col_name VARCHAR(128),
           @fkey VARCHAR(128),
           @ref_table VARCHAR(128),
           @fkey_col VARCHAR(128),
           @sql NVARCHAR(512),
           @sql_check NVARCHAR(128),
           @num_of_fkeys TINYINT;

           SELECT
               --ss1.name+'.'+
               so1.name [fkey_table]
               ,sc1.name [fkey_column]
               ,sfk.name [fkey_name]
               --,ss.name+'.'+
               ,so.name [pkey_table]
               ,sc.name [pkey_column]
           INTO #fkey_tables
           FROM
                sys.foreign_keys sfk
                INNER JOIN sys.foreign_key_columns sfkc
                ON sfk.object_id=sfkc.constraint_object_id
                INNER JOIN sys.objects so
                ON so.object_id=sfk.referenced_object_id
                --INNER JOIN sys.schemas ss
                --ON so.schema_id=ss.schema_id
                INNER JOIN sys.columns sc
                ON sc.object_id=so.object_id
                AND sc.column_id=sfkc.referenced_column_id
                INNER JOIN  sys.objects so1
                ON so1.object_id=sfkc.parent_object_id
                INNER JOIN sys.columns sc1
                ON sc1.object_id=so1.object_id
                AND sc1.column_id=sfkc.parent_column_id
                --INNER JOIN sys.schemas ss1
                --ON so1.schema_id=ss1.schema_id
           WHERE so.name=@pkey_table_name



           SELECT [fkey_table],[fkey_name],COUNT(*) AS [num]
           INTO #ref_data
           FROM #fkey_tables
           GROUP BY fkey_table,fkey_name;
              
           
           DECLARE a_cur CURSOR STATIC FOR
           SELECT
                [fkey_table],
                [fkey_name],
                [num]
           FROM #ref_data;

           OPEN a_cur;
           FETCH NEXT FROM a_cur INTO
                @ref_table,
                @fkey,
                @num_of_fkeys;
           
           WHILE (@@fetch_status=0)
           BEGIN
           IF  EXISTS (SELECT * FROM sys.foreign_keys WHERE object_id = OBJECT_ID(@fkey) 
           AND parent_object_id = OBJECT_ID(@ref_table))                  
	   BEGIN
                SET @sql = N'ALTER TABLE '+@ref_table+' DROP CONSTRAINT '+ @fkey;
				PRINT @sql;
				EXEC sp_executesql @sql;
           END;   
             
           FETCH NEXT FROM a_cur INTO
                @ref_table,
                @fkey,
                @num_of_fkeys;

           END;
           CLOSE a_cur;
           


           SET @sql=N'truncate table '+ @pkey_table_name;
           PRINT @sql;
           EXEC sp_executesql @sql;

           DECLARE @from_tbl varchar(256),
	       @fkeyn varchar(256),
               @n tinyint;
        
           DECLARE b_cur CURSOR STATIC FOR
           SELECT
              [pkey_table],
              [pkey_column],
              [fkey_name],
              [fkey_table],
              [fkey_column]
           FROM #fkey_tables;

           OPEN b_cur
           FETCH NEXT FROM b_cur
              INTO
              @pkey_table_name,
              @pkey_col_name,
              @fkey,
              @ref_table,
              @fkey_col;



	   OPEN a_cur;

           WHILE (@@fetch_status=0)
           BEGIN

             
           FETCH NEXT FROM a_cur INTO
               @from_tbl,
               @fkeyn,
               @n;
                              
           WHILE (@@fetch_status=0)
           BEGIN
           
           
           IF NOT EXISTS (SELECT * FROM sys.foreign_keys WHERE object_id = OBJECT_ID(@fkeyn)
							AND parent_object_id = OBJECT_ID(@from_tbl)) 
	   BEGIN 
						
           IF (@n>1)
               BEGIN



                       
               SET @fkey_col=''
               SET @pkey_col_name=''
                         
               SELECT @fkey_col=ISNULL(@fkey_col+',','')+[fkey_column],
               @pkey_col_name=ISNULL(@pkey_col_name+',','')+[pkey_column]
               FROM  #fkey_tables
               WHERE [fkey_name]=@fkeyn;
                         
               SET @fkey_col=substring(@fkey_col,2,len(@fkey_col))
               SET @pkey_col_name=substring(@pkey_col_name,2,len(@fkey_col))
                      
               SET @sql = N'ALTER TABLE '+ @from_tbl+' WITH NOCHECK ADD CONSTRAINT '+ @fkeyn +' FOREIGN KEY('+@fkey_col+')
               REFERENCES '+ @pkey_table_name+'('+@pkey_col_name+')';
               SET @sql_check=N'ALTER TABLE '+ @from_tbl+' CHECK CONSTRAINT ALL';                                                                
               END;                         
               ELSE
               BEGIN                                                                      
			
			   SELECT @fkey_col=[fkey_column],
			   @pkey_col_name=[pkey_column]
			   FROM  #fkey_tables
			   WHERE [fkey_name]=@fkeyn;
			   SET @sql = N'alter table '+ @from_tbl +' WITH NOCHECK ADD CONSTRAINT '+ @fkeyn +' FOREIGN KEY('+@fkey_col+')
			   REFERENCES '+ @pkey_table_name+'('+@pkey_col_name+')';
			   SET @sql_check=N'ALTER TABLE '+ @from_tbl+' CHECK CONSTRAINT ALL';
	       END;
           print @sql;
           EXEC sp_executesql @sql;
           print @sql_check;
           EXEC sp_executesql @sql_check;
           END;                 
           ELSE
           BEGIN
               print 'Foreign Key Already Exists'
               print 'FKey name'+@fkeyn+' '+OBJECT_ID(@fkeyn)
               print 'Referencing table'+@from_tbl+' '+OBJECT_ID(@from_tbl)              
           END;
               FETCH NEXT FROM a_cur INTO
               @from_tbl,
               @fkeyn,
               @n;
           END;
               FETCH NEXT FROM b_cur INTO
               @pkey_table_name,
               @pkey_col_name,
               @fkey,
               @ref_table,
               @fkey_col;

           END;
           CLOSE b_cur;
           CLOSE a_cur;
           DEALLOCATE b_cur;
           DEALLOCATE a_cur;

           END;

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