delete existing store procedure and tables

Delete all existing database use this scripts.
    

DECLARE @Sql NVARCHAR(500) DECLARE @Cursor CURSOR
SET @Cursor = CURSOR FAST_FORWARD FOR
SELECT DISTINCT sql = 'ALTER TABLE [' + tc2.TABLE_NAME + '] DROP [' + rc1.CONSTRAINT_NAME + ']'
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc2 ON tc2.CONSTRAINT_NAME =rc1.CONSTRAINT_NAME
OPEN @Cursor FETCH NEXT FROM @Cursor INTO @Sql
WHILE (@@FETCH_STATUS = 0)
BEGIN
Exec SP_EXECUTESQL @Sql
FETCH NEXT FROM @Cursor INTO @Sql
END
CLOSE @Cursor DEALLOCATE @Cursor
GO
EXEC sp_MSForEachTable 'DROP TABLE ?
GO



if you want to delete all existing store procedure use this scripts.

DECLARE @procedureName varchar(500)
DECLARE cur CURSOR
      FOR SELECT [name] FROM sys.objects WHERE type = 'p'
      OPEN cur

      FETCH NEXT FROM cur INTO @procedureName
      WHILE @@fetch_status = 0
      BEGIN
            EXEC('DROP PROCEDURE ' + @procedureName)
            FETCH NEXT FROM cur INTO @procedureName
      END
      CLOSE cur
      DEALLOCATE cur

Hope it will help you :)