TSQL - Drop constraints dynamically

gistfile1.sql

--Check if exist foreing keys for determinated table
IF EXISTS(SELECT  C.name
		FROM { OKW.SYS.foreign_keys | OKW.SYS.default_constraints} C
		INNER JOIN OKW.SYS.tables T ON C.parent_object_id = T.object_id
		INNER JOIN OKW.SYS.schemas S ON T.schema_id = S.schema_id
		WHERE T.name = 'MyTable')
		BEGIN

			DECLARE @CADENA NVARCHAR(MAX)
			SET @CADENA = ''
			
			DECLARE @LINEA NVARCHAR(255)
			
			DECLARE cGen CURSOR FOR
				SELECT  ' ALTER TABLE ' + S.name + '.' + T.name + ' DROP CONSTRAINT ' + C.name 	AS 'LINEA_SELECT'
				FROM { OKW.SYS.foreign_keys | OKW.SYS.default_constraints} C
				INNER JOIN OKW.SYS.tables T ON C.parent_object_id = T.object_id
				INNER JOIN OKW.SYS.schemas S ON T.schema_id = S.schema_id
				WHERE T.name = 'MyTable'
			
			OPEN cGEN
			   
			FETCH cGEN INTO @LINEA
			
			WHILE(@@FETCH_STATUS = 0)
			BEGIN
				
				SET @CADENA = @CADENA + @LINEA
				
				FETCH cGEN INTO @LINEA
				
			END
			
			CLOSE cGEN
			
			DEALLOCATE cGEN
										       
			EXEC(@CADENA)

		END