chcp 65001
echo off
cls

if exist output.sql (
    del output.sql
)
  for /f "tokens=*" %%v in ('dir /s/b/a-d *.sql /on') do ( 
echo.>>output.sql
echo ------------------==================== %%~nv%%~xv ====================----------------- >> output.sql
echo.>>output.sql
echo print '------------------==================== %%~nv%%~xv ====================-----------------' >> output.sql
echo GO>>output.sql
type "%%v" >> output.sql
rem for /f "usebackq delims=" %%j in ("%%~v") do echo %%j >> output.sql
rem copy /b output.sql+%%~nv%%~xv output.sql
echo.>>output.sql
echo.>>output.sql
echo GO>>output.sql
echo.>>output.sql
echo.>>output.sql
)

set src=output.sql

setlocal EnableDelayedExpansion

for /f "delims=" %%t in ('type "%src%"^& del /F "%src%"') do (
  set str=%%t
  call set str=%%str:?=%%
  call echo %%str%%>>"%src%"
)