How to import Mysql database in gzip format using batch file

@echo off
color 0a
title Backup MySQL databases in separate gzipped sql files
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echo º Mysql database backup in separate gzipped format º
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ECHO Please wait while system starts.
ping -n 3 -w 3000 0.0.0.1 > nul
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:: Batch file MySQL databases in separate gzipped sql files format::
:: Please install 7zip & set thair location.

set dbUser=root
set dbPassword=
set port=3306
set backupDir="D:\mysql"
set mysqldump="D:\xampp\mysql\bin\mysqldump.exe"
set mysqlDataDir="D:\xampp\mysql\data"
set zip="C:\Program Files\7-Zip\7z.exe"

: get date
for /F "tokens=1-3 delims=- " %%i in ('date /t') do (
set yy=%%i
set mon=%%j
set dd=%%k
)

:: get time
for /F "tokens=5-8 delims=:. " %%i in ('echo.^| time ^| find "current" ') do (
set hh=%%i
set min=%%j
)

echo dirName=%yy%%mon%%dd%_%hh%%min%

:: switch to the "data" folder
pushd %mysqlDataDir%

:: iterate over the folder structure in the "data" folder to get the databases
for /d %%f in (*) do (

if not exist %backupDir%\%dirName%\ (
mkdir %backupDir%\%dirName%
)

%mysqldump% --host="localhost" --user=%dbUser% --password=%dbPassword% --port=%port% --single-transaction --add-drop-table --databases %%f > %backupDir%\%dirName%\%%f.sql

%zip% a -tzip %backupDir%\%dirName%\%%f.sql.gz %backupDir%\%dirName%\%%f.sql

del %backupDir%\%dirName%\%%f.sql
)
popd