How to fetch local db in android apps?

Steps to get local db in android apps:

:: For copy database file to desktop and get permission

adb shell 

run-as com.utryfirst.student  
chmod 666 databases/pencil_local_db.db  

exit

cp /data/data/com.utryfirst.student/databases/pencil_local_db.db /sdcard/
run-as com.utryfirst.student  

chmod 600 databases/pencil_local_db.db  
exit

exit
adb pull /sdcard/pencil_local_db.db