在两次之间插入持续时间..在mysql中

Question

I am inserting two time values in the mysql database columns TIME1 and TIME2 respectively and at the same time i also want the duration between the two times to be calculated and be inserted into a DURATION named column..I tried some sub queries but being weak with database coding i am not able to do this..Also Queries are being written in the java classes not in sql command line..Values are supposed to be entered in the same database..

Insert into meeting_hall_booking_master(booking_duration)
select TIMEDIFF(booking_to_time,booking_from_time) from meeting_hall_booking_master;

This query inserts a new row with the booking duration calulated with the help of the values of TIME1 and TIME2 of its previous row.

Answer 1

Use update statement it will solve your problem

update meeting_hall_booking_master 
set booking_duration = TIMEDIFF(booking_to_time,booking_from_time);

Answer 2

It seems you actually need an update statement now.

update meeting_hall_booking_master
 set booking_duration = TIMEDIFF( booking_to_time, booking_from_time )

Instead of updating on a later stage, you can set the duration value in the insert statement.

insert into 
 meeting_hall_booking_master( booking_to_time, booking_from_time, booking_duration )
 values ( @booking_to_time,
          @booking_from_time,
          timediff( @booking_to_time, @booking_from_time )
        )