For completeness, let me assume you have more than one playlist:
db.define_table('playlist',Field('playlist_name',),
Field('title','string'),
Field('start_time','integer'),
Field('duration','integer')
)
def insert_after(record, new_record):
query = db.playlist.playlist_title==record.playlist_title
if record: query &= (db.playlist.start_time>record.start_time)
db(query).update(start_time=db.playlist.start_time+new_record['duration'])
db.playlist.insert(**new_record)
insert_after(db.playlist(nnn), {'playlist_title':..., 'title':...,
start_time:..., duration:...})
On Saturday, 18 January 2014 15:19:38 UTC-6, Jaime Sempere wrote:
>
>
> Hi everyone,
>
> Although I have used database serveral times, I have not done anything
> beyond very basic, so I am wondering what would be the best practice for
> this case:
>
>
> I have a database table for storing a 'real-time' playlist of songs like
> this:
>
> db.define_table('playlist',Field('title','string'),
> Field('start_time','integer'),
> Field('duration','integer')
> )
>
> For example:
>
> row 0: Title: Imagine ; start
> time: 0:00 ; duration 3:43
> row 1: Title: My way ; start
> time: 3:43 ; duration 4:00
> row 2: Title: I feel good ; start time:
> 7:43 ; duration 4:00
>
>
> As you see, start time of every song stands for the 'real time' at which
> the song will be played.
>
> What I need to know is the best approach in web2py for insert a new row in
> the middle of the table and update songs below.
>
> Example, say that I add, "my song" between 0 and 1:
>
> row 0: Title: Imagine ; start
> time: 0:00 ; duration 3:43
> row 1: Title: My Song ; start
> time: 3:43 ; duration 3:00
> row 2: Title: My way ; start
> time: 7:43 ; duration 4:00
> row 3: Title: I feel good ; start time:
> 11:43 ; duration 4:00
>
> I need to update and change start times for old rows 1 and 2...
>
> I have never face this kind of problem but I have seen that in a SQL
> triggers could do the update. How could I approach this problem in web2py?
>
> Thanks in advance
>
> PS: I forgot to say, this is only an example, the number of total rows in
> my database could be large (say from 1.000 to 10.000).
>
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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