Hi there!
I have a few tables:
db.trucks (id, num ...)
db.operations (id, truck_id ...)
db.controls (id, operation_id ...)
There is one to many relation: unique db.trucks.num corresponds to many
operations and the only db.operations.id corresponds to many controls.
I can do search all *operations* with exact truck number this way:
*rows1 =
db(db.trucks.num.like('%'+str(request.vars.truck)+'%')).select(join=db.operations.on(db.trucks.id
== db.operations.truck_id), orderby=~db.operations.id, limitby=limitby)*
And then I easily can export the rows to *.xls file - one excell sheet for
selected operations by truck number.
It works fine, but not so well if I need to add another sheet to that *.xls
and export new set containing all *controls* belonging to selected before
*operations*.
*rows2 =
db(db.trucks.num.like('%'+str(request.vars.truck)+'%')).select(join=db.operations.on(db.trucks.id
== db.operations.truck_id), left=db.controls.on(db.controls.operation_id ==
db.operations.id), orderby=~db.operations.id)*
So, there are two queries to fill two excell work sheets. And now I have to
show only *rows1* into the corresponding view but *rows2* is only for
export to *.xls.
To perform the export I call another def with thoose two selects. For now
there are 4 selects.
I guess I can reduce number of queries. Can somebody give me a clue of how
to export selected rows without another selects?
Por favor amigos!!!
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