Hi!
On Mon, Jun 16, 2014 at 08:50:44PM +0000, "Goldberg, Arthur P"
<[email protected]> wrote:
> Hi
>
> I'm just learning sqlobject and find it pretty neat!
Welcome!
> Suppose I have this:
> from sqlobject import *
>
> class Variant2(SQLObject):
> class sqlmeta:
> style = Style(longID=True)
> ref = StringCol()
> alt = StringCol()
> SubjectID = StringCol()
>
> class Subject2(SQLObject):
> FamilyID = StringCol()
> IndivID = StringCol( alternateID=True, length=50 ) # do not know if this
> is long enough
> Sex = StringCol()
>
> connection = connectionForURI(Minerva_URI)
> connection.debug = True
> sqlhub.processConnection = connection
> Variant2.dropTable( True, )
> Variant2.createTable()
> Subject2.dropTable( True, )
> Subject2.createTable()
>
> Variant2(
> ref = 'A',
> alt = 'C',
> SubjectID = 'Sub1' )
>
> Variant2(
> ref = 'A',
> alt = 'G',
> SubjectID = 'Sub2' )
>
> Subject2( FamilyID = '', IndivID = 'Sub1', Sex = '1' )
> Subject2( FamilyID = '', IndivID = 'Sub2', Sex = '2' )
>
> for var in Variant2.select(
> """ subject2.indiv_id = Variant2.SubjectID""",
> clauseTables=['subject2']):
> print var
>
> How would I generate a query that joins Variant2 and subject2? Like this:
>
> SELECT Variant2.Variant2_id, Variant2.ref, Variant2.alt, Variant2.AAC,
> Variant2.SubjectID, subject2.Sex FROM subject2, Variant2 WHERE
> subject2.indiv_id = Variant2.SubjectID;
for var in Variant2.select(Subject2.q.IndivID==Variant2.q.SubjectID):
print var
When you use magic .q. attributes SQLObject derives clauseTables
automatically; it lists all tables used in WHERE clause.
> Also, how could I define SubjectID as a foreign key that references indiv_id?
Alas, that much harder. Short answer is this (I show only relevant
changes):
class Variant2(SQLObject):
class sqlmeta:
idType = str
Subject = ForeignKey('Subject2', refColumn='IndivID')
'idType = str' is required because you want SubjectID to be a string
foreign key. But at the same time it changes the type of the 'id' column --
it also becomes TEXT and loses autoincrement property so you have to
assign it manually. The entire programs is now:
class Variant2(SQLObject):
class sqlmeta:
idType = str
style = Style(longID=True)
ref = StringCol()
alt = StringCol()
Subject = ForeignKey('Subject2', refColumn='IndivID')
class Subject2(SQLObject):
FamilyID = StringCol()
IndivID = StringCol( alternateID=True, length=50 ) # do not know if this
is long enough
Sex = StringCol()
Variant2.createTable()
Subject2.createTable()
Variant2(
id = '1',
ref = 'A',
alt = 'C',
SubjectID = 'Sub1' )
Variant2(
id = '2',
ref = 'A',
alt = 'G',
SubjectID = 'Sub2' )
Subject2( FamilyID = '', IndivID = 'Sub1', Sex = '1' )
Subject2( FamilyID = '', IndivID = 'Sub2', Sex = '2' )
for var in Variant2.select(Subject2.q.IndivID==Variant2.q.SubjectID):
print var
Oleg.
--
Oleg Broytman http://phdru.name/ [email protected]
Programmers don't die, they just GOSUB without RETURN.
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