conditions = [db.User.id==id] if user_name != ' ': conditions.append(db.User.name == user_name) elif age != ' ': conditions.append(db.User.age == age) elif place != ' ': conditions.append(db.User.place == place)
result = db.User.filter(and_(*conditions)).all() might do the trick (untested). On Thu, Dec 22, 2011 at 9:53 AM, Sana klh <sana.kl...@gmail.com> wrote: > Hi Robert Forkel, > > You got it right i am trying to have a combination of expression combined in > and_. > > I need to add the attribute only when it is not equal to null.So i tried to > check if it is not null and then from the expression and pass it to filter > .But this does not work. > > I went through the document but unable to figure out how to do this through > sql. > > > Thank you > > On Thu, Dec 22, 2011 at 12:11 PM, Robert Forkel <xrotw...@googlemail.com> > wrote: >> >> You may want to look at the tutorial [1]. In the code you pasted you >> are assembling a string to pass to filter. While you can do that (but >> then it should be proper sql not python!), what you want to do is >> passing a python expression like db.User.age==age, or a combination of >> expressions combined using and_, or_, etc. >> >> [1] >> http://www.sqlalchemy.org/docs/orm/tutorial.html#common-filter-operators >> >> On Thu, Dec 22, 2011 at 6:34 AM, Sana klh <sana.kl...@gmail.com> wrote: >> > I am getting the following error >> > >> > ProgrammingError: (ProgrammingError) (1064, "You have an error in your >> > SQL >> > syntax; check the manual that corresponds to your MySQL server version >> > for >> > the right syntax to use near '== 1,db.User.age==23,d' at line 3") >> > >> > >> > Is there any way by which i can generate dynamic query? >> > >> > Thank you >> > Sana >> > >> > >> > >> > On Thu, Dec 22, 2011 at 4:40 AM, Jackson, Cameron >> > <cameron.jack...@thalesgroup.com.au> wrote: >> >> >> >> You might get more help if you provide more details. What error are you >> >> getting? >> >> >> >> -----Original Message----- >> >> From: sqlalchemy@googlegroups.com [mailto:sqlalchemy@googlegroups.com] >> >> On >> >> Behalf Of Sana >> >> Sent: Thursday, 22 December 2011 2:50 AM >> >> To: sqlalchemy >> >> Subject: [sqlalchemy] SqlAlchemy dynamic query generation >> >> >> >> Hi All, >> >> >> >> I am trying to do query based on the user input as follows >> >> >> >> condition = 'and_(db.User.id == id' >> >> if user_name != ' ': >> >> condition += ',db.User.name == user_name' >> >> elif age != ' ': >> >> condition += ',db.User.age == age' >> >> elif place != ' ': >> >> condition += ',db.User.place == place' >> >> >> >> where = condition+')' >> >> >> >> result = db.User.filter(where).all() >> >> >> >> >> >> But Im getting error when i do this. >> >> >> >> Is there any way by which i can do this >> >> >> >> >> >> Thank you >> >> Sana >> >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups >> >> "sqlalchemy" group. >> >> To post to this group, send email to sqlalchemy@googlegroups.com. >> >> To unsubscribe from this group, send email to >> >> sqlalchemy+unsubscr...@googlegroups.com. >> >> For more options, visit this group at >> >> http://groups.google.com/group/sqlalchemy?hl=en. >> >> >> >> >> >> >> >> >> >> ------------------------------------------------------------------------- >> >> DISCLAIMER: This e-mail transmission and any documents, files and >> >> previous e-mail messages attached to it are private and confidential. >> >> They may contain proprietary or copyright material or information that >> >> is subject to legal professional privilege. 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