On Thursday, January 18, 2018 at 11:49:39 AM UTC-6, Mike Bayer wrote: > > > > On Thu, Jan 18, 2018 at 12:31 PM, Lukasz Szybalski <szyb...@gmail.com > <javascript:>> wrote: > >> Hello, >> I have a query in sqlalchemy like below where I lookup contract# in >> mssql. How do I enforce the varchar instead of nvarchar? I tried converting >> my field to "str(mycurrent)" but that didn't do anything. Is there some >> other spot to force VARCHAR to be sent? >> > > > this just came up in > https://bitbucket.org/zzzeek/sqlalchemy/issues/4161/sql-server-string-use-case, > > in that case they are using typed parameters: > > String(50, convert_unicode='force') > > if you're dealing w/ the raw string like that try this: > > execute(text("select ... where foo = > :mycurrent").bindparams(bindparam("mycurrent", > type_=String(convert_unicode='force'))) > > let me know if that works b.c. this has to be in the docs >
Hello, Sorry for late response. I'm struggling with the syntax here for the bind param. How do I convert from session.execut(stmt,params) to your bindparams? I can't just cast the variable I'm passing to correct format? Knowing that the value I will be passing is either some sa stored procedure sqlalchemy object.columname or some other system mycontract=someobject.contract_no From p=session.execute("select PZ.p_id,PZ.pimage_num from dbo.P with(nolock) inner join dbo.PZ PZ with(nolock) on PZ.p_id = p.p_id inner join dbo.D D with(nolock) on D.p_id = p.p_id AND D.pimage_num=PZ.pimage_num where p.contract=:mycontract and D.srtype_id =5",params={'mycontract':str(mycontract)}).fetchall() To: from sqlalchmy import bindparams ##mycurrent=someobject.contract_no mycurrent='ABC123' (bad) p=session.execute(text("select PZ.p_id,PZ.pimage_num from dbo.P with(nolock) inner join dbo.PZ PZ with(nolock) on PZ.p_id = p.p_id inner join dbo.D D with(nolock) on D.p_id = p.p_id AND D.pimage_num=PZ.pimage_num where p.contract=:mycontract and D.srtype_id =5").bindparam('mycontract'),params={'mycontract':str(mycontract)}).fetchall() AttributeError: 'TextClause' object has no attribute 'bindparam' (bad) p=session.execute("select PZ.p_id,PZ.pimage_num from dbo.P with(nolock) inner join dbo.PZ PZ with(nolock) on PZ.p_id = p.p_id inner join dbo.D D with(nolock) on D.p_id = p.p_id AND D.pimage_num=PZ.pimage_num where p.contract=:mycontract and D.srtype_id =5").bindparam('mycontract').fetchall() A value is required for bind parameter 'mycontract' - What is the final working syntax, I can't find any examples of how to fix this in the link <https://bitbucket.org/zzzeek/sqlalchemy/issues/4161/sql-server-string-use-case> indicated. Page says that a "String(50).with_variant(String(50, convert_unicode='force'), 'mssql')" has worked for Jan K. but it doesn't really say how does somebody converts their variable into correct type string: like: mycontract=cast(mycontract, String(convert_unicode='force')) Since I'm passing params right after my statement should the bindparam be in params section? something along: params={'mycontract':sqlalchemy.string(mycontract).convert_unicode='force')}) The easiest way would be to convert mycontract into proper String(convert_unicode='force') and pass mycontract as in my original query? Thank you Lucas __ http://lucasmanual.com > >> >> You can find that the query that uses NVARCHAR does an index scan has >> 30,909 logical reads on the dbo.P table. It also uses 890 ms of CPU and >> has a total elapsed time of 938 ms. >> >> The query that uses VARCHAR does an index seek and has 7 logical reads on >> the dbo.P table. It uses 0 ms of CPU and has a total elapsed time of 11 ms. >> >> >> p=*session.execute*("select PZ.p_id,PZ.pimage_num from dbo.P >> with(nolock) inner join dbo.PZ PZ with(nolock) on PZ.p_id = p.p_id inner >> join dbo.D D with(nolock) on D.p_id = p.p_id AND D.pimage_num=PZ.pimage_num >> where p.current=:mycurrent and D.srtype_id >> =5",params={'mycurrent':str(mycurrent)}).fetchall() >> >> >> >> >> >> [image: Inline image 1] >> >> >> >> >> Thank you >> >> Lucas >> >> >> >> >> -- >> http://lucasmanual.com/ <http://lucasmanual.com/blog/> >> >> -- >> SQLAlchemy - >> The Python SQL Toolkit and Object Relational Mapper >> >> http://www.sqlalchemy.org/ >> >> To post example code, please provide an MCVE: Minimal, Complete, and >> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >> description. >> --- >> You received this message because you are subscribed to the Google Groups >> "sqlalchemy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sqlalchemy+...@googlegroups.com <javascript:>. >> To post to this group, send email to sqlal...@googlegroups.com >> <javascript:>. >> Visit this group at https://groups.google.com/group/sqlalchemy. >> For more options, visit https://groups.google.com/d/optout. >> > > -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.