Yeah i've been watching it for a while; not that there is anything wrong with mapper / jpa, but ScalaQuery appears to be a more functional design and the whole "its not an ORM" thing that is favoured by quite a number of people makes it very interesting indeed.
Cheers, Tim On 11 Jan 2010, at 18:38, Joni Freeman wrote: > Tim, > > ScalaQuery is a great DSL to interface relational database and to > construct type safe SQL queries. I find that kind of approach often > preferable compared to full blown ORMs (like Hibernate etc.) since it > gives full control over SQL queries and does not impose any > constraints on object model. > > At the moment it is a bit difficult to use ScalaQuery with Lift since > latest versions of ScalaQuery requires Scala 2.8. But once Lift is > fully on 2.8 there should be no problems at all in using it in Lift > app. ScalaQuery is still work in progress and there hasn't been any > official release as far as I know, the documentation is also severely > lacking. > > Cheers Joni > > On 11 tammi, 13:32, Timothy Perrett <timo...@getintheloop.eu> wrote: >> Hey Joni, >> >> What did you think of ScalaQuery btw? Have you used it inside a lift app? >> >> Cheers, Tim >> >> On 11 Jan 2010, at 11:07, Joni Freeman wrote: >> >>> Ok, thanks for clarification. Unfortunately my knowledge about mapper >>> is very limited (I've previously used ScalaQuery for db persistence). >>> Maybe someone else can answer the question better, the question being: >>> What is the easiest way to store instances of Observations into >>> database using mapper. >> >>> case class Observation(notice: List[Notice], header: List[Header], >>> data: List[Data]) >> >>> Notice, Header and Data are simple case classes having just primitive >>> fields. >> >>> Cheers Joni >> >>> On 11 tammi, 10:36, Randinn <rand...@gmail.com> wrote: >>>> Sorry for the confusion Observation is a table actually, I meant to >>>> write mapper. So what we're doing is calling up thejsonfile, making >>>> it a string, putting it through the parcer and inserting it into the >>>> table. >> >>>> On Jan 11, 5:49 pm, Joni Freeman <freeman.j...@gmail.com> wrote: >> >>>>> Hi, >> >>>>> I'm sorry but I'm not totally sure what you are trying to accomplish. >>>>> What would be the key in that map and what would be its values? >> >>>>> Cheers Joni >> >>>>> On 11 tammi, 03:14, Randinn <rand...@gmail.com> wrote: >> >>>>>> I should explain what we are planning, the idea is to get thejson >>>>>> file into a string, parse it and save the caught information into a >>>>>> Observation map. >> >>>>>> On Jan 11, 11:23 am, Randinn <rand...@gmail.com> wrote: >> >>>>>>> Forgive my ignorance but I was wondering why (json\ >>>>>>> "observations").extract[Observation], is it to save as a flat file? >> >>>>>>> On Jan 4, 7:13 am, Randinn <rand...@gmail.com> wrote: >> >>>>>>>> I tried some of the changes you made but not all of them, and (json\ >>>>>>>> "observations").extract[Observation], I had no idea about that one. >>>>>>>> Thank you very much for your help, it is appreciated. >> >>>>>>>> On Jan 4, 1:00 am, Joni Freeman <freeman.j...@gmail.com> wrote: >> >>>>>>>>> Google Groups does not shine in formatting code snippets. Here's nicer >>>>>>>>> version: >> >>>>>>>>> http://paste.pocoo.org/show/161578/ >> >>>>>>>>> Cheers Joni >> >>>>>>>>> On 3 tammi, 12:20, Joni Freeman <freeman.j...@gmail.com> wrote: >> >>>>>>>>>> Hi, >> >>>>>>>>>> That's almost correct. I did following changes after looking intoJSON >>>>>>>>>> content. >> >>>>>>>>>> 1. 'notice' and 'header' areJSONarrays just like 'data'. Therefore: >>>>>>>>>> case class Observation(notice: List[Notice], header: List[Header], >>>>>>>>>> data: List[Data]) >> >>>>>>>>>> 2. There's optional data inJSON(some datapoints are nulls and Scala >>>>>>>>>> Int or Double can't take null values). This can be fixed by >>>>>>>>>> extracting >>>>>>>>>> into Option. >> >>>>>>>>>> 3. The extracted Observation is inJSONfield 'observations'. >>>>>>>>>> Therefore: >>>>>>>>>> (json\ "observations").extract[Observation] >> >>>>>>>>>> Your error stack trace suggests that you have an old version of lift- >>>>>>>>>> json. Please upgrade to M8, there was a critical bug in case class >>>>>>>>>> extraction in older versions. >> >>>>>>>>>> Full example which works for me: >> >>>>>>>>>> implicit val formats = net.liftweb.json.DefaultFormats >>>>>>>>>> case class Notice(copyright: String, copyright_url: String, >>>>>>>>>> disclaimer_url: String) >>>>>>>>>> case class Header(refresh_message: String, ID: String, main_ID: >>>>>>>>>> String, name: String, state_time_zone: String, time_zone: String, >>>>>>>>>> product_name: String, state: String) >>>>>>>>>> case class Data(sort_order: Int, wmo: Int, history_product: String, >>>>>>>>>> local_date_time: String, >>>>>>>>>> local_date_time_full: String, air_temp: Option >>>>>>>>>> [Double], dewpt: Option[Double], apparent_t: Option[Double], >>>>>>>>>> rel_hum: Option[Int], delta_t: Option[Double], >>>>>>>>>> wind_dir: String, wind_spd_kt: Option[Double], gust_kt: Option >>>>>>>>>> [Double], >>>>>>>>>> wind_spd_kmh: Option[Double], press: >>>>>>>>>> Option[Double], >>>>>>>>>> rain_trace: String) >> >>>>>>>>>> case class Observation(notice: List[Notice], header: List[Header], >>>>>>>>>> data: List[Data]) >> >>>>>>>>>> (json\ "observations").extract[Observation] >> >>>>>>>>>> Cheers Joni >> >>>>>>>>>> On 3 tammi, 09:17, Randinn <rand...@gmail.com> wrote: >> >>>>>>>>>>> I'm having a bit of trouble with LiftJsonparcing, I know I'm not >>>>>>>>>>> doing it correctly but looking at the examples I cannot figure out >>>>>>>>>>> what, anyway, here is the code in question..... If someone could >>>>>>>>>>> point >>>>>>>>>>> me in the right direction that would be great, thanks in advance. >> >>>>>>>>>>> class HelloWorld { >>>>>>>>>>> def howdy = <span>Welcome to hello-lift at {new >>>>>>>>>>> _root_.java.util.Date}</span> >>>>>>>>>>> val http = new Http >>>>>>>>>>> val bos = new ByteArrayOutputStream >>>>>>>>>>> val myRequest = new Request("http://www.bom.gov.au/fwo/IDV60901/ >>>>>>>>>>> IDV60901.94868.json") >>>>>>>>>>> val rawdata = http(myRequest >>> bos) >>>>>>>>>>> val bs = bos.toString >>>>>>>>>>> val db = :/("www.bom.gov.au") >> >>>>>>>>>>> valjson= parse(bs) >> >>>>>>>>>>> implicit val formats = net.liftweb.json.DefaultFormats >>>>>>>>>>> case class Notice(copyright: String, copyright_url: String, >>>>>>>>>>> disclaimer_url: String) >>>>>>>>>>> case class Header(refresh_message: String, ID: String, main_ID: >>>>>>>>>>> String, name: String, state_time_zone: String, >>>>>>>>>>> time_zone: String, product_name: String, state: >>>>>>>>>>> String) >>>>>>>>>>> case class Data(sort_order: Int, wmo: Int, history_product: >>>>>>>>>>> String, >>>>>>>>>>> local_date_time: String, >>>>>>>>>>> local_date_time_full: Int, air_temp: Double, >>>>>>>>>>> dewpt: >>>>>>>>>>> Double, apparent_t: Double, >>>>>>>>>>> rel_hum: Double, delta_t: Double, wind_dir: >>>>>>>>>>> Double, >>>>>>>>>>> wind_spd_kt: Double, gust_kt: Double, >>>>>>>>>>> wind_spd_kmh: Double, press: Double, rain_trace: >>>>>>>>>>> Double) >>>>>>>>>>> case class Observation(notice: Notice, header: Header, data: List >>>>>>>>>>> [Data]) >>>>>>>>>>> json.extract[Observation] >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Lift" group. >>> To post to this group, send email to lift...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> liftweb+unsubscr...@googlegroups.com. >>> For more options, visit this group >>> athttp://groups.google.com/group/liftweb?hl=en. > -- > You received this message because you are subscribed to the Google Groups > "Lift" group. > To post to this group, send email to lift...@googlegroups.com. > To unsubscribe from this group, send email to > liftweb+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/liftweb?hl=en. > >
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