At 15.36 24/10/2007, Sandy Young wrote: >Hi, Andrea > >A single object is different from a list. I have read some articles before >2007 through search engine, they point out lazyload is just for properties >that in list type. Then I find that DataMapper-1.6.1 support both concrete >class and IList in ãData Mapper Guide-1.6.1.chmã:
Yes you are completely right. I'm used to lazy-load just lists (one-to-many) and right now I cannot remember a recent project with a lazy-load of a concrete object (maybe I'm used to load it manually). Andrea >//////////3.5.4.9. lazyLoad >Lazy loading is supported transparently for IList and IList<T> implementation. > >Lazy loading is supported on strongly typed collection via Castle.DynamicProxy >component. In this case you must set the listClass attribute and declare all >methods/properties of the typed collection that you want to proxy as virtual. > >Lazy loading is supported on concrete class via Castle.DynamicProxy component. >In this case, you must declare all methods/properties of the class that you >want to proxy as virtual. >///////// > >But when I tried the feature (support concrete class), I failed even when I >did what the doc told to do (such as declare the properties as virtual method >and so on). As you see, I don't think my code or config is wrong, but it just >doesn't work. I also can't find an correct example. If you can, could you >please make a small example and mail me? It would be a big help for me. > >BTW: Please forgive my bad english. I am from China. > > Andy > > >On 10/24/07, Andrea Tassinari <<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]> >wrote: >At 11.29 24/10/2007, Sandy Young wrote: > >>Hi, Andrea >> >> >>Thanks you very much for your reply! >> >>But my work is different from yours. In my project, object subj to object reg >>is one-to-many relationship. So subj is a single object, not a IList. > >that should make no difference because a single object is a particular case of >a list from the perspective of iBatis lazy load. > >I can't see anything wrong in your map except this little typo (note the space >in the select attribute: > ><result property="Subj" column="SubjID" lazyLoad="true" select=" Subj.Find" /> > >but if Subj.Find is a valid statement mapped to the same Type of the property >Subj of class Reg, I can't see anything wrong. Remember that the object is >lazy-loaded when a property of it is actually accessed, that is: > >Reg reg = ... //load from Database via ibatis, lets assume reg is not null now. >Reg newReg = new Reg(); //instantiate a new reg object (just for the example) > >newReg.Subj = reg.Subj //this DOES NOT fire lazy load >int dummy = reg.Subj.SubjId //this DOES fire lazy load, assuming SubjId is a >property of class Subj > >Andrea > > >>My configs are just like below: >> >>////In Reg.config: >> >><resultMaps> >> <resultMap id="SelectAllResult" class="Reg"> >> <result property="SeqId" column="SeqId"/> >> <result property="UserID" column="UserID"/> >> <result property="HoldScoreKind" column="HoldScoreKind"/> >> <result property="IsTrain" column="IsTrain"/> >> <result property="SubjID" column="SubjID"/> >> <result property="FeeAffirm" column="FeeAffirm"/> >> <result property="AffirmTime" column="AffirmTime"/> >> </resultMap> >> <resultMap id="SelectAllResultExtent" class="Reg" >> extends="SelectAllResult"> >> <result property="User" column="UserID" lazyLoad="true" >> select="User.Find" /> >> <result property="Subj" column="SubjID" lazyLoad="true" select=" >> Subj.Find" /> >> </resultMap> >> </resultMaps> >> >>/////In Subj.config: >> >><select id="FindAll" resultMap="SelectAllResultExtent"> >> SELECT >> * >> FROM [Subj] >> </select> >><select id="Find" parameterClass="int?" resultMap="SelectAllResultExtent" >>extends="FindAll"> >> WHERE >> [Subj].[ID] = #value# >> </select> >> >> Andy >> >>On 10/24/07, Andrea Tassinari <<mailto:[EMAIL PROTECTED] ><mailto:[EMAIL >>PROTECTED]>[EMAIL PROTECTED] > wrote: >>Hi, >> >>I am currently using DataMapper 1.6.1 and lazy load works great. >> >>One example: >> >>1) result Map for object Lotto containing a 1-to-many relationship mapped in >>my domain with a List<Cantina> >> >><result property="Cantine" column="Id" select="SelectCantinaByLottoId" >>lazyLoad="true"/> >> >>Stupid question: did you specified a resultMap *not* a resultClass in the >>select statement? >> >><!--Wrong version lazy load not involved --> >><select id="SelectLottoById" parameterClass="string" resultClass="Lotto"> >> <include refid="SelectLotto_BaseSQL" /> >> <dynamic prepend="WHERE"> >> <isParameterPresent>Id = #value#</isParameterPresent> >> </dynamic> >></select> >> >><!--Correct version lazy load fired --> >><select id="SelectLottoById" parameterClass="string" resultMap="LottoResMap"> >> <include refid="SelectLotto_BaseSQL" /> >> <dynamic prepend="WHERE"> >> <isParameterPresent>Id = #value#</isParameterPresent> >> </dynamic> >></select> >> >> >>Hope this helps >> >>Andrea >> >>At 10.38 24/10/2007, Sandy Young wrote: >> >>>When I use DataMapper-1.6.1 instead of DataMapper-1.5.1, I find the lazyload >>>function doesn't work. >>> If I replace DataMapper-1.6.1 with older DataMapper-1.5.1, it works. >>> I find this bug is reported as a bug in >>> <<<http://ibatis.net>http://ibatis.net>http://ibatis.net>< >>> <http://ibatis.net>http://ibatis.net><http://ibatis.net>ibatis.net's Issue >>> Tracker. >>>Is there anybody can fix it? >>>Thank you! >>> >>>My code: >>> >>>IRegDao dao = new RegDao(); >>> Reg reg = dao.Find(1); >>> Console.WriteLine("Reg:"); >>> Console.WriteLine("SeqId:{0}", reg.SeqId); >>> Console.WriteLine("SubjID:{0}\tName:{1}", reg.SubjID, >>> <<<http://reg.Subj.Name>http://reg.Subj.Name>http://reg.Subj.Name>< >>> http://reg.Subj.Name>reg.Subj.Name); >>> >>>///class Reg >>>public partial class Reg >>> { >>> #region Private Member >>> private int? _SubjID; >>> #endregion >>> >>> #region Private Extend Member >>> private Subj _Subj; >>> #endregion >>> >>> #region Constructor >>> public Reg() >>> { >>> } >>> #endregion >>> >>> #region Public Properties >>> public int? SubjID >>> { >>> get {return _SubjID;} >>> set {_SubjID = value;} >>> } >>> #endregion >>> >>> #region Public Extend Properties >>> public virtual Subj Subj >>> { >>> get { return _Subj; } >>> set { _Subj = value; } >>> } >>> #endregion >>> } >>> >>> >>>No virus found in this incoming message. >>>Checked by AVG Free Edition. >>>Version: 7.5.503 / Virus Database: 269.15.8/1089 - Release Date: 23/10/2007 >>>19.39 >> >> >> >> >>No virus found in this incoming message. >>Checked by AVG Free Edition. >>Version: 7.5.503 / Virus Database: 269.15.8/1089 - Release Date: 23/10/2007 >>19.39 > > > > >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.503 / Virus Database: 269.15.8/1089 - Release Date: 23/10/2007 >19.39
