dfc search in depth

《dfc search in depth》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、DFCSearchInDepthThisarticleexploresDocumentumsearchfeatureswithaheavyfocusontheJavaDFCAPIsrelatedtosearch.IntroductionThisarticleexploresDocumentumsearchfeatureswithaheavyfocusontheJavaDFCAPIsrelatedtosearch.Documentumproductmanualsareinvaluableresourcesincoming

2、tounderstandtheseconcepts,butinmanycasestheyaremissingimportantdetails–detailsthatyouwouldotherwisehavetolearnviaprototypingandtrialanderror.InthisarticleI’llattempttocoverthesemissingdetailswhileprovidingafocusedoverviewofDFCsearchandqueryfeatures.TheSimpleQuer

3、yAPIDFC’ssimplequeryAPIallowsyoutoexecutequeriesexpressedasDQLstrings.Here’sanexample:publicIDfCollectiongetLargeDocuments(IDfSessionsession)throwsDfException{IDfQueryquery=newDfClientX().getQuery();query.setDQL("SELECT*FROMdm_document"+"WHEREr_full_content_size

4、>1000000");returnquery.execute(session,IDfQuery.DF_READ_QUERY);}Here,wecreateanIDfQueryinstanceusingthefactorymethodIDfClientX.getQuery().ThenwepopulatethequerywithavalidDQLstringandcallthequery’sexecute()methodwithanIDfSessioninstance.DFCdocumentationreferstoth

5、isas“thesimplequeryAPI.”TherearesomesignificantlimitationstothisAPI:·Onlyqueriesonasinglerepositoryarepermitted.ThetargetofthequeryisimplicitlythedefaultrepositoryoftheprovidedIDfSession.·OnlyDocumentumrepositoriescanbequeried.Youcannotqueryanexternal,federated(

6、ECIS)source.·Thereisnosupportforprogrammaticallybuildingqueries;onlyexplicitDQLquerystringsaresupported.·Executingaqueryisalwaysathread-blockingoperation;thatis,thethreadissuingtheAPIcallblocksuntilthequeryresultsarereturned.ThesearchserviceAPI,includedinDocumen

7、tum5.3SP1andlaterreleases,resolvestheselimitations.ThenextsectioncoversthisextensiveAPIindetail.TheSearchServiceAPIThesearchserviceAPIisrootedattheIDfSearchServiceinterface:Figure1:TheIDfSearchServiceinterface.Toobtainaninstanceofthisclass,useIDfClient.newSearch

8、Service():IDfSearchServicesearchService=newDfClientX().getLocalClient().newSearchService(mgr,repo);ThefirstparameterofthenewSearchService()factorymethodisanIDfSession