Oracle ORDS – Quickstart für Entwickler - Opal-Consulting

OracleORDS–Quickstart
fürEntwickler
DietmarAust
Opal-Consul=ng,Köln
www.opal-consul=ng.de
DietmarAust
► Dipl.-Inform.DietmarAust,FreelanceConsultant
▪  Master'sDegreeinComputerScience(MSCS)
► BuildingOraclebasedWebApplica=onssince1997
▪  Portal,Forms,Reports,OWAToolkit,nowAPEX!
► 1997-2000:ConsultantatOracleGermany
► Since09/2000:FreelanceConsultant,Since2006–APEX
only!
► Blog:h\p://daust.blogspot.com/
► RegularpresenteratOracleconferences(ODTUG,DOAG,
OOW)
► AuthoroftheJasperReportsIntegra=ontoolkit
▪  h\p://www.opal-consul=ng.de/tools
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DietmarAust
► 2015DatabaseDeveloperoftheyearintheORDScategory
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Agenda
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Agenda
► WhatisREST?
► WhatisORDS?
▪  ComponentsandArchitecture
► ManagementoftheRESTdefini=onswithSQLDeveloperandtheAPI
► UseCases
▪  Naviga=on/Links/Filter/Sor=ng/Parameter(Input/Output)
► Security
▪  Authen=ca=onandAuthoriza=on
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WhatisREST?
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WhatisREST?
Defini=on
► Itisanarchitecturalstyleforapplica=ons,neitheraprotocolnoraW3C
standard
► REST:=Representa=onalStateTransfertermcoinedin2000byRoyFielding
▪  h\ps://en.wikipedia.org/wiki/Representa=onal_state_transfer
► Characteris=cs:
▪ 
▪ 
▪ 
▪ 
Stateless(100%oftheapplica=onstateismanagedbytheclient)
Basedontheh\pprotocol
Highlyscaleable
RESTusesh\pmethods(POST,PUT,GET,DELETE,…)toimplementCRUD
opera=ons(Create/Read/Update/Delete)
► Why?
▪  Lightweightalterna=vetoRPC(RemoteProcedureCalls)andotherWebServices
(SOAP,WSDL,…)
▪  IncreasinglypopularthroughAPIsprovidedbyGoogle,Facebook,Twi\erand
others.
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WhatisREST?
Ressources
► Ressourcesprovideservicesandareuniquely
iden=fyable
▪  h\p://api.example.com/customers/
▪  h\p://api.example.com/customers/1234
▪  h\p://api.example.com/customers/1234/orders/
► Mul=pleURIscanpointtothesameressource:
▪  h\p://example.org/NewOrleans/traffic/I10
▪  h\p://example.org/traffic/NewOrleans/I10
► Wemodeltheressource,nottheac=on!
▪ 
▪ 
▪ 
▪ 
▪ 
Useofnounsinpluralform
PUTh\p://example.com/accounts/12345
PUTh\p://example.com/accounts/edit/12345
POSTh\p://example.com/accounts/
POSTh\p://example.com/accounts/addaccount
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WhatisREST?
Methods
► Methodsimplementaspecificopera=on
▪  Uniformopera=onsforallressources
▪  GET,POST,PUT,DELETE,OPTIONS,HEAD
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WhatisREST?
Methods
► Communica=onofsuccessanderror
messagesthroughstandardHTTPResponse
codes1xx,2xx,3xx,4xx,5xx
▪  h\p://www.restapitutorial.com/
h\pstatuscodes.html#
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WhatisREST?
Representa=ons
► Representa=onsdeterminehowtheanswerwill
beinterpreted
▪  XMLrepresenta=onusingmime-type:text/xml
▪  JSONrepresenta=onusingmime-type:
applica=on/json
► Asingleressourcecanprovidemul=pledifferent
representa=ons
▪  JSON,XML,CSV…
▪  Therightrepresenta=onisac=vely„nego=ated“
▪  Theclientsendsalistofpreferredmime-types–
theserverrespondswiththebestanswerand
sendsthechosenmime-typeinthe„ContentType“h\pheader.
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WhatisORDS?
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WhatisORDS?
► OracleRestDataServices(ORDS)
▪  MiddlewareJ2EEcomponentinthe
applica=onserver(WLS,Glassfish,Tomcat)
▪  TranslatesURLsintoacallinthedatabase
(eitherselectorstoredprocedurecall)
► Threemajorusecases
▪  SupportforOWAtoolkitapplica=ons(will
replacemod_plsql)
▪  OracleApplica=onExpress(APEX)
▪  RESTfulWebservices
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WhatisORDS?
TheHistory
Version
Date
Description
1.0
2010
First release as Oracle APEX Listener with with support for OWA toolkit used by
APEX
1.1
2011
First release with REST support for JSON, Microdata, CSV, Pagination. Also
added FOP
2.0
2012
OAuth2 support, Integrated with APEX, Multi Database, SQL Developer
integration
2.0.5
2013
Added support for Oracle Pluggable Databases (12c)
2.0.6
2014
Renamed to Oracle REST Data Services to emphasize REST commitment,
integration with APEX 4.2 in SQL Workshop
2.0.8
2014
Added REST Filtering
3.0.0
2015
REST AutoTable, NoSQL, DB12 JSON, Bulk loading over REST,…
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WhatisORDS?
APEXRESTvs.ORDS_METADATARESTSupport
ORDSiscurrentlytransi2oningawayfromthedependencyonAPEX
► ORDSrequiresarepositorytostorethewebservicedefini=ons
► ORDS2.0
► ORDS3.0
► Schemas
► Schemas
▪  APEX_040200/APEX_050000
▪  APEX_LISTENER
▪  APEX_REST_PUBLIC_USER
► Configurationusing
▪  APEXSQLWorkshop
Oracle ORDS – Quickstart für Entwickler
▪  ORDS_METADATA
▪  ORDS_PUBLIC_USER
► Configurationusing
▪  SQLDeveloper
▪  PL/SQLAPI
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WhatisORDS?
APEXRESTvs.ORDS_METADATARESTSupport
► APEXRESTsupportintheAPEXSQLWorkshop
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WhatisORDS?
APEXRESTvs.ORDS_METADATARESTSupport
► Twodifferentrepositories:APEXRESTandORDS_METADATAREST
▪  TypicallybothareinstalledwhenusingAPEX5
▪  APEX5requiresthatyourunapex_rest_config.sqlwhichcreatesAPEX_LISTENER
andAPEX_REST_PUBLIC_USER
► TheFuture?
▪  NewfeatureswillonlybeaddedtoORDS_METADATAREST
► InwhichrepositorydoIcreatethewebservice?
► APEXREST
▪  Integra=onwithAPEXSession
► ORDS_METADATAREST
▪  ThenewRESTfunc=onalitybasedonthenewmetadatarepository
▪  PL/SQLAPIs(defineandoauth)
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WhatisORDS?
Architecture
► HowisaRESTwebservicecallactuallyprocessed?
2. ORDS maps to “EMPLOYEES” SQL
http://myhost/ords/employees/7536
SELECT*FROMEMP
WHEREEMPNO=:b1
1. Browser RESTful get request
5. JSON
Browser
Oracle
REST
Data
Services
ORDS Runs in WLS, Tomcat,
Glassfish container
Oracle ORDS – Quickstart für Entwickler
3. SQ
L Ca
ll ove
4. DB returns JD
r JDB
C
BC Results
Oracle DB
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WhatisORDS?
Architecture
► MapandBind:
▪  ImplicitlyaccessallURIparametersintheURLorinthebody(e.g.POSTrequest)
−  Happensautoma=cally,evenJSONParameters(usingContent-Type:
applica=on/json)
−  AllparametersareSTRINGs
▪  Explicitparameterspossible
−  Properdatatypes
−  Accessheadervariables
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WhatisORDS?
Architecture
► TransformtoJSON
▪  ReturnJSONbyusingbindvariables(declara=vely)orcreatetheJSONmanually
yourself
▪  Declara=veFormats:JSONorCSV,manuallyyoucancreateanything
▪  Canchangetheh\preturncodeorseth\pheadervariables
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WhatisORDS?
Architecture
► Connec=onPooling
▪  ThetargetOracleuser(schema)isac=vatedusingaProxyConnect
▪  TheuserORDS_PUBLIC_USERconnecttothedatabaseandthenswitchesitsiden=tyto
thetargetOracleuser
▪  Thusweneedfewerconnec=onpoolsandeachconnec=onpoolbecomessmallersince
mul=pleOracleuserscanbeservedwiththesameconnec=onpool
▪  EachSQLandPL/SQLstatementisexecutedusingthetheoriginalusersession
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ManagementoftheREST
defini=onswithSQL
DeveloperandtheAPI
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RESTDefini=ons
ManagementwithSQLDeveloper
► ManagementoftheRESTdefini=onswithSQLDeveloper
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RESTDefini=ons
ManagementwithSQLDeveloper
► ManagementoftheRESTdefini=onswithSQLDeveloper
=>connecttoORDSrepositorythroughJ2EEapp
jdbc
http/https
SQL Developer
Oracle
REST
Data
Services
authenticate and
authorize user
APEX_050000
jdbc
Local filestore, Admin user
needs role „SQLDeveloper“
ORDS_METADATA
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RESTDefini=ons
ManagementwithSQLDeveloper
► ManagementoftheRESTdefini=onswithSQLDeveloper
Schema/Workspace will decide between
APEX REST and ORDS REST
► Createuseroncommandline
##UsertomanageRESTdefinitionsinSQLDeveloper
java-jarords.waruserdietmar.aust"SQLDeveloper”
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RESTDefini=ons
ManagementthroughtheAPI
► ManagementthroughthePL/SQLAPI
► Simplefile…containsallresource
templatesandmethodsforamodule
inasingleplace
► Firstwedeletetheexis=ngdefini=on
andthenwerecreateitfromscratch
► Verywellsuitedforscriptbased
deployment
► APIreference(PackageORDS):
h\p://docs.oracle.com/cd/
E56351_01/doc.30/e56293/
ords_ref.htm#AELIG90180
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RESTDefini=ons
Handler-Types
► Handler–types
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
SQLQuery(legacy)(source_type_query)
SQLQuery(eineZeile)(legacy)(source_type_query_one_row)
Feed(source_type_feed)
Collec=on(source_type_collec=on_feed)
Collec=onItem(source_type_collec=on_item)
PL/SQL(source_type_plsql)
−  Generateeverythingmanuallymyself
▪  Media(source_type_media)
−  Binaryrepresenta=ons
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RESTDefini=ons
Handler-Typen
► Handler–Typ:SQLQuery
(legacy)(source_type_query)
▪  Containsalinktoitself
selectemp.*
fromemp
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RESTDefini=ons
Handler-Typen
► Handler–TypSQL:SQLQuery(onerow)
(legacy)(source_type_query_one_row)
selectemp.*
fromemp
whereempno=:empno
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RESTDefini=ons
Handler-Typen
► Handler–TypSQL:Feed
(source_type_feed)
selectemp.*
fromemp
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RESTDefini=ons
Handler-Typen
► Handler–TypSQL:Collec=on
(source_type_collec=on_feed)
selectemp.*
fromemp
► Completeincl.naviga=onlinks:
▪ 
▪ 
▪ 
▪ 
▪ 
Self
Describedby
First(onlybypagina=onorlimit)
Next(onlybypagina=onorlimit)
Previous(onlybypagina=onorlimit)
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RESTDefini=ons
Handler-Typen
► Handler–TypSQL:Collec=onItem
(source_type_collec=on_item)
▪  Containsalinktothecollec=onitself
selectemp.*
fromemp
whereempno=:empno
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UseCases
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UseCases
EnableRESTinSchema
Firststep:EnableRESTcapabili=esforaschemainthedatabase
► UsingtheGUI(right-clickontheconnec=on)
► Usingthecommandline/API
BEGIN
ORDS.ENABLE_SCHEMA(p_enabled=>TRUE,
p_schema=>'ORDSTEST',
p_url_mapping_type=>'BASE_PATH',
p_url_mapping_pattern=>'ordstest',
p_auto_rest_auth=>FALSE);
COMMIT;
END;
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UseCases
Naviga=onandLinks
Implementnaviga=onlinkstonavigatebetweenthedifferentressources
► Linksusedfor:
▪  Linktothecurrentrow
▪  Linktoanimageoranembeddedlist(ressourceorderscancontainalisttothe
relatedorderitems)
▪  Linktotheparent
▪  Linktoother“siblings”usingrela=vepaths,e.g.../..
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UseCases
ModifyressourcesusingPOST,PUTandDELETE
ModifyressourcesusingPOST,PUTandDELETE
► Createanewressource(POST)
► Updatearessource(PUT)
► Deletearessource(DELETE)
Demo
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UseCases
PL/SQLHandler–implementeverythingyourself
► RendereverythingmanuallywithPL/SQLyourself
▪  GETwithTypPL/SQL
▪  UseOWAToolkittowriteitout
−  APEX_JSON,PL/JSON
−  12cJSONFunk=onen
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UseCases
Media-Ressourcen
► Displayanimage
▪  GEThandler(typeMediaressource)
selectmimetype,product_image
fromdemo_product_info
whereproduct_id=to_number(:product_id)
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UseCases
Pagina=on
► Pagina=on
Allowstopaginatethroughtheresultset
Onlyapplicableforhandlertypecollec=on(source_type_collec=on_feed)
h\p://docs.oracle.com/cd/E56351_01/doc.30/e56293/develop.htm#BABIHBDH
Pa\ern:GEThttp://<HOST>:<PORT>/ords/<SchemaAlias>/
<ObjectAlias>/?offset=<Offset>&limit=<Limit>
▪  Alsocreatesthelinks“NEXT”,“PREVIOUS”und“FIRST”mit
▪ 
▪ 
▪ 
▪ 
► Example:
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UseCases
FilterandSort
► ResultSetFiltering
▪  QuerySyntaxtofilteracollec=on
▪  Onlyapplicableforhandlertypecollec=on(source_type_collec=on_feed)
▪  h\p://docs.oracle.com/cd/E56351_01/doc.30/e56293/develop.htm#AELIG90104
► Sor=ng/OrderBy
▪  QuerySyntaxtosortacollec=on
▪  Onlyapplicableforhandlertypecollec=on(source_type_collec=on_feed)
▪  h\p://docs.oracle.com/cd/E56351_01/doc.30/e56293/develop.htm#AELIG90104
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UseCases
Parameter
► Inputparameters
▪  Implicit
−  AllvariablesthatarepassedintheURLorinthecontentbody
−  :content_type(varchar2,z.B.applica=on/json)
−  :body(alsBLOB)
▪  Explicit(usingdeclara=veparameters)
−  Allregularh\pheadervariables
−  AllvariablesthatarepassedintheURLorinthecontentbody
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UseCases
Parameter
► Outputparameters
▪  ONLYExplicit(usingdeclara=veparameters)
−  Returnaresponsebysezngasimplebindvariablewhichisthen
convertedautoma=callytoJSONbyORDS(:empno:=99)
−  Setanh\pResponseCode(Pseudo-Header:X-APEX-STATUS-CODE),
e.g.:status:=201,403
−  RedirecttoadifferentURL(Pseudo-Header:X-APEX-FORWARD)
−  Setah\pheadervariable
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Demo
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Security
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Security
► Differentwaysofauthen=ca=ngthecurrentuser
▪  Authen=ca=onusingtheintegratedpasswordstore(“creden=als”file–just
recommendedfordevelopmentandtestenvironments)
▪  Authen=ca=onusingtheapplica=onserver(authen=ca=onisdelegated,e.g.to
Glassfish)
► Authen=ca=onusingOAUTH2
▪  Establishedstandard–usedwidely
▪  Basicallycontrolsa“session”betweenclient/serverandyous=llneedto
authen=catewiththeappserver
► MoredetailstousingOAUTH2withORDS:Ar=clesfromCarstenCzarski(in
German,butcanbetranslatedusingGoogleTranslator)
▪  h\p://json-rest-oracledb.blogspot.de/2015/12/vorher-anmelden-bi\eauthen=fizierung.html
▪  h\p://json-rest-oracledb.blogspot.de/2016/01/ords-und-3-legged-oauth-sogehts.html
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Security
► Authoriza=on:=Protectaccesstoressourcesforcertainuserroles
► CreateaROLEfirst(onlypossiblethroughtheAPI)
► CreateaprivilegetoprotectafullmoduleorjustaURIpa\ern
► Cannotrequireprotec=onjustforaspecificmethod,e.g.limitaccesstoPUT,
POST,DELETEandallowGETforeverybody.
▪  Perhapsusingtwomodules:
−  /public/departments/(implementGEThandler)
−  /protected/departments/(implementGET,POST,PUT,DELETE
handler)
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Security
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Demo
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Debugging/
Troubleshoo=ng
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Debugging/Troubleshoo=ng
► Displayerrormessagesdirectlyinthebrowser(onlyuseondevelopment/
testenvironments,notproduc=on!)
▪  Modifydefault.xml
<entrykey="debug.debugger">true</entry>
<entrykey="debug.printDebugToScreen">true</entry>
► Fullloggingwithalldetailsusingjava.u=l.logging
▪  h\ps://cdivilly.wordpress.com/2013/03/08/configuring-logging-in-oracleapplica=on-express-listener-2-0-1/
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Tools
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Tools
► Commandlinetool:curl-h\ps://curl.haxx.se/
► AdvancedRESTClient(forGoogleChrome)
▪  h\ps://chrome.google.com/webstore/detail/advanced-rest-client/
hgmloofddffdnphfgcellkd{{jeloo
► PLSQLlogger
▪  h\ps://github.com/OraOpenSource/Logger
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FurtherReading
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FurtherReading
► Slidestodownload:h\p://daust.blogspot.de
► Wikipedia:h\p://en.wikipedia.org/wiki/Representa=onal_State_Transfer
► REST–APIDesign
▪  h\p://www.vinaysahni.com/best-prac=ces-for-a-pragma=c-res|ul-api
▪  h\ps://www.thoughtworks.com/de/insights/blog/rest-api-design-resourcemodeling
▪  h\p://blog.octo.com/en/design-a-rest-api/
▪  h\ps://res|ul-api-design.readthedocs.org/en/latest/intro.html
▪  h\p://blog.mwaysolu=ons.com/2014/06/05/10-best-prac=ces-for-be\er-res|ulapi/
► CarstenCzarskiBlogaboutREST:h\p://json-rest-oracledb.blogspot.de/(can
betranslatedusinggoogletranslator)
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WeitereInforma=onsquellen
► RESTfulWebServices,byLeonardRichardsonandSamRuby,availablefrom
O’ReillyMediaath\p://oreilly.com/catalog/9780596529260/
► Thesource:h\p://www.ics.uci.edu/~fielding/pubs/disserta=on/top.htm
mostlychapters5and6
► Anice14minutevideointroduc=on:
h\p://www.youtube.com/watch?v=YCcAE2SCQ6k
► HTTPspec:h\p://tools.ie|.org/html/rfc2616
► URIspec:h\p://tools.ie|.org/html/rfc3986
► JSONformat:h\p://json.org/
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1-DayDeveloperWorkshop
1TagesEntwicklerWorkshopORDS
► InKölnam11.Juli
► Themen
▪ 
▪ 
▪ 
▪ 
▪ 
Installa=on/Konfigura=onfürAPEX/mod_plsqlundREST
„RealWorld“Projekt(kompliziertesBeispiel)
VerschiedeneUseCasesmitvielenHands-Ons
Authen=fizierungmitWLS,GlassfishundTomcat
OAUTH2Implemen=erung
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Contact
DietmarAust
Opal-Consul=ng,Köln
www.opal-consul=ng.de
daust.blogspot.com
dietmar.aust@opal-consul=ng.de
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Auto-REST
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Auto-REST
QuicklyAuto-RESTenableadatabasetableorview
► Pros:
▪  Fastandeasy
▪  CandosomecleverthingsusingINSTEAD_OFtriggersontheview
► Cons:
▪  Can’tusetheauthen=cated:current_uservariabletofigureouttheuseriden=ty
whichisrequiredforloggingpurposes
▪  Currentlyafeatureisunderdiscussiontomake:current_useravailablethrough
sys_contextsimilartoapex.
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UseCases
EnableRESTinSchema
EnableRESTcapabili=esforatableorview
► UsingtheGUI(right-clickonthetable/view)
▪  „EnableRESTService“
► Usingthecommandline/API
BEGIN
ORDS.ENABLE_OBJECT(p_enabled=>TRUE,
p_schema=>'ORDSTEST',
p_object=>'DEPT',
p_object_type=>'TABLE',
p_object_alias=>'dept',
p_auto_rest_auth=>FALSE);
COMMIT;
END;
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Demo
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