Object-Oriented Databases & Db4o
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Semantic Queries by Example
Semantic Queries by Example Lipyeow Lim Haixun Wang Min Wang University of Hawai‘i at Manoa¯ Microsoft Research Asia Google, Inc. [email protected] [email protected] [email protected] ABSTRACT 1. INTRODUCTION With the ever increasing quantities of electronic data, there A growing number of advanced applications such as prod- is a growing need to make sense out of the data. Many ad- uct information management (PIM) systems, customer re- vanced database applications are beginning to support this lationship management (CRM) systems, electronic medical need by integrating domain knowledge encoded as ontolo- records (EMRs) systems are recognizing the need to incor- gies into queries over relational data. However, it is ex- porate ontology into the realm of object relational databases tremely difficult to express queries against graph structured (ORDBMs) so that the user can query data and its related ontology in the relational SQL query language or its exten- ontology in a consistent manner [7, 14, 22]. However, it is sions. Moreover, semantic queries are usually not precise, extremely tedious and time consuming to understand ontol- especially when data and its related ontology are compli- ogy, and use ontology in database queries [15]. Such queries cated. Users often only have a vague notion of their infor- that leverage the semantic information stored in ontologies mation needs and are not able to specify queries precisely. to filter and retrieve data from relational tables are called In this paper, we address these challenges by introducing semantic queries. The success of the relational database a novel method to support semantic queries in relational technology is at least partly due to the spartan simplicity databases with ease. -
The Comparison of SQL, QBE, and DFQL As Query Languages for Relational Databases
Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection 1994-03 The comparison of SQL, QBE, and DFQL as query languages for relational databases Girsang, Paruntungan Monterey, California. Naval Postgraduate School http://hdl.handle.net/10945/30910 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS THE COMPARISON OF SQL, QBE, AND DFQL AS QUERY LANGUAGES FOR RELATIONAL DATABASES by Paruntungan Oirsang March 1994 Thesis Advisor: c. Thomas Wu Approved for pubhc release; distnbunon IS unlimited. The sis G4 5 42 "1,; ')I.EY KN OX Llr ... .• -:- ' J :;. ',,\1. POSTG' 'IOO! MONTEREY CI ." REPORT DOCUMENTATION PAGE f'W1 .. _ng ......... ,... _ .. .-._.. _' ... '.... _,............ __ . 'l1li __ ~"' ......... _'"" __ .... """"'"""' .... _ ... _ .. ___~ ..""' __.... II'/ __.. 1hiI <OI_ .............. --. __.......... "'.bu_"'-..... fIMoIo_-.O'_"" ____, 1211_ O""H~,S.i.,-. ......... VA~,01111 ..... ~ .. "'"'-.......... P_____ "......(o_8II,_....,tx:_ :~:::U::-_·_I a.~ORTDA~Q4 Master' The Comparison of ~QL. DFQL, and DFQL as Query Languages for Relational Databases L~.'_"") Girsang, Parunmngan LJIE MINO 7·N=Po~;:d':':'S'~~~~S)ANDADDRiSS(ESl AEPOIITNUMBEA Monterey, CA 93943-5000 ANDADDRESS(U) lo.SPONSORINGIMONITCAIMQ AQENCYIISPORTNI.IIIIBIiR t1.SUPPlEMENTARYNDTU The views expressed in this thesis are those of the author and do not reflect the official policy or position of the Department of Defense or the United States GovemmenL 13.AIBTRACT(Mui'l'llm2Oll_J Structw'e Query Language (SQL) and Query By Example (QBE) are the most widely used query languages for Relational Database Management Systems (RDBMS·s). However, both of them have problems concerning ease-of-use issues. especially in expressing universal quantification, specifying complex nested queries. and flexibility and consistency in specifying queries with respect to data retrieval. -
Ch06-The Relational Algebra and Calculus.Pdf
Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 6- 1 Chapter 6 The Relational Algebra and Calculus Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Chapter Outline Relational Algebra Unary Relational Operations Relational Algebra Operations From Set Theory Binary Relational Operations Additional Relational Operations Examples of Queries in Relational Algebra Relational Calculus Tuple Relational Calculus Domain Relational Calculus Example Database Application (COMPANY) Overview of the QBE language (appendix D) Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 6- 3 Relational Algebra Overview Relational algebra is the basic set of operations for the relational model These operations enable a user to specify basic retrieval requests (or queries) The result of an operation is a new relation, which may have been formed from one or more input relations This property makes the algebra “closed” (all objects in relational algebra are relations) Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 6- 4 Relational Algebra Overview (continued) The algebra operations thus produce new relations These can be further manipulated using operations of the same algebra A sequence of relational algebra operations forms a relational algebra expression The result of a relational algebra expression is also a relation that represents the result of a database query (or retrieval request) Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 6- 5 Brief History of Origins of Algebra Muhammad ibn Musa al-Khwarizmi (800-847 CE) wrote a book titled al-jabr about arithmetic of variables Book was translated into Latin. Its title (al-jabr) gave Algebra its name. Al-Khwarizmi called variables “shay” “Shay” is Arabic for “thing”. -
Db4o Tutorial
Welcome db4o is the native Java, .NET and Mono open source object database. This tutorial was written to get you started with db4o as quickly as possible. Before you start, please make sure that you have downloaded the latest db4o distribution from the db4objects website. developer.db4o.com You are invited to join the db4o community in the public db4o forums to ask for help at any time. Please also try out the keyword search functionality on the db4o knowledgebase. Links Here are some further links on developer.db4o.com that you may find useful: All Downloads Release Note Blog SVN Access Design Wiki Community Projects Download Contents The db4o Java distribution comes as one zip file, db4o-7.0-java.zip. When you unzip this file, you get the following directory structure: Please take a look at all the supplied documentation formats to choose the one that works best for you: . db4o-7.0/doc/api/index.html The API documentation for db4o is supplied as JavaDocs HTML files. While you read through this tutorial it may be helpful to look into the API documentation occasionally. www.db4o.com db4o-7.0/doc/reference/index.html The reference documentation is a complete compilation for experienced db4o users. It is maintained online. db4o-7.0/doc/tutorial/index.html This is the interactive HTML tutorial. Examples can be run "live" against a db4o database from within the browser. In order to use the interactive functionality a Java JRE 1.3 or above needs to be installed and integrated into the browser. -
Java LDAP Persistence with Datanucleus
Java LDAP Persistence with DataNucleus Stefan Seelmann [email protected] Java LDAP Persistence with DataNucleus • Stefan Seelmann • Freelancer – Software Development with Java – LDAP, Identity- and Access-Management • Open Source Developer – Apache Directory Project – DataNucleus LDAP Store Java LDAP Persistence with DataNucleus Agenda • Motivation • Java Persistence, JDO and DataNucleus • Basic Demo • DataNucleus LDAP Store • Advanced Demo • Status and Conclusion Java LDAP Persistence with DataNucleus Java LDAP Development • Java APIs for LDAP – Mature: Netscape LDAP SDK, JLDAP (Novell/OL) – Modern: Unbound ID, Apache Directory, OpenDS • Hopefully a common Java LDAP API soon? – JNDI, Spring-LDAP • Drawback: – Developer has to deal with LDAP • DN, RDN, filters, modification items, error codes – Boiler-Plate code, exception handling Java LDAP Persistence with DataNucleus Java Persistence • Standards – JPA (Java Persistence API): JSR 220, RDBMS only – SDO (Service Data Objects): JSR 235 – JDO: (Java Data Object): JSR-12 and JSR-243 • Products – O/R Mapper: Hibernate, TopLink/EclipseLink, ... – Apache iBATIS, Cayenne, OpenJPA, Tuscany, ... – DataNucleus – ... Java LDAP Persistence with DataNucleus JDO • Java-centric API to access persistent data • Datastore independent • Started by Sun, now driven by Apache JDO • Versions 1.0, 2.0, 2.1, 2.2, 2.3 in progress • Three main parts – Persistence definition (metadata) – Persistence API – Query language/API Java LDAP Persistence with DataNucleus DataNucleus • Reference implementation of JDO • Apache -
Db4objects Creator of Db4o – the Open Source Object Database
db4objects Creator of db4o – the Open Source Object Database Presentation for EclipseME Team Carl Rosenberger, CSA db4objects Christof Wittig, CEO db4objects May 16, 2007 1 Introduction | Key Facts | db4objects, Inc. ⏐ db4o is the world’s most popular object database ⏐ Focus on embedded, zero-admin use ⏐ Open source / dual license business model “I stumbled into db4o's highly addictive ease of use and power ⏐ 20,000 registered developers (Java and .NET) [...] The savings are substantial even when you factor-in the cost ⏐ 100 commercial customers (Boeing, Ricoh, Seagate) associated with acquiring a commercial license 2 User Aziz Introduction | db4o | The Product ⏐ db4o is an embeddable, zero-admin database ⏐ Native to Java and .NET applications ⏐ Enables developers to store their application objects with only one line of code ⏐ Replaces traditional dual schema or O/R mapping approaches ⏐ Requires no DBA ⏐ Saves significant time and corresponding cost; enables new types of distributed applications and makes “I demonstrated that the application would reduce the logic software easier to maintain, refactor, and reuse code, which is 60% for persistence, to one hundredth of ⏐ db4o has a unique architecture which takes full that, and improve performance ten advantage of Java and .NET’s object-oriented fold, not to mention the overall simplification.” programming paradigms 3 Michael Couck Content ⏐ Company ⏐ Product ⏐ Market ⏐ Vision “Tools are available […], but is it perfect? Far from it. One thing that I really appreciate when using Db4o is that I have no such problems. Simply because there is no database schema or in other words: the database schema reflects what I have in my model.” 4 Michal Talaga db4objects, Inc. -
T.2835.Pdf (4.405Mb)
UNIVERSIDAD MAYOR DE SAN ANDRES FACULTAD DE CIENCIAS PURAS Y NATURALES CARRERA DE INFORMÁTICA TESIS DE GRADO TRANSFORMACIÓN DE BASES DE DATOS RELACIONALES HACIA BASE DE DATOS ORIENTADAS A OBJETOS PARA OPTAR AL TÍTULO DE LICENCIATURA EN INFORMÁTICA MENCIÓN: INGENIERÍA DE SISTEMAS INFORMÁTICOS POSTULANTE: GONZALO OSCO HERNANDEZ TUTOR METODOLOGICO: M.Sc. JORGE TERAN POMIER ASESOR: Lic. CELIA TARQUINO PERALTA LA PAZ – BOLIVIA 2014 UNIVERSIDAD MAYOR DE SAN ANDRÉS FACULTAD DE CIENCIAS PURAS Y NATURALES CARRERA DE INFORMÁTICA LA CARRERA DE INFORMÁTICA DE LA FACULTAD DE CIENCIAS PURAS Y NATURALES PERTENECIENTE A LA UNIVERSIDAD MAYOR DE SAN ANDRÉS AUTORIZA EL USO DE LA INFORMACIÓN CONTENIDA EN ESTE DOCUMENTO SI LOS PROPÓSITOS SON ESTRICTAMENTE ACADÉMICOS. LICENCIA DE USO El usuario está autorizado a: a) visualizar el documento mediante el uso de un ordenador o dispositivo móvil. b) copiar, almacenar o imprimir si ha de ser de uso exclusivamente personal y privado. c) copiar textualmente parte(s) de su contenido mencionando la fuente y/o haciendo la referencia correspondiente respetando normas de redacción e investigación. El usuario no puede publicar, distribuir o realizar emisión o exhibición alguna de este material, sin la autorización correspondiente. TODOS LOS DERECHOS RESERVADOS. EL USO NO AUTORIZADO DE LOS CONTENIDOS PUBLICADOS EN ESTE SITIO DERIVARA EN EL INICIO DE ACCIONES LEGALES CONTEMPLADOS EN LA LEY DE DERECHOS DE AUTOR. DEDICATORIA A Dios, por haber hecho posible que haya llegado a este punto tan importante de mi vida, además por darme una familia y amigos maravillosos. A mi familia, que sin duda son mi fuente de inspiración para cada actividad, apoyándome en cada objetivo que me proponga en cada momento y aconsejándome para que cada día me vaya superando tanto como persona como en mi vida profesional. -
Db4o Tutorial
Welcome db4o is the native Java, .NET and Mono open source object database. This tutorial was written to get you started with db4o as quickly as possible. Before you start, please make sure that you have downloaded the latest db4o distribution from the db4objects website. developer.db4o.com You are invited to join the db4o community in the public db4o forums to ask for help at any time. Please also try out the keyword search functionality on the db4o knowledgebase. Links Here are some further links on developer.db4o.com that you may find useful: All Downloads Release Note Blog SVN Access Design Wiki Community Projects Download Contents The db4o Java distribution comes as one zip file, db4o-6.4-java.zip. When you unzip this file, you get the following directory structure: Please take a look at all the supplied documentation formats to choose the one that works best for you: . db4o-6.4/doc/api/index.html The API documentation for db4o is supplied as JavaDocs HTML files. While you read through this tutorial it may be helpful to look into the API documentation occasionally. www.db4o.com db4o-6.4/doc/reference/index.html The reference documentation is a complete compilation for experienced db4o users. It is maintained online. db4o-6.4/doc/tutorial/index.html This is the interactive HTML tutorial. Examples can be run "live" against a db4o database from within the browser. In order to use the interactive functionality a Java JRE 1.3 or above needs to be installed and integrated into the browser. -
Versant Bro Final.Indd
Innovation that Inspires from the Leader in Object Database Technology THE DATABASE FOR DEVELOPERS • TelecommunicaTions • Defense • f i nancial s e rvice s • li f e sci e nce s • • Tran s p orTaTion • man u facTu r i ng • on li n e gam i ng • versanT Delivering 20 Years of Performance-orienteD software innovation Versant Corporation is the industry leader Improves Versant Developer/Customer Improves Improves Operational in object database management software. Feature Benefit Agility Scalability Efficiencies Versant object database technology enables No ORM mapping, for optimal Reduces application code by software developers to create unique, transparency up to 40% ✔ extreme performance applications to manage Easy object graph navigation Achieves 10X improvement in and fast caching APIs system performance without complex information in environments that complex programming ✔ ✔ ✔ demand the highest performance and high Seamless schema evolution Shortens feature development availability. These applications do far more for shorter development sprints life cycle and improves code ✔ refactoring ability than run day-to-day business operations; they Enables test-driven development Increases code quality and define businesses and deliver competitive C++, JAVA, .NET via API-driven database setup improves time to market ✔ advantage. Versant object database solutions and teardown are deployed in more than 100,000 sites CLIENT Higher concurrent throughput Reduces cloud server costs by CACHE with fewer CPUs up to 50% ✔ ✔ across a wide range of industries, including No data duplication or Reduces storage requirements telecommunications, defense, financial redundant indexes by up to 50% ✔ ✔ MONITORING OBJECT INSPECTOR services, life sciences, transportation, oDBMS Leverages parallel processing— Increases mission-critical system manufacturing, and online gaming. -
Espresso: Brewing Java for More Non-Volatility with Non-Volatile Memory
Espresso: Brewing Java For More Non-Volatility with Non-volatile Memory Mingyu Wu, Ziming Zhao, Haoyu Li, Heting Li, Haibo Chen, Binyu Zang, Haibing Guan Shanghai Key Laboratory of Scalable Computing and Systems Institute of Parallel and Distributed Systems, Shanghai Jiao Tong University Abstract straction brought by the language virtual machine (e.g., JVM) Fast, byte-addressable non-volatile memory (NVM) em- complicates the persistence management. braces both near-DRAM latency and disk-like persistence, The mainstream persistent programming model leverages a which has generated considerable interests to revolutionize coarse-grained abstraction like Java Persistence API (JPA)[9] system software stack and programming models. However, it to provide easy-to-use transactional APIs for programmers to is less understood how NVM can be combined with managed persist their data. However, it does not consider the emer- runtime like Java virtual machine (JVM) to ease persistence gence of NVM, and creates unnecessary transformation over- management. This paper proposes Espresso1, a holistic ex- head between Java objects and native serialized data. In tension to Java and its runtime, to enable Java programmers contrast, the recent proposed Persistent Collections for Java to exploit NVM for persistence management with high perfor- (PCJ) [14] provides a fine-grained programming model to en- mance. Espresso first provides a general persistent heap de- able users to manipulate persistent data in object level. How- sign called Persistent Java Heap (PJH) to manage persistent ever, it has built an independent type system against the orig- data as normal Java objects. The heap is then strengthened inal one in Java, which makes it hard to be compatible with with a recoverable mechanism to provide crash consistency existing Java programs since it mandates the use of the collec- for heap metadata. -
A Generalized Approach for Visual Query Formulation for Text
Query By Templates: A Generalized Approach for Visual Query Formulation for Text Dominated Databases y Arijit Sengupta Andrew Dillon Computer Science Department Scho ol of Library & Information Science Indiana University Indiana University Blo omington, IN 47405 Blo omington, IN 47405 [email protected] [email protected] structured do cuments not only for the traditional pur- Abstract p oses of reading, browsing, and printing, but also for The WWW has a great potential of evolving into searching and querying. Automated searches in nor- aglobal ly distributed digital document library.The pri- mal word-pro cessor do cuments are usually restricted mary use of such a library is to retrieve information to linear word searches. However, users can use do cu- quickly and easily. Because of the size of these li- ments enco ded in SGML to p ose much more complex braries, simple keyword searches often result in too searches involving b oth text content and structure. many matches. More complex searches involving boolean expressions are dicult to formulate and un- derstand. This paper describes QBT (Query By Tem- 1.1 SGML, Databases and Do cuments plates), a visual method for formulating queries for structured document databases modeled with SGML. Traditionally, do cuments in electronic formats like Based on Zloof 's QBE (Query By Example), this text or word-pro cessor do cuments are used mainly method incorporates the structure of the documents for word pro cessing, editing, publishing, and p ossible for composing powerful queries. The goal of this tech- reuse into other do cuments. The problem with these nique is to design an interface for querying struc- do cuments is that they can not b e easily used for pur- tured documents without prior know ledge of the in- p oses other than what they are primarily designed for. -
Towards Standard-Based (Healthcare) Ecosystems Of
Department of Computer Science Overskrift her Towards Standard-Based (Healthcare) Ecosystems of Systems Navn på oplægsholder Navn på KU- enhed Konstantinos Manikas 1st Scandinavian Workshop on the Engineering of Systems-of-Systems (SWESoS 2015) For at ændre ”Enhedens”Enhedens navn”navn” og ”Sted”Sted og dato”:dato”: (Work presented in collaboration with Klaus Marius Hansen, Henrik Bærbak Christensen, Morten Kyng, Jens Knodel) Klik i menulinjen, vælg ”Indsæt””Indsæt” >> ”Sidehoved”Sidehoved / SidefodSidefod”.”. Indføj ”Sted”Sted og datodato”” i feltet for dato og ”Enhedens”Enhedens Slide 1 navnnavn”” i Sidefod Department of Computer Science Overskrift her Overview Tekst starter uden Investigate intersection of software ecosystems and punktopstilling systems of systems For at få punkt- opstilling på teksten, brug Propose: Standard-based ecosystem of systems forøg indrykning Facilitated by For at få venstre- stillet tekst uden Reference architecture punktopstilling, brug formindsk indrykning Explicit orchestration (governance, certification) Standards only means to value creation For at ændre ”Enhedens”Enhedens navn”navn” og ”Sted”Sted og dato”:dato”: Klik i menulinjen, vælg ”Indsæt””Indsæt” >> ”Sidehoved”Sidehoved / SidefodSidefod”.”. Indføj ”Sted”Sted og datodato”” i feltet for dato og ”Enhedens”Enhedens Slide 2 navnnavn”” i Sidefod Department of Computer Science Overskrift her Background Tekst starter uden punktopstilling PhD thesis on software ecosystems for telemedicine services For at få punkt- opstilling på teksten, brug Problem: forøg indrykning Low incentives for TM development For at få venstre- although potential benefits stillet tekst uden High requirements on interoperability punktopstilling, brug formindsk Data sharing indrykning “Silo” solution For at ændre Telemedicine domain: ” ” ”EnhedensEnhedens navn”navn Mission-critical nature og ”Sted”Sted og dato”:dato”: regulated Klik i menulinjen, vælg ”Indsæt””Indsæt” >> requirements on safety, security, privacy ”Sidehoved”Sidehoved / SidefodSidefod”.”.