Persistent objects

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  • Relational databases are indisputably at the core of the modern enterprise. While modern programming languages, including JavaTM, provide an intuitive, object-oriented view of application-level business entities, the enterprise data underlying these entities is heavily relational in nature. Further, the main strength of the relational model—over earlier navigational models as well as over later OODB models—is that by design it is intrinsically agnostic to the programmatic manipulation and application-level view of the data that it serves up...

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  • Unique to the popular Grails web framework is its architecture. While other frameworks are built from the ground up, Grails leverages existing and proven technologies that already have advanced functionality built in. One of the key technologies in this architecture is Hibernate, on top of which Grails builds its GORM (Grails Object Relational Mapping) model layer. This provides Grails a persistence solution.

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  • In the last tutorial, we have introduced how to use HQL for querying persistent objects. Hibernate is providing an alternative method called “Criteria Queries” for this task.

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  • Microsoft’s ADO.NET Entity Framework, known widely as EF, introduced out-of-thebox Object Relational Mapping to .NET and Visual Studio. Central to Entity Framework was the Entity Data Model, a conceptual model of your application domain that maps back to the schema of your database. This conceptual model describes the core classes in your application. Entity Framework uses this conceptual model while querying from the database, creating objects from that data and then persisting changes back to the database....

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  • In the previous example, we treat each chapter of a book as a string and store it in a collection. Now we extend this example by making each chapter of a persistent object type.

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  • The general concept of caching persistent objects is that when an object is first read from external storage, a copy of it will be stored in the cache.

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  • The international significance of research into the sources, behaviour, fate, and effects of persistent organic pollutants (POPs) is exemplified by the Stockholm Convention for which the host organisation is the United Nations Environment Programme (UNEP). Following extensive negotiation, it was adopted on 22 May 2001, entered into force 90 days after the 50th party had ratified it on 17 May 2004, and by late 2008 there were over 180 participants (http://chm.pops.int/).

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  • Wastes are very process-specific but the key pollutants can be derived from knowledge of: the process, construction materials, corrosion / erosion mechanisms and maintenance materials. Waste audits are used to gather information on the source, composition, quantity and variability of all wastes. Waste prevention typically involves preventing the arising of waste at source, minimising the arisings and recycling any waste that is generated.

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  • Programming technologies have improved continuously during the last decades but, from an Information Systems perspective, some well-known problems associatedwith the design and implementation of an Information Systems persist:Object- Oriented Methods, Formal Specification Languages, Component-Based Software Production,Aspect-OrientedApproaches.This is only a very short list of technologies proposed to solve a very old and, at the same time, very well-known problem: how to produce software of quality.

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  • The predominant and persistent indoor VOCs included aldehydes (e.g., formaldehyde, acetaldehyde, pentanal, hexanal and nonanal) and terpene hydrocarbons (e.g., a-pinene, 3-carene and d-limonene), which are characteristic of wood product emissions. Other compounds of interest included phenol, naphthalene, and other aromatic hydrocarbons. VOC concentrations were generally typical of results reported for other new houses. Measurements of total VOCs were used to evaluate short-term changes in indoor VOC concentrations. ...

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  • The current study was undertaken in a new manufactured house set up as a research facility. The plan was to conduct longitudinal measurements of VOC concentrations in the house along with measurements of key physical parameters including house air change rate, indoor and outdoor temperature and relative humidity, and wind conditions over a period of approximately one year. The primary objective was to evaluate changes in the emissions of formaldehyde and other VOCs in response to time, house air change rate, and the other parameters.

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  • This module provides students with the skills needed to create Extensible Markup Language (XML) documents from the data contained within programmatic objects. This process is referred to as serialization and can be used to persist object data or to share object data between applications.

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  • JDBC has simplified database access in Java applications, but a few nagging wrinkles remain—namely, persisting Java objects to relational databases. With this book, you’ll learn how the Spring Framework makes that job incredibly easy with dependency injection, template classes, and object-relational-mapping (ORM). Through sample code, you’ll discover how Spring streamlines the use of JDBC and ORM tools such as Hibernate, the Java Persistence API (JPA), and Java Data Objects (JDO).

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  • The record, however, shows that in many, if not most, developing coun- tries, the poor have by and large not benefited from government pro- grams and projects in these areas. The reason, of course, has been the weak capacity of government. States with weak institutions have to find other ways to deliver basic social services and economic infrastructure to their poor citizens. One of these ways is to work in partnership with private sector and community organizations, sometimes called civil so- ciety.

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  • Ouedraogo et al. 2006). Most patients presented with symptoms suspicious for TB; thus, lack of diagnostic sensitivity of health workers is of concern (Wandwalo & Morkve 2000). Afghanistan has the highest TB burden in south Asia (World Health Organization 2007). While health services are expanding and quality improving, gaps in access and deficient quality of some interventions persist. The Ministry of Public Health adopted a Basic Package of Health Services (BPHS) in 2003, which provides standard primary care services for districts covering 77% of the population.

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  • “This book introduces a new and important idea, providing a rigorous approach to Patterns-Based Engineering. As the number of published patterns has increased, understanding how to apply them across all parts of the software development lifecycle has become critically important.” —Kyle Brown, Distinguished Engineer, IBM Software Group, Author of Persistence in the Enterprise “To misquote Confucius, ‘Give a man a solution and you solve his problem for a day. Teach a man a pattern and you’ve solved his problems for a lifetime.

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  • In 2007, a UNICEF report on the well-being of children around the world, ranked the UK at the bottom of the world’s 21 richest countries. For all six parameters: material well-being, health and safety, educational well-being, family and peer relationships, behaviour and risks and subjective well-being, the UK was amongst the bottom five countries (UNICEF 2007). Since then, there has been considerable debate in the UK about ways to measure and enhance children’s well-being.

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  • This chaper describe the concept of persistence, define entity beans, list the features offered by entity beans, compare entity and session beans, explain Message-Driven Beans.

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  • In this chapter, you will learn how to programmatically create (and destroy) a directory system as well as move data into and out of various streams (file based, string based, memory based, etc.). The latter part of this chapter examines the role of isolated storage, which allows you to persist per-user data into a safe sandbox, regardless of the security settings of a target machine.

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  • This is the second of two chapters on object-oriented tools and techniques for systems development. This chapter focuses specifically on tools and techniques that are used during systems design. You will know object-oriented systems design when you can: Differentiate between entity, interface, control, persistence, and system classes; understand the concept of a dependency and navigability; define visibility and explain its three levels;...

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