Pricemate

Electrification of Heavy-Duty Construction Vehicles - Amir Khajepour - Bog - Springer International Publishing AG - Plusbog.dk

The number of heavy-duty construction vehicles is increasing significantly with growing urban development causing poor air quality and higher emissions.

DKK 468.00

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Reducing Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two - Board On Energy And Environmental Systems - Bog

Medium- and heavy-duty trucks, motor coaches, and transit buses - collectively, "medium- and heavy-duty vehicles", or MHDVs - are used in every sector of the economy. The fuel consumption and greenhouse gas emissions of MHDVs have become a focus of legislative and regulatory action in the past few years. This study is a follow-on to the National Research Council's 2010 report, Technologies and Approaches to Reducing the Fuel Consumption of Medium-and Heavy-Duty Vehicles. That report provided a series of findings and recommendations on the development of regulations for reducing fuel consumption of MHDVs. On September 15, 2011, NHTSA and EPA finalized joint Phase I rules to establish a comprehensive Heavy-Duty National Program to reduce greenhouse gas emissions and fuel consumption for on-road medium- and heavy-duty vehicles. As NHTSA and EPA began working on a second round of standards, the National Academies issued another report, Reducing the Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two: First Report, providing recommendations for the Phase II standards. This third and final report focuses on a possible third phase of regulations to be promulgated by these agencies in the next decade. Table of ContentsFront MatterSummary1 Introduction2 Setting the Stage: Regulatory Horizons, Challenges, and Influences3 Certification, Compliance, and Enforcement4 Powertrain Technologies5 Technologies for Reducing the Power Demand of MHDVs6 Projected Benefits of Technologies on Fuel Consumption7 Hybrid and Electric Powertrain Technologies8 Battery Technology for Medium- and Heavy-Duty Hybrid and Electric Vehicles9 Freight Operational Efficiency10 Intelligent Transportation Systems and Automation11 Manufacturing Considerations12 Costs and Benefits13 Alternative and Complementary Regulatory ApproachesAppendix A: Committee BiographiesAppendix B: Disclosure of Conflicts of InterestAppendix C: Committee ActivitiesAppendix D: Summary of Analysis of Engine and Vehicle CombinationsAppendix E: Description of Drive Cycles Used for ComplianceAppendix F: Summary of Committee's First Report: Reducing the Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two: First ReportAppendix G: Acronyms and Abbreviations

DKK 708.00

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Rails 4 in Action - Steve Klabnik - Bog - Manning Publications - Plusbog.dk

DESCRIPTION Ruby on Rails is an open source web framework. It''s famously simple to build a basic Rails application. Once you''ve started down the track, however, you discover that Rails is a powerful, deep, and rich full-stack platform capable of tackling virtually any development challenge. Rails 4 in Action is a fully-revised second edition of Rails 3 in Action . This hands-on, comprehensive introduction to Rails gives readers everything they need to become competent and confident Rails developers. It shows how to develop a ticket tracking application that includes RESTful routing, authentication and authorization, file uploads, email, and more. It explores powerful features like designing APIs and building a Rails engine. The book also provides Test Driven Development and Behavior Driven Development in action throughout the book—just like in a top Rails shop. RETAIL SELLING POINTS - - Fully updated for Rails 4 - - New and improved testing examples - - More options for creating APIs - - Written by Rails community leaders - AUDIENCE It is helpful for readers to have a background in Ruby, but no prior Rails experience is needed. ABOUT THE TECHNOLOGY Ruby on Rails, often called Rails, is an open source web framework for the Ruby programming language. It’s a full-stack platform capable of tackling virtually any development challenge.

DKK 406.00

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Mastering Ruby on Rails - - Bog - Taylor & Francis Ltd - Plusbog.dk

There is no shortage of programming languages and frameworks out there. But in the midst of all this, Ruby on Rails stands out. Despite losing out on the top spot to other contenders, Ruby on Rails has earned for itself a position of repute and a robust user base. Ever since its debut in 2004, Ruby on Rails has rapidly become one of the most impactful and popular tools for building dynamic web applications. Rails owes much of its success to its compact design and the usage of the underlying Ruby language. It effectively creates a domain-specific language for writing web applications. As a result, many common web programming tasks—such as generating HTML, making data models, and routing URLs—are easier with Rails. Although its outstanding capabilities have made Ruby on Rails one of the world’s most popular web development frameworks, some might still find it challenging to learn and use. Mastering Ruby on Rails: A Beginner’s Guide could be just the right solution for that. Whatever your previous web development experience is, Mastering Ruby on Rails can guide you to true Rails proficiency. It will help you to: - - Install and set up your Rails development environment - - - Go beyond generated code to build Rails applications from scratch - - - Effectively use the Model-View-Controller (MVC) pattern - - - Master the Ruby programming skills all Rails developers need - - - Define high-quality site layouts and data models - - - Add social features and navigate Asynchronous Javascript and XML (Ajax) - Mastering Ruby on Rails will walk you through Rails'' inner workings and equip you to tackle complicated projects with solutions that are well-tested, adaptive, and easy to maintain. This book starts by explaining critical points behind object-oriented programming and builds toward creating a full Rails application within a few chapters. By the end of this book, besides in-depth knowledge of Rails, you will also have a basic understanding of many supporting technologies such as SQL, web frameworks, and Integrated Development Environment (IDE). You will be able to quickly grasp the Rails methodology by focusing on the development from the point of view of the beginner-level developer. Additionally, you will be provided with a reliable roadmap for migrating your applications, skill set, and development procedures to the newer, more flexible programming platform that Rails offers. Moreover, learning Rails development independently will let you use all the qualities like creativeness, critical thinking, and project management. Mastering Ruby on Rails serves as a complete guide to exploring Ruby on Rails, expanding your set of skills and experience that will only benefit you throughout your professional life. If you are looking to get into the fascinating world of Rails development, Mastering Ruby on Rails is the right pick for you! Learn more about our other Mastering titles at: https://www.routledge.com/Mastering-Computer-Science/book-series/MCS

DKK 618.00

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Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles - National Research Council - Bog - National Academies

Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles evaluates various technologies and methods that could improve the fuel economy of medium- and heavy-duty vehicles, such as tractor-trailers, transit buses, and work trucks. The book also recommends approaches that federal agencies could use to regulate these vehicles' fuel consumption. Currently there are no fuel consumption standards for such vehicles, which account for about 26 percent of the transportation fuel used in the U.S. The miles-per-gallon measure used to regulate the fuel economy of passenger cars. is not appropriate for medium- and heavy-duty vehicles, which are designed above all to carry loads efficiently. Instead, any regulation of medium- and heavy-duty vehicles should use a metric that reflects the efficiency with which a vehicle moves goods or passengers, such as gallons per ton-mile, a unit that reflects the amount of fuel a vehicle would use to carry a ton of goods one mile. This is called load-specific fuel consumption (LSFC). The book estimates the improvements that various technologies could achieve over the next decade in seven vehicle types. For example, using advanced diesel engines in tractor-trailers could lower their fuel consumption by up to 20 percent by 2020, and improved aerodynamics could yield an 11 percent reduction. Hybrid powertrains could lower the fuel consumption of vehicles that stop frequently, such as garbage trucks and transit buses, by as much 35 percent in the same time frame.

DKK 416.00

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Vue on Rails - Richard Lafranchi - Bog - APress - Plusbog.dk

Build modern and progressive web applications with Vue.js and Ruby on Rails. As the Rails community embraces JavaScript, this book answers your most pressing questions, including how to integrate front-end technologies with Rails, whether to build a single-page application, when and how to use JavaScript in your project, how to scaffold a Vue component in Rails, and how to configure Vue.js in a Rails project. This book explores how to manage and understand priorities when working with Vue on Rails and how to determine the best configuration for your project. You''ll see how to reuse your Vue components in a Rails project with less coding and harness the component options, as well as how to use props, events and slots of Vue components. You''ll also use webpacker to set up your project and pass data from your Vue component to a Rails controller and back. Finally, you''ll learn which is the best configuration for the router and how to test and deploy your application. These topics are essential for developers and product owners because they cover end-to-end advice for building a web application incrementally or from scratch. Vue.js on Rails shows you just how easy it is to build and maintain a modern web app and save hundreds of hours integrating these two technologies. What You''ll Learn - Use Vue and Rails together to improve products - Build a web app with a focus on developer happiness - Take a pragmatic approach to web app development with practical code examples - Save time configuring Vue and Rails - Control and manage states in a Vue on Rails project Who This Book Is For Product owners seeking a technology for a company''s products with an emphasis on development scalability; business owners looking to maximize developer satisfaction and successful product development; technical managers requiring a pragmatic and successful web app development strategy;and new and experienced developers and designers learning to build web apps using the best tools available.

DKK 391.00

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Learn Rails 6 - Adam Notodikromo - Bog - APress - Plusbog.dk

Effectively learn and apply software development and engineering techniques to web application development using Rails 6 with this accelerated tutorial. This book teaches modern engineering practices including git flow, containerization, debugging, testing, and deployment. Along the way, you''ll see how to build a social network application and then deploy it on a cloud provider such as Amazon Web Services. After reading and using this book, you''ll be able to effectively build and deploy your Rails application to the cloud. You''ll also have used the Ruby on Rails framework to carry out the rapid development of an idea into a product without sacrificing quality. What You Will Learn - - Use the Ruby on Rails 6 web development framework - - Integrate Docker with your Ruby on Rails code - - Apply software engineering techniques to learning the Rails framework - - Design, build, and deploy a social networking application to the Amazon cloud - Who This Book Is For Beginners with at least some prior programming experience. Ruby experience is helpful, but not required.

DKK 604.00

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Rails Scales! - Cristian Planas - Bog - The Pragmatic Programmers - Plusbog.dk

Rails doesn''t scale. So say the naysayers. They’re wrong. Ruby on Rails runs some of the biggest sites in the world, impacting the lives of millions of users while efficiently crunching petabytes of data. This book reveals how they do it, and how you can apply the same techniques to your applications. Optimize everything necessary to make an application function at scale: monitoring, product design, Ruby code, software architecture, database access, caching, and more. Even if your app may never have millions of users, you reduce the costs of hosting and maintaining it. Optimize every aspect of your Ruby on Rails applications for world-class performance. Tweak your Rails app for snappy responsiveness. Find bottlenecks that slow your code. Scale an app for massive data sets. This book introduces techniques, patterns, and tricks to make your Rails application become more performant and scale to billions of requests per day. And it does it in an entertaining and fun way, sharing real-life stories of all kinds: tales from the trenches of working on massive Rails apps, and anecdotes from working on much smaller projects in tiny organizations of a handful of engineers. Through all these experiences you will learn that scaling Rails applications is a multifaceted task, including aspects such as monitoring, query tuning, and memory-aware coding. This book is for programmers of all levels of experience, from beginners to experienced Rails veterans. You can even show your nontechnical colleagues the features and limitations of Rails at scale. Reading this book will help you make Rails applications that fly. And it will make you enjoy the process.

DKK 451.00

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Beginning Rails 6 - Adam Gamble - Bog - APress - Plusbog.dk

Springboard your journey into web application development and discover how much fun building web applications with Ruby on Rails can be. This book has been revised to cover what''s new in Rails 6 including features such as WebPack, advanced JavaScript integration, Action Mailbox, Action Text, system and parallel testing, Action Cable testing, and more. Beginning Rails 6 gently guides you through designing your application, writing tests for the application, and then writing the code to make your application work as expected. It is a book that will guide you from never having programmed with Ruby, to having a Rails 6 application built and deployed to the web. After reading and using this book, you''ll have the know-how and the freely available source code to get started with your own Rails-based web development in days. What You Will Learn - - Create Ruby on Rails 6 web applications from the bottom up - Gain the basics of the Ruby programming language - Combine all the components of Rails to develop your own web applications - Apply TDD to make sure your application works exactly as you expect - Use Git source control and best practice techniques to create applications like a pro - Who This Book Is For Someone with little to no Ruby or Rails experience, or possibly even someone with no experience developing web applications at all. A basic familiarity with the web and typical web terms is assumed, but you don''t need to be an expert in these.

DKK 519.00

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Agile Web Development with Rails Revised - Sam Ruby - Bog - The Pragmatic Programmers - Plusbog.dk

Agile Web Development with Rails Revised

DKK 415.00

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Ruby on Rails Tutorial - Michael Hartl - Bog - Pearson Education (US) - Plusbog.dk

Used by sites as varied as Hulu, GitHub, Shopify, and Airbnb, Ruby on Rails is one of the most popular frameworks for developing web applications, but it can be challenging to learn and use. Whether you''re new to web development or new only to Rails, Ruby on RailsTM Tutorial, Seventh Edition, is the solution. Best-selling author and leading Rails developer Michael Hartl teaches Rails by guiding you through the development of three example applications of increasing sophistication. The tutorial''s examples focus on the general principles of web development needed for virtually any kind of website. The updates to this edition include full compatibility with Rails 7. This indispensable guide provides integrated tutorials not only for Rails, but also for the essential Ruby, HTML, CSS, and SQL skills you need when developing web applications. Hartl explains how each new technique solves a real-world problem, and then he demonstrates it with bite-sized code that''s simple enough to understand while still being useful. Whatever your previous web-development experience, this book will guide you to true Rails mastery. This book will help you - - Set up your Rails development environment - - Record version changes with Git and create a secure remote repository at GitHub - - Deploy your applications early and often with Heroku - - Go beyond generated code to truly understand how to build Rails applications from scratch - - Learn testing and test-driven development (TDD) - - Effectively use the model-view-controller (MVC) pattern - - Structure applications using the REST architecture - - Build static pages and transform them into dynamic ones - - Master the Ruby programming skills all Rails developers need - - Create high-quality site layouts and data models - - Implement registration and authentication systems, including validation and secure passwords - - Update, display, and delete users - - Upload and display images using Active Storage and Amazon S3 - - Implement account activation and password reset, including sending email with Rails - - Integrate JavaScript with Rails using Importmap - - Add social features and microblogging, including an introduction to Hotwire and Turbo - " Ruby on RailsTM Tutorial by Michael Hartl has become a must-read for developers learning how to build Rails apps." --Peter Cooper, Editor of Ruby Inside Gemfiles are available at https://gemfiles-7th-ed.railstutorial.org/ Code listings are available at https://github.com/learnenough/ruby_on_rails_tutorial_code_listings_7th_ed Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.

DKK 442.00

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Agile Web Development with Rails 8 - Sam Ruby - Bog - The Pragmatic Programmers - Plusbog.dk

The eighth major release of Rails focuses on the ability to produce production-ready applications. It achieves this while building upon and retaining the ability to produce fantastic user experiences, and achieves all the benefits of single-page applications at a fraction of the complexity. Rails 8 introduces Kamal 2, Thruster, new database adapters, replaces the asset pipeline, and adds a new authentication generator. The result is a toolkit so powerful that it allows a single individual to create modern applications upon which they can build a competitive business—the way it used to be. Ruby on Rails helps you produce high-quality, beautiful-looking web applications quickly—you concentrate on creating the application, and Rails takes care of the details. Rails 8 brings many improvements, and this edition is updated to cover the new features and changes in best practices. We start with a step-by-step walkthrough of building a real application. We look in depth at the built-in Rails features. Follow along with an extended tutorial as you write a web-based store application. Eliminate tedious configuration and housekeeping, seamlessly incorporate JavaScript, send and receive emails, manage background jobs with ActiveJob, and build real-time features using WebSockets and ActionCable. Test your applications as you write them using the built-in unit, integration, and system-testing frameworks; internationalize your applications; and deploy your applications easily and securely. Rails 1.0 was released in December 2005. This book was there from the start, and didn’t just evolve alongside Rails, it evolved with Rails. It has been developed in consultation with the Rails core team. In fact, Rails itself is tested against the code in this book. What You Need: All you need is a Windows, Mac OS X, or Linux machine to do development on. This book will take you through the steps to install Rails and its dependencies. If you aren’t familiar with the Ruby programming language, this book contains a chapter that covers the basics necessary to understand the material in the book.

DKK 581.00

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Agile Web Development with Rails 7.2 - Dave Thomas - Bog - The Pragmatic Programmers - Plusbog.dk

Rails 7.2 completely redefined what it means to produce fantastic user experiences and provides a way to achieve all the benefits of single-page applications - a fraction of the complexity. Rails 7.2 integrated the Hotwire frameworks of Stimulus and Turbo directly as the new defaults, together with that hot newness of import maps. The result is a toolkit so powerful that it allows a single individual to create modern applications upon which they can build a competitive business. The way it used to be. Ruby on Rails helps you produce high-quality, beautiful-looking web applications quickly - you concentrate on creating the application, and Rails takes care of the details. Rails 7.2 brings many improvements, and this edition is updated to cover the new features and changes in best practices. We start with a step-by-step walkthrough of building a real application, and in-depth chapters look at the built-in Rails features. Follow along with an extended tutorial as you write a web-based store application. Eliminate tedious configuration and housekeeping, seamlessly incorporate JavaScript, send and receive emails, manage background jobs with ActiveJob, and build real-time features using WebSockets and ActionCable. Test your applications as you write them using the built-in unit, integration, and system testing frameworks, internationalize your applications, and deploy your applications easily and securely. Rails 1.0 was released in December 2005. This book was there from the start, and didn''t just evolve alongside Rails, it evolved with Rails. It has been developed in consultation with the Rails core team. In fact, Rails itself is tested against the code in this book. What You Need: All you need is a Windows, Mac OS X, or Linux machine to do development on. This book will take you through the steps to install Rails and its dependencies. If you aren''t familiar with the Ruby programming language, this book contains a chapter that covers the basics necessary to understand the material in the book.

DKK 529.00

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Learning Rails 5 - Eric J. Gruber - Bog - O'Reilly Media - Plusbog.dk

If you're a web developer or designer ready to learn Ruby on Rails, this hands-on guide is the ideal way to get started. Rather than toss you into the middle of the framework's Model-View-Controller architecture, as many books do, Learning Rails 5 begins with the foundations of the Web you already know.

DKK 413.00

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Rails 5 Test Prescriptions - Noel Rappin - Bog - Pragmatic Bookshelf - Plusbog.dk

Rails 5 Test Prescriptions - Noel Rappin - Bog - Pragmatic Bookshelf - Plusbog.dk - vi har over 400.000 produkter på webshoppen. Fri fragt og fremragende score på TP

DKK 438.00

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Modern Front-End Development for Rails, Second Edition - Noel Rappin - Bog - The Pragmatic Programmers - Plusbog.dk

Improve the user experience for your Rails app with rich, engaging client-side interactions. Learn to use the Rails 7 tools and simplify the complex JavaScript ecosystem. It''s easier than ever to build user interactions with Hotwire, Turbo, and Stimulus. You can add great front-end flair without much extra complication. Use React to build a more complex set of client-side features. Structure your code for different levels of client-side needs with these powerful options. Add to your toolkit today! It''s hard to have a Rails application without integrating some client-side logic. But client-side coding tools, and the Rails tools for integrating with them, all change continuously. Rails 7 simplifies client-side integration with the Hotwire gem. It''s a great way to build client interaction with server-side HTML and a small amount of JavaScript. In the latest edition of this book, learn how to use Rails 7 and its front-end bundling tools to build rich front-end logic into your Rails applications. The job is even easier with Stimulus, a library that brings Rails conventions to JavaScript tools. And you can also add in React, a larger framework that automatically updates the browser when your data changes. Learn the basics of Turbo, Stimulus, and TypeScript, and add pizazz to your application. Structure your web application to best manage your state. Learn how to interact with data on the server while still keeping the user experience interactive. Use the type system in TypeScript to expand on JavaScript and help prevent error conditions. Debug and test your front-end application with tools specific to each framework. There are a lot of ways to do client-side coding, and Rails is here to help. What You Need: This book requires Ruby on Rails 7.0 or later, React 17.0.0 or later. Other dependencies will be added by Rails.

DKK 485.00

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Rails Through the Clay - Desmond F. Croome - Bog - Taylor & Francis Ltd - Plusbog.dk

Rails Through the Clay - Desmond F. Croome - Bog - Taylor & Francis Ltd - Plusbog.dk - vi har over 400.000 produkter på webshoppen. Fri fragt og fremragende score på TP

DKK 541.00

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Agile Web Development with Rails 5.1 - Dave Thomas - Bog - Pragmatic Bookshelf - Plusbog.dk

Agile Web Development with Rails 5.1 - Dave Thomas - Bog - Pragmatic Bookshelf - Plusbog.dk - vi har over 400.000 produkter på webshoppen. Fri fragt og fremragende score på TP

DKK 518.00

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Rails - Barry Taylor - Bog - Bloomsbury Publishing PLC - Plusbog.dk

This is a guide to rails, a relatively homogenous family of birds spread throughout the world. Most species are solitary and somewhat secretive, and therefore high on the wanted lists of many birders, but the moorhens and coots are generally common and familiar birds of wetlands.

DKK 576.00

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Agile Web Development with Rails 7 - Sam Ruby - Bog - The Pragmatic Programmers - Plusbog.dk

Agile Web Development with Rails 7 - Sam Ruby - Bog - The Pragmatic Programmers - Plusbog.dk - vi har over 400.000 produkter på webshoppen. Fri fragt og fremragende score på TP

DKK 519.00

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Agile Web Development with Rails 6 - David Copeland - Bog - The Pragmatic Programmers - Plusbog.dk

Agile Web Development with Rails 6 - David Copeland - Bog - The Pragmatic Programmers - Plusbog.dk - vi har over 400.000 produkter på webshoppen. Fri fragt og fremragende score på TP

DKK 499.00

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Death Rode the Rails - Mark Aldrich - Bog - Johns Hopkins University Press - Plusbog.dk

A fascinating account of one of America's most important industries and its dangers, Death Rode the Rails will appeal to scholars of economics and the history of transportation, technology, labor, regulation, safety, and business, as well as to railroad enthusiasts.

DKK 593.00

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High Performance PostgreSQL for Rails - Andrew Atkinson - Bog - Pragmatic Bookshelf - Plusbog.dk

Build faster, more reliable Rails apps by taking the best advanced PostgreSQL and Active Record capabilities, and using them to solve your application scale and growth challenges. Gain the skills needed to comfortably work with multi-terabyte databases, and with complex Active Record, SQL, and specialized Indexes. Develop your skills with PostgreSQL on your laptop, then take them into production, while keeping everything in sync. Make slow queries fast, perform any schema or data migration without errors, use scaling techniques like read/write splitting, partitioning, and sharding, to meet demanding workload requirements from Internet scale consumer apps to enterprise SaaS. Deepen your firsthand knowledge of high-scale PostgreSQL databases and Ruby on Rails applications with dozens of practical and hands-on exercises. Unlock the mysteries surrounding complex Active Record. Make any schema or data migration change confidently, without downtime. Grow your experience with modern and exclusive PostgreSQL features like SQL Merge, Returning, and Exclusion constraints. Put advanced capabilities like Full Text Search and Publish Subscribe mechanisms built into PostgreSQL to work in your Rails apps. Improve the quality of the data in your database, using the advanced and extensible system of types and constraints to reduce and eliminate application bugs. Tackle complex topics like how to improve query performance using specialized indexes. Discover how to effectively use built-in database functions and write your own, administer replication, and make the most of partitioning and foreign data wrappers. Use more than 40 well-supported open source tools to extend and enhance PostgreSQL and Ruby on Rails. Gain invaluable insights into database administration by conducting advanced optimizations - including high-impact database maintenance - all while solving real-world operational challenges. Take your new skills into production today and then take your PostgreSQL and Rails applications to a whole new level of reliability and performance. What You Need: - A computer running macOS, Linux, or Windows and WSL2 - PostgreSQL version 16, installed by package manager, compiled, or running with Docker - An Internet connection

DKK 559.00

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Rails Under the Mighty Hudson - Brian J. Cudahy - Bog - Fordham University Press - Plusbog.dk

Rails Under the Mighty Hudson tells a story that begins in the final years of the nineteenth century and reaches fulfillment in the first decade of the twentieth: namely, the building of rail tunnels under the Hudson River linking New Jersey and New York.

DKK 573.00

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Agile Web Development with Rails - David Heinemeier Hansson - Bog - The Pragmatic Programmers - Plusbog.dk

Rails is an open-source web framework, with integrated support for unit, functional, and integration testing. It enforces good design principles, consistency of code across your team (and across your organization), and proper release management. This book helps you learn how to use ActiveRecord to connect business objects and database tables.