Storage Retrieval

Download Getting Started with LevelDB by Andy Dent PDF

Posted On April 11, 2017 at 8:38 am by / Comments Off on Download Getting Started with LevelDB by Andy Dent PDF

By Andy Dent

Store and retrieve key-value established information speedy on iOS and OS X utilizing LevelDB


  • Understand how a taken care of key-value shop like LevelDB can help any app.
  • Learn to take advantage of LevelDB from uncomplicated C++ code on iOS and OS/X
  • Use LevelDB as a help for any OS/X, iPhone, or iPad app via a chain of useful examples

In Detail

Mobile and standalone computing device apps usually have to shop and quickly retrieve information. LevelDB scales from a number of uncomplicated values as much as trillions of files and is versatile adequate to shop any type of data.

Getting begun with LevelDB progresses during the refined how you can use databases. It begins by means of explaining tips to set up and construct LevelDB from the fundamentals, and strikes directly to clarify the various Objective-C layers for LevelDB. it may be used as an creation to database-backed iOS apps, in addition to presents explanation to key-value shops and is helping you know how they relate to SQL.

LevelDB is a versatile information resolution that makes use of key-value shops to permit for the improvement of hugely complicated, effective information garage platforms. From the fundamentals of knowledge garage and retrieval to complicated circumstances concerning facts garage for apps, this ebook covers quite a lot of LevelDB topics.

Even particularly easy apps could have the necessity to seek their info utilizing varied phrases. Getting begun with LevelDB indicates how you can layout keys to retrieve and shop info successfully. you are going to find out how its “levelled” nature can provide quickly writes and the way to song its settings and layout for functionality. additionally, you will see a couple of recommendations for debugging and tuning.

Getting begun with LevelDB will depart you as an finished LevelDB programmer, convinced you could construct a posh database-backed app with excessive functionality on iOS or OS/X.

What you are going to study from this book

  • Install LevelDB and software in C++ or Objective-C to construct OS/X, iPhone, and iPad apps
  • Extend uncomplicated taken care of key-value shops to help graph and relational information kinds
  • Understand iOS interface development for an app that makes use of databases
  • Learn the GUI styles wanted for a database-backed app
  • Explore debugging positive factors by means of including an embedded net server on your iOS app
  • Install extra libraries and spot the right way to use LevelDB from JavaScript through Node in addition to Ruby and Python
  • Compare SQL to LevelDB together with SQL-like relational schemas and study the implementation duties to take care of database integrity


The ebook is a concise advisor for utilizing LevelDB. It explains database strategies and using C++, starting from the fundamentals the entire solution to excessive point themes in a simple to persist with, step by step layout.

Who this e-book is written for

The ebook is intended for builders who wish an embedded database for his or her functions. skilled programmers can decide up at the subtle info mapping styles and tuning tips.

Getting begun with LevelDB calls for a minimum historical past in programming in C++ or Objective-C for OS/X or iOS and familiarity with XCode. for that reason it teaches adequate C++ to take advantage of LevelDB with out presuming any C++ wisdom, so is acceptable for newbie Objective-C programmers.

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Extra resources for Getting Started with LevelDB

Sample text

Using Objective-C Open source wrappers for LevelDB in Objective-C Using Objective-C for simple data access Extending APLevelDB to expose the C++ API Importing text data to load a database Summary 6. Integrating with a Cocoa UI Meeting the data source needs with LevelDB Creating the OS X GUI Connecting the database to the NSTableView Connecting record details to the editing form Recommended Xcode books Summary 7. js and the lev utility Adding a REPL for debugging inside your iOS app Summary 8. Richer Keys and Data Structures Completing the data source for a rich GUI Extending the OS X GUI to fully support editing Connecting the database to the NSTableView Connecting record details to the editing form Saving data with key updates Responding to the new and delete commands Key design for LevelDB versus relational theory and SQL Deciding when to store one record or split values Implementing schemas for LevelDB Dealing with integer key endianness Using comparators to vary key ordering Summary 9.

This principle is the same as a relational database; key values for other searches are contained in a record. This example only has one kind of a record data. In the next chapter, we will use this technique to build a secondary index where phone number keys are used to find the main record key. If you need to find data, adding multiple keys is the only way to achieve speed. Summary In this chapter, we learned the concept of an iterator in LevelDB as a way to step through records sorted by their keys.

Open source wrappers for LevelDB in Objective-C There are three significant Objective-C wrappers for LevelDB, all started in 2011 when it was announced. They are the top hits and links if searching for Objective-C LevelDB. 6 or higher. These two include a valuable suite of unit tests in each but not examples for iOS. Their relative popularity is hard to judge. Instead of trying to fix their builds, our downloadable Sample05 has OS X and iOS projects with all three wrappers' source included and a common set of tests.

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