Writing and Querying MapReduce Views in CouchDB - Helion
ISBN: 978-14-493-0389-1
stron: 106, Format: ebook
Data wydania: 2011-01-28
Księgarnia: Helion
Cena książki: 63,74 zł (poprzednio: 74,99 zł)
Oszczędzasz: 15% (-11,25 zł)
If you want to use CouchDB to support real-world applications, you'll need to create MapReduce views that let you query this document-oriented database for meaningful data. With this short and concise ebook, you'll learn how to create a variety of MapReduce views to help you query and aggregate data in CouchDB’s large, distributed datasets.
You'll get step-by-step instructions and lots of sample code to create and explore several MapReduce views through the course of the book, using an example database you construct. To work with these different views, you’ll learn how to use the Futon web administration console and the cURL command line tool that come with CouchDB.
- Learn how the Map and Reduce steps work independently and together to index your data
- Use the example database to create several temporary views based on different criteria
- Discover the uses of Map and Reduce JavaScript functions
- Convert your temporary views to permanent views within a design document
- Learn several options for querying the data within your views
- Limit the number of results returned, skip some results, or reverse the order of the output
- Group your results by exact keys or by parts of keys
Bradley Holt, co-founder of the creative services firm Found Line, is a web developer and entrepreneur ten years of PHP and MySQL experience. He began using CouchDB before the release of version 1.0. Bradley is an active member of the PHP community, and can be reached at bradley-holt.com.
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Spis treści
Writing and Querying MapReduce Views in CouchDB eBook -- spis treści
- Writing and Querying MapReduce Views in CouchDB
- SPECIAL OFFER: Upgrade this ebook with OReilly
- Preface
- Conventions Used in This Book
- Using Code Examples
- Safari Books Online
- How to Contact Us
- Content Updates
- October 19, 2011
- Acknowledgments
- 1. Introduction
- Resources for Installing CouchDB
- Futon
- HTTP API
- cURL
- JSON
- 2. MapReduce
- Temporary Views
- Map
- One-To-One Mapping
- One-To-Many Mapping
- Conclusion
- Reduce
- Count
- Sum
- Stats
- Custom Reduce Functions
- Limitations of MapReduce
- 3. Design Documents
- Titles View
- Formats View
- Authors View
- Storage Considerations
- 4. Querying Views
- Range Queries
- Rows by Start and End Keys
- Rows by Key
- Rows by Start and End Keys and Document IDs
- Limiting, Skipping, and Reversing Results
- Limit
- Skip
- Reversing Output
- Grouping
- Exact Grouping
- Group Levels
- Including Documents
- Range Queries
- 5. MapReduce Views for SQL Users
- Documents
- Views
- Compound Keys
- Relationships
- One to Many
- Embedded JSON array
- Related documents
- Many to Many
- List of keys
- Books and related author data
- Authors and related book data
- Books and related author references
- Authors and related book references
- Relationship document
- Books and related authors
- Authors and related books
- List of keys
- One to Many
- About the Author
- SPECIAL OFFER: Upgrade this ebook with OReilly