Getting Started with CouchDB by MC Brown

By MC Brown

CouchDB is a brand new breed of database for the web, geared to satisfy the wishes of today’s dynamic net purposes. With this concise creation, you’ll learn the way CouchDB’s basic version for storing, processing, and gaining access to information makes it perfect for the kind of facts and swift reaction clients now call for out of your applications—and how effortless CouchDB is to establish, set up, continue, and scale.

The code-packed examples during this ebook can help you paintings with files, populate an easy database, mirror information from one database to a different, and a number of different tasks.
* set up CouchDB on Linux, Mac OS X, home windows, or (if you need to) from the resource code
* have interaction with information via CouchDB’s RESTful API, and use regular HTTP operations, corresponding to placed, GET, submit, and DELETE
* Use Futon—CouchDB’s web-based interface— to control databases and records, and to configure replications
* the way to create, replace, and delete records in JSON structure, and the way to create and delete databases
* paintings with layout files to get the formatting and indexing your software calls for

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Example text

Where possible, you should be as specific as you can. Request Headers Content-type Specifies the content type of the information being supplied within the request. The specification uses MIME type specifications. For the majority of requests this will be JSON (application/json). For some settings, the MIME type will be plain text. When uploading attachments, it should be the corresponding MIME type for the attachment or binary (application/octet-stream). The use of the Content-type on a request is highly recommended.

To keep the speed of the database when creating and writing documents, the index for a view is not updated when the document is written. This is because, in real terms, this is not the point at which indexing is really useful. The update doesn’t need or use the update. Instead, when you access a view, the view is generated and the index is updated. The first time you access a new view on a database, the entire contents of the database are processed through the view. If you then update, delete, and add new records and access the view again, only the changed documents are updated in the generated index.

Unlike document validation, update handlers are explicitly called, but they can be used to make changes to a document within the server without having to retrieve the document, change it, and save it back (as would be required for a client process). For example, you can use update handlers to increment values in a document, or add and update timestamps. Filters When exchanging information between CouchDB databases when using replication or the changes feed, you may want to filter the content of the database.

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