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Python interface for groonga

Project description

What’s this?

Python interface for groonga fulltext search engine.

Requirements

  • Python 2.6 or 3.x and later
  • groonga

Installation

from pypi:

% pip install pyroonga

from source:

% python setup.py install

Usage

First, Please run groonga by server mode or daemon mode. see folowing:

# server mode
% groonga -s DB_PATH_NAME

# daemon mode
% groonga -d DB_PATH_NAME

See groonga --help for more options.

Create Table

from pyroonga import tablebase, Column, Groonga

# create the base class for table definition.
Table = tablebase()

# define the table
class Site(Table):
   title = Column()
   name = Column()

class Blog(Table):
   entry = Column()

# create and bind the groonga connection object
grn = Groonga()
Table.bind(grn)

# create the all table on groonga's database
Table.create_all()

Query and get data as a mapped object

Get the all data from Site table:

data = Site.select().all()

And print the data:

for row in data:
    print(row._id, row._key, row.title)

Fulltext search query:

Site.select(title='foo').all()
Site.select(title='foo', name='bar').all()  # "or" search

The above is the same as a following groonga query:

select --table Site --query "title:@\"foo\""

Conditional search query:

Site.select(Site.title == 'bar').all()

Conbination for a condition:

Site.select((Site._id > 3) & (Site.title == 'baz')).all()

Limit and offset:

Site.select().limit(3).offset(2).all()

Sortby:

Site.select().sortby(Site._id).all()   # asc
Site.select().sortby(-Site._id).all()  # desc

Select the output columns:

# get the title and name columns
Site.select().output_columns(Site.title, Site.name).all()

# get the all columns
Site.select().output_columns(Site.ALL).all()

Drilldown

Switch to the drilldown query after the call of drilldown() from select() method chain:

data = Site.select().sortby(Site._key).drilldown(Site.title).all()

Result of drilldown will be stored to the drilldown attribute of the return value from all() method:

for drilldown in data.drilldown:
    print(drilldown._key, drilldown._nsubrecs)

A sortby() method in example above, It is query option of --sortby. For sortby of drilldown, Please call of sortby() method after the call of drilldown() method:

Site.select().drilldown(Site.title).sortby(Site._key).all()

A sortby() method in example above, It is query option of --drilldown_sortby. Of course, As well as limit() , offset() and output_columns() methods.

Other

However, Data load is not yet implemented. And more documents is still not written.

LICENSE

pyroonga is licensed under the BSD license.

Changelog

v0.2 (2012-02-17)

  • Add ORM
  • Add documentation of basic usage

v0.1 (2012-02-05)

  • First release

Project details


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