From: Javier Sancho Date: Fri, 17 Jan 2014 15:30:21 +0000 (+0100) Subject: Initial commit X-Git-Url: https://git.jsancho.org/?p=mojodb.git;a=commitdiff_plain;h=220f54d95c0f0cad16882f379748c1164adc7c84 Initial commit --- 220f54d95c0f0cad16882f379748c1164adc7c84 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/MySQL.py b/MySQL.py new file mode 100644 index 0000000..76f7312 --- /dev/null +++ b/MySQL.py @@ -0,0 +1,76 @@ +# -*- coding: utf-8 -*- +############################################################################## +# +# mojo, a Python library for implementing document based databases +# Copyright (C) 2013-2014 by Javier Sancho Fernandez +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# +############################################################################## + +import mojo +import MySQLdb + +class Connection(mojo.Connection): + def __init__(self, *args, **kwargs): + self._db_con = MySQLdb.connect(*args, **kwargs) + + def query(self, sql): + cur = self._db_con.cursor() + cur.execute(sql) + res = cur.fetchall() + cur.close() + cur = None + return res + + def _get_databases(self): + return [x[0] for x in self.query("SHOW DATABASES")] + + def _get_tables(self, db_name): + return [x[0] for x in self.query("SHOW TABLES FROM `%s`" % db_name)] + + def _count_rows(self, db_name, table_name): + return self.query("SELECT COUNT(*) FROM `%s`.`%s`" % (db_name, table_name))[0][0] + + def _get_sql_field(self, db_name, field): + if type(field) is tuple: + return "`%s`.`%s`.`%s`" % (db_name, field[0], field[1]) + elif type(field) is dict: + return "(%s)" % self._get_sql_query(db_name, field) + else: + return str(field) + + def _get_sql_query(self, db_name, query): + sql = "SELECT " + sql += ",".join([self._get_sql_field(db_name, x) for x in query['select']]) + + sql += " FROM " + sql += ",".join(query['from']) + + if query.get('where'): + sql += " WHERE " + where = [] + for cond in query['where']: + where.append("%s %s %s" % (self._get_sql_field(db_name, cond[0]), cond[1], self._get_sql_field(db_name, cond[2]))) + sql += " AND ".join(where) + + return sql + + def _get_cursor(self, db_name, query): + cur = self._db_con.cursor() + cur.execute(self._get_sql_query(db_name, query)) + return cur + + def _next(self, cur): + return cur.fetchone() diff --git a/__init__.py b/__init__.py new file mode 100644 index 0000000..36efb41 --- /dev/null +++ b/__init__.py @@ -0,0 +1,22 @@ +# -*- coding: utf-8 -*- +############################################################################## +# +# mojo, a Python library for implementing data flows in MongoDB +# Copyright (C) 2013 by Javier Sancho Fernandez +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# +############################################################################## + +from mojo import Connection diff --git a/mojo.py b/mojo.py new file mode 100644 index 0000000..aed9ec6 --- /dev/null +++ b/mojo.py @@ -0,0 +1,184 @@ +# -*- coding: utf-8 -*- +############################################################################## +# +# mojo, a Python library for implementing document based databases +# Copyright (C) 2013-2014 by Javier Sancho Fernandez +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# +############################################################################## + + +class Connection(object): + def __init__(self, *args, **kwargs): + self._db_con = None + + def __getattr__(self, db_name): + return Database(self, db_name) + + def __getitem__(self, *args, **kwargs): + return self.__getattr__(*args, **kwargs) + + def __repr__(self): + return "Connection(%s)" % self._db_con + + def _get_databases(self): + return [] + + def database_names(self): + return [unicode(x) for x in self._get_databases()] + + def _get_tables(self, db_name): + return [] + + def collection_names(self, db_name): + return list(set([unicode(x.split('$')[0]) for x in filter(lambda x: '$' in x, self._get_tables(db_name))])) + + def _count_rows(self, db_name, table_name): + return 0 + + def _count(self, db_name, table_name): + try: + return self._count_rows(db_name, table_name + '$_id') + except: + return 0 + + def _get_cursor(self, db_name, query): + # {'select': [('t1$_id', 'id'), {'select': [('t1$c1', 'value')], 'from': ['t1$c1'], 'where': [(('t1$c1', 'id'), '=', ('t1$_id', 'id'))]}], 'from': ['t1$_id']} + return None + + def _next(self, cursor): + return None + + +class Database(object): + def __init__(self, connection, db_name): + self.connection = connection + self.db_name = unicode(db_name) + + def __getattr__(self, table_name): + return Collection(self, table_name) + + def __getitem__(self, *args, **kwargs): + return self.__getattr__(*args, **kwargs) + + def __repr__(self): + return "Database(%r, %r)" % (self.connection, self.db_name) + + def collection_names(self): + return self.connection.collection_names(self.db_name) + + +class Collection(object): + def __init__(self, database, table_name): + self.database = database + self.table_name = unicode(table_name) + + def __repr__(self): + return "Collection(%r, %r)" % (self.database, self.table_name) + + def _get_fields(self): + tables = self.database.connection._get_tables(self.database.db_name) + return [unicode(x[x.find('$')+1:]) for x in filter(lambda x: x.startswith('%s$' % self.table_name), tables)] + + def count(self): + return self.database.connection._count(self.database.db_name, self.table_name) + + def find(self, *args, **kwargs): + return Cursor(self, *args, **kwargs) + + +class Cursor(object): + def __init__(self, collection, spec=None, fields=None, **kwargs): + self.collection = collection + self.spec = spec + self.fields = self._get_fields(fields) + self.cursor = self._get_cursor() + + def __iter__(self): + return self + + def _get_fields(self, fields): + set_all_fields = set(self.collection._get_fields()) + if fields is None: + res_fields = list(set_all_fields) + elif type(fields) is dict: + fields_without_id = filter(lambda x: x[0] != '_id', fields.iteritems()) + if fields_without_id[0][1]: + first = True + res_fields = set() + else: + first = False + res_fields = set(set_all_fields) + for f in fields_without_id: + if f[1] and f[0] in set_all_fields: + if first: + res_fields.add(f[0]) + else: + raise Exception(Errors['mix_fields_error']) + elif not f[1]: + if not first: + res_fields.discard(f[0]) + else: + raise Exception(Errors['mix_fields_error']) + if '_id' in fields and not fields['_id']: + res_fields.discard('_id') + else: + res_fields.add('_id') + res_fields = list(res_fields) + else: + set_fields = set(list(fields)) + set_fields.add('_id') + res_fields = list(set_all_fields.intersection(set_fields)) + + return res_fields + + def _get_cursor(self): + query = {} + table_id = '%s$_id' % self.collection.table_name + + query['select'] = [(table_id, 'id')] + for f in filter(lambda x: x != '_id', self.fields): + table_f = '%s$%s' % (self.collection.table_name, f) + q = {} + q['select'] = [(table_f, 'value')] + q['from'] = [table_f] + q['where'] = [((table_f, 'id'), '=', (table_id, 'id'))] + query['select'].append(q) + + query['from'] = [table_id] + + return self.collection.database.connection._get_cursor(self.collection.database.db_name, query) + + def next(self): + if self.cursor: + res = self.collection.database.connection._next(self.cursor) + if res is None: + raise StopIteration + else: + document = {} + if '_id' in self.fields: + document['_id'] = res[0] + fields_without_id = filter(lambda x: x != '_id', self.fields) + for i in xrange(len(fields_without_id)): + if not res[i + 1] is None: + document[fields_without_id[i]] = res[i + 1] + return document + else: + return None + + +Errors = { + 'mix_fields_error': 'You cannot currently mix including and excluding fields. Contact us if this is an issue.', + }