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#!/usr/bin/env python |
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# -*- encoding: utf-8 -*- |
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# vim: set et sw=4 ts=4 sts=4 ff=unix fenc=utf8: |
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# Author: Binux<[email protected]> |
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# http://binux.me |
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# Created on 2012-08-30 17:43:49 |
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from __future__ import unicode_literals, division, absolute_import |
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import logging |
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logger = logging.getLogger('database.basedb') |
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from six import itervalues |
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from pyspider.libs import utils |
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class BaseDB: |
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''' |
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BaseDB |
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dbcur should be overwirte |
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''' |
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__tablename__ = None |
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placeholder = '%s' |
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maxlimit = -1 |
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@staticmethod |
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def escape(string): |
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return '`%s`' % string |
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@property |
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def dbcur(self): |
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raise NotImplementedError |
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def _execute(self, sql_query, values=[]): |
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dbcur = self.dbcur |
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dbcur.execute(sql_query, values) |
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return dbcur |
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def _select(self, tablename=None, what="*", where="", where_values=[], offset=0, limit=None): |
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tablename = self.escape(tablename or self.__tablename__) |
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if isinstance(what, list) or isinstance(what, tuple) or what is None: |
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what = ','.join(self.escape(f) for f in what) if what else '*' |
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sql_query = "SELECT %s FROM %s" % (what, tablename) |
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if where: |
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sql_query += " WHERE %s" % where |
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if limit: |
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sql_query += " LIMIT %d, %d" % (offset, limit) |
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elif offset: |
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sql_query += " LIMIT %d, %d" % (offset, self.maxlimit) |
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logger.debug("<sql: %s>", sql_query) |
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for row in self._execute(sql_query, where_values): |
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yield row |
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def _select2dic(self, tablename=None, what="*", where="", where_values=[], |
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order=None, offset=0, limit=None): |
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tablename = self.escape(tablename or self.__tablename__) |
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if isinstance(what, list) or isinstance(what, tuple) or what is None: |
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what = ','.join(self.escape(f) for f in what) if what else '*' |
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sql_query = "SELECT %s FROM %s" % (what, tablename) |
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if where: |
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sql_query += " WHERE %s" % where |
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if order: |
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sql_query += ' ORDER BY %s' % order |
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if limit: |
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sql_query += " LIMIT %d, %d" % (offset, limit) |
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elif offset: |
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sql_query += " LIMIT %d, %d" % (offset, self.maxlimit) |
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logger.debug("<sql: %s>", sql_query) |
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dbcur = self._execute(sql_query, where_values) |
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# f[0] may return bytes type |
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# https://github.com/mysql/mysql-connector-python/pull/37 |
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fields = [utils.text(f[0]) for f in dbcur.description] |
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for row in dbcur: |
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yield dict(zip(fields, row)) |
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def _replace(self, tablename=None, **values): |
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tablename = self.escape(tablename or self.__tablename__) |
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if values: |
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_keys = ", ".join(self.escape(k) for k in values) |
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_values = ", ".join([self.placeholder, ] * len(values)) |
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sql_query = "REPLACE INTO %s (%s) VALUES (%s)" % (tablename, _keys, _values) |
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else: |
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sql_query = "REPLACE INTO %s DEFAULT VALUES" % tablename |
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logger.debug("<sql: %s>", sql_query) |
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if values: |
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dbcur = self._execute(sql_query, list(itervalues(values))) |
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else: |
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dbcur = self._execute(sql_query) |
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return dbcur.lastrowid |
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def _insert(self, tablename=None, **values): |
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tablename = self.escape(tablename or self.__tablename__) |
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if values: |
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_keys = ", ".join((self.escape(k) for k in values)) |
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_values = ", ".join([self.placeholder, ] * len(values)) |
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sql_query = "INSERT INTO %s (%s) VALUES (%s)" % (tablename, _keys, _values) |
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else: |
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sql_query = "INSERT INTO %s DEFAULT VALUES" % tablename |
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logger.debug("<sql: %s>", sql_query) |
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if values: |
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dbcur = self._execute(sql_query, list(itervalues(values))) |
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else: |
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dbcur = self._execute(sql_query) |
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return dbcur.lastrowid |
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def _update(self, tablename=None, where="1=0", where_values=[], **values): |
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tablename = self.escape(tablename or self.__tablename__) |
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_key_values = ", ".join([ |
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"%s = %s" % (self.escape(k), self.placeholder) for k in values |
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]) |
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sql_query = "UPDATE %s SET %s WHERE %s" % (tablename, _key_values, where) |
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logger.debug("<sql: %s>", sql_query) |
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return self._execute(sql_query, list(itervalues(values)) + list(where_values)) |
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def _delete(self, tablename=None, where="1=0", where_values=[]): |
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tablename = self.escape(tablename or self.__tablename__) |
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sql_query = "DELETE FROM %s" % tablename |
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if where: |
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sql_query += " WHERE %s" % where |
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logger.debug("<sql: %s>", sql_query) |
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return self._execute(sql_query, where_values) |
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if __name__ == "__main__": |
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import sqlite3 |
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class DB(BaseDB): |
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__tablename__ = "test" |
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placeholder = "?" |
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def __init__(self): |
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self.conn = sqlite3.connect(":memory:") |
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cursor = self.conn.cursor() |
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cursor.execute( |
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'''CREATE TABLE `%s` (id INTEGER PRIMARY KEY AUTOINCREMENT, name, age)''' |
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% self.__tablename__ |
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) |
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@property |
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def dbcur(self): |
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return self.conn.cursor() |
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db = DB() |
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assert db._insert(db.__tablename__, name="binux", age=23) == 1 |
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assert db._select(db.__tablename__, "name, age").next() == ("binux", 23) |
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assert db._select2dic(db.__tablename__, "name, age").next()["name"] == "binux" |
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assert db._select2dic(db.__tablename__, "name, age").next()["age"] == 23 |
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db._replace(db.__tablename__, id=1, age=24) |
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assert db._select(db.__tablename__, "name, age").next() == (None, 24) |
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db._update(db.__tablename__, "id = 1", age=16) |
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assert db._select(db.__tablename__, "name, age").next() == (None, 16) |
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db._delete(db.__tablename__, "id = 1") |
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assert [row for row in db._select(db.__tablename__)] == [] |
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binux /
pyspider
