204 lines
6.5 KiB
Python
204 lines
6.5 KiB
Python
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# -*- coding: utf-8 -*-
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""" PostgreSQL client """
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import datetime
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import logging
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import sys
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import psycopg2
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log = logging.getLogger(__name__)
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class PgDB:
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""" PostgreSQL client """
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host = ""
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user = ""
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pwd = ""
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db = ""
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con = 0
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date_format = '%Y-%m-%d'
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datetime_format = '%Y-%m-%d %H:%M:%S'
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def __init__(self, host, user, pwd, db, just_try=False):
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self.host = host
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self.user = user
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self.pwd = pwd
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self.db = db
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self.just_try = just_try
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def connect(self):
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""" Connect to PostgreSQL server """
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if self.con == 0:
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try:
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con = psycopg2.connect("dbname='%s' user='%s' host='%s' password='%s'" % (self.db,self.user,self.host,self.pwd))
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self.con = con
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except Exception:
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log.fatal('An error occured during Postgresql database connection.', exc_info=1)
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sys.exit(1)
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def close(self):
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""" Close connection with PostgreSQL server (if opened) """
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if self.con:
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self.con.close()
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def setEncoding(self, enc):
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""" Set connection encoding """
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if self.con:
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try:
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self.con.set_client_encoding(enc)
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return True
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except Exception:
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log.error('An error occured setting Postgresql database connection encoding to "%s"', enc, exc_info=1)
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return False
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def doSQL(self, sql, params=None):
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""" Run SELECT SQL query and return result as dict """
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if self.just_try:
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log.debug(u"Just-try mode : do not really execute SQL query '%s'", sql)
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return True
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cursor = self.con.cursor()
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try:
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if params is None:
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cursor.execute(sql)
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else:
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cursor.execute(sql, params)
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self.con.commit()
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return True
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except Exception:
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log.error(u'Error during SQL request "%s"', sql.decode('utf-8', 'ignore'), exc_info=1)
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self.con.rollback()
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return False
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def doSelect(self, sql):
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""" Run SELECT SQL query and return result as dict """
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cursor = self.con.cursor()
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try:
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cursor.execute(sql)
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results = cursor.fetchall()
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return results
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except Exception:
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log.error(u'Error during SQL request "%s"', sql.decode('utf-8', 'ignore'), exc_info=1)
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return False
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#
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# SQL helpers
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#
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def _quote_value(self, value):
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""" Quote a value for SQL query """
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if isinstance(value, (int, float)):
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return str(value)
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if isinstance(value, datetime.datetime):
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value = self._format_datetime(value)
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elif isinstance(value, datetime.date):
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value = self._format_date(value)
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return u"'%s'" % value.replace(u"'", u"''")
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def _format_where_clauses(self, where_clauses, where_op=u'AND'):
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""" Format WHERE clauses """
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if isinstance(where_clauses, str):
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return where_clauses
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if isinstance(where_clauses, list):
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return (u" %s " % where_op).join(where_clauses)
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if isinstance(where_clauses, dict):
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return (u" %s " % where_op).join(map(lambda x: "%s=%s" % (x, self._quote_value(where_clauses[x])), where_clauses))
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log.error('Unsupported where clauses type %s', type(where_clauses))
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return False
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def _format_datetime(self, value):
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""" Format datetime object as string """
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assert isinstance(value, datetime.datetime)
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return value.strftime(self.datetime_format)
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def _format_date(self, value):
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""" Format date object as string """
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assert isinstance(value, (datetime.date, datetime.datetime))
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return value.strftime(self.date_format)
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def time2datetime(self, time):
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""" Convert timestamp to datetime string """
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return self._format_datetime(datetime.datetime.fromtimestamp(int(time)))
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def time2date(self, time):
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""" Convert timestamp to date string """
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return self._format_date(datetime.date.fromtimestamp(int(time)))
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def insert(self, table, values, just_try=False):
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""" Run INSERT SQL query """
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sql=u"INSERT INTO %s (%s) VALUES (%s)" % (table, u', '.join(values.keys()), u", ".join(map(lambda x: self._quote_value(values[x]), values)))
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if just_try:
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log.debug(u"Just-try mode : execute INSERT query : %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql):
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log.error(u"Fail to execute INSERT query (SQL : %s)", sql)
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return False
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return True
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def update(self, table, values, where_clauses, where_op=u'AND', just_try=False):
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""" Run UPDATE SQL query """
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where=self._format_where_clauses(where_clauses, where_op=where_op)
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if not where:
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return False
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sql=u"UPDATE %s SET %s WHERE %s" % (table, u", ".join(map(lambda x: "%s=%s" % (x, self._quote_value(values[x])), values)), where)
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if just_try:
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log.debug(u"Just-try mode : execute UPDATE query : %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql):
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log.error(u"Fail to execute UPDATE query (SQL : %s)", sql)
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return False
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return True
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def delete(self, table, where_clauses, where_op=u'AND', just_try=False):
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""" Run DELETE SQL query """
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where=self._format_where_clauses(where_clauses, where_op=where_op)
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if not where:
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return False
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sql=u"DELETE FROM %s WHERE %s" % (table, where)
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if just_try:
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log.debug(u"Just-try mode : execute DELETE query : %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql):
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log.error(u"Fail to execute DELETE query (SQL : %s)", sql)
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return False
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return True
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def select(self, table, where_clauses=None, fields=None, where_op=u'AND', order_by=None):
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""" Run SELECT SQL query """
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sql = u"SELECT "
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if fields is None:
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sql += "*"
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elif isinstance(fields, str):
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sql += fields
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else:
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sql += u", ".join(fields)
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sql += u" FROM " + table
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if where_clauses:
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where=self._format_where_clauses(where_clauses, where_op=where_op)
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if not where:
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return False
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sql += u" WHERE " + where
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if order_by:
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sql += u"ORDER %s" % order_by
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return self.doSelect(sql)
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