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# ZPsycopgDA/db.py - query execution
#
# Copyright (C) 2004 Federico Di Gregorio <fog@initd.org>
#
# 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 2, or (at your option) any later
# version.
#
# Or, at your option this program (ZPsycopgDA) can be distributed under the
# Zope Public License (ZPL) Version 1.0, as published on the Zope web site,
# http://www.zope.org/Resources/ZPL.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
# or FITNESS FOR A PARTICULAR PURPOSE.
#
# See the LICENSE file for details.
from Shared.DC.ZRDB.TM import TM
from Shared.DC.ZRDB import dbi_db
from ZODB.POSException import ConflictError
import time
import site
import pool
import psycopg
from psycopg.extensions import INTEGER, LONGINTEGER, FLOAT, BOOLEAN
from psycopg import NUMBER, STRING, ROWID, DATETIME
# the DB object, managing all the real query work
class DB(TM, dbi_db.DB):
_p_oid = _p_changed = _registered = None
def __init__(self, dsn, tilevel, enc='utf-8'):
self.dsn = dsn
self.tilevel = tilevel
self.encoding = enc
self.failures = 0
self.calls = 0
def getconn(self, create=True):
conn = pool.getconn(self.dsn)
conn.set_isolation_level(int(self.tilevel))
return conn
def putconn(self, close=False):
try:
conn = pool.getconn(self.dsn, False)
except AttributeError:
pass
pool.putconn(self.dsn, conn, close)
def getcursor(self):
conn = self.getconn()
return conn.cursor()
def _finish(self, *ignored):
try:
conn = self.getconn(False)
conn.commit()
self.putconn()
except AttributeError:
pass
def _abort(self, *ignored):
try:
conn = self.getconn(False)
conn.rollback()
self.putconn()
except AttributeError:
pass
def open(self):
# this will create a new pool for our DSN if not already existing,
# then get and immediately release a connection
self.getconn()
self.putconn()
def close(self):
# FIXME: if this connection is closed we flush all the pool associated
# with the current DSN; does this makes sense?
pool.flushpool(self.dsn)
def sortKey(self):
return 1
## tables and rows ##
def tables(self, rdb=0, _care=('TABLE', 'VIEW')):
self._register()
c = self.getcursor()
c.execute(
"SELECT t.tablename AS NAME, 'TABLE' AS TYPE "
" FROM pg_tables t WHERE tableowner <> 'postgres' "
"UNION SELECT v.viewname AS NAME, 'VIEW' AS TYPE "
" FROM pg_views v WHERE viewowner <> 'postgres' "
"UNION SELECT t.tablename AS NAME, 'SYSTEM_TABLE\' AS TYPE "
" FROM pg_tables t WHERE tableowner = 'postgres' "
"UNION SELECT v.viewname AS NAME, 'SYSTEM_TABLE' AS TYPE "
"FROM pg_views v WHERE viewowner = 'postgres'")
res = []
for name, typ in c.fetchall():
if typ in _care:
res.append({'TABLE_NAME': name, 'TABLE_TYPE': typ})
self.putconn()
return res
def columns(self, table_name):
self._register()
c = self.getcursor()
try:
r = c.execute('SELECT * FROM "%s" WHERE 1=0' % table_name)
except:
return ()
res = []
for name, type, width, ds, p, scale, null_ok in c.description:
if type == NUMBER:
if type == INTEGER:
type = INTEGER
elif type == FLOAT:
type = FLOAT
else: type = NUMBER
elif type == BOOLEAN:
type = BOOLEAN
elif type == ROWID:
type = ROWID
elif type == DATETIME:
type = DATETIME
else:
type = STRING
res.append({'Name': name,
'Type': type.name,
'Precision': 0,
'Scale': 0,
'Nullable': 0})
self.putconn()
return res
## query execution ##
def query(self, query_string, max_rows=None, query_data=None):
self._register()
self.calls = self.calls+1
desc = ()
res = []
nselects = 0
c = self.getcursor()
try:
for qs in [x for x in query_string.split('\0') if x]:
if type(qs) == unicode:
if self.encoding:
qs = qs.encode(self.encoding)
try:
if (query_data):
c.execute(qs, query_data)
else:
c.execute(qs)
except (psycopg.ProgrammingError, psycopg.IntegrityError), e:
if e.args[0].find("concurrent update") > -1:
raise ConflictError
raise e
if c.description is not None:
nselects += 1
if c.description != desc and nselects > 1:
raise psycopg.ProgrammingError(
'multiple selects in single query not allowed')
if max_rows:
res = c.fetchmany(max_rows)
else:
res = c.fetchall()
desc = c.description
self.failures = 0
except StandardError, err:
self._abort()
raise err
items = []
for name, typ, width, ds, p, scale, null_ok in desc:
if typ == NUMBER:
if typ == INTEGER or typ == LONGINTEGER: typs = 'i'
else: typs = 'n'
elif typ == BOOLEAN:
typs = 'n'
elif typ == ROWID:
typs = 'i'
elif typ == DATETIME:
typs = 'd'
else:
typs = 's'
items.append({
'name': name,
'type': typs,
'width': width,
'null': null_ok,
})
return items, res
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