# Mark Huang <mlhuang@cs.princeton.edu>
# Copyright (C) 2006 The Trustees of Princeton University
#
-# $Id: PostgreSQL.py,v 1.4 2006/10/13 20:00:37 mlhuang Exp $
+# $Id$
+# $URL$
#
+import psycopg2
+import psycopg2.extensions
+psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
+# UNICODEARRAY not exported yet
+psycopg2.extensions.register_type(psycopg2._psycopg.UNICODEARRAY)
+
import pgdb
from types import StringTypes, NoneType
import traceback
import commands
+import re
from pprint import pformat
from PLC.Debug import profile, log
class PostgreSQL:
def __init__(self, api):
self.api = api
+ self.debug = False
+# self.debug = True
+ self.connection = None
- # Initialize database connection
- self.db = pgdb.connect(user = api.config.PLC_DB_USER,
- password = api.config.PLC_DB_PASSWORD,
- host = "%s:%d" % (api.config.PLC_DB_HOST, api.config.PLC_DB_PORT),
- database = api.config.PLC_DB_NAME)
- self.cursor = self.db.cursor()
+ def cursor(self):
+ if self.connection is None:
+ # (Re)initialize database connection
+ try:
+ # Try UNIX socket first
+ self.connection = psycopg2.connect(user = self.api.config.PLC_DB_USER,
+ password = self.api.config.PLC_DB_PASSWORD,
+ database = self.api.config.PLC_DB_NAME)
+ except psycopg2.OperationalError:
+ # Fall back on TCP
+ self.connection = psycopg2.connect(user = self.api.config.PLC_DB_USER,
+ password = self.api.config.PLC_DB_PASSWORD,
+ database = self.api.config.PLC_DB_NAME,
+ host = self.api.config.PLC_DB_HOST,
+ port = self.api.config.PLC_DB_PORT)
+ self.connection.set_client_encoding("UNICODE")
(self.rowcount, self.description, self.lastrowid) = \
(None, None, None)
- def quote(self, params):
+ return self.connection.cursor()
+
+ def close(self):
+ if self.connection is not None:
+ self.connection.close()
+ self.connection = None
+
+ # join insists on getting strings
+ @classmethod
+ def quote_string(self, value):
+ return str(PostgreSQL.quote(value))
+
+ @classmethod
+ def quote(self, value):
"""
- Returns quoted version(s) of the specified parameter(s).
+ Returns quoted version of the specified value.
"""
- # pgdb._quote functions are good enough for general SQL quoting
- if hasattr(params, 'has_key'):
- params = pgdb._quoteitem(params)
- elif isinstance(params, list) or isinstance(params, tuple):
- params = map(pgdb._quote, params)
+ # The pgdb._quote function is good enough for general SQL
+ # quoting, except for array types.
+ if isinstance(value, (list, tuple, set)):
+ return "ARRAY[%s]" % ", ".join(map (PostgreSQL.quote_string, value))
else:
- params = pgdb._quote(params)
-
- return params
-
- quote = classmethod(quote)
+ return pgdb._quote(value)
+ @classmethod
def param(self, name, value):
# None is converted to the unquoted string NULL
if isinstance(value, NoneType):
return '%(' + name + ')' + conversion
- param = classmethod(param)
-
def begin_work(self):
# Implicit in pgdb.connect()
pass
def commit(self):
- self.db.commit()
+ self.connection.commit()
def rollback(self):
- self.db.rollback()
+ self.connection.rollback()
def do(self, query, params = None):
- self.execute(query, params)
+ cursor = self.execute(query, params)
+ cursor.close()
return self.rowcount
+ def next_id(self, table_name, primary_key):
+ sequence = "%(table_name)s_%(primary_key)s_seq" % locals()
+ sql = "SELECT nextval('%(sequence)s')" % locals()
+ rows = self.selectall(sql, hashref = False)
+ if rows:
+ return rows[0][0]
+
+ return None
+
def last_insert_id(self, table_name, primary_key):
if isinstance(self.lastrowid, int):
sql = "SELECT %s FROM %s WHERE oid = %d" % \
return None
+ # modified for psycopg2-2.0.7
+ # executemany is undefined for SELECT's
+ # see http://www.python.org/dev/peps/pep-0249/
+ # accepts either None, a single dict, a tuple of single dict - in which case it execute's
+ # or a tuple of several dicts, in which case it executemany's
def execute(self, query, params = None):
- self.execute_array(query, (params,))
- def execute_array(self, query, param_seq):
- cursor = self.cursor
+ cursor = self.cursor()
try:
- cursor.executemany(query, param_seq)
+
+ # psycopg2 requires %()s format for all parameters,
+ # regardless of type.
+ # this needs to be done carefully though as with pattern-based filters
+ # we might have percents embedded in the query
+ # so e.g. GetPersons({'email':'*fake*'}) was resulting in .. LIKE '%sake%'
+ if psycopg2:
+ query = re.sub(r'(%\([^)]*\)|%)[df]', r'\1s', query)
+ # rewrite wildcards set by Filter.py as '***' into '%'
+ query = query.replace ('***','%')
+
+ if not params:
+ if self.debug:
+ print >> log,'execute0',query
+ cursor.execute(query)
+ elif isinstance(params,dict):
+ if self.debug:
+ print >> log,'execute-dict: params',params,'query',query%params
+ cursor.execute(query,params)
+ elif isinstance(params,tuple) and len(params)==1:
+ if self.debug:
+ print >> log,'execute-tuple',query%params[0]
+ cursor.execute(query,params[0])
+ else:
+ param_seq=(params,)
+ if self.debug:
+ for params in param_seq:
+ print >> log,'executemany',query%params
+ cursor.executemany(query, param_seq)
(self.rowcount, self.description, self.lastrowid) = \
(cursor.rowcount, cursor.description, cursor.lastrowid)
- except pgdb.DatabaseError, e:
+ except Exception, e:
try:
self.rollback()
except:
print >> log, "Query:"
print >> log, query
print >> log, "Params:"
- print >> log, pformat(param_seq[0])
+ print >> log, pformat(params)
raise PLCDBError("Please contact " + \
self.api.config.PLC_NAME + " Support " + \
"<" + self.api.config.PLC_MAIL_SUPPORT_ADDRESS + ">" + \
" and reference " + uuid)
+ return cursor
+
def selectall(self, query, params = None, hashref = True, key_field = None):
"""
Return each row as a dictionary keyed on field name (like DBI
selectall_hashref()).
If params is specified, the specified parameters will be bound
- to the query (see PLC.DB.parameterize() and
- pgdb.cursor.execute()).
+ to the query.
"""
- self.execute(query, params)
- rows = self.cursor.fetchall()
-
- if hashref:
+ cursor = self.execute(query, params)
+ rows = cursor.fetchall()
+ cursor.close()
+ self.commit()
+ if hashref or key_field is not None:
# Return each row as a dictionary keyed on field name
# (like DBI selectrow_hashref()).
labels = [column[0] for column in self.description]
Return the names of the fields of the specified table.
"""
+ if hasattr(self, 'fields_cache'):
+ if self.fields_cache.has_key((table, notnull, hasdef)):
+ return self.fields_cache[(table, notnull, hasdef)]
+ else:
+ self.fields_cache = {}
+
sql = "SELECT attname FROM pg_attribute, pg_class" \
" WHERE pg_class.oid = attrelid" \
" AND attnum > 0 AND relname = %(table)s"
rows = self.selectall(sql, locals(), hashref = False)
- return [row[0] for row in rows]
+ self.fields_cache[(table, notnull, hasdef)] = [row[0] for row in rows]
+
+ return self.fields_cache[(table, notnull, hasdef)]
git://git.onelab.eu / plcapi.git / blobdiff