--- /dev/null
+#
+# PostgreSQL database interface. Sort of like DBI(3) (Database
+# independent interface for Perl).
+#
+# Mark Huang <mlhuang@cs.princeton.edu>
+# Copyright (C) 2006 The Trustees of Princeton University
+#
+# $Id$
+#
+
+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
+from PLC.Faults import *
+
+if not psycopg2:
+ is8bit = re.compile("[\x80-\xff]").search
+
+ def unicast(typecast):
+ """
+ pgdb returns raw UTF-8 strings. This function casts strings that
+ appear to contain non-ASCII characters to unicode objects.
+ """
+
+ def wrapper(*args, **kwds):
+ value = typecast(*args, **kwds)
+
+ # pgdb always encodes unicode objects as UTF-8 regardless of
+ # the DB encoding (and gives you no option for overriding
+ # the encoding), so always decode 8-bit objects as UTF-8.
+ if isinstance(value, str) and is8bit(value):
+ value = unicode(value, "utf-8")
+
+ return value
+
+ return wrapper
+
+ pgdb.pgdbTypeCache.typecast = unicast(pgdb.pgdbTypeCache.typecast)
+
+class PostgreSQL:
+ def __init__(self, api):
+ self.api = api
+ self.debug = False
+ self.connection = None
+
+ def cursor(self):
+ if self.connection is None:
+ # (Re)initialize database connection
+ if psycopg2:
+ 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")
+ else:
+ self.connection = pgdb.connect(user = self.api.config.PLC_DB_USER,
+ password = self.api.config.PLC_DB_PASSWORD,
+ host = "%s:%d" % (api.config.PLC_DB_HOST, api.config.PLC_DB_PORT),
+ database = self.api.config.PLC_DB_NAME)
+
+ (self.rowcount, self.description, self.lastrowid) = \
+ (None, None, None)
+
+ return self.connection.cursor()
+
+ def close(self):
+ if self.connection is not None:
+ self.connection.close()
+ self.connection = None
+
+ def quote(self, value):
+ """
+ Returns quoted version of the specified value.
+ """
+
+ # 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, self.quote, value)
+ else:
+ return pgdb._quote(value)
+
+ quote = classmethod(quote)
+
+ def param(self, name, value):
+ # None is converted to the unquoted string NULL
+ if isinstance(value, NoneType):
+ conversion = "s"
+ # True and False are also converted to unquoted strings
+ elif isinstance(value, bool):
+ conversion = "s"
+ elif isinstance(value, float):
+ conversion = "f"
+ elif not isinstance(value, StringTypes):
+ conversion = "d"
+ else:
+ conversion = "s"
+
+ return '%(' + name + ')' + conversion
+
+ param = classmethod(param)
+
+ def begin_work(self):
+ # Implicit in pgdb.connect()
+ pass
+
+ def commit(self):
+ self.connection.commit()
+
+ def rollback(self):
+ self.connection.rollback()
+
+ def do(self, query, params = None):
+ cursor = self.execute(query, params)
+ cursor.close()
+ return self.rowcount
+
+ def last_insert_id(self, table_name, primary_key):
+ if isinstance(self.lastrowid, int):
+ sql = "SELECT %s FROM %s WHERE oid = %d" % \
+ (primary_key, table_name, self.lastrowid)
+ rows = self.selectall(sql, hashref = False)
+ if rows:
+ return rows[0][0]
+
+ return None
+
+ def execute(self, query, params = None):
+ return self.execute_array(query, (params,))
+
+ def execute_array(self, query, param_seq):
+ cursor = self.cursor()
+ try:
+ if self.debug:
+ for params in param_seq:
+ if params:
+ print >> log, query % params
+ else:
+ print >> log, query
+
+ # psycopg2 requires %()s format for all parameters,
+ # regardless of type.
+ if psycopg2:
+ query = re.sub(r'(%\([^)]*\)|%)[df]', r'\1s', query)
+
+ cursor.executemany(query, param_seq)
+ (self.rowcount, self.description, self.lastrowid) = \
+ (cursor.rowcount, cursor.description, cursor.lastrowid)
+ except Exception, e:
+ try:
+ self.rollback()
+ except:
+ pass
+ uuid = commands.getoutput("uuidgen")
+ print >> log, "Database error %s:" % uuid
+ print >> log, e
+ print >> log, "Query:"
+ print >> log, query
+ print >> log, "Params:"
+ print >> log, pformat(param_seq[0])
+ 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
+ selectrow_hashref()). If key_field is specified, return rows
+ as a dictionary keyed on the specified field (like DBI
+ selectall_hashref()).
+
+ If params is specified, the specified parameters will be bound
+ to the query.
+ """
+
+ cursor = self.execute(query, params)
+ rows = cursor.fetchall()
+ cursor.close()
+
+ 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]
+ rows = [dict(zip(labels, row)) for row in rows]
+
+ if key_field is not None and key_field in labels:
+ # Return rows as a dictionary keyed on the specified field
+ # (like DBI selectall_hashref()).
+ return dict([(row[key_field], row) for row in rows])
+ else:
+ return rows
+
+ def fields(self, table, notnull = None, hasdef = None):
+ """
+ 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"
+
+ if notnull is not None:
+ sql += " AND attnotnull is %(notnull)s"
+
+ if hasdef is not None:
+ sql += " AND atthasdef is %(hasdef)s"
+
+ rows = self.selectall(sql, locals(), hashref = False)
+
+ 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