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##############################################################################
#
# Zope Public License (ZPL) Version 0.9.7
# ---------------------------------------
#
# Copyright (c) Digital Creations. All rights reserved.
#
# This license has been certified as Open Source(tm).
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions in source code must retain the above copyright
# notice, this list of conditions, and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions, and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. Digital Creations requests that attribution be given to Zope
# in any manner possible. Zope includes a "Powered by Zope"
# button that is installed by default. While it is not a license
# violation to remove this button, it is requested that the
# attribution remain. A significant investment has been put
# into Zope, and this effort will continue if the Zope community
# continues to grow. This is one way to assure that growth.
#
# 4. All advertising materials and documentation mentioning
# features derived from or use of this software must display
# the following acknowledgement:
#
# "This product includes software developed by Digital Creations
# for use in the Z Object Publishing Environment
# (http://www.zope.org/)."
#
# In the event that the product being advertised includes an
# intact Zope distribution (with copyright and license included)
# then this clause is waived.
#
# 5. Names associated with Zope or Digital Creations must not be used to
# endorse or promote products derived from this software without
# prior written permission from Digital Creations.
#
# 6. Modified redistributions of any form whatsoever must retain
# the following acknowledgment:
#
# "This product includes software developed by Digital Creations
# for use in the Z Object Publishing Environment
# (http://www.zope.org/)."
#
# Intact (re-)distributions of any official Zope release do not
# require an external acknowledgement.
#
# 7. Modifications are encouraged but must be packaged separately as
# patches to official Zope releases. Distributions that do not
# clearly separate the patches from the original work must be clearly
# labeled as unofficial distributions. Modifications which do not
# carry the name Zope may be packaged in any form, as long as they
# conform to all of the clauses above.
#
#
# Disclaimer
#
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL CREATIONS OR ITS
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
# This software consists of contributions made by Digital Creations and
# many individuals on behalf of Digital Creations. Specific
# attributions are listed in the accompanying credits file.
#
##############################################################################
"""Db connection implementation"""
__version__='$Revision: 1.9 $'[11:-2]
import _pg, regex, sys, types
import Shared.DC.ZRDB.THUNK
from string import strip, split, find, join
from time import gmtime, strftime
failures=calls = 0
nonselect_desc=[
('Query', 'meta', "string", 62, ''),
('Status', 'meta', "string", 12, ''),
('Calls', 'meta', "string", 12, ''),
]
class DB(Shared.DC.ZRDB.THUNK.THUNKED_TM):
defs={
"long": "i", "float": "n", "string": "t", "int": "i",
}
Database_Error=_pg.error
def _begin(self):
self.db.query('begin transaction')
def _finish(self):
self.db.query('commit transaction')
def _abort(self):
self.db.query('rollback transaction')
def __init__(self,connection):
self.connection=connection
info=split(connection)
if info and len(info) < 6:
while len(info) < 5: info.append('')
[user, pw, opt, tty]=info[1:]
dbhost=split(info[0],'@')
if dbhost and len(dbhost) < 3:
if len(dbhost) == 1: db, host, port = dbhost[0], None, -1
else:
db = dbhost[0]
dbhost = split(dbhost[1], ':')
if dbhost and len(dbhost) < 3:
if len(dbhost) == 1: host, port = dbhost[0], 5432
else:
[host, port] = dbhost
port = int(port)
c=_pg.connect(db, host, port, opt, tty, user, pw)
self.db=c
return
raise self.Database_Error, (
'Invalid connection string, <code>%s</code>.\n'
'The connection should consist of a database name,\n'
'user name and optional password, options and ttyname\n'
'separated by spaces.\n'
'The database name may include a host specification\n'
'by following the database name with an @ symbol and a\n'
'host name with optional : symbol and port number.\n'
'A sample connection string is:\n'
'<pre>\n'
'sample@cooldata.com:5432 public\n'
'</pre>\n'
'If the password, options and ttyname are ommitted,\n'
'empty strings will be used.'
)
def close(self):
self.db.close()
self.db=None
def query(self,query_string,
max_rows=9999999,
select_m=regex.compile('[\0- ]*select[\0- ]+',
regex.casefold).match,
):
db=self.db
try:
queries=filter(None, map(strip,split(query_string, '\0')))
if not queries: raise 'Query Error', 'empty query'
result=()
desc=None
for qs in queries:
self._register()
c=db.query(qs)
try:
desc=c.listfields()
r=c.getresult()
except: r=None
if not r: continue
if result:
raise 'Query Error', (
'select in multiple sql-statement query'
)
result=r
except self.Database_Error, mess:
db.query('abort transaction')
raise sys.exc_type, sys.exc_value, sys.exc_traceback
if desc is None: return (), ()
items=[]
func=items.append
if not result:
for d in desc:
item={'name': d,
'type': 'string',
'width': len(d),
}
func(item)
return items, result
defs=self.defs
i=0
for d in desc:
item={'name': d,
'type': defs[self.findType(result[0][i])],
'width': len(d),
}
func(item)
i=i+1
return items, result
def findType(self, field):
"""Find the type of a field"""
self.field=field
if type(field)==types.StringType:
return 'string'
elif type(field)==types.IntType:
return 'int'
elif type(field)==types.LongType:
return 'long'
elif type(field)==types.FloatType:
return 'float'
else:
return 'error'
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