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-rw-r--r--src/interfaces/python/pg.py223
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diff --git a/src/interfaces/python/pg.py b/src/interfaces/python/pg.py
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-# pgutil.py
-# Written by D'Arcy J.M. Cain
-
-# This library implements some basic database management stuff
-# It includes the pg module and builds on it
-
-from _pg import *
-import string, re, sys
-
-# utility function
-# We expect int, seq, decimal, text or date (more later)
-def _quote(d, t):
- if t in ['int', 'decimal', 'seq']:
- if d == "": return 0
- return "%s" % d
-
- if t == 'bool':
- if string.upper(d) in ['T', 'TRUE', 'Y', 'YES', 1, '1', 'ON']:
- return "'t'"
- else:
- return "'f'"
-
- if d == "": return "null"
- return "'%s'" % string.strip(re.sub('\'', '\'\'', "%s" % d))
-
-class DB:
- """This class wraps the pg connection type"""
-
- def __init__(self, *args):
- self.db = apply(connect, args)
- self.attnames = {}
- self.pkeys = {}
- self.debug = None # For debugging scripts, set to output format
- # that takes a single string arg. For example
- # in a CGI set to "%s<BR>"
-
- # Get all the primary keys at once
- for rel, att in self.db.query("""SELECT
- pg_class.relname, pg_attribute.attname
- FROM pg_class, pg_attribute, pg_index
- WHERE pg_class.oid = pg_attribute.attrelid AND
- pg_class.oid = pg_index.indrelid AND
- pg_index.indkey[0] = pg_attribute.attnum AND
- pg_index.indisprimary = 't'""").getresult():
- self.pkeys[rel] = att
-
- def pkey(self, cl):
- # will raise an exception if primary key doesn't exist
- return self.pkeys[cl]
-
- def get_attnames(self, cl):
- # May as well cache them
- if self.attnames.has_key(cl):
- return self.attnames[cl]
-
- query = """SELECT pg_attribute.attname, pg_type.typname
- FROM pg_class, pg_attribute, pg_type
- WHERE pg_class.relname = '%s' AND
- pg_attribute.attnum > 0 AND
- pg_attribute.attrelid = pg_class.oid AND
- pg_attribute.atttypid = pg_type.oid"""
-
- l = {}
- for attname, typname in self.db.query(query % cl).getresult():
- if re.match("^int", typname):
- l[attname] = 'int'
- elif re.match("^oid", typname):
- l[attname] = 'int'
- elif re.match("^text", typname):
- l[attname] = 'text'
- elif re.match("^char", typname):
- l[attname] = 'text'
- elif re.match("^name", typname):
- l[attname] = 'text'
- elif re.match("^abstime", typname):
- l[attname] = 'date'
- elif re.match("^date", typname):
- l[attname] = 'date'
- elif re.match("^bool", typname):
- l[attname] = 'bool'
- elif re.match("^float", typname):
- l[attname] = 'decimal'
- elif re.match("^money", typname):
- l[attname] = 'money'
- else:
- l[attname] = 'text'
-
- self.attnames[cl] = l
- return self.attnames[cl]
-
- # return a tuple from a database
- def get(self, cl, arg, keyname = None):
- if keyname == None: # use the primary key by default
- keyname = self.pkeys[cl]
-
- fnames = self.get_attnames(cl)
-
- if type(arg) == type({}):
- # To allow users to work with multiple tables we munge the
- # name when the key is "oid"
- if keyname == 'oid': k = arg['oid_%s' % cl]
- else: k = arg[keyname]
- else:
- k = arg
- arg = {}
-
- # We want the oid for later updates if that isn't the key
- if keyname == 'oid':
- q = "SELECT * FROM %s WHERE oid = %s" % (cl, k)
- else:
- q = "SELECT oid AS oid_%s, %s FROM %s WHERE %s = %s" % \
- (cl, string.join(fnames.keys(), ','),\
- cl, keyname, _quote(k, fnames[keyname]))
-
- if self.debug != None: print self.debug % q
- res = self.db.query(q).dictresult()
- if res == []:
- raise error, \
- "No such record in %s where %s is %s" % \
- (cl, keyname, _quote(k, fnames[keyname]))
- return None
-
- for k in res[0].keys():
- arg[k] = res[0][k]
-
- return arg
-
- # Inserts a new tuple into a table
- def insert(self, cl, a):
- fnames = self.get_attnames(cl)
- l = []
- n = []
- for f in fnames.keys():
- if a.has_key(f):
- if a[f] == "": l.append("null")
- else: l.append(_quote(a[f], fnames[f]))
- n.append(f)
-
- try:
- q = "INSERT INTO %s (%s) VALUES (%s)" % \
- (cl, string.join(n, ','), string.join(l, ','))
- if self.debug != None: print self.debug % q
- a['oid_%s' % cl] = self.db.query(q)
- except:
- raise error, "Error inserting into %s: %s" % (cl, sys.exc_value)
-
- # reload the dictionary to catch things modified by engine
- return self.get(cl, a, 'oid')
-
- # update always works on the oid which get returns
- def update(self, cl, a):
- q = "SELECT oid FROM %s WHERE oid = %s" % (cl, a['oid_%s' % cl])
- if self.debug != None: print self.debug % q
- res = self.db.query(q).getresult()
- if len(res) < 1:
- raise error, "No record in %s where oid = %s (%s)" % \
- (cl, a['oid_%s' % cl], sys.exc_value)
-
- v = []
- k = 0
- fnames = self.get_attnames(cl)
-
- for ff in fnames.keys():
- if a.has_key(ff) and a[ff] != res[0][k]:
- v.append("%s = %s" % (ff, _quote(a[ff], fnames[ff])))
-
- if v == []:
- return None
-
- try:
- q = "UPDATE %s SET %s WHERE oid = %s" % \
- (cl, string.join(v, ','), a['oid_%s' % cl])
- if self.debug != None: print self.debug % q
- self.db.query(q)
- except:
- raise error, "Can't update %s: %s" % (cl, sys.exc_value)
-
- # reload the dictionary to catch things modified by engine
- return self.get(cl, a, 'oid')
-
- # At some point we will need a way to get defaults from a table
- def clear(self, cl, a = {}):
- fnames = self.get_attnames(cl)
- for ff in fnames.keys():
- if fnames[ff] in ['int', 'decimal', 'seq', 'money']:
- a[ff] = 0
- elif fnames[ff] == 'date':
- a[ff] = 'TODAY'
- else:
- a[ff] = ""
-
- a['oid'] = 0
- return a
-
- # Like update, delete works on the oid
- # one day we will be testing that the record to be deleted
- # isn't referenced somewhere (or else PostgreSQL will)
- def delete(self, cl, a):
- try:
- q = "DELETE FROM %s WHERE oid = %s" % (cl, a['oid_%s' % cl])
- if self.debug != None: print self.debug % q
- self.db.query(q)
- except:
- return "Can't delete %s: %s" % (cl, sys.exc_value)
-
- return None
-
-
- # The rest of these methods are for convenience. Note that X.method()
- # and X.db.method() are equivalent
- def query(self, query): return self.db.query(query)
- def reset(self): self.db.reset()
- def getnotify(self): self.db.getnotify()
- def inserttable(self): self.db.inserttable()
-
- # The following depend on being activated in the underlying C code
- def putline(self): self.db.putline()
- def getline(self): self.db.getline()
- def endcopy(self): self.db.endcopy()
- def locreate(self): self.db.locreate()
- def getlo(self): self.db.getlo()
- def loimport(self): self.db.loimport()
-
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