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# This file is part of GNU Enterprise. |
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# |
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# GNU Enterprise is free software; you can redistribute it |
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# and/or modify it under the terms of the GNU General Public |
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# License as published by the Free Software Foundation; either |
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# version 2, or(at your option) any later version. |
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# |
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# GNU Enterprise is distributed in the hope that it will be |
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# useful, but WITHOUT ANY WARRANTY; without even the implied |
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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# PURPOSE. See the GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public |
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# License along with program; see the file COPYING. If not, |
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# write to the Free Software Foundation, Inc., 59 Temple Place |
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# - Suite 330, Boston, MA 02111-1307, USA. |
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# |
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# Copyright 2000-2003 Free Software Foundation |
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# |
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# FILE: |
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# Introspection.py |
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# DESCRIPTION: |
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# NOTES: |
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__all__ = ['Introspection'] |
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import string |
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from string import lower, join, split |
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import sys |
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from gnue.common.apps import GDebug, GConfig |
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from gnue.common.datasources import GIntrospection |
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class Introspection(GIntrospection.Introspection): |
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# list of the types of Schema objects this driver provides |
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types =[ ('view',_('Views'),1), |
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('table',_('Tables'),1) ] |
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# |
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# TODO: This is a quick hack to get this class |
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# TODO: into the new-style schema format. |
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# TODO: getSchema* should be merged into find() |
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# |
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def find(self, name=None, type=None): |
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if name is None: |
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return self.getSchemaList(type) |
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else: |
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rs = self.getSchemaByName(name, type) |
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if rs: |
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return [rs] |
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else: |
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return None |
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# TODO: Merge into find() |
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# Return a list of Schema objects |
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def getSchemaList(self, type=None): |
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includeTables = (type in ('table','sources', None)) |
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includeViews = (type in ('view','sources', None)) |
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inClause = [] |
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if includeTables: |
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inClause.append ("'r'") |
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if includeViews: |
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inClause.append ("'v'") |
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# TODO: This excludes any system tables and views. Should it? |
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statement = "select relname, relkind, oid from pg_class " + \ |
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"where relkind in (%s) " % (join(inClause,',')) + \ |
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"and relname not like 'pg_%' " + \ |
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"order by relname" |
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cursor = self._connection.native.cursor() |
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cursor.execute(statement) |
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list = [] |
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for rs in cursor.fetchall(): |
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list.append(GIntrospection.Schema(attrs={'id':rs[2], 'name':rs[0], |
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'type':rs[1] == 'v' and 'view' or 'table', |
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'primarykey': self.__getPrimaryKey(cursor, rs[2])}, |
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getChildSchema=self.__getFieldSchema)) |
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cursor.close() |
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return list |
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# TODO: Merge into find() |
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# Find a schema object with specified name |
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def getSchemaByName(self, name, type=None): |
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statement = "select relname, relkind, oid from pg_class " + \ |
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"where relname = '%s'" % (name) |
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cursor = self._connection.native.cursor() |
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cursor.execute(statement) |
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rs = cursor.fetchone() |
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if rs: |
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schema = GIntrospection.Schema(attrs={'id':rs[2], 'name':rs[0], |
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'type':rs[1] == 'v' and 'view' or 'table', |
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'primarykey': self.__getPrimaryKey(cursor, rs[2]) }, |
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getChildSchema=self.__getFieldSchema) |
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else: |
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schema = None |
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cursor.close() |
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return schema |
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def __getPrimaryKey(self, cursor, oid): |
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cursor = self._connection.native.cursor() |
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cursor.execute("select indkey from pg_index where indrelid=%s" % oid) |
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rs = cursor.fetchone() |
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statement = "select attname from pg_attribute " \ |
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"where attrelid = %s and attnum = %%s" % oid |
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if rs: |
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pks = [] |
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for indpos in string.split(rs[0]): |
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cursor.execute(statement % int(indpos)) |
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pks.append(cursor.fetchone()[0]) |
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cursor.close() |
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return tuple(pks) |
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else: |
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cursor.close() |
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return None |
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# Get fields for a table |
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def __getFieldSchema(self, parent): |
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statement = "select attname, pg_type.oid, typname, " + \ |
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" attnotnull, atthasdef, atttypmod, attnum, attlen " + \ |
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"from pg_attribute, pg_type " + \ |
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"where attrelid = %s and " % (parent.id) + \ |
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"pg_type.oid = atttypid and attnum >= 0" + \ |
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"order by attnum" |
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cursor = self._connection.native.cursor() |
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cursor.execute(statement) |
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list = [] |
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for rs in cursor.fetchall(): |
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attrs={'id': rs[1], 'name': rs[0], |
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'type':'field', 'nativetype': rs[2], |
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'required': rs[3] and not rs[4]} |
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if rs[2] in ('numeric','float4','float8','money','bool','int8','int2','int4'): |
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attrs['datatype']='number' |
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elif rs[2] in ('date','time','timestamp','abstime','reltime'): |
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attrs['datatype']='date' |
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else: |
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attrs['datatype']='text' |
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if rs[7] > 0: |
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attrs['length'] = rs[7] |
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elif rs[5] != -1: #text field |
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attrs['length'] = rs[5] - 4 |
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# Find any default values |
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if rs[4]: |
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cursor.execute("select adsrc " + \ |
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"from pg_attrdef " + \ |
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"where adrelid = %s and adnum = %s" % (parent.id, rs[6])) |
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defrs = cursor.fetchone() |
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if defrs: |
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dflt = defrs[0] |
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if dflt[:8] == 'nextval(': |
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attrs['defaulttype'] = 'sequence' |
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attrs['defaultval'] = split(dflt,"'")[1] |
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elif dflt == 'now()': |
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attrs['defaulttype'] = 'system' |
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attrs['defaultval'] = 'timestamp' |
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else: |
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attrs['defaulttype'] = 'constant' |
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attrs['defaultval'] = dflt |
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list.append(GIntrospection.Schema(attrs=attrs)) |
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cursor.close() |
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return list |
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