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# This file is part of GNU Enterprise. |
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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.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 =[ ('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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# |
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# Schema (metadata) functions |
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# |
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# Return a list of Schema objects |
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def getSchemaList(self, type=None): |
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# TODO: This excludes any system tables and views. Should it? |
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statement = "SHOW TABLES" |
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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[0], 'name':rs[0], |
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'type':'table', |
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'primarykey': self.__getPrimaryKey(rs[0])}, |
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getChildSchema=self.__getFieldSchema)) |
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cursor.close() |
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return list |
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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 = "DESCRIBE %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':name, 'name':name, |
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'type':'table', |
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'primarykey': self.__getPrimaryKey(name,cursor)}, |
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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, id, cursor=None): |
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statement = "DESCRIBE %s" % id |
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if not cursor: |
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cursor = self._connection.native.cursor() |
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close_cursor = 1 |
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else: |
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close_cursor = 0 |
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cursor.execute(statement) |
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lst = [] |
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for rs in cursor.fetchall(): |
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if rs[3] == 'PRI': |
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lst.append(rs[0]) |
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if close_cursor: |
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cursor.close() |
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return tuple(lst) |
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# Get fields for a table |
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def __getFieldSchema(self, parent): |
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statement = "DESCRIBE %s" % parent.id |
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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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nativetype = string.split(string.replace(rs[1],')',''),'(') |
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attrs={'id': "%s.%s" % (parent.id, rs[0]), 'name': rs[0], |
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'type':'field', 'nativetype': nativetype[0], |
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'required': rs[2] != 'YES'} |
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if nativetype[0] in ('int','integer','bigint','mediumint', |
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'smallint','tinyint','float','real', |
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'double','decimal'): |
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attrs['datatype']='number' |
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elif nativetype[0] in ('date','time','timestamp','datetime'): |
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attrs['datatype']='date' |
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else: |
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attrs['datatype']='text' |
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try: |
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if len(nativetype) == 2: |
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try: |
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ln, prec = nativetype[1].split(',') |
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except: |
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ln = nativetype[1] |
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prec = None |
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attrs['length'] = int(ln.split()[0]) |
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if prec != None: |
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attrs['precision'] = int(prec) |
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except ValueError: |
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GDebug.printMesg(1,'WARNING: mysql native type error: %s' % nativetype) |
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if rs[4] not in ('NULL', '0000-00-00 00:00:00','', None): |
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attrs['defaulttype'] = 'constant' |
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attrs['defaultval'] = rs[4] |
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if rs[5] == 'auto_increment': |
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attrs['defaulttype'] = 'serial' |
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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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