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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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# |
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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 =[ ('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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if type!=None: |
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where=" WHERE type='%s'" % type |
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else: |
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where="" |
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statement = "SELECT type,name,tbl_name,sql FROM master "+\ |
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where+" UNION ALL "+\ |
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"SELECT type,name,tbl_name,sql FROM temp_master "+\ |
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where+" ORDER BY name;" |
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cursor = self._connection.native.cursor() |
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GDebug.printMesg(1,"** Executing: %s **" % statement) |
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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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if rs[0] in ('table','view'): |
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list.append(GIntrospection.Schema(attrs={'id':rs[1], 'name':rs[1], \ |
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'type':rs[0],}, |
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getChildSchema=self.__getFieldSchema)) |
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cursor.close() |
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print list |
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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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if type!=None: |
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where=" AND type='%s'" % type |
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else: |
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where="" |
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statement = ("SELECT type,name,tbl_name,sql FROM master "+\ |
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"WHERE name='%s'"+where+" UNION ALL "+\ |
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"SELECT type,name,tbl_name,sql FROM temp_master "+\ |
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"WHERE name='%s' "+where+" ORDER BY name;") % (name,name) |
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cursor = self._connection.native.cursor() |
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GDebug.printMesg(1,"** Executing: %s **" % statement) |
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cursor.execute(statement) |
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rs = cursor.fetchone() |
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if rs and rs[0] in ('table','view'): |
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schema = GIntrospection.Schema(attrs={'id':rs[1], 'name':rs[1], \ |
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'type':rs[0],}, |
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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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# Get fields for a table |
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def __getFieldSchema(self, parent): |
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if parent.type=='view': |
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print "Views are not supported at the moment" |
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return None |
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statement = ("SELECT type,name,tbl_name,sql FROM master "+\ |
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"WHERE type='%s' and name='%s' UNION ALL "+\ |
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"SELECT type,name,tbl_name,sql FROM temp_master "+\ |
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"WHERE type='%s' "+\ |
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"and name='%s' ORDER BY name;") % (parent.type,parent.id,\ |
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parent.type,parent.id) |
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cursor = self._connection.native.cursor() |
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GDebug.printMesg(1,"** Executing: %s **" % statement) |
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cursor.execute(statement) |
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columns = cursor.description |
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# Because sqlite don't store column definitions, but computes it |
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# every time anew from the 'create table' statement, we have to |
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# parse that statement to get the data |
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# get sql definition of table |
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rs = cursor.fetchone() |
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cursor.close() |
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if rs: |
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sql=rs[3] |
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else: |
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return None |
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# parse the sql definition |
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GDebug.printMesg(3,"** Table definition: %s **" % sql) |
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sql=sql[find(sql,'(')+1:rfind(sql,')')] |
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fields = split(sql,',') |
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list = [] |
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for field in fields: |
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fls=split(strip(field),' ',2) |
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if not fls[0] in ('Constraint','Primary'): |
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try: |
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nativetype= fls[1][:find(fls[1],'(')] |
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size=int(fls[1][find(fls[1],'(')+1:-1]) |
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except: |
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nativetype = fls[1] |
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size=None |
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attrs={'id': "%s.%s" % (parent.id, fls[0]), 'name': fls[0], |
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'type':'field', 'nativetype': nativetype, |
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'required':fls[2]=="NOT NULL"} |
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if size!=None: |
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attrs['length'] = size |
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if nativetype 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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list.append(GIntrospection.Schema(attrs=attrs)) |
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return list |
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