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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.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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('view', _('Views'), 1), |
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('alias', _('Aliases'),1), |
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('summary', _('Summary 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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where_user = "" |
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if type == None: |
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where_type = ['A','S','T','V'] |
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else: |
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where_type = [string.upper(type[0])] |
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statement = \ |
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"select tabschema||'.'||tabname||'.'||type full_name, " + \ |
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"tabschema||'.'||tabname table_name, " + \ |
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"type table_type " + \ |
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"from syscat.tables where type in ('%s') and status = 'N' %s " \ |
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% (string.join(where_type,"','"), where_user) + \ |
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"order by tabname " |
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GDebug.printMesg(5,statement) |
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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':string.lower(rs[0]), 'name':rs[1], |
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'type':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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# Find a schema object with specified name |
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def getSchemaByName(self, name, type=None): |
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where_user = "" |
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parts = string.split(string.upper(name),'.') |
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name = parts[-1] |
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if len(parts) > 1: |
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schema = " and tabschema='%s'" % parts[-2] |
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else: |
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schema = "" |
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statement = \ |
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"select tabschema||'.'||tabname||'.'||type full_name, " + \ |
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"tabschema||'.'||tabname table_name, " + \ |
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"type table_type " + \ |
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"from syscat.tables where tabname == '%s' and status = 'N' %s " \ |
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% (name, schema) + \ |
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"order by tabname " |
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GDebug.printMesg(5,statement) |
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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':string.lower(rs[0]), 'name':rs[1], |
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'type':rs[2]}, |
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getChildSchema=self.__getFieldSchema)) |
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cursor.close() |
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try: |
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return list[0] |
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except: |
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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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# TODO: This does not support user-defined datatypes... |
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# TODO: it will always report such as TEXT-like fields. |
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schema, name, type = string.split(parent.id,'.') |
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cursor = self._connection.native.cursor() |
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if type == 'a': |
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statement = "select base_tabschema, base_tabname " + \ |
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"from syscat.tables " + \ |
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"where tabschema = '%s' and tabname='%s'" % (schema, name) |
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GDebug.printMesg(5,statement) |
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cursor.execute(statement) |
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rs = cursor.fetchone() |
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schema, name = rs |
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statement = \ |
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"select tabschema||'.'||tabname||'.'||colname, " + \ |
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"colname, typename, nulls, length, scale, typeschema " + \ |
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"from syscat.columns" + \ |
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"where tabschema = '%s' and tabname = '%s' " % (schema, name) + \ |
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"order by colno" |
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GDebug.printMesg(5,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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attrs={'id': rs[0], 'name': rs[1], |
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'type':'field', 'nativetype': rs[2], |
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'required': rs[3] == 'Y'} |
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if rs[2] in ('SMALLINT','INTEGER','INT','FLOAT','DOUBLE', |
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'DECIMAL','BIGINT','REAL','DEC','NUMERIC','NUMBER', |
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'NUM'): |
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attrs['precision'] = rs[5] |
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attrs['datatype'] = 'number' |
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elif rs[2] in ('DATE','TIME','TIMESTAMP'): |
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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[5] != 0: |
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attrs['length'] = rs[4] |
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list.append(GIntrospection.Schema(attrs=attrs)) |
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cursor.close() |
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return tuple(list) |
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