/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/transientdb.py
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revision 1375 by bh, Tue Jul 8 10:53:05 2003 UTC revision 1662 by bh, Wed Aug 27 13:51:01 2003 UTC
# Line 18  __version__ = "$Revision$" Line 18  __version__ = "$Revision$"
18  # $Source$  # $Source$
19  # $Id$  # $Id$
20    
 import os  
 import weakref  
21  from sqlite import connect  from sqlite import connect
22    
23  from base import TitledObject  from base import TitledObject
# Line 162  class TransientTableBase(table.OldTableI Line 160  class TransientTableBase(table.OldTableI
160          """          """
161          return self.column_map.has_key(col)          return self.column_map.has_key(col)
162    
163      def ReadRowAsDict(self, index):      def RowIdToOrdinal(self, gid):
164            """Return the row ordinal given its id
165    
166            At the moment the transient tables are only used for tables that
167            don't distinguish between row number and row id, so the value is
168            returned unchanged.
169            """
170            return gid
171    
172        def RowOrdinalToId(self, num):
173            """Return the rowid for given its ordinal
174    
175            At the moment the transient tables are only used for tables that
176            don't distinguish between row number and row id, so the value is
177            returned unchanged.
178            """
179            return num
180    
181        def ReadRowAsDict(self, index, row_is_ordinal = 0):
182            """Return the entire row as a dictionary with column names as keys
183    
184            The row_is_ordinal is ignored because at the moment the
185            transient tables are only used for DBF files where it doesn't
186            matter.
187            """
188          # Implementation Strategy: Executing a completely new select          # Implementation Strategy: Executing a completely new select
189          # statement every time this method is called is too slow. The          # statement every time this method is called is too slow. The
190          # most important usage is to read the records more or less          # most important usage is to read the records more or less
# Line 210  class TransientTableBase(table.OldTableI Line 232  class TransientTableBase(table.OldTableI
232          self.read_record_last_row = index          self.read_record_last_row = index
233          return dict(zip(self.orig_names, result))          return dict(zip(self.orig_names, result))
234    
235      def ReadValue(self, row, col):      def ReadValue(self, row, col, row_is_ordinal = 0):
236          """Return the value of the specified row and column          """Return the value of the specified row and column
237    
238          The col parameter may be the index of the column or its name.          The col parameter may be the index of the column or its name.
239    
240            The row_is_ordinal is ignored because at the moment the
241            transient tables are only used for DBF files where it doesn't
242            matter.
243          """          """
244          # Depending on the actual access patterns of the table data, it          # Depending on the actual access patterns of the table data, it
245          # might be a bit faster in some circumstances to not implement          # might be a bit faster in some circumstances to not implement
# Line 245  class TransientTableBase(table.OldTableI Line 271  class TransientTableBase(table.OldTableI
271      def Width(self, col):      def Width(self, col):
272          """Return the maximum width of values in the column          """Return the maximum width of values in the column
273    
274          The return value is the the maximum length of string representation          The return value is the the maximum length of string
275          of the values in the column (represented by index or name)."""          representation of the values in the column (represented by index
276            or name).
277            """
278          max = 0          max = 0
279            
280          type  = self.column_map[col].type          type  = self.column_map[col].type
281          iname = self.column_map[col].internal_name          iname = self.column_map[col].internal_name
282          cursor = self.db.cursor()          cursor = self.db.cursor()
# Line 257  class TransientTableBase(table.OldTableI Line 285  class TransientTableBase(table.OldTableI
285          if not values:          if not values:
286              return None              return None
287    
288          if type == sql_type_map[table.FIELDTYPE_DOUBLE]:          if type == table.FIELDTYPE_DOUBLE:
289              format = "%.12f"              format = "%.12f"
290          elif type == sql_type_map[table.FIELDTYPE_INT]:          elif type == table.FIELDTYPE_INT:
291              format = "%d"              format = "%d"
292          else:          else:
293              format = "%s"              format = "%s"
# Line 502  class AutoTransientTable(TitledObject, t Line 530  class AutoTransientTable(TitledObject, t
530      def NumColumns(self):      def NumColumns(self):
531          return self.table.NumColumns()          return self.table.NumColumns()
532    
533      def ReadRowAsDict(self, record):      def RowIdToOrdinal(self, gid):
534            """Return the row ordinal given its id"""
535            if self.t_table is not None:
536                return self.t_table.RowIdToOrdinal(gid)
537            else:
538                return self.table.RowIdToOrdinal(gid)
539    
540        def RowOrdinalToId(self, num):
541            """Return the rowid for given its ordinal"""
542            if self.t_table is not None:
543                return self.t_table.RowOrdinalToId(num)
544            else:
545                return self.table.RowOrdinalToId(num)
546    
547        def ReadRowAsDict(self, record, row_is_ordinal = 0):
548          """Return the record no. record as a dict mapping field names to values          """Return the record no. record as a dict mapping field names to values
549          """          """
550          if self.t_table is not None:          if self.t_table is not None:
551              return self.t_table.ReadRowAsDict(record)              return self.t_table.ReadRowAsDict(record,
552                                                  row_is_ordinal = row_is_ordinal)
553          else:          else:
554              return self.table.ReadRowAsDict(record)              return self.table.ReadRowAsDict(record,
555                                                row_is_ordinal = row_is_ordinal)
556    
557      def ReadValue(self, row, col):      def ReadValue(self, row, col, row_is_ordinal = 0):
558          """Return the value of the specified row and column          """Return the value of the specified row and column
559    
560          The col parameter may be the index of the column or its name.          The col parameter may be the index of the column or its name.
561          """          """
562          if self.t_table is not None:          if self.t_table is not None:
563              return self.t_table.ReadValue(row, col)              return self.t_table.ReadValue(row, col,
564                                              row_is_ordinal = row_is_ordinal)
565          else:          else:
566              return self.table.ReadValue(row, col)              return self.table.ReadValue(row, col,
567                                            row_is_ordinal = row_is_ordinal)
568    
569      def copy_to_transient(self):      def copy_to_transient(self):
570          """Internal: Create a transient table and copy the data into it"""          """Internal: Create a transient table and copy the data into it"""
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