/[thuban]/branches/WIP-pyshapelib-bramz/test/test_transientdb.py
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revision 984 by bh, Thu May 22 16:37:48 2003 UTC revision 1364 by bh, Thu Jul 3 13:09:43 2003 UTC
# Line 50  class TestTransientTable(unittest.TestCa Line 50  class TestTransientTable(unittest.TestCa
50          self.assertEquals(table.NumRows(), 156)          self.assertEquals(table.NumRows(), 156)
51          self.assertEquals(table.NumColumns(), 8)          self.assertEquals(table.NumColumns(), 8)
52    
53          # Check one each of the possible field types. The width and          # Check one each of the possible field types.
         # decimal precision is always 0.  
54          columns = table.Columns()          columns = table.Columns()
55          self.assertEquals(columns[0].name, 'AREA')          self.assertEquals(columns[0].name, 'AREA')
56          self.assertEquals(columns[0].type, FIELDTYPE_DOUBLE)          self.assertEquals(columns[0].type, FIELDTYPE_DOUBLE)
# Line 101  class TestTransientTable(unittest.TestCa Line 100  class TestTransientTable(unittest.TestCa
100          # The transient_table method should return the table itself          # The transient_table method should return the table itself
101          self.assert_(table is table.transient_table())          self.assert_(table is table.transient_table())
102    
103            # The title is simply copied over from the original table
104            self.assertEquals(table.Title(), orig_table.Title())
105    
106          # The TransientTable class itself doesn't implement the          # The TransientTable class itself doesn't implement the
107          # Dependencies method, so we don't test it.          # Dependencies method, so we don't test it.
108    
# Line 150  class TestTransientTable(unittest.TestCa Line 152  class TestTransientTable(unittest.TestCa
152          table = AutoTransientTable(self.transientdb, orig_table)          table = AutoTransientTable(self.transientdb, orig_table)
153          self.assertEquals(table.Dependencies(), (orig_table,))          self.assertEquals(table.Dependencies(), (orig_table,))
154    
155        def test_auto_transient_table_title(self):
156            """Test AutoTransientTable.Title()"""
157            orig_table = DBFTable(os.path.join("..", "Data", "iceland",
158                                               "political.dbf"))
159            table = AutoTransientTable(self.transientdb, orig_table)
160            # The title is of course the same as that of the original table
161            self.assertEquals(table.Title(), orig_table.Title())
162    
163      def test_transient_joined_table(self):      def test_transient_joined_table(self):
164          """Test TransientJoinedTable"""          """Test TransientJoinedTable"""
165          simple = MemoryTable([("type", FIELDTYPE_STRING),          simple = MemoryTable([("type", FIELDTYPE_STRING),
# Line 198  class TestTransientTable(unittest.TestCa Line 208  class TestTransientTable(unittest.TestCa
208          # The TransientJoinedTable depends on both input tables          # The TransientJoinedTable depends on both input tables
209          self.assertEquals(table.Dependencies(), (landmarks, auto))          self.assertEquals(table.Dependencies(), (landmarks, auto))
210    
211            # The title is constructed from the titles of the input tables.
212            self.assertEquals(table.Title(),
213                              "Join of %s and %s" % (landmarks.Title(),
214                                                     auto.Title()))
215    
216    
217        def test_transient_joined_table_same_column_name(self):
218            """Test TransientJoinedTable join on columns with same name
219    
220            The transient DB maps the column names used by the tables to
221            another set of names used only inside the SQLite database. There
222            was a bug in the way this mapping was used when joining on
223            fields with the same names in both tables so that the joined
224            table ended up joining on the same column in the same table.
225            """
226            mem_stretches = MemoryTable([("stretch_id", FIELDTYPE_INT)],
227                                        [(i,) for i in range(4)])
228            stretches = AutoTransientTable(self.transientdb, mem_stretches)
229    
230            mem_discharges = MemoryTable([("disch_id", FIELDTYPE_INT),
231                                          ("stretch_id", FIELDTYPE_INT)],
232                                         [(1, 0), (2, 3)])
233            discharges = AutoTransientTable(self.transientdb, mem_discharges)
234    
235            table = TransientJoinedTable(self.transientdb, stretches, "stretch_id",
236                                         discharges, "stretch_id",
237                                         outer_join = True)
238    
239            self.assertEquals(table.NumRows(), 4)
240            self.assertEquals(table.NumColumns(), 3)
241    
242            # HasColumn
243            self.failUnless(table.HasColumn("stretch_id"))
244            self.failUnless(table.HasColumn("disch_id"))
245    
246    
247        def test_transient_joined_table_with_equal_column_names(self):
248            """Test TransientJoinedTable join on tables with equal column names
249    
250            If a name collision occurs for the field names, underscores are
251            appended as long as any collision is resolved.
252            """
253            mem_stretches = MemoryTable([("stretch_id", FIELDTYPE_INT),
254                                         ("name", FIELDTYPE_INT)],
255                                        [(0, 10), (1, 11), (2, 12), (3, 13) ])
256            stretches = AutoTransientTable(self.transientdb, mem_stretches)
257    
258            mem_discharges = MemoryTable([("disch_id", FIELDTYPE_INT),
259                                          ("stretch_id", FIELDTYPE_INT),
260                                          ("name", FIELDTYPE_INT)],
261                                         [(1, 0, 1), (2, 3, 2)])
262            discharges = AutoTransientTable(self.transientdb, mem_discharges)
263    
264            table = TransientJoinedTable(self.transientdb, stretches, "stretch_id",
265                                         discharges, "stretch_id",
266                                         outer_join = True)
267    
268            self.assertEquals(table.NumRows(), 4)
269            self.assertEquals(table.NumColumns(), 5)
270    
271            # HasColumn
272            self.assertEquals([c.name for c in table.Columns()],
273                              ["stretch_id", "name", "disch_id", "stretch_id_",
274                               "name_"])
275    
276        def test_transient_joined_table_name_collisions_dont_modify_in_place(self):
277            """Test TransientJoinedTable name-collisions do not modifying in place
278    
279            The name collision work-around by appending underscores
280            accidentally modified the column objects in place. We do two
281            joins therefore in reverse order to detect this: The first join
282            will lead to a modified name in the column object of the right
283            table which is then used as the left table in the second join so
284            the underscored name will appear before the non-underscored one
285            in the list of column names after the second join.
286            """
287            mem1 = MemoryTable([("stretch_id", FIELDTYPE_INT),
288                                ("name", FIELDTYPE_INT)],
289                               [(0, 10), (1, 11), (2, 12), (3, 13) ])
290            table1 = AutoTransientTable(self.transientdb, mem1)
291    
292            mem2 = MemoryTable([("stretch_id", FIELDTYPE_INT),
293                                ("name", FIELDTYPE_INT)],
294                               [(0, 10), (1, 11), (2, 12), (3, 13) ])
295            table2 = AutoTransientTable(self.transientdb, mem2)
296    
297            table = TransientJoinedTable(self.transientdb, table1, "stretch_id",
298                                         table2, "stretch_id", outer_join = True)
299            table = TransientJoinedTable(self.transientdb, table2, "stretch_id",
300                                         table1, "stretch_id", outer_join = True)
301    
302            self.assertEquals([c.name for c in table.Columns()],
303                              ["stretch_id", "name", "stretch_id_", "name_"])
304    
305      def test_transient_table_read_twice(self):      def test_transient_table_read_twice(self):
306          """Test TransientTable.ReadRowAsDict() reading the same record twice"""          """Test TransientTable.ReadRowAsDict() reading the same record twice"""
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