import testenv; testenv.configure_for_tests() from sqlalchemy import * from sqlalchemy import exceptions from testlib import * from sqlalchemy.engine import default # TODO: either create a mock dialect with named paramstyle and a short identifier length, # or find a way to just use sqlite dialect and make those changes IDENT_LENGTH = 29 class LabelTypeTest(TestBase): def test_type(self): m = MetaData() t = Table('sometable', m, Column('col1', Integer), Column('col2', Float)) assert isinstance(t.c.col1.label('hi').type, Integer) assert isinstance(select([t.c.col2]).as_scalar().label('lala').type, Float) class LongLabelsTest(TestBase, AssertsCompiledSQL): def setUpAll(self): global metadata, table1, maxlen metadata = MetaData(testing.db) table1 = Table("some_large_named_table", metadata, Column("this_is_the_primarykey_column", Integer, Sequence("this_is_some_large_seq"), primary_key=True), Column("this_is_the_data_column", String(30)) ) metadata.create_all() maxlen = testing.db.dialect.max_identifier_length testing.db.dialect.max_identifier_length = IDENT_LENGTH def tearDown(self): table1.delete().execute() def tearDownAll(self): metadata.drop_all() testing.db.dialect.max_identifier_length = maxlen def test_too_long_name_disallowed(self): m = MetaData(testing.db) t1 = Table("this_name_is_too_long_for_what_were_doing_in_this_test", m, Column('foo', Integer)) self.assertRaises(exceptions.IdentifierError, m.create_all) self.assertRaises(exceptions.IdentifierError, m.drop_all) self.assertRaises(exceptions.IdentifierError, t1.create) self.assertRaises(exceptions.IdentifierError, t1.drop) def test_result(self): table1.insert().execute(**{"this_is_the_primarykey_column":1, "this_is_the_data_column":"data1"}) table1.insert().execute(**{"this_is_the_primarykey_column":2, "this_is_the_data_column":"data2"}) table1.insert().execute(**{"this_is_the_primarykey_column":3, "this_is_the_data_column":"data3"}) table1.insert().execute(**{"this_is_the_primarykey_column":4, "this_is_the_data_column":"data4"}) s = table1.select(use_labels=True, order_by=[table1.c.this_is_the_primarykey_column]) r = s.execute() result = [] for row in r: result.append((row[table1.c.this_is_the_primarykey_column], row[table1.c.this_is_the_data_column])) assert result == [ (1, "data1"), (2, "data2"), (3, "data3"), (4, "data4"), ], repr(result) # some dialects such as oracle (and possibly ms-sql in a future version) # generate a subquery for limits/offsets. # ensure that the generated result map corresponds to the selected table, not # the select query r = s.limit(2).execute() result = [] for row in r: result.append((row[table1.c.this_is_the_primarykey_column], row[table1.c.this_is_the_data_column])) assert result == [ (1, "data1"), (2, "data2"), ], repr(result) r = s.limit(2).offset(1).execute() result = [] for row in r: result.append((row[table1.c.this_is_the_primarykey_column], row[table1.c.this_is_the_data_column])) assert result == [ (2, "data2"), (3, "data3"), ], repr(result) def test_colbinds(self): table1.insert().execute(**{"this_is_the_primarykey_column":1, "this_is_the_data_column":"data1"}) table1.insert().execute(**{"this_is_the_primarykey_column":2, "this_is_the_data_column":"data2"}) table1.insert().execute(**{"this_is_the_primarykey_column":3, "this_is_the_data_column":"data3"}) table1.insert().execute(**{"this_is_the_primarykey_column":4, "this_is_the_data_column":"data4"}) r = table1.select(table1.c.this_is_the_primarykey_column == 4).execute() assert r.fetchall() == [(4, "data4")] r = table1.select(or_( table1.c.this_is_the_primarykey_column == 4, table1.c.this_is_the_primarykey_column == 2 )).execute() assert r.fetchall() == [(2, "data2"), (4, "data4")] def test_insert_no_pk(self): table1.insert().execute(**{"this_is_the_data_column":"data1"}) table1.insert().execute(**{"this_is_the_data_column":"data2"}) table1.insert().execute(**{"this_is_the_data_column":"data3"}) table1.insert().execute(**{"this_is_the_data_column":"data4"}) def test_subquery(self): # this is the test that fails if the "max identifier length" is shorter than the # length of the actual columns created, because the column names get truncated. # if you try to separate "physical columns" from "labels", and only truncate the labels, # the compiler.DefaultCompiler.visit_select() logic which auto-labels columns in a subquery (for the purposes of sqlite compat) breaks the code, # since it is creating "labels" on the fly but not affecting derived columns, which think they are # still "physical" q = table1.select(table1.c.this_is_the_primarykey_column == 4).alias('foo') x = select([q]) print x.execute().fetchall() def test_anon_alias(self): compile_dialect = default.DefaultDialect() compile_dialect.max_identifier_length = IDENT_LENGTH q = table1.select(table1.c.this_is_the_primarykey_column == 4).alias() x = select([q], use_labels=True) self.assert_compile(x, "SELECT anon_1.this_is_the_primarykey_column AS anon_1_this_is_the_prim_1, anon_1.this_is_the_data_column AS anon_1_this_is_the_data_2 " "FROM (SELECT some_large_named_table.this_is_the_primarykey_column AS this_is_the_primarykey_column, some_large_named_table.this_is_the_data_column AS this_is_the_data_column " "FROM some_large_named_table " "WHERE some_large_named_table.this_is_the_primarykey_column = :this_is_the_primarykey__1) AS anon_1", dialect=compile_dialect) print x.execute().fetchall() def test_oid(self): """test that a primary key column compiled as the 'oid' column gets proper length truncation""" from sqlalchemy.databases import postgres dialect = postgres.PGDialect() dialect.max_identifier_length = 30 tt = table1.select(use_labels=True).alias('foo') x = select([tt], use_labels=True, order_by=tt.oid_column).compile(dialect=dialect) #print x # assert it doesnt end with "ORDER BY foo.some_large_named_table_this_is_the_primarykey_column" assert str(x).endswith("""ORDER BY foo.some_large_named_table_t_2""") if __name__ == '__main__': testenv.main()