def test_standalone_sqlalchemy_datasource(test_db_connection_string, sa):
datasource = SqlAlchemyDatasource(
"SqlAlchemy",
connection_string=test_db_connection_string,
echo=False,
batch_kwargs_generators={
"default": {
"class_name": "TableBatchKwargsGenerator"
}
},
)
assert set(
datasource.get_available_data_asset_names()["default"]["names"]) == {
("main.table_1", "table"),
("main.table_2", "table"),
}
batch_kwargs = datasource.build_batch_kwargs("default", "main.table_1")
batch = datasource.get_batch(batch_kwargs=batch_kwargs)
assert isinstance(batch, Batch)
batch_data = batch.data
assert isinstance(
batch_data,
great_expectations.dataset.sqlalchemy_dataset.SqlAlchemyBatchReference,
)
dataset = SqlAlchemyDataset(**batch.data.get_init_kwargs())
assert len(dataset.head(10)) == 5
def test_sqlalchemy_source_limit(sqlitedb_engine):
df1 = pd.DataFrame({
'col_1': [1, 2, 3, 4, 5],
'col_2': ['a', 'b', 'c', 'd', 'e']
})
df2 = pd.DataFrame({
'col_1': [0, 1, 2, 3, 4],
'col_2': ['b', 'c', 'd', 'e', 'f']
})
df1.to_sql('table_1', con=sqlitedb_engine, index=True)
df2.to_sql('table_2', con=sqlitedb_engine, index=True, schema='main')
datasource = SqlAlchemyDatasource('SqlAlchemy', engine=sqlitedb_engine)
limited_batch = datasource.get_batch({
"table": "table_1",
"limit": 1,
"offset": 2
})
assert isinstance(limited_batch, Batch)
limited_dataset = Validator(
limited_batch,
expectation_suite=ExpectationSuite("test"),
expectation_engine=SqlAlchemyDataset).get_dataset()
assert limited_dataset._table.name.startswith(
"ge_tmp_") # we have generated a temporary table
assert len(limited_dataset.head(10)) == 1 # and it is only one row long
assert limited_dataset.head(
10)['col_1'][0] == 3 # offset should have been applied
def test_sqlalchemy_source_templating(sqlitedb_engine, empty_data_context):
context: DataContext = empty_data_context
datasource = SqlAlchemyDatasource(
engine=sqlitedb_engine,
batch_kwargs_generators={
"foo": {
"class_name": "QueryBatchKwargsGenerator"
}
},
)
generator = datasource.get_batch_kwargs_generator("foo")
generator.add_query(data_asset_name="test",
query="select 'cat' as ${col_name};")
batch = datasource.get_batch(
generator.build_batch_kwargs(
"test", query_parameters={"col_name": "animal_name"}))
dataset = BridgeValidator(
batch,
expectation_suite=ExpectationSuite("test", data_context=context),
expectation_engine=SqlAlchemyDataset,
).get_dataset()
res = dataset.expect_column_to_exist("animal_name")
assert res.success is True
res = dataset.expect_column_values_to_be_in_set("animal_name", ["cat"])
assert res.success is True
def test_standalone_sqlalchemy_datasource(test_db_connection_string):
datasource = SqlAlchemyDatasource(
'SqlAlchemy', connection_string=test_db_connection_string, echo=False)
assert datasource.get_available_data_asset_names() == {"default": {"main.table_1", "main.table_2"}}
dataset1 = datasource.get_batch("main.table_1")
dataset2 = datasource.get_batch("main.table_2")
assert isinstance(dataset1, SqlAlchemyDataset)
assert isinstance(dataset2, SqlAlchemyDataset)
def test_query_generator_view(sqlite_view_engine):
datasource = SqlAlchemyDatasource(
engine=sqlite_view_engine,
batch_kwargs_generators={"table": {"class_name": "TableBatchKwargsGenerator"}},
) # Build a datasource with a queries generator to introspect our database with a view
names = set(datasource.get_available_data_asset_names()["table"]["names"])
# We should see both the table *and* the primary view, but *not* the temp view
assert names == {("main.test_table", "table"), ("main.test_view", "view")}
def test_sqlalchemy_source_limit(sqlitedb_engine):
df1 = pd.DataFrame({
'col_1': [1, 2, 3, 4, 5],
'col_2': ['a', 'b', 'c', 'd', 'e']
})
df2 = pd.DataFrame({
'col_1': [0, 1, 2, 3, 4],
'col_2': ['b', 'c', 'd', 'e', 'f']
})
df1.to_sql('table_1', con=sqlitedb_engine, index=True)
df2.to_sql('table_2', con=sqlitedb_engine, index=True, schema='main')
datasource = SqlAlchemyDatasource('SqlAlchemy', engine=sqlitedb_engine)
limited_dataset = datasource.get_data_asset("table_1",
"default",
limit=1,
offset=2)
assert isinstance(limited_dataset, SqlAlchemyDataset)
assert limited_dataset._table.name.startswith(
"ge_tmp_") # we have generated a temporary table
assert len(limited_dataset.head(10)) == 1 # and it is only one row long
assert limited_dataset.head(
10)['col_1'][0] == 3 # offset should have been applied
