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import os, datetime, decimal
import pytest
from unittest import skipIf
from sqlalchemy import create_engine, select, insert, Column, MetaData, Table
from sqlalchemy.orm import declarative_base, Session
from sqlalchemy.types import SMALLINT, Integer, BOOLEAN, String, DECIMAL, Date
USER_AGENT_TOKEN = "PySQL e2e Tests"
@pytest.fixture
def db_engine():
HOST = os.environ.get("host")
HTTP_PATH = os.environ.get("http_path")
ACCESS_TOKEN = os.environ.get("access_token")
CATALOG = os.environ.get("catalog")
SCHEMA = os.environ.get("schema")
connect_args = {"_user_agent_entry": USER_AGENT_TOKEN}
engine = create_engine(
f"databricks://token:{ACCESS_TOKEN}@{HOST}?http_path={HTTP_PATH}&catalog={CATALOG}&schema={SCHEMA}",
connect_args=connect_args,
)
return engine
@pytest.fixture()
def base(db_engine):
return declarative_base(bind=db_engine)
@pytest.fixture()
def session(db_engine):
return Session(bind=db_engine)
@pytest.fixture()
def metadata_obj(db_engine):
return MetaData(bind=db_engine)
def test_can_connect(db_engine):
simple_query = "SELECT 1"
result = db_engine.execute(simple_query).fetchall()
assert len(result) == 1
def test_connect_args(db_engine):
"""Verify that extra connect args passed to sqlalchemy.create_engine are passed to DBAPI
This will most commonly happen when partners supply a user agent entry
"""
conn = db_engine.connect()
connection_headers = conn.connection.thrift_backend._transport._headers
user_agent = connection_headers["User-Agent"]
expected = f"(sqlalchemy + {USER_AGENT_TOKEN})"
assert expected in user_agent
def test_pandas_upload(db_engine, metadata_obj):
import pandas as pd
SCHEMA = os.environ.get("schema")
try:
df = pd.read_excel("tests/sqlalchemy/demo_data/MOCK_DATA.xlsx")
df.to_sql(
"mock_data",
db_engine,
schema=SCHEMA,
index=False,
method="multi",
if_exists="replace",
)
df_after = pd.read_sql_table("mock_data", db_engine, schema=SCHEMA)
assert len(df) == len(df_after)
except Exception as e:
raise e
finally:
db_engine.execute("DROP TABLE mock_data")
def test_create_table_not_null(db_engine, metadata_obj):
table_name = "PySQLTest_{}".format(datetime.datetime.utcnow().strftime("%s"))
SampleTable = Table(
table_name,
metadata_obj,
Column("name", String(255)),
Column("episodes", Integer),
Column("some_bool", BOOLEAN, nullable=False),
)
metadata_obj.create_all()
columns = db_engine.dialect.get_columns(
connection=db_engine.connect(), table_name=table_name
)
name_column_description = columns[0]
some_bool_column_description = columns[2]
assert name_column_description.get("nullable") is True
assert some_bool_column_description.get("nullable") is False
metadata_obj.drop_all()
def test_bulk_insert_with_core(db_engine, metadata_obj, session):
import random
num_to_insert = random.choice(range(10_000, 20_000))
table_name = "PySQLTest_{}".format(datetime.datetime.utcnow().strftime("%s"))
names = ["Bim", "Miki", "Sarah", "Ira"]
SampleTable = Table(
table_name, metadata_obj, Column("name", String(255)), Column("number", Integer)
)
rows = [
{"name": names[i % 3], "number": random.choice(range(10000))}
for i in range(num_to_insert)
]
metadata_obj.create_all()
db_engine.execute(insert(SampleTable).values(rows))
rows = db_engine.execute(select(SampleTable)).fetchall()
assert len(rows) == num_to_insert
def test_create_insert_drop_table_core(base, db_engine, metadata_obj: MetaData):
""" """
SampleTable = Table(
"PySQLTest_{}".format(datetime.datetime.utcnow().strftime("%s")),
metadata_obj,
Column("name", String(255)),
Column("episodes", Integer),
Column("some_bool", BOOLEAN),
Column("dollars", DECIMAL(10, 2)),
)
metadata_obj.create_all()
insert_stmt = insert(SampleTable).values(
name="Bim Adewunmi", episodes=6, some_bool=True, dollars=decimal.Decimal(125)
)
with db_engine.connect() as conn:
conn.execute(insert_stmt)
select_stmt = select(SampleTable)
resp = db_engine.execute(select_stmt)
result = resp.fetchall()
assert len(result) == 1
metadata_obj.drop_all()
# ORM tests are made following this tutorial
# https://docs.sqlalchemy.org/en/14/orm/quickstart.html
@skipIf(False, "Unity catalog must be supported")
def test_create_insert_drop_table_orm(base, session: Session):
"""ORM classes built on the declarative base class must have a primary key.
This is restricted to Unity Catalog.
"""
class SampleObject(base):
__tablename__ = "PySQLTest_{}".format(datetime.datetime.utcnow().strftime("%s"))
name = Column(String(255), primary_key=True)
episodes = Column(Integer)
some_bool = Column(BOOLEAN)
base.metadata.create_all()
sample_object_1 = SampleObject(name="Bim Adewunmi", episodes=6, some_bool=True)
sample_object_2 = SampleObject(name="Miki Meek", episodes=12, some_bool=False)
session.add(sample_object_1)
session.add(sample_object_2)
session.commit()
stmt = select(SampleObject).where(
SampleObject.name.in_(["Bim Adewunmi", "Miki Meek"])
)
output = [i for i in session.scalars(stmt)]
assert len(output) == 2
base.metadata.drop_all()
def test_dialect_type_mappings(base, db_engine, metadata_obj: MetaData):
"""Confirms that we get back the same time we declared in a model and inserted using Core"""
SampleTable = Table(
"PySQLTest_{}".format(datetime.datetime.utcnow().strftime("%s")),
metadata_obj,
Column("string_example", String(255)),
Column("integer_example", Integer),
Column("boolean_example", BOOLEAN),
Column("decimal_example", DECIMAL(10, 2)),
Column("date_example", Date),
)
string_example = ""
integer_example = 100
boolean_example = True
decimal_example = decimal.Decimal(125)
date_example = datetime.date(2013, 1, 1)
metadata_obj.create_all()
insert_stmt = insert(SampleTable).values(
string_example=string_example,
integer_example=integer_example,
boolean_example=boolean_example,
decimal_example=decimal_example,
date_example=date_example,
)
with db_engine.connect() as conn:
conn.execute(insert_stmt)
select_stmt = select(SampleTable)
resp = db_engine.execute(select_stmt)
result = resp.fetchall()
this_row = result[0]
assert this_row["string_example"] == string_example
assert this_row["integer_example"] == integer_example
assert this_row["boolean_example"] == boolean_example
assert this_row["decimal_example"] == decimal_example
assert this_row["date_example"] == date_example
metadata_obj.drop_all()