forked from Archives/langchain
123 lines
3.5 KiB
Python
123 lines
3.5 KiB
Python
# flake8: noqa=E501
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"""Test SQL database wrapper."""
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from sqlalchemy import Column, Integer, MetaData, String, Table, create_engine, insert
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from langchain.sql_database import _TEMPLATE_PREFIX, SQLDatabase
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metadata_obj = MetaData()
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user = Table(
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"user",
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metadata_obj,
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Column("user_id", Integer, primary_key=True),
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Column("user_name", String(16), nullable=False),
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)
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company = Table(
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"company",
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metadata_obj,
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Column("company_id", Integer, primary_key=True),
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Column("company_location", String, nullable=False),
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)
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def test_table_info() -> None:
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"""Test that table info is constructed properly."""
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engine = create_engine("sqlite:///:memory:")
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metadata_obj.create_all(engine)
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db = SQLDatabase(engine)
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output = db.table_info
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expected_output = """
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CREATE TABLE user (
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user_id INTEGER NOT NULL,
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user_name VARCHAR(16) NOT NULL,
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PRIMARY KEY (user_id)
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)
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SELECT * FROM 'user' LIMIT 3
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user_id user_name
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CREATE TABLE company (
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company_id INTEGER NOT NULL,
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company_location VARCHAR NOT NULL,
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PRIMARY KEY (company_id)
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)
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SELECT * FROM 'company' LIMIT 3
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company_id company_location
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"""
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assert sorted(" ".join(output.split())) == sorted(" ".join(expected_output.split()))
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def test_table_info_w_sample_rows() -> None:
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"""Test that table info is constructed properly."""
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engine = create_engine("sqlite:///:memory:")
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metadata_obj.create_all(engine)
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values = [
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{"user_id": 13, "user_name": "Harrison"},
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{"user_id": 14, "user_name": "Chase"},
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]
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stmt = insert(user).values(values)
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with engine.begin() as conn:
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conn.execute(stmt)
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db = SQLDatabase(engine, sample_rows_in_table_info=2)
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output = db.table_info
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expected_output = """
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CREATE TABLE company (
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company_id INTEGER NOT NULL,
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company_location VARCHAR NOT NULL,
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PRIMARY KEY (company_id)
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)
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SELECT * FROM 'company' LIMIT 2
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company_id company_location
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CREATE TABLE user (
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user_id INTEGER NOT NULL,
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user_name VARCHAR(16) NOT NULL,
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PRIMARY KEY (user_id)
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)
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SELECT * FROM 'user' LIMIT 2
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user_id user_name
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13 Harrison
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14 Chase
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"""
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assert sorted(output.split()) == sorted(expected_output.split())
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def test_sql_database_run() -> None:
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"""Test that commands can be run successfully and returned in correct format."""
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engine = create_engine("sqlite:///:memory:")
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metadata_obj.create_all(engine)
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stmt = insert(user).values(user_id=13, user_name="Harrison")
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with engine.begin() as conn:
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conn.execute(stmt)
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db = SQLDatabase(engine)
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command = "select user_name from user where user_id = 13"
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output = db.run(command)
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expected_output = "[('Harrison',)]"
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assert output == expected_output
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def test_sql_database_run_update() -> None:
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"""Test commands which return no rows return an empty string."""
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engine = create_engine("sqlite:///:memory:")
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metadata_obj.create_all(engine)
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stmt = insert(user).values(user_id=13, user_name="Harrison")
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with engine.begin() as conn:
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conn.execute(stmt)
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db = SQLDatabase(engine)
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command = "update user set user_name='Updated' where user_id = 13"
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output = db.run(command)
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expected_output = ""
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assert output == expected_output
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