mirror of
https://github.com/hwchase17/langchain
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89 lines
2.9 KiB
Python
89 lines
2.9 KiB
Python
"""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 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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"Table 'company' has columns: company_id (INTEGER), "
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"company_location (VARCHAR).",
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"Table 'user' has columns: user_id (INTEGER), user_name (VARCHAR(16)).",
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)
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assert sorted(output.split("\n")) == sorted(expected_output)
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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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"Table 'company' has columns: company_id (INTEGER), "
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"company_location (VARCHAR).\n"
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"Table 'user' has columns: user_id (INTEGER), "
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"user_name (VARCHAR(16)). Here is an example of 2 rows "
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"from this table (long strings are truncated):\n13 Harrison\n14 Chase"
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)
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assert sorted(output.split("\n")) == sorted(expected_output.split("\n"))
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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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