mirror of
https://github.com/hwchase17/langchain
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67 lines
1.8 KiB
Python
67 lines
1.8 KiB
Python
"""Test SQL database wrapper with schema support.
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Using DuckDB as SQLite does not support schemas.
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"""
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from sqlalchemy import (
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Column,
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Integer,
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MetaData,
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Sequence,
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String,
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Table,
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create_engine,
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event,
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insert,
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schema,
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)
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from langchain.sql_database import SQLDatabase
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metadata_obj = MetaData()
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event.listen(metadata_obj, "before_create", schema.CreateSchema("schema_a"))
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event.listen(metadata_obj, "before_create", schema.CreateSchema("schema_b"))
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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, Sequence("user_id_seq"), primary_key=True),
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Column("user_name", String, nullable=False),
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schema="schema_a",
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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, Sequence("company_id_seq"), primary_key=True),
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Column("company_location", String, nullable=False),
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schema="schema_b",
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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("duckdb:///:memory:")
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metadata_obj.create_all(engine)
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db = SQLDatabase(engine, schema="schema_a")
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output = db.table_info
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expected_output = (
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"Table 'user' has columns: user_id (INTEGER), user_name (VARCHAR).",
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)
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assert sorted(output.split("\n")) == sorted(expected_output)
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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("duckdb:///: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, schema="schema_a")
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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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