示例

sqlalchemy 2.0.51: engine.Connection

已验证示例 — pypi sqlalchemy 2.0.51: engine.Connection. contract 在 python 3.12 · linux debian/x64 · docker 上运行并通过： create_engine('sqlite:///:memory:').connect()…

sha256:9bd44d3d153af497b5634b43909b88062abdaed9f6bdca5ef0770330f1a4953b

MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据: 签名契约通过
验证回执: 1
构建过它的签名密钥: 1

声明的环境 python 3.12 linux 24 · ubuntu · glibc 2.39 x64 python 3.12 python pip

验证运行环境

环境	契约	阶段	运行日期
python 3.12 · linux debian/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1python:3.12-slim@sha256:09f7da3bc104…	2026-09-04

案例

HOW

目标: verify sqlalchemy.engine.Connection in pkg:pypi/sqlalchemy@2.0.51
包: sqlalchemy 2.0.51
符号: sqlalchemy.engine.Connection
环境: python 3.12
创建时间: 2026-09-04T07:41:07Z

契约

create_engine('sqlite:///:memory:').connect() returns a Connection instance
Connection.execute(statement) executes SQL statements and returns a CursorResult
Connection.scalar(statement) returns the first column of the first row
Connection.commit() commits the current transaction
Connection.rollback() rolls back the current transaction
Connection.close() closes the connection and sets Connection.closed to True

文件

LICENSE
PROMPT.md
README.md
csx.json
pyproject.toml
requirements.txt
spec.json
src/main.py
test/contract.py
uv.lock

下载源代码构件 (tar.gz)

源代码

LICENSE

MIT No Attribution

Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

PROMPT.md

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify sqlalchemy.engine.Connection in pkg:pypi/sqlalchemy@2.0.51
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:pypi/sqlalchemy@2.0.51
Demonstrate these symbols/APIs:
  - sqlalchemy.engine.Connection

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

README.md

# verify sqlalchemy.engine.Connection

Minimal sample demonstrating and verifying `sqlalchemy.engine.Connection` in `sqlalchemy==2.0.51`.

## Contract

- `create_engine('sqlite:///:memory:').connect()` creates and returns an open `Connection` instance.
- `Connection.execute(statement)` executes SQL statements against the engine and returns a `CursorResult`.
- `Connection.scalar(statement)` executes and retrieves the first column of the first row.
- `Connection.commit()` commits the active transaction.
- `Connection.rollback()` rolls back uncommitted changes.
- `Connection.close()` closes the connection, setting `closed` to `True`.

csx.json

{"case":{"caseId":"case:sha256:cb108a103ad68668221160ad8ca56e4a6b631ef4e0efcbe144b82dd2822ffa3e","contract":["create_engine('sqlite:///:memory:').connect() returns a Connection instance","Connection.execute(statement) executes SQL statements and returns a CursorResult","Connection.scalar(statement) returns the first column of the first row","Connection.commit() commits the current transaction","Connection.rollback() rolls back the current transaction","Connection.close() closes the connection and sets Connection.closed to True"],"goal":"verify sqlalchemy.engine.Connection in pkg:pypi/sqlalchemy@2.0.51","kind":"HOW","packages":["pkg:pypi/sqlalchemy@2.0.51"],"schemaVersion":1,"symbols":["sqlalchemy.engine.Connection"]},"contractCommand":["python","test/contract.py"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"pypi","language":"python","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"pip","runtime":"python","runtimeVersion":"3.12","schemaVersion":1},"license":"MIT-0","packages":["pkg:pypi/sqlalchemy@2.0.51"],"schemaVersion":1,"subject":"pkg:pypi/sqlalchemy@2.0.51","symbols":["sqlalchemy.engine.Connection"],"verifierAdapter":"python@1"}

pyproject.toml

[project]
name = "sample-sqlalchemy"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = [
    "sqlalchemy==2.0.51",
]

requirements.txt

# This file was autogenerated by uv via the following command:
#    uv export --format requirements-txt --no-dev --no-hashes
greenlet==3.5.5 ; platform_machine == 'AMD64' or platform_machine == 'WIN32' or platform_machine == 'aarch64' or platform_machine == 'amd64' or platform_machine == 'ppc64le' or platform_machine == 'win32' or platform_machine == 'x86_64'
    # via sqlalchemy
sqlalchemy==2.0.51
    # via sample-sqlalchemy
typing-extensions==4.16.0
    # via sqlalchemy

spec.json

{
  "schemaVersion": 1,
  "goal": "verify sqlalchemy.engine.Connection in pkg:pypi/sqlalchemy@2.0.51",
  "kind": "HOW",
  "packages": [
    "pkg:pypi/sqlalchemy@2.0.51"
  ],
  "symbols": [
    "sqlalchemy.engine.Connection"
  ]
}

src/main.py

from sqlalchemy import create_engine, text
from sqlalchemy.engine import Connection


def demonstrate_connection():
    engine = create_engine("sqlite:///:memory:")
    with engine.connect() as conn:
        conn.execute(text("CREATE TABLE demo (id INTEGER PRIMARY KEY, msg TEXT)"))
        conn.execute(text("INSERT INTO demo (id, msg) VALUES (1, 'hello')"))
        conn.commit()
        val = conn.scalar(text("SELECT msg FROM demo WHERE id = 1"))
        print(f"Retrieved: {val}")


if __name__ == "__main__":
    demonstrate_connection()

test/contract.py

from sqlalchemy import create_engine, text
from sqlalchemy.engine import Connection, CursorResult


def test_connection_contract():
    # 1. create_engine and obtain Connection instance
    engine = create_engine("sqlite:///:memory:")
    conn = engine.connect()
    assert isinstance(conn, Connection), "Expected an instance of sqlalchemy.engine.Connection"
    assert not conn.closed, "Connection should be open initially"

    # 2. Connection.execute() returning CursorResult
    result = conn.execute(text("CREATE TABLE items (id INTEGER PRIMARY KEY, title TEXT)"))
    assert isinstance(result, CursorResult), "Expected execute() to return CursorResult"

    conn.execute(text("INSERT INTO items (id, title) VALUES (:id, :title)"), [{"id": 1, "title": "first"}])
    conn.commit()

    # 3. Connection.scalar() retrieving first column of first row
    val = conn.scalar(text("SELECT title FROM items WHERE id = 1"))
    assert val == "first", f"Expected 'first', got {val}"

    num = conn.scalar(text("SELECT 42"))
    assert num == 42, f"Expected 42, got {num}"

    # 4. Connection.rollback() rolling back uncommitted statements
    conn.execute(text("INSERT INTO items (id, title) VALUES (2, 'second')"))
    conn.rollback()
    count = conn.scalar(text("SELECT count(*) FROM items WHERE id = 2"))
    assert count == 0, f"Expected uncommitted insert to be rolled back, count is {count}"

    # 5. Connection as a context manager automatically closes
    with engine.connect() as context_conn:
        assert isinstance(context_conn, Connection)
        assert not context_conn.closed
        res = context_conn.scalar(text("SELECT 100"))
        assert res == 100
    assert context_conn.closed, "Context manager should close the connection"

    # 6. Explicit Connection.close()
    conn.close()
    assert conn.closed, "Connection.closed should be True after close()"

    print("All sqlalchemy.engine.Connection contract assertions passed.")


if __name__ == "__main__":
    test_connection_contract()

uv.lock

version = 1
revision = 3
requires-python = ">=3.12"

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