创建使用 IAM 数据库身份验证的异步连接池

此代码段使用 AlloyDB 连接器创建 SQLAlchemy 异步连接池。使用此方法可安全地连接到数据库实例（使用 IAM 用户），而无需管理数据库密码。

代码示例

Python

如需向 AlloyDB 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅 为本地开发环境设置身份验证。 

import sqlalchemy
import sqlalchemy.ext.asyncio

from google.cloud.alloydbconnector import AsyncConnector


async def create_sqlalchemy_engine(
    inst_uri: str, user: str, db: str, refresh_strategy: str = "background"
) -> tuple[sqlalchemy.ext.asyncio.engine.AsyncEngine, AsyncConnector]:
    """Creates a connection pool for an AlloyDB instance and returns the pool
    and the connector. Callers are responsible for closing the pool and the
    connector.

    A sample invocation looks like:

        pool, connector = await create_sqlalchemy_engine(
            inst_uri,
            user,
            db,
        )
        async with pool.connect() as conn:
            time = (await conn.execute(sqlalchemy.text("SELECT NOW()"))).fetchone()
            conn.commit()
            curr_time = time[0]
            # do something with query result
            await connector.close()

    Args:
        instance_uri (str):
            The instance URI specifies the instance relative to the project,
            region, and cluster. For example:
            "projects/my-project/locations/us-central1/clusters/my-cluster/instances/my-instance"
        user (str):
            The formatted IAM database username.
            e.g., my-email@test.com, service-account@project-id.iam
        db (str):
            The name of the database, e.g., mydb
        refresh_strategy (Optional[str]):
            Refresh strategy for the AlloyDB Connector. Can be one of "lazy"
            or "background". For serverless environments use "lazy" to avoid
            errors resulting from CPU being throttled.
    """
    connector = AsyncConnector(refresh_strategy=refresh_strategy)

    # create async SQLAlchemy connection pool
    engine = sqlalchemy.ext.asyncio.create_async_engine(
        "postgresql+asyncpg://",
        async_creator=lambda: connector.connect(
            inst_uri,
            "asyncpg",
            user=user,
            db=db,
            enable_iam_auth=True,
        ),
        execution_options={"isolation_level": "AUTOCOMMIT"},
    )
    return engine, connector

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅Google Cloud 示例浏览器。