dmPython-pure

纯 Python 实现的 dmPython 兼容层：底层转发给 dm-pure（纯 Python 达梦 DM8 驱动）。

让依赖官方 dmPython 的库（如 dmSQLAlchemy，方言 dm+dmPython://）零修改可用—— 官方 dmPython 是 C 扩展（.pyd），在较新 Python 上编译困难；本包纯 Python，Python 3.8+ 直接可装。

安装

# 方式一：GitHub Releases / PyPI（pyc 字节码版，按 Python 版本选）
pip install dmPython-pure==1.0.0

# 方式二：源码构建（本仓库 shim/ 目录）
cd shim && pip install .

pyc 版 wheel 绑定 Python 版本（cp310 只能 Python 3.10 用），请选择与本地 Python 一致的版本。

使用（dmSQLAlchemy）

from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, Session

engine = create_engine("dm+dmPython://SYSDBA:password@127.0.0.1:5236/")

与官方 dmPython 完全相同的用法，无需任何改动。

直接使用（DB-API 2.0）

import dmPython
conn = dmPython.connect(host="127.0.0.1", port=5236, user="SYSDBA", password="...")
cur = conn.cursor()
cur.execute("SELECT id, name FROM t WHERE id = ?", [1])
print(cur.fetchall())
conn.close()

实现说明

paramstyle = "qmark"（与官方 dmPython 一致；SQLAlchemy 方言的 paramstyle 取自 dbapi.paramstyle）
INSERT 后 lastrowid 通过 SELECT @@IDENTITY 获取
补齐官方 Connection 特有属性：str_case_sensitive / local_code / server_version / current_schema / autoCommit
包内含 vendored dmpy（dm-pure 驱动），单 wheel 自包含、零外部依赖

已知限制

nextset 恒返回 None（不支持多结果集）
cursor.var（OUT/RETURNING 变量）为占位实现，INSERT..RETURNING 尚未完整支持
未实现异步（async）方言

发布

参考 .github/workflows/shim-release.yml：打 shim-v* tag 或手动触发，自动为各 Python 版本构建 pyc 版 wheel 并上传 GitHub Releases / PyPI。

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