我要评论测试环境：
- 操作系统：centos 7.9 64-bit
- 数据库版本：gbase8sv8.8_aee_3.0.0_1，对应的csdk版本为3.0.0_1
1，确认安装python3
确认已经安装python3和python3-devel
[root@localhost test]# python3 -v python 3.6.8
如果没有安装，建议使用yum install python3来安装。
升级pip的版本
[root@localhost test]# python3 -m pip install --upgrade --force-reinstall pip
warning: running pip install with root privileges is generally not a good idea. try `__main__.py install --user` instead.
collecting pip
downloading https://files.pythonhosted.org/packages/a4/6d/6463d49a933f547439d6b5b98b46af8742cc03ae83543e4d7688c2420f8b/pip-21.3.1-py3-none-any.whl (1.7mb)
100% |████████████████████████████████| 1.7mb 235kb/s
installing collected packages: pip
successfully installed pip-21.3.1
[root@localhost test]# pip3 list
warning: pip is being invoked by an old script wrapper. this will fail in a future version of pip.
please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
to avoid this problem you can invoke python with '-m pip' instead of running pip directly.
package version
---------- -------
pip 21.3.1
setuptools 39.2.02，安装gbase 8s数据库连接工具（csdk）
可以直接下载免安装版本的csdk驱动：
链接：https://pan.baidu.com/s/1s9ew3vorznlj6udhubietg?pwd=ejfb
提取码：ejfb
解压到指定目录/opt下，生成/opt/gbase8s-odbc-driver目录
[root@localhost test]# ll 总用量 35188 -rw-r--r--. 1 root root 36029237 3月 11 20:52 gbase8s_3.0.0_1-linux64-odbc-driver.tar.gz [root@localhost test]# tar -zxf gbase8s_3.0.0_1-linux64-odbc-driver.tar.gz -c /opt/ [root@localhost test]# cd /opt/ [root@localhost opt]# ll 总用量 4 drwxr-xr-x. 20 gbasedbt gbasedbt 4096 3月 10 15:14 gbase drwxrwxr-x. 9 1001 1003 88 12月 13 2020 gbase8s-odbc-driver drwxr-xr-x. 2 root root 6 10月 31 2018 rh
创建必须的环境变量，并使环境生效
export gbasedbtdir=/opt/gbase8s-odbc-driver export csdk_home=/opt/gbase8s-odbc-driver export path=$gbasedbtdir/bin:$path export ld_library_path=$gbasedbtdir/lib:$gbasedbtdir/lib/cli:$gbasedbtdir/lib/esql:$ld_library_path
创建sqlhosts配置文件
[root@localhost test]# vi /opt/gbase8s-odbc-driver/etc/sqlhosts [root@localhost test]# more /opt/gbase8s-odbc-driver/etc/sqlhosts gbase01 onsoctcp a02.gbasedbt.com 9088
3，安装sqlalchemy-gbasedbt
3.1, 在线安装sqlalchemy-gbasedbt
确认python3、python3-devel和gcc均已经安装，csdk也已经安装以及环境变量已经配置的情况下，可直连网络的情况下，可使用pip3 install sqlalchemy-gbasedbt直接安装
[root@localhost test]# pip3 install sqlalchemy-gbasedbt
collecting sqlalchemy-gbasedbt
using cached sqlalchemy_gbasedbt-0.2.4-py3-none-any.whl (10 kb)
collecting dbtpy
using cached dbtpy-3.0.5.4.tar.gz (162 kb)
preparing metadata (setup.py) ... done
requirement already satisfied: sqlalchemy in /usr/local/lib64/python3.6/site-packages (from sqlalchemy-gbasedbt) (1.4.46)
requirement already satisfied: greenlet!=0.4.17 in /usr/local/lib64/python3.6/site-packages (from sqlalchemy->sqlalchemy-gbasedbt) (2.0.2)
requirement already satisfied: importlib-metadata in /usr/local/lib/python3.6/site-packages (from sqlalchemy->sqlalchemy-gbasedbt) (4.8.3)
requirement already satisfied: typing-extensions>=3.6.4 in /usr/local/lib/python3.6/site-packages (from importlib-metadata->sqlalchemy->sqlalchemy-gbasedbt) (4.1.1)
requirement already satisfied: zipp>=0.5 in /usr/local/lib/python3.6/site-packages (from importlib-metadata->sqlalchemy->sqlalchemy-gbasedbt) (3.6.0)
using legacy 'setup.py install' for dbtpy, since package 'wheel' is not installed.
installing collected packages: dbtpy, sqlalchemy-gbasedbt
running setup.py install for dbtpy ... done
successfully installed dbtpy-3.0.5.4 sqlalchemy-gbasedbt-0.2.4将同时安装依赖包：sqlalchemy、greenlet、importlib-metadata、typing-extensions、zipp和dbtpy，安装后的pip3列表如下：
[root@localhost test]# pip3 list package version ------------------- ------- dbtpy 3.0.5.4 greenlet 2.0.2 importlib-metadata 4.8.3 pip 21.3.1 setuptools 39.2.0 sqlalchemy 1.4.46 sqlalchemy-gbasedbt 0.2.4 typing_extensions 4.1.1 zipp 3.6.0
4，编写测试demo，执行测试
测试demo文件
#!/usr/bin/env python3
# filename: testsqlalchemy_gbasedbt
from sqlalchemy import metadata, table, column, string, create_engine
from sqlalchemy.dialects import registry
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
registry.register("gbasedbt", "sqlalchemy_gbasedbt.dbtdb", "gbasedbtdialect")
# 创建对象的基类:
base = declarative_base()
# 定义user对象:
class user(base):
# 表的名字:
__tablename__ = 'user'
# 表的结构:
id = column(string(20), primary_key=true)
name = column(string(20))
# 初始化数据库连接:
# constr = 'gbasedbt://<username>:<password>@<host name>:<port number>/<databasename>;server=<server name>'
constr = 'gbasedbt://gbasedbt:gbase123@a02.gbasedbt.com:9088/testdb;server=gbase01;db_locale=zh_cn.utf8;client_locale=zh_cn.utf8;delimident=y'
engine = create_engine(constr)
# 创建对象
base.metadata.create_all(engine)
# 创建dbsession类型:
dbsession = sessionmaker(bind=engine)
# 创建session对象:
session = dbsession()
# 创建新user对象:
new_user = user(id='2', name='测试用户')
# 添加到session:
session.add(new_user)
# 提交即保存到数据库:
session.commit()
# 关闭session:
session.close()
# 创建session:
session = dbsession()
# 创建query查询，filter是where条件，最后调用one()返回唯一行，如果调用all()则返回所有行:
user = session.query(user).filter(user.id=='2').one()
# 打印类型和对象的name属性:
print('type:', type(user))
print('name:', user.name)
# 关闭session:
session.close()测试结果：
[root@localhost test]# ./testsqlalchemy_gbasedbt.py
type: <class '__main__.user'>
name: 测试用户
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