使用sqlalchemy-gbasedbt连接GBase 8s数据库的步骤详解

目录

• 1，确认安装python3
• 2，安装GBase 8s数据库连接工具（CSDK）
• 3，安装sqlalchemy-gbasedbt
• 3.1, 在线安装sqlalchemy-gbasedbt
• 4，编写测试Demo，执行测试

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 39.2.0

2，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://:@:/;SERVER='
ConStr = 'gbasedbt://gbasedbt:[email protected]: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:
name: 测试用户

到此这篇关于使用sqlalchemy-gbasedbt连接GBase 8s数据库的文章就介绍到这了,更多相关sqlalchemy-gbasedbt连接GBase 8s数据库内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！