mysqlalchmy操作之建表

1　创建链接基础类。

# -*- coding=utf-8 -*-

import os

from sqlalchemy import (create_engine,MetaData)

from sqlalchemy.orm import sessionmaker

from sqlalchemy.ext.declarative import declarative_base

from config.config import db_args

def get_engine_():

    args=db_args()

    password = os.getenv('DB_PASS', args['passwd'])

    charset = os.getenv('CharSet', args['charset'])

    connect_str= "{}+pymysql://{}:{}@{}:{}/{}?charset={}".format(args['db_type'], args['user'], password,args['host'], args['port'], args['db'],charset)

    engine=create_engine(connect_str)

    return engine

eng=get_engine_()

Base=declarative_base()#生成一个SqlORM 基类

Session=sessionmaker(bind=eng)#bind绑定,创建与数据库的会话session class

db_session=Session()

metadata=MetaData(get_engine_()) #

__all__ = ['eng', 'Base', 'db_session', 'metadata']  #它是一个string元素组成的list变量

　　2.设计需要的表的字段

# -*- coding=utf-8 -*-

from sqlalchemy import (

    Table, Column, INTEGER, String, Text,DateTime)

from .basic import metadata

import datetime

#user_info

user_info=Table("user_info",metadata,

                Column("id",INTEGER,primary_key=True,autoincrement=True),

                Column("login_id",String(200)),

                Column("login_pwd",String(200)),

                Column("user_name",String(200)),

                Column("domain_id",String(6), default=100505, server_default='100505'),

                Column("user_id",String(200)),

                Column("enable",String(2),default=1,server_default='1'),

                Column("need_comment", String(2), default=1, server_default='1'),

                Column("need_days", String(20), default=30, server_default='30'),

                Column("update_time",DateTime, default=datetime.datetime.utcnow,index=True),

                Column("create_user",String(200)),

    )

#home_info

home_info=Table("home_info",metadata,

                Column("id",INTEGER,primary_key=True,autoincrement=True),

                Column("user_id",String(200)),

                Column("user_name", String(200)),

                Column("follows_num",String(200),default=0, server_default='0'),

                Column("fans_num",String(200),default=0, server_default='0'),

                Column("wb_num",String(200),default=0, server_default='0'),

                Column("home_url", String(200)),

                Column("update_time", DateTime, default=datetime.datetime.utcnow,index=True),

                Column("create_user", String(200)),

                )

#wb_info

wb_info=Table("wb_info",metadata,

                Column("id",INTEGER,primary_key=True,autoincrement=True),

                Column("uid",String(200)),

                Column("wb_id", String(200)),

                Column("wb_content", String(2000)),

                Column("read_num",String(200),default=0, server_default='0'),

                Column("share_num",String(200),default=0, server_default='0'),

                Column("comment_num",String(200),default=0, server_default='0'),

                Column("like_num", String(200),default=0, server_default='0'),

                Column("wb_url", String(200)),

                Column("wb_time", DateTime, default=datetime.datetime.utcnow,index=True),

                Column("wb_device", String(200)),

                Column("update_time", DateTime, default=datetime.datetime.utcnow,index=True),

                Column("create_user", String(200)),

                )

#comment_info

comment_info=Table("comment_info",metadata,

                Column("id",INTEGER,primary_key=True,autoincrement=True),

                Column("wb_Id",String(200),index=True),

                Column("comment_user",String(200)),

                Column("comment_time",DateTime, default=datetime.datetime.utcnow,index=True),

                Column("comment_content",String(2000)),

                Column("comment_id", String(200)),

                Column("ico_url", String(200)),

                Column("update_time", DateTime, default=datetime.datetime.utcnow,index=True),

                Column("create_user", String(200)),

                )

__all__ = ['user_info', 'home_info', 'wb_info', 'comment_info']

　　3.映射到实体

# -*- coding=utf-8 -*-

from dbs.basic import Base

from dbs.tables import *

#user_info

#home_info

#wb_info

#comment_info

class LoginInfo(Base):

    __table__=user_info

class HomeoData(Base):

    __table__=home_info

class WeiBoData(Base):

    __table__=wb_info

class CommentInfo(Base):

    __table__=comment_info

　　4.创建表

# -*- coding=utf-8 -*-

from dbs.tables import *

from dbs.basic import metadata ,eng

def create_all_table():

    # 创建数据表，如果数据表存在，则忽视

    metadata.create_all()

if __name__ == "__main__":

    try:

        create_all_table()

        print("create table successful.")

    except:

        print("create table failed !!!")