sqlalchemy

Flask SQLAlchemy Foreign Key Relationships

由 陌路散爱 提交于 2021-02-16 04:42:16
问题 I'm having a lot of trouble getting my head around foreign keys and relationships in SQLAlchemy. I have two tables in my database. The first one is Request and the second one is Agent . Each Request contains one Agent and each Agent has one Request . class Request(db.Model): __tablename__ = 'request' reference = db.Column(db.String(10), primary_key=True) applicationdate = db.Column(db.DateTime) agent = db.ForeignKey('request.agent'), class Agent(db.Model): __tablename__ = 'agent' id = db

Flask知识总汇

由 独自空忆成欢 提交于 2021-02-13 05:27:30
Flask基础 Flask基础使用与配置 Flask路由系统与模板系统 Flask视图函数 Flask请求与响应 Flask的session操作 Flask中间件 Flask连接数据库 Flask使用原生SQL连接Mysql数据库数据池 Flask使用SQLAlchemy连接mysql SQLALchemy的其他常用操作 Flask第三方组件 Flask-SQLAlchemy WTForms flask-session flask-script flask-migrate pipreqs(自动生成需要导入的模块信息) virtualenv(虚拟环境) 信号 来源： oschina 链接： https://my.oschina.net/u/4403469/blog/3939948

superset在Centos7的安装

由 风格不统一 提交于 2021-02-12 02:00:49
在centos7下安装superset 主要参考资料：https://www.jianshu.com/p/fc24955e295d 感谢博主。 在安装过程中出现以下问题： 1.在创建用户时提示出错，缺少contextlib插件。直接安装通过 2.在superset db update时出错，提示 importerror: cannot import name encryptedtype 从网页https://github.com/apache/incubator-superset/issues/4953 查询资料发现要求 SQLAlchemy-Utils <0.33，使用pip show SQLAlchemy-Utils发现版本为0.33.2 使用pip install SQLAlchemy-Utils == 0.32.0 安装后，通过。 3.在安装完成后，mapbox报错：An error occurred while rendering the visualization: Error: An API access token is required to use Mapbox GL.。查询发现需在superset的config.py中添加mapbox_api_Key。默认脚本中此值为空。进行 www.mapbox.com 注册新账号。在 https://www.mapbox

PostgreSQL with SQLalchemy database is not found

由 梦想与她 提交于 2021-02-11 17:21:45
问题 I am using the following code to create postgresql database using sqlalchemy: engine=create_engine('postgresql+psycopg2://postgres@localhost/testData') Base.metadata.create_all(engine) But it gives me the following error even though I manually created the database in psql: File "/home/ubuntu/venve/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 376, in connect return self.dbapi.connect(*cargs, **cparams) File "/home/ubuntu/venve/local/lib/python2.7/site-packages/psycopg2

SQL Server queries beyond a certain character length are timing out

由 。_饼干妹妹 提交于 2021-02-11 16:33:44
问题 Recently I migrated an ETL platform from Python 2.7 to 3 and also updated its Docker image from Ubuntu 16.04 to 18.04. After the migration I started encountering some really strange behavior when trying to reflect SQL Server tables using SQLAlchemy with the pyodbc driver. Initially, I was seeing this error message: [08S01] [FreeTDS][SQL Server]Read from the server failed (20004) (SQLExecDirectW) I had updated SQLAlchemy from 0.9.8 to 1.3.10 (I hadn't touched pyodbc which was at 3.0.10) so I

SQL Server queries beyond a certain character length are timing out

由 谁说胖子不能爱 提交于 2021-02-11 16:31:51
问题 Recently I migrated an ETL platform from Python 2.7 to 3 and also updated its Docker image from Ubuntu 16.04 to 18.04. After the migration I started encountering some really strange behavior when trying to reflect SQL Server tables using SQLAlchemy with the pyodbc driver. Initially, I was seeing this error message: [08S01] [FreeTDS][SQL Server]Read from the server failed (20004) (SQLExecDirectW) I had updated SQLAlchemy from 0.9.8 to 1.3.10 (I hadn't touched pyodbc which was at 3.0.10) so I

SQL Server queries beyond a certain character length are timing out

由 送分小仙女□ 提交于 2021-02-11 16:31:31
问题 Recently I migrated an ETL platform from Python 2.7 to 3 and also updated its Docker image from Ubuntu 16.04 to 18.04. After the migration I started encountering some really strange behavior when trying to reflect SQL Server tables using SQLAlchemy with the pyodbc driver. Initially, I was seeing this error message: [08S01] [FreeTDS][SQL Server]Read from the server failed (20004) (SQLExecDirectW) I had updated SQLAlchemy from 0.9.8 to 1.3.10 (I hadn't touched pyodbc which was at 3.0.10) so I

SQL Server queries beyond a certain character length are timing out

由 淺唱寂寞╮ 提交于 2021-02-11 16:30:26
问题 Recently I migrated an ETL platform from Python 2.7 to 3 and also updated its Docker image from Ubuntu 16.04 to 18.04. After the migration I started encountering some really strange behavior when trying to reflect SQL Server tables using SQLAlchemy with the pyodbc driver. Initially, I was seeing this error message: [08S01] [FreeTDS][SQL Server]Read from the server failed (20004) (SQLExecDirectW) I had updated SQLAlchemy from 0.9.8 to 1.3.10 (I hadn't touched pyodbc which was at 3.0.10) so I

connecting to database using sqlalchemy using DATABASE_URL

由 为君一笑 提交于 2021-02-11 15:59:45
问题 I am comfortable in using SQL query languages and need to develop a web application. I am learning python -sqlachemy and stuck in get connected to postgressql database. Please let me know: what are the libraries i need to install ? How do i Configure DATABASE_URL in flask.[enter image description here][1] I am stuck with code line no-6. I need to know how to get DATABASE_URL configured? I am very new potgressql. [1]: https://i.stack.imgur.com/7oGRC.png 回答1: You can set it up in bash or you

connecting to database using sqlalchemy using DATABASE_URL

由 |▌冷眼眸甩不掉的悲伤 提交于 2021-02-11 15:59:41
问题 I am comfortable in using SQL query languages and need to develop a web application. I am learning python -sqlachemy and stuck in get connected to postgressql database. Please let me know: what are the libraries i need to install ? How do i Configure DATABASE_URL in flask.[enter image description here][1] I am stuck with code line no-6. I need to know how to get DATABASE_URL configured? I am very new potgressql. [1]: https://i.stack.imgur.com/7oGRC.png 回答1: You can set it up in bash or you
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