declarative | 易学教程

How to automatically reflect database to sqlalchemy declarative?

阅读更多关于 How to automatically reflect database to sqlalchemy declarative?

sqlautocode - has issues with many-to-many relations sqlsoup - doesn't support relations elixir - it's note auto-generate Is there something else I could try? In theory reflection in sqlalchemy should work for you. In this case I'm using an mssql database with two tables which have a simple Many-to-one relation: "Tests" with fields: id testname author_id (foreign key to the Users table, Users.id field) "Users" with fields: id fullname So the following should reflect the database: from sqlalchemy import * from sqlalchemy.orm import create_session from sqlalchemy.ext.declarative import

Very simple, terse and easy GUI programming “frameworks” [closed]

阅读更多关于 Very simple, terse and easy GUI programming “frameworks” [closed]

Please list GUI programming libraries, toolkits, frameworks which allow to write GUI apps quickly . I mean in such a way, that GUI is described entirely in a human-readable (and human-writable) plain text file (code) code is terse (1 or 2 lines of code per widget/event pair), suitable for scripting structure and operation of the GUI is evident from the code (nesting of widgets and flow of events) details about how to build the GUI are hidden (things like mainloop, attaching event listeners, etc.) auto-layouts are supported (vboxes, hboxes, etc.) As answers suggest, this may be defined as

I'm curious if Logic Programs can do algebra

阅读更多关于 I'm curious if Logic Programs can do algebra

问题 I read a brief article about Prolog and Logic Programming. I'm curious if Logic Programs can do algebra. Like would you be able to ask what the Variable of X is in the equation 5+X = 7 and get an answer of -2? 回答1: All serious Prolog systems provide constraint logic programming over finite domains, called CLP(FD) for short, with which you can solve many such equations easily. For example, with SICStus Prolog, SWI and Yap: ?- use_module(library(clpfd)). true. ?- 5+X #= 7. X = 2. Apparently,

Prolog List Plateau

阅读更多关于 Prolog List Plateau

Just got introduced to prolog, trying to get through some simple exercises, but I've been getting kind of stuck on this one. I'm trying to write a program that outputs all the sublists of the input list, where each sublist has length > 1 and it cannot be extended to a larger sublist. It will also output the starting position in the list of the sublist. So a sample output would be | ?- plateau([a,a,b,2,2,2,a+1,a+1,s(1,2)], I, Len). I = 1, Len = 2 ? ; I = 4, Len = 3 ? ; I = 7, Len = 2 ? ; no I'm still pretty confused by the whole declarative thing, and having a lot of trouble switching out of

ASP.NET masterpages: how to insert markup in the head section inside the aspx?

阅读更多关于 ASP.NET masterpages: how to insert markup in the head section inside the aspx?

I know I can access the head section of a page which uses a masterpage programmatically this way (in code behind): This is only an example (I'd like to insert scripts and styles etc.): this.Header.Title = "I just set the page's title"; Is there a simple way to do this in a declarative way on in the aspx file itself ? Sometimes it would be handy to insert a client script or a style declaration or a link to an external resource. You can do this by using content regions in the head , in exactly the same way as you would in the body of the page. eg, In your masterpage: <head> <link type="text/css"

SQLAlchemy declarative syntax with autoload (reflection) in Pylons

阅读更多关于 SQLAlchemy declarative syntax with autoload (reflection) in Pylons

I would like to use autoload to use an existings database. I know how to do it without declarative syntax (model/_ init _.py): def init_model(engine): """Call me before using any of the tables or classes in the model""" t_events = Table('events', Base.metadata, schema='events', autoload=True, autoload_with=engine) orm.mapper(Event, t_events) Session.configure(bind=engine) class Event(object): pass This works fine, but I would like to use declarative syntax: class Event(Base): __tablename__ = 'events' __table_args__ = {'schema': 'events', 'autoload': True} Unfortunately, this way I get:

Dynamically add HTML to ASP.NET page

阅读更多关于 Dynamically add HTML to ASP.NET page

Could someone please advise what the "correct" method is for adding HTML content to an ASP.NET page dynamically? I am aware of the following declarative method. //Declaration <%= MyMethodCall() %> //And in the code behind. protected String MyMethodCall() { return "Test Value"; } Is there a better or best practice way? EDIT: I am building a Galleriffic photo gallery dynamically depending on the images located in a specific folder. Dan Depends what you want to do. For controls/text I normally use a LiteralControl and set the Text property as the HTML I want to add, then this control can be added

Simplest JQuery validation rules example

阅读更多关于 Simplest JQuery validation rules example

问题 The following HTML form successfully utilizes jQuery's form validation, displaying "This field is required" to the right of the form field if left blank, and "Please enter at least 2 characters" if fewer than 2 characters were entered. However, instead of the validation metadata being specified using the class and minlength attributes on the "cname" form input field, I'd like to use jQuery's "rules" API instead, where the rules are specified in the body of the validate function. Thanks in

SQLAlchemy update if unique key exists

阅读更多关于 SQLAlchemy update if unique key exists

问题 I've got a class: class Tag(Base, TimestampMixin): """Tags""" __tablename__ = 'tags' __table_args__ = {'mysql_engine' : 'InnoDB', 'mysql_charset' : 'utf8' } id = Column(Integer(11), autoincrement = True, primary_key = True) tag = Column(String(32), nullable = False, unique = True) cnt = Column(Integer(11), index = True, nullable = False, default = 1) def __init__(self, tag): t = session.query(Tag).filter_by(tag=tag).first() if t: self.cnt = t.cnt+1 self.tag = t.tag else: self.tag = tag def _

How to automatically reflect database to sqlalchemy declarative?

阅读更多关于 How to automatically reflect database to sqlalchemy declarative?

问题 sqlautocode - has issues with many-to-many relations sqlsoup - doesn't support relations elixir - it's note auto-generate Is there something else I could try? 回答1: In theory reflection in sqlalchemy should work for you. In this case I'm using an mssql database with two tables which have a simple Many-to-one relation: "Tests" with fields: id testname author_id (foreign key to the Users table, Users.id field) "Users" with fields: id fullname So the following should reflect the database: from