rules

Another simple question : is there any way to tell flex to prefer a rule that matches a short thing over a rule that matches a longer thing ? I can't find any good documentation about that. Here is why I need that : I parse a file for a pseudo language that contains some keywords corresponding to control instructions. I'd like them to be the absolute priority so that they're not parsed as parts of an expression. I actually need this priority thing because I don't have to write a full grammar for my project (that would be totally overkill in my case since I perform structural analysis on the

Closed . This question needs to be more focused. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it focuses on one problem only by editing this post . I am looking to design a system that will essentially need to make decisions based on input. The input will be a person. class Person: def __init__(self, name, age, sex, weight, height, nationality): self.name = name self.age = age self.sex = sex self.weight = weight self.height = height self.nationality = nationality We want to assign each person to a school class based on certain rules.

I'll use a university's library system to explain my use case. Students register in the library system and provide their profile: gender, age, department, previously completed courses, currently registered courses, books already borrowed, etc. Each book in the library system will define some borrowing rules based on students' profile, for example, a textbook for the computer algorithm can only be borrowed by students currently registered with that class; another textbook may only be borrowed by students in the math department; there could also be rules such that students can only borrow 2

I was wondering if there is a way to define hierarchy (not just order of execution) between rules and control the rule execution - i.e. if the parent rule fired then the ones below should not be evaluated etc... Information in this thread is an option but it is essentially IF/THEN/ELSE Is there a different option? thanks I am not sure if I understand your question, but using a combination of Activation Groups and the traditional conflict resolution strategies might achieve what you need. For instance, lets say you have 3 rules, A, B and C. You want to use, lets say, salience to give priority

Should a business rule violation throw an exception? No. It's part of normal conditional-handling logic in the program (and often just a disguised form of user error). It depends on what the business rule is, IMO. I would venture to say "not usually" but I'd view it on a case-by-case basis. I don't think there is any one answer, as different business rules might warrant it while others might not. First, a couple of quotes from chapter 18 of Applied Microsoft .NET Framework Programming (page 402) by Jeffrey Richter : "Another common misconception is that an 'exception' identifies an 'error'."

你在使用vue+elementUI技术栈的时候，有没有碰到表格嵌套表单需求以及需要前台的一个校验？ 这里为大家写了一个demo: 1 <template> 2 <div> 3 < el - form : model = "forms" ref = "forms" : rules = "rules" > 4 < el - table : data = "forms.voList" > 5 < el - table - column 6 label = "商品名称" > 7 < template slot - scope = "scope" > 8 < el - form - item : prop = "'voList.'+scope.$index+'.goodsName'" > 9 < el - input v - model = "scope.row.goodsName" ></ el - input > 10 </ el - form - item > 11 </ template > 12 </ el - table - column > 13 < el - table - column 14 label = "商品编码" > 15 < template slot - scope = "scope" > 16 < el - form - item : prop = "

Currently I store all rules files on the file system (there are lots of versions of them) and load the different versions of them into memory at startup. I would like to change to storing my drools files in a database and was wondering if there is any solution or addon to Drools which facilitates this or should I craft my own? Thanks. Yes, it can be done. All you need is the ability to get InputStream .In my case I use my own JPA class RulePackage to persist rule source as byte[], but you could use direct JDBC connection to access BLOB/CLOB fields in your DB schema. Important thing is to save