14、Jess规则编写与管理全解析

Jess规则编写与管理全解析

1. Jess规则基础操作

在Jess中，我们可以进行一系列基础操作来定义和执行规则。以下是一些示例代码：

Jess> (clear) 
TRUE 
Jess> (do-backward-chaining item-number) 
TRUE 
Jess> (do-backward-chaining price) 
TRUE 
Jess> (defrule price-check 
    (do-price-check ?name) 
    (price ?name ?price) 
    => 
    (printout t "Price of " ?name " is " ?price crlf)) 
TRUE 
Jess> (defrule find-price 
    (need-price ?name ?) 
    (item-number ?name ?number) 
    => 
    (bind ?price (fetch-price-from-database ?number))
    (assert (price ?name ?price))) 
TRUE 
Jess> (defrule find-item-number 
    (need-item-number ?name ?) 
    => 
    (bind ?number (fetch-number-from-database ?name)) 
    (assert (item-number ?name ?number))) 
TRUE 
Je