grails - 闭包中的变量以避免多个 if

Question

对于以下代码块，我需要一个更好的解决方案，更好地满足 DRY 原则。有没有办法将每个闭包中的运算符 <,...,>= 作为变量处理？

def query
    if (wvOp == ' ')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" &&
        referenz =~ "${params['referenz']}" 
    }
    if (wvOp == '<')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" && 
        referenz =~ "${params['referenz']}" &&
        anlagetermin < wiedervorlage
    }
    if (wvOp == '<=')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" &&
        referenz =~ "${params['referenz']}" &&
        anlagetermin <= wiedervorlage
    }
    if (wvOp == '=')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" &&
        referenz =~ "${params['referenz']}" &&
        anlagetermin == wiedervorlage
    }
    if (wvOp == '>')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" &&
        referenz =~ "${params['referenz']}" &&
        anlagetermin > wiedervorlage
    }
    if (wvOp == '>=')
        query = Notiz.where {
        notiztext =~ "${params['notiztext']}" &&
        referenz =~ "${params['referenz']}" &&
        anlagetermin >= wiedervorlage
    }
    query.findAll()

彼得
德国多特蒙德

Answer 1

一种方法是替换您的 where使用基于标准的查询。沿着这些思路:

// translate incoming comparison operator to equivalent criteria method
def opMap = [ '<': 'lt', '<=': 'lte', '=': 'eq', '>': 'gt', '>=': 'gte' ]

def c = Notiz.createCriteria()
def results = c.list {
    and {
        ilike(notiztext, params['notiztext'])
        ilike(referenz, params['referenz'])
        if (wvOp in opMap.keySet()) {
           "${opMap[wvOp]}"(anlagetermin, wiedervorlage)
        }
    }
}