def search = {

        if(!params.max) params.max = 10         if(!params.offset) params.offset = 0         def searchClosure =  {             if(params.categoryName) {                 category{                     eq('categoryName', params.categoryName);                 }             }             if(params.title) {                 like('title',"%${params.title}")             }             if(params.priceLow) {                 ge('price', new BigDecimal(params.priceLow))             }             if(params.priceHigh) {                 le('price', new BigDecimal(params.priceHigh))             }             if(params.description) {                 like('description', "%${params.description}")             }         }         def c = Goods.createCriteria();         params.sort = "price"         params.order = "asc"         def goodList = c.list (params, searchClosure) //        def goodsCount = c.count (searchClosure)         def goodsCount = goodList.totalCount         println goodsCount         render (view: 'list', model: [goodsInstanceList: goodList, goodsInstanceTotal: goodsCount])     }

使用闭包封装查询条件如上面的searchClosure闭包，这样就可以重复使用查询条件了，

在list的时候会返回一个PagedResultList类型，里面就有totalCount属性，表示符合查询条件的记录数，这样就不用count了。在list的时候可以传入分页参数组成的map如上面的params参数，这样就不用在查询闭包里设置分页参数了