grails多条件搜索功能实现1

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以GDepot为例:

1.创建搜索页面(searchForm.gsp):

代码如下:

<%@ page import="gdepot.Goods" %>
<!DOCTYPE html>
<html>
<head>
<meta name="layout" content="main">
<g:set var="entityName" value="${message(code: 'goods.label', default: 'Goods')}" />
<title>Search goods</title>
</head>
<body>
<a href="#edit-goods" class="skip" tabindex="-1"><g:message code="default.link.skip.label" default="Skip to content&hellip;"/></a>
<div class="nav" role="navigation">
<ul>
<li><a class="home" href="${createLink(uri: '/')}"><g:message code="default.home.label"/></a></li>
<li><g:link class="list" action="index"><g:message code="default.list.label" args="[entityName]" /></g:link></li>

</ul>
</div>
<div id="edit-goods" class="content scaffold-edit" role="main">
<g:form method="get" action="search">

<div class="fieldcontain  required">
<label for="category">
Category:</label>
<g:select optionKey="categoryName" optionValue="categoryName" from="${gdepot.Category.list()}"name="categoryName" noSelection="${['':'']}"/></br>

</div>

<div class="fieldcontain  required">
<label for="category">

 Title:</label>
 <input type="text" id="title" name="title"/>
  </div>

 <div class="fieldcontain  required">
<label for="category">
  Description:</label>
 <textarea id="description" name="description" ></textarea>
                                    </div>
         <div class="fieldcontain  required">

 <label for="category"> Price:</label> <input type="text" id="priceLow" name="priceLow"/>

 to:     <input type="text" id="priceHigh" name="priceHigh"/>
                                   </div>
  <fieldset class="buttons">
<g:actionSubmit class="save" action="search" value="Search" />
</fieldset>
</g:form>
</div>
</body>
</html>

第二步:找到 GoodsController.groovy文件

   添加一个空方法:def  searchForm(){};或者空的闭包:def searchForm={}

第三步:添加一个闭包或者方法(def search={})方法名要和搜索页面form的action一致(如上红色加下划线处)

代码如下:

def  search={
       if(!params.max)params.max=4  //这里的params.max=4是指一业所要显示的最多个数,此处为每页显示4条信息
    
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()
def goodsList=c.list(params,searchClosure)//此处有两个参数,意思是第一个:一次查询的个数,第二个是提交上来的查询条件

def goodsCount=Goods.count               //求满足条件的记录数

render(view:'index',model:[goodsInstanceList:goodsList,goodsInstanceCount:goodsCount])//发送到view页面,且同时发送两个参数过去
    }

view(index.gsp)页面代码如下:

<%@ page import="gdepot.Goods" %>
<!DOCTYPE html>
<html>
<head>
<meta name="layout" content="main">
<g:set var="entityName" value="${message(code: 'goods.label', default: 'Goods')}" />
<title><g:message code="default.list.label" args="[entityName]" /></title>
</head>
<body>
<a href="#list-goods" class="skip" tabindex="-1"><g:message code="default.link.skip.label" default="Skip to content&hellip;"/></a>
<div class="nav" role="navigation">
<ul>
<li><a class="home" href="${createLink(uri: '/')}"><g:message code="default.home.label"/></a></li>
<li><g:link class="create" action="create"><g:message code="default.new.label" args="[entityName]" /></g:link></li>
<li><g:link class="search" action="searchForm">Search Goods</g:link></li>

</ul>
</div>
<div id="list-goods" class="content scaffold-list" role="main">
<h1><g:message code="default.list.label" args="[entityName]" /></h1>
<g:if test="${flash.message}">
<div class="message" role="status">${flash.message}</div>
</g:if>
<table>
<thead>
<tr>

<th><g:message code="goods.title.label" default="Title" /></th>

<g:sortableColumn property="desciption" title="${message(code:'goods.description.label',default:'Description')}"/>

<g:sortableColumn property="photoUrl" title="${message(code: 'goods.photoUrl.label', default: 'Photo Url')}" />

<g:sortableColumn property="price" title="${message(code: 'goods.price.label', default: 'Price')}" />
       
<g:sortableColumn property="category" title="${message(code: 'goods.category.label', default: 'Category')}" />

</tr>
</thead>
<tbody>
<g:each in="${goodsInstanceList}" status="i" var="goodsInstance">
<tr class="${(i % 2) == 0 ? 'even' : 'odd'}">

<td><g:link action="show" id="${goodsInstance.id}">${fieldValue(bean: goodsInstance, field: "title")}</g:link></td>

<td>${fieldValue(bean: goodsInstance, field: "description")}</td>

<td><img src='${resource(dir:"images/myimage",file:"${goodsInstance.photoUrl}")}'/></td>

<td>${fieldValue(bean: goodsInstance, field: "price")}</td>

<td>${fieldValue(bean: goodsInstance, field: "category")}</td>

</tr>
</g:each>
</tbody>
</table>
<div class="pagination">
<g:paginate total="${goodsInstanceCount ?: 0}" />//分页设置
</div>
</div>
</body>
</html>


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