struts实战--实现条件查询(利用dbutils)

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struts实现条件查询---利用dbutils

一.在list.jsp页面修改查询组件

       是否上传简历
       <s:select list="#{'1':'有','2':'无'}" name="isUpload" id="isUpload" headerKey="0" headerValue="--请选择--"></s:select>

<%@ page language="java" pageEncoding="UTF-8"%><%@taglib uri="/struts-tags" prefix="s"%><HTML><HEAD><meta http-equiv="Content-Language" content="zh-cn"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="${pageContext.request.contextPath}/css/Style.css" rel="stylesheet" type="text/css" /><script language="javascript" src="${pageContext.request.contextPath}/js/public.js"></script><script type="text/javascript" src="${pageContext.request.contextPath }/jquery/jquery-1.4.2.js"></script><script type="text/javascript">function addUser(){window.location.href = "${pageContext.request.contextPath}/user/add.jsp";}$(function(){// 为删除链接 加确认效果$(".delLink").click(function(event){var isConfirm = window.confirm("想好了吗？");if(!isConfirm){// 阻止提交event.preventDefault();}});});</script></HEAD><body><br><s:form action="user_list" namespace="/" method="post" theme="simple" id="Form1" name="Form1"><table cellSpacing="1" cellPadding="0" width="100%" align="center" bgColor="#f5fafe" border="0"><TBODY><tr><td class="ta_01" align="center" bgColor="#afd1f3"><strong>查 询 条 件</strong></td></tr><tr><td><table cellpadding="0" cellspacing="0" border="0" width="100%"><tr><td height="22" align="center" bgColor="#f5fafe" class="ta_01">用户姓名</td><td class="ta_01" bgColor="#ffffff"><s:textfield name="userName" size="15" id="Form1_userName" cssClass="bg"/></td><td height="22" align="center" bgColor="#f5fafe" class="ta_01">性别：</td><td class="ta_01" bgColor="#ffffff"><s:select list="{'男','女'}" name="sex" id="sex" headerKey="" headerValue="--选择性别--"></s:select></td></tr><tr><td height="22" align="center" bgColor="#f5fafe" class="ta_01">学历：</td><td class="ta_01" bgColor="#ffffff"><s:select list="{'博士','硕士','研究生','本科','专科','高中'}" name="education" id="education" headerKey="" headerValue="--选择学历--"></s:select></td><td height="22" align="center" bgColor="#f5fafe" class="ta_01">是否上传简历</td><td class="ta_01" bgColor="#ffffff"><s:select list="#{'1':'有','2':'无' }" name="isUpload" id="isUpload" headerKey="" headerValue="--请选择--"></s:select></td></tr><tr><td width="100" height="22" align="center" bgColor="#f5fafe"class="ta_01"></td><td class="ta_01" bgColor="#ffffff"><font face="宋体" color="red">  </font></td><td align="right" bgColor="#ffffff" class="ta_01"><br><br></td><td align="right" bgColor="#ffffff" class="ta_01"><button type="submit" id="search" name="search" value="查询" class="button_view">查询</button>     <input type="reset" name="reset" value="重置" class="button_view"/></td></tr></table></td></tr><tr><td class="ta_01" align="center" bgColor="#afd1f3"><strong>用 户 列 表</strong></TD></tr><tr><td class="ta_01" align="right"><button type="button" id="add" name="add" value="添加" class="button_add" onclick="addUser()">添加</button></td></tr><tr><td class="ta_01" align="center" bgColor="#f5fafe"><table cellspacing="0" cellpadding="1" rules="all"bordercolor="gray" border="1" id="DataGrid1"style="BORDER-RIGHT: gray 1px solid; BORDER-TOP: gray 1px solid; BORDER-LEFT: gray 1px solid; WIDTH: 100%; WORD-BREAK: break-all; BORDER-BOTTOM: gray 1px solid; BORDER-COLLAPSE: collapse; BACKGROUND-COLOR: #f5fafe; WORD-WRAP: break-word"><trstyle="FONT-WEIGHT: bold; FONT-SIZE: 12pt; HEIGHT: 25px; BACKGROUND-COLOR: #afd1f3"><td align="center" width="18%">登录名</td><td align="center" width="17%">用户姓名</td><td align="center" width="8%">性别</td><td align="center" width="23%">联系电话</td><td width="11%" align="center">学历</td><td width="7%" align="center">编辑</td><td width="7%" align="center">查看</td><td width="7%" align="center">删除</td></tr><s:iterator value="users" var="user"><tr onmouseover="this.style.backgroundColor = 'white'"onmouseout="this.style.backgroundColor = '#F5FAFE';"><td style="CURSOR: hand; HEIGHT: 22px" align="center"width="18%"><!-- user会push到root 同时 保存contextMap --><s:property value="logonName"/><s:property value="#user.logonName"/></td><td style="CURSOR: hand; HEIGHT: 22px" align="center"width="17%"><s:property value="#user.userName"/></td><td style="CURSOR: hand; HEIGHT: 22px" align="center"width="8%"><s:property value="#user.sex"/></td><td style="CURSOR: hand; HEIGHT: 22px" align="center"width="23%"><s:property value="#user.telephone"/></td><td style="CURSOR: hand; HEIGHT: 22px" align="center"><s:property value="#user.education"/></td><td align="center" style="HEIGHT: 22px"><s:a action="user_editview" namespace="/"><s:param name="userID" value="#user.userID"></s:param><img src="${pageContext.request.contextPath}/images/i_edit.gif" border="0" style="CURSOR: hand"></s:a></td><td align="center" style="HEIGHT: 22px"><s:a action="user_view" namespace="/"><s:param name="userID" value="#user.userID"></s:param><img src="${pageContext.request.contextPath}/images/button_view.gif" border="0" style="CURSOR: hand"></s:a></td><td align="center" style="HEIGHT: 22px"><s:a action="user_delete" namespace="/" cssClass="delLink"><s:param name="userID" value="#user.userID"></s:param><img src="${pageContext.request.contextPath}/images/i_del.gif" width="16" height="16" border="0" style="CURSOR: hand"></s:a></td></tr></s:iterator></table></td></tr></TBODY></table></s:form></body></HTML>

二.添加校验

三.完成条件查询操作
       1、是否上传简历，怎样在action中获取？

需要在User中添加一个属性 String isUpload

2、在dao中怎样根据条件查询?

在这里dao层我们使用的是dbutils，所以进行条件查询的时候需要用到QueryRunner类，而他的查询方法queryRunner.query(sql,
new BeanListHandler<User>(User.class), argList.toArray());需要sql语句，和所有参数的这两个参数，所以我们需要解决这两个问题。

           1）.sql语句生成

           2）.参数怎样传递?
               创建一个List<Object>,在每一次判断时，直接将参数添加到集合中，
               最后将集合转换成Object[]，做为参数传递到query方法中。

  String sql = "select * from s_user where 1=1 ";                List<Object> params=new ArrayList<Object>();                String username = user.getUserName();                if (username != null && username.trim().length() > 0) {                    sql += " and userName like ?";                    params.add("%"+username+"%");                }                String sex = user.getSex();                if (sex != null && sex.trim().length() > 0) {                    sql += " and sex=?";                    params.add(sex);                }                String education = user.getEducation();                if (education != null && education.trim().length() > 0) {                    sql += " and education=?";                    params.add(education);                }                String isupload = user.getIsUpload();                if ("1".equals(isupload)) {                    sql += " and filename is not null";                } else if ("2".equals(isupload)) {                    sql += " and filename is null";                }                QueryRunner runner = new QueryRunner(DataSourceUtils.getDataSource());                return runner.query(sql, new BeanListHandler<User>(User.class),params.toArray());

/** * 条件查询 *  * @param user * @return */public List<User> findByCondition(User user) {// 根据用户姓名、性别、学历、是否上传简历 组合查询String sql = "select * from s_user where 1=1 ";List<String> argList = new ArrayList<String>(); // 参数列表if (user.getUserName() != null&& user.getUserName().trim().length() > 0) {sql += "and userName like ? ";argList.add("%" + user.getUserName() + "%");}if (user.getSex() != null && user.getSex().trim().length() > 0) {sql += "and sex = ? ";argList.add(user.getSex());}if (user.getEducation() != null&& user.getEducation().trim().length() > 0) {sql += "and education = ? ";argList.add(user.getEducation());}if (user.getIsUpload() != null&& user.getIsUpload().trim().length() > 0) {if (user.getIsUpload().equals("1")) {// 上传简历sql += "and filename is not null";} else if (user.getIsUpload().equals("2")) {// 没有上传简历sql += "and filename is null";}}try {List<User> users = queryRunner.query(sql,new BeanListHandler<User>(User.class), argList.toArray());return users;} catch (SQLException e) {e.printStackTrace();throw new MySQLException(e);}}

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