内容简介：struts实战--实现条件查询(利用dbutils)
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">
<tr
style="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
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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