Hibernate--使用离线查询DetachedCriteria完成对列表的筛选

系统管理员 2021-08-14 01:06 360阅读 0赞

#### User表： ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]

#### User类： ####

package pers.zhang.domain;
    
    public class User { 
    	
    	private Long user_id;
    	private String user_code;
    	private String user_name;
    	private String user_password;
    	private String user_state;
    	public Long getUser_id() { 
    		return user_id;
    	}
    	public void setUser_id(Long user_id) { 
    		this.user_id = user_id;
    	}
    	public String getUser_code() { 
    		return user_code;
    	}
    	public void setUser_code(String user_code) { 
    		this.user_code = user_code;
    	}
    	public String getUser_name() { 
    		return user_name;
    	}
    	public void setUser_name(String user_name) { 
    		this.user_name = user_name;
    	}
    	public String getUser_password() { 
    		return user_password;
    	}
    	public void setUser_password(String user_password) { 
    		this.user_password = user_password;
    	}
    	public String getUser_state() { 
    		return user_state;
    	}
    	public void setUser_state(String user_state) { 
    		this.user_state = user_state;
    	}
    }

#### ORM元数据： ####

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    <hibernate-mapping package="pers.zhang.domain" >
    	<class name="User" table="sys_user" >
    		<id name="user_id" >
    			<generator class="identity"></generator>
    		</id>
    		<property name="user_code" column="user_code" ></property>
    		<property name="user_name" column="user_name" ></property>
    		<property name="user_password" column="user_password" ></property>
    		<property name="user_state" column="user_state" ></property>
    	</class>
    </hibernate-mapping>

#### 控制层： ####

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    		request.setCharacterEncoding("utf-8");
    		//获得查询参数
    		String userIdStr = request.getParameter("userId");
    		String userName = request.getParameter("userName");
    		//获得离线查询对象
    		DetachedCriteria detachedCriteria = DetachedCriteria.forClass(User.class);
    		//拼装查询条件
    		if(userIdStr != null && !"".equals(userIdStr)) { 
    			Long userId = (long) Integer.parseInt(userIdStr);
    			detachedCriteria.add(Restrictions.eq("user_id", userId));
    		}
    		if(userName != null && !"".equals(userName)) { 
    			detachedCriteria.add(Restrictions.like("user_name", userName, MatchMode.ANYWHERE));
    		}
    		
    		//作为参数传递给service层
    		UserService userService = new UserService();
    		List<User> list = userService.findUserByCondition(detachedCriteria);
    		
    		request.setAttribute("userList", list);
    		request.getRequestDispatcher("list2.jsp").forward(request, response);
    	}

#### Service层： ####

public List<User> findUserByCondition(DetachedCriteria detachedCriteria) { 
    		//传递给Dao层
    		UserDao userDao = new UserDao();
    		return userDao.findUserByCondition(detachedCriteria);
    	}

#### Dao层： ####

public List<User> findUserByCondition(DetachedCriteria detachedCriteria) { 
    		Session session = HibernateUtils.openSession();
    		Transaction tx = session.beginTransaction();
    		
    		//关联session
    		Criteria criteria = detachedCriteria.getExecutableCriteria(session);
    		//查询
    		List<User> list = criteria.list();
    		return list;
    		
    	}

#### 前端页面： ####

忘记写查询数据回显了…

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
    <!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title></title>
    		<script type="text/javascript" src="js/jquery-2.1.0.js" ></script>
    		<script type="text/javascript" src="js/bootstrap.min.js" ></script>
    		<link rel="stylesheet" href="css/bootstrap.css" />
    	</head>
    	<body>
    		<form class="form-inline" role="form" method="post" action="${pageContext.request.contextPath }/findUserByCondition">
    		  <div class="form-group">
    		    <input type="text" class="form-control" id="exampleInputEmail2" placeholder="用户ID" name="userId">
    		  </div>
    		  <div class="form-group">
    		    <input type="text" class="form-control" id="exampleInputPassword2" placeholder="用户名" name="userName">
    		  </div>
    		  <button type="submit" class="btn btn-default">筛选</button>
    		</form>
    	
    		<div style="text-align: center; width: 600px;">
    		<table class="table table-hover">
    		  <tr><td>编号</td><td>用戶ID</td><td>用户名</td><td>昵称</td><td>密码</td></tr>
    		  
    		  <c:forEach items="${userList }" var="list">
    		  	<tr><td>${list.user_id }</td><td>${list.user_code }</td><td>${list.user_name }</td><td>${list.user_password }</td><td>${list.user_state }</td></tr>
    		  </c:forEach>
    		</table>
    	</div>
    
    
    	</body>
    </html>

#### 测试： ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 1]

![在这里插入图片描述][2019100617503483.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][20191006175222796.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]: /images/20210813/f3ff9fe29b1a4a2c80af17b561f1cd29.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 1]: /images/20210813/b1f66728aa0e462e8633fefb0741be73.png
[2019100617503483.png]: /images/20210813/49a6dfd2cf5f49bda21dcf0f5d52693f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 2]: /images/20210813/fa56861bdd0b471fa5c596bfe088c23c.png
[20191006175222796.png]: /images/20210813/f06c25b9a0df47478d8ee053a6f2ab71.png