基于SSM框架下的模糊查询

1、数据表设计

2、数据表里增添四个字段：

3创建接口

List<Qualification> findAll();//查询所有，把Qualification的所有属性封装到List里

List<Qualification> findByName(String name);//根据name字段里的任意一个值进行模糊查询整条记录

4、在mybatis 里编写sql语句

select id="findByName" parameterType="String" resultMap="BaseResultMap">
       select * from qualification where name like "%"#{name}"%" //注释的表示也可以再添加一个字段，通过两个字段进行模糊查询。
   
</select>

5、业务逻辑层代码实现

package com.lysoc.jmi.tracing.service.user;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.lysoc.jmi.tracing.mapper.QualificationMapper;
import com.lysoc.jmi.tracing.model.Qualification;

@Service
public class QuaService {

   @Autowired//注入mapper,操做数据库的，相当于dao层，
   QualificationMapper qualificationMapper;

   public List<Qualification> findByName(String name) {

       return qualificationMapper.findByName(name) ;//返回服务层到控制层
   }

}

6、编写Qualification类的实体类

public class Qualification {
   public Integer getId() {
       return id;
   }
   public void setId(Integer id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getDescription() {
       return description;
   }
   public void setDescription(String description) {
       this.description = description;
   }
   public String getClassification() {
       return classification;
   }
   public void setClassification(String classification) {
       this.classification = classification;
   }
   private Integer id;
   private String name;
   private String description;
   private String classification;

}

7、首先要查询出所有的记录

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.lysoc.jmi.tracing.mapper.QualificationMapper;
import com.lysoc.jmi.tracing.model.Qualification;
import com.lysoc.jmi.tracing.service.user.QuaService;

@Controller
public class QualificationController {
       @Autowired
       private QualificationMapper qualificationMapper;//加入dao层和服务层都要注入一个@Autowired，否则会报空指针异常。

       @Autowired
       private QuaService quaService;

       @RequestMapping("/findAll")
       public ModelAndView findAll(HttpServletRequest request) {
           List<Qualification> list=qualificationMapper.findAll();//查询所有的记录
           for(Qualification q:list) {//进行遍历
               request.getSession().setAttribute("q", list);//封装到request对象里。
           }
           return new ModelAndView("qualification_main");//返回视图，

       }

       @RequestMapping("/findByName")//模糊查询
       public String findByName (HttpServletRequest request,Map<String,Object> map) {
           String name=request.getParameter("name");
           System.out.println(name);
           System.out.println(name);
           List<Qualification> list=quaService.findByName(name);
           System.out.println("成功");
           map.put("q", list);
           return ("qualification_main");//返回到这个jsp页面
       }

}

8、在qualification.jsp里进行打印显示。

<body>

<form action="${path}/findByName" method="post">
<input type="text" name="name">
<input type="submit" value="查询">
</form>//一个表单查询

<table id="form">
   <tr><th><th>序号</th><th>类别</th><th>名称</th><th>描述</th><th>操作</th></tr>
   <c:forEach items="${q}" var="qua">
   <tr>
       <td><input type="checkbox"/></td>
       <td>${qua.id}</td>
       <td>${qua.classification}</td>
       <td>${qua.name} </td>
       <td>${qua.description}</td>
       <td>
           <a href="updateFirmTo?id=${qua.id}"><button id="btn2">更改</button></a>
           <a href="deleteFirm?id=${qua.id}"><button id="btn2">删除</button></a>
       </td>

   </tr>

   </c:forEach>

</table>

</body>

效果图

模糊查询成功

需要源码的话，可以发评论告诉我哦。

基于SSM框架下的模糊查询

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