SSM+maven实现答题管理系统（二）

好的，现在我们来实现删除模板(model表删除记录)的功能，删除功能不难做，主要我们这次实现的是批量删除功能。

一.思路整理

首先我们删除模板是根据模板的id来删除的，不管是单项删除还是批量删除，我们这里使用layui获取当前行的功能就能获取模板的id

其次不管单项删除还是批量删除，只要将id放入数组中，后端对数组进行遍历，就能达到单项删除/批量删除

二.代码实现

思路实现以后，我们上代码。

View层:

 var id_array = []; //获取选中行 // 获取选中行 这里我们可以选择删除 这里的id_array是一个隐藏的值 device对应device_id user对应code survry对应model_id table.on('checkbox(test)', function(obj) { //监听复选框 if (obj.type == 'all') { if (obj.checked == true) { var data = table.cache.dataCheck; //批量操作的表格复选框 id_array = []; for (var l = 0; l < data.length; l++) { id_array.push(data[l].model_id); } console.log(id_array); } else { id_array = []; } } else { if (obj.checked == true) { id_array.push(obj.data.model_id); console.log(id_array); } else { var index = id_array.indexOf(obj.data.model_id); id_array.splice(index, 1); console.log(id_array); } } }); $('#btn-delete-all').click(function() { //删除全部通过一个获取选中行的值，来删除 layer.confirm('您确定要删除这些数据吗？', function(index) { //打开正在加载中弹出层 layer.msg('加载中', { icon: 16, shade: 0.01, time: '9999999' }); var url = "survey/del_model"; var data = { model_id: id_array //这里将当前的model_id传到后端 } $.post(url, data, function(data) { layer.close(layer.index); //关闭正在加载中弹出层 console.log(id_array); if (data.code == 1) { layer.msg(data.msg, { icon: 6 }); location.reload(); } else { layer.msg(data.msg, { icon: 5 }); } }, "json"); }); }); 

首先对数据表格进行监听，如果数据表格的当前行被选中，则往id_array数组中push一个id，有多少个，push多少个，而后我们将数组用ajax上传，键名为model_id.

Controller层:

 //返回数据用responseBody //删除model @RequestMapping(value="Index/survey/del_model") @ResponseBody public Map<String,Object> delModel(HttpServletRequest req) throws IOException { String[] arr = req.getParameterValues("model_id[]");//前端传来的modelId int code; String msg; // if(arr!=null) // return api.returnJson(3,arr[0]); for (int i = 0; i < arr.length; i++) { List<Choose> is_answer=chooseService.findChooseByModelId(arr[i]); if (!is_answer.isEmpty()) { return api.returnJson(3,"抱歉，题目已经被作答，无法删除"); } continue; } //如果没有 那么当前选中模板的题目都没有被答过 作级联删除 删除模板表 删除题目表 删除选项表(根据model查出Qsn 再根据qsnId删除Option) int is_del=modelService.deleteModelByIds(arr);//删除模板表 for (int i = 0; i <arr.length ; i++) { int is_del_qsn=qsnService.deleteModel2Qsn(arr[i]);//删除题目表 List<Qsn> qsnList=qsnService.findQsnList(arr[i]);//得到题目 System.out.println(qsnList); for (int j = 0; j <qsnList.size() ; j++) {//删除选项表 int isDelOptions=detailService.deleteOptionsByQsnId(qsnList.get(j).getQsnId()); } } //先查询模板下的题目list 然后遍历list，根据item.id 即qsnId来删除 // String[] is_del_option 还缺删除选项表的逻辑 if (is_del!=0){ code=1; msg="success"; }else { code=2; msg="fail"; } return api.returnJson(code,msg); } 

这里进行说明一下，区别于tp5，我们使用httpservlet.request的getParameterValues()方法来获取前端传入的array数组

Service层:
modelService：

package com.sl.example.service; import com.sl.example.pojo.Model; import java.util.List; public interface ModelService { public List<Model> findAllModel(); public int deleteModelById(String modelId); public int deleteModelByIds(String[] arr); public int InsertModel(Model model); public Model selectModelById(String modelId); } 

modelServiceImpl：

package com.sl.example.service; import com.sl.example.dao.ModelMapper; import com.sl.example.pojo.Model; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import javax.annotation.Resource; import java.util.List; @Service("modelService") @Transactional public class ModelServiceImpl implements ModelService{ @Resource private ModelMapper modelMapper; @Override public List<Model> findAllModel() { return modelMapper.selectAllModel(); } @Override public int deleteModelById(String modelId) { return modelMapper.deleteByPrimaryKey(modelId); } @Override public int deleteModelByIds(String[] arr) { return modelMapper.deleteByIds(arr); } @Override public int InsertModel(Model model) { return modelMapper.insertSelective(model); } @Override public Model selectModelById(String modelId) { return modelMapper.selectByPrimaryKey(modelId); } } 

将DAO层也贴出来:

package com.sl.example.dao; import com.sl.example.pojo.Model; import java.util.List; public interface ModelMapper { int deleteByPrimaryKey(String modelId); int deleteByIds(String[] list); int insert(Model record); int insertSelective(Model record); Model selectByPrimaryKey(String modelId); List<Model> selectAllModel(); int updateByPrimaryKeySelective(Model record); int updateByPrimaryKey(Model record); } 

对应的ModelMapper.xml:

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.sl.example.dao.ModelMapper" > <resultMap id="BaseResultMap" type="com.sl.example.pojo.Model" > <constructor > <idArg column="model_id" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="name" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="time" jdbcType="DATE" javaType="java.util.Date" /> <arg column="create_name" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="rmk2" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="rmk3" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="rmk4" jdbcType="VARCHAR" javaType="java.lang.String" /> <arg column="rmk5" jdbcType="VARCHAR" javaType="java.lang.String" /> </constructor> </resultMap> <sql id="Base_Column_List" > model_id, name, time, create_name, rmk2, rmk3, rmk4, rmk5 </sql> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" > select <include refid="Base_Column_List" /> from t_gr_qsn_model where model_id = #{modelId,jdbcType=VARCHAR} </select> <select id="selectAllModel" resultMap="BaseResultMap" resultType="java.util.List"> select <include refid="Base_Column_List" /> from t_gr_qsn_model </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.String" > delete from t_gr_qsn_model where model_id = #{modelId,jdbcType=VARCHAR} </delete> <delete id="deleteByIds" parameterType="java.util.Arrays"> delete from t_gr_qsn_model where model_id in <foreach collection="array" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </delete> <insert id="insert" parameterType="com.sl.example.pojo.Model" > insert into t_gr_qsn_model (model_id, name, time, create_name, rmk2, rmk3, rmk4, rmk5) values (#{modelId,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}, #{time,jdbcType=DATE}, #{createName,jdbcType=VARCHAR}, #{rmk2,jdbcType=VARCHAR}, #{rmk3,jdbcType=VARCHAR}, #{rmk4,jdbcType=VARCHAR}, #{rmk5,jdbcType=VARCHAR}) </insert> <insert id="insertSelective" parameterType="com.sl.example.pojo.Model" > insert into t_gr_qsn_model <trim prefix="(" suffix=")" suffixOverrides="," > <if test="modelId != null" > model_id, </if> <if test="name != null" > name, </if> <if test="time != null" > time, </if> <if test="createName != null" > create_name, </if> <if test="rmk2 != null" > rmk2, </if> <if test="rmk3 != null" > rmk3, </if> <if test="rmk4 != null" > rmk4, </if> <if test="rmk5 != null" > rmk5, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="modelId != null" > #{modelId,jdbcType=VARCHAR}, </if> <if test="name != null" > #{name,jdbcType=VARCHAR}, </if> <if test="time != null" > #{time,jdbcType=DATE}, </if> <if test="createName != null" > #{createName,jdbcType=VARCHAR}, </if> <if test="rmk2 != null" > #{rmk2,jdbcType=VARCHAR}, </if> <if test="rmk3 != null" > #{rmk3,jdbcType=VARCHAR}, </if> <if test="rmk4 != null" > #{rmk4,jdbcType=VARCHAR}, </if> <if test="rmk5 != null" > #{rmk5,jdbcType=VARCHAR}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.sl.example.pojo.Model" > update t_gr_qsn_model <set > <if test="name != null" > name = #{name,jdbcType=VARCHAR}, </if> <if test="time != null" > time = #{time,jdbcType=DATE}, </if> <if test="createName != null" > create_name = #{createName,jdbcType=VARCHAR}, </if> <if test="rmk2 != null" > rmk2 = #{rmk2,jdbcType=VARCHAR}, </if> <if test="rmk3 != null" > rmk3 = #{rmk3,jdbcType=VARCHAR}, </if> <if test="rmk4 != null" > rmk4 = #{rmk4,jdbcType=VARCHAR}, </if> <if test="rmk5 != null" > rmk5 = #{rmk5,jdbcType=VARCHAR}, </if> </set> where model_id = #{modelId,jdbcType=VARCHAR} </update> <update id="updateByPrimaryKey" parameterType="com.sl.example.pojo.Model" > update t_gr_qsn_model set name = #{name,jdbcType=VARCHAR}, time = #{time,jdbcType=DATE}, create_name = #{createName,jdbcType=VARCHAR}, rmk2 = #{rmk2,jdbcType=VARCHAR}, rmk3 = #{rmk3,jdbcType=VARCHAR}, rmk4 = #{rmk4,jdbcType=VARCHAR}, rmk5 = #{rmk5,jdbcType=VARCHAR} where model_id = #{modelId,jdbcType=VARCHAR} </update> </mapper> 

我们来试验一下。

成功啦，下一节我们讲对应某一套题目模板下的题目的增删。