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");
});
});
AI 代码解读
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);
}
AI 代码解读
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);
}
AI 代码解读
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);
}
}
AI 代码解读
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);
}
AI 代码解读
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>
AI 代码解读
我们来试验一下。
1.gif
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。
