黑马程序员Java Web--14.综合案例--修改功能实现
一、BrandMapper包
首先，在BrandMapper包中定义用来修改的方法，和使用注解的sql语句。
BrandMapper包所在路径：
package com.itheima.mapper;
/**
*
* 修改
*
**/
@Update("update tb_brand set brand_name = #{brandName},company_name = #{companyName},ordered = #{ordered},description = #{description},status = #{status} where id = #{id}")
void upDate(Brand brand);
二、BrandService
BrandService中定义一个提供修改的方法接口，用来给BrandServiceImpl进行具体方法的实现。
BrandService包所在路径：
package com.itheima.service;
void upDate(Brand brand);
三、BrandServiceImpl
在BrandServiceImpl重写BrandService接口中提供的upDate方法。
BrandServiceImpl包所在路径：
package com.itheima.service.impl;
@Override
public void upDate(Brand brand){
//2.获取sqlsession对象
SqlSession sqlSession = factory.openSession();
//3.获取Mapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//调用upDate方法
mapper.upDate(brand);
//sql事务提交
sqlSession.commit();
//关闭sql
sqlSession.close();
}
四、BrandServlet
在BrandServlet中实现upDate Servlet的功能。
BrandServlet路径：
package com.itheima.web.servlet;
public void upDate(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1. 接收品牌数据
BufferedReader br = request.getReader();
String params = br.readLine();//json字符串
System.out.println("par:"+params);
//转为Brand对象
Brand brand = JSON.parseObject(params, Brand.class);
System.out.println("brand:"+brand);
//2. 调用service添加
brandService.upDate(brand);
//3. 设置编码方式
response.setContentType("text/json;charset=utf-8");
//4. 响应成功的标识
response.getWriter().write("success");
}
五、前端代码
首先，添加一个修改数据的表单。这段代码位置可以放在网页数据表单的上方。
<el-dialog
title="修改品牌"
:visible.sync="updateDialogVisible"
width="30%"
>
<el-form ref="form" :model="brand" label-width="80px">
<el-input v-model="brand.id" type="hidden">el-input>
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName">el-input>
el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName">el-input>
el-form-item>
<el-form-item label="排序">
<el-input v-model="brand.ordered">el-input>
el-form-item>
<el-form-item label="备注">
<el-input type="textarea" v-model="brand.description">el-input>
el-form-item>
<el-form-item label="状态">
<el-switch v-model="brand.status"
active-value="1"
inactive-value="0"
>el-switch>
el-form-item>
<el-form-item>
<el-button type="primary" @click="edit">提交el-button>
<el-button @click="updateDialogVisible = false">取消el-button>
el-form-item>
el-form>
el-dialog>
这段代码中定义了一个判定是否显示表单的变量：updateDialogVisible
我们需要在script中的data中进行定义：
data(){
return{
updateDialogVisible: false,
}
}
在你自己项目中只复制updateDialogVisible: false, 就可以了。
在methods里面添加如下方法
//修改
updateBrand(index,row){
this.brand.id=row.id;
this.updateDialogVisible=true;
this.brand = JSON.parse(JSON.stringify(row));
},
edit(){
var _this=this;
axios({
method:"post",
url:"http://localhost:8098/brand-case/brand/upDate",
data:_this.brand
}).then(response =>{
if (response.data == "success") {
//添加成功
_this.updateDialogVisible = false
//刷新
_this.selectAll();
_this.$message({
message: '修改成功',
type: 'success'
});
}
})
},
其中updateBrand函数是我们点击修改按钮时绑定的click方法
在网页显示数据的表单代码段中，找到修改button所在位置，给@click添加点击事件的函数updateBrand。
以及这里需要获取表单中某行的id值用来获得需要修改行现有的值，所以使用:slot-scope
(ps:这段代码直接复制替换原来修改删除的位置就好)
<template slot-scope="scope">
<el-row>
<el-button type="primary" @click="updateBrand(scope.$index,scope.row)">修改</el-button>
<el-button type="danger">删除</el-button>
</el-row>
</template>
六、brand.html 全部代码展示：
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Titletitle>
<style>
.el-table .warning-row {
background: oldlace;
}
.el-table .success-row {
background: #f0f9eb;
}
style>
head>
<body>
<div id="app">
<el-form :inline="true" :model="brand" class="demo-form-inline">
<el-form-item label="当前状态">
<el-select v-model="brand.status" placeholder="当前状态">
<el-option label="启用" value="1">el-option>
<el-option label="禁用" value="0">el-option>
el-select>
el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName" placeholder="企业名称">el-input>
el-form-item>
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName" placeholder="品牌名称">el-input>
el-form-item>
<el-form-item>
<el-button type="primary" @click="onSubmit">查询el-button>
el-form-item>
el-form>
<el-row>
<el-button type="danger" plain @click="deleteByIds">批量删除el-button>
<el-button type="primary" plain @click="dialogVisible = true">新增el-button>
el-row>
<el-dialog
title="编辑品牌"
:visible.sync="dialogVisible"
width="30%"
>
<el-form ref="form" :model="brand" label-width="80px">
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName">el-input>
el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName">el-input>
el-form-item>
<el-form-item label="排序">
<el-input v-model="brand.ordered">el-input>
el-form-item>
<el-form-item label="备注">
<el-input type="textarea" v-model="brand.description">el-input>
el-form-item>
<el-form-item label="状态">
<el-switch v-model="brand.status"
active-value="1"
inactive-value="0"
>el-switch>
el-form-item>
<el-form-item>
<el-button type="primary" @click="addBrand">提交el-button>
<el-button @click="dialogVisible = false">取消el-button>
el-form-item>
el-form>
el-dialog>
<el-dialog
title="修改品牌"
:visible.sync="updateDialogVisible"
width="30%"
>
<el-form ref="form" :model="brand" label-width="80px">
<el-input v-model="brand.id" type="hidden">el-input>
<el-form-item label="品牌名称">
<el-input v-model="brand.brandName">el-input>
el-form-item>
<el-form-item label="企业名称">
<el-input v-model="brand.companyName">el-input>
el-form-item>
<el-form-item label="排序">
<el-input v-model="brand.ordered">el-input>
el-form-item>
<el-form-item label="备注">
<el-input type="textarea" v-model="brand.description">el-input>
el-form-item>
<el-form-item label="状态">
<el-switch v-model="brand.status"
active-value="1"
inactive-value="0"
>el-switch>
el-form-item>
<el-form-item>
<el-button type="primary" @click="edit">提交el-button>
<el-button @click="updateDialogVisible = false">取消el-button>
el-form-item>
el-form>
el-dialog>
<template>
<el-table
:data="tableData"
style="width: 100%"
:row-class-name="tableRowClassName"
@selection-change="handleSelectionChange"
>
<el-table-column
type="selection"
width="55">
el-table-column>
<el-table-column
type="index"
width="50">
el-table-column>
<el-table-column
prop="brandName"
label="品牌名称"
align="center"
>
el-table-column>
<el-table-column
prop="companyName"
label="企业名称"
align="center"
>
el-table-column>
<el-table-column
prop="ordered"
align="center"
label="排序">
el-table-column>
<el-table-column
prop="status"
align="center"
label="当前状态">
el-table-column>
<el-table-column
align="center"
label="操作"
>
<template slot-scope="scope">
<el-row>
<el-button type="primary" @click="updateBrand(scope.$index,scope.row)">修改el-button>
<el-button type="danger">删除el-button>
el-row>
template>
el-table-column>
el-table>
template>
<el-pagination
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page="currentPage"
:page-sizes="[5, 10, 15, 20]"
:page-size="5"
layout="total, sizes, prev, pager, next, jumper"
:total="400">
el-pagination>
div>
<script src="js/vue.js">script>
<script src="element-ui/lib/index.js">script>
<script src="js/axios-0.18.0.js">script>
<link rel="stylesheet" href="element-ui/lib/theme-chalk/index.css">
<script>
new Vue({
el: "#app",
mounted() {
this.selectAll()
},
methods: {
selectAll() {
//页面加载完成后，获取数据
var _this = this;
axios({
method: "get",
url: "http://localhost:8098/brand-case/brand/selectAll",
}).then(response => {
this.tableData = response.data;
console.log(_this.tableData)
})
},
tableRowClassName({row, rowIndex}) {
if (rowIndex === 1) {
return 'warning-row';
} else if (rowIndex === 3) {
return 'success-row';
}
return '';
},
//修改
updateBrand(index,row){
this.brand.id=row.id;
this.updateDialogVisible=true;
this.brand = JSON.parse(JSON.stringify(row));
},
edit(){
var _this=this;
axios({
method:"post",
url:"http://localhost:8098/brand-case/brand/upDate",
data:_this.brand
}).then(response =>{
if (response.data == "success") {
//添加成功
_this.updateDialogVisible = false
//刷新
_this.selectAll();
_this.$message({
message: '修改成功',
type: 'success'
});
}
})
},
// axios({
// method:"post",
// url:"http://localhost:8098/brand-case/brand/upDate",
// }).then(response => {
// if (response.data == "success") {
// //添加成功
// _this.updateDialogVisible = false
// //刷新
// _this.selectAll();
//
// _this.$message({
// message: '修改成功',
// type: 'success'
// });
//
// }
// })
//点击修改后唤起修改框
startUpdate(row) {
// 获取改行已经有的数据，以供填入修改框
// var _this = this
this.brand = JSON.parse(JSON.stringify(row));
// 弹出修改框
this.updateDialogVisible = true;
},
// 复选框选中后执行的方法
handleSelectionChange(val) {
this.multipleSelection = val;
console.log(this.multipleSelection)
},
// 查询方法
onSubmit() {
console.log(this.brand);
},
// 添加数据
addBrand() {
var _this = this;
axios({
method: "post",
url: "http://localhost:8098/brand-case/brand/add",
data: _this.brand
}).then(function (resp) {
if (resp.data == "success") {
//添加成功
_this.dialogVisible = false
//刷新
_this.selectAll();
_this.$message({
message: '添加成功',
type: 'success'
});
}
})
},
//批量删除
deleteByIds() {
// 弹出确认提示框
this.$confirm('此操作将删除该数据, 是否继续?', '提示', {
confirmButtonText: '确定',
cancelButtonText: '取消',
type: 'warning'
}).then(() => {
//用户点击确认按钮
//1. 创建id数组 [1,2,3], 从 this.multipleSelection 获取即可
for (let i = 0; i < this.multipleSelection.length; i++) {
let selectionElement = this.multipleSelection[i];
this.selectedIds[i] = selectionElement.id;
}
//2. 发送AJAX请求
var _this = this;
// 发送ajax请求，添加数据
axios({
method: "post",
url: "http://localhost:8098/brand-case/brand/deleteByIds",
data: _this.selectedIds
}).then(function (resp) {
if (resp.data == "success") {
//删除成功
// 重新查询数据
_this.selectAll();
// 弹出消息提示
_this.$message({
message: '恭喜你，删除成功',
type: 'success'
});
}
})
}).catch(() => {
//用户点击取消按钮
this.$message({
type: 'info',
message: '已取消删除'
});
});
}, //分页
handleSizeChange(val) {
console.log(`每页 ${val} 条`);
}
,
handleCurrentChange(val) {
console.log(`当前页: ${val}`);
}
},
data() {
return {
// 当前页码
currentPage: 4,
// 添加数据对话框是否展示的标记
dialogVisible: false,
updateDialogVisible: false,
// 品牌模型数据
brand: {
status: '',
brandName: '',
companyName: '',
id: "",
ordered: "",
description: ""
},
// 被选中的id数组
selectedIds:[],
// 复选框选中数据集合
multipleSelection: [],
// 表格数据
tableData: [{}]
}
},
})
script>
body>
html>
七、解决修改、添加中文字符显示问号
在mybatis-config.xml中，在数据库配置路径后添加：
characterEncoding=utf-8
jdbc:mysql:///db1?useSSL=false&characterEncoding=utf-8
参考文章:
https://blog.csdn.net/qq_42078934/article/details/125436314
https://blog.csdn.net/qq_51272114/article/details/127039314
能力有限，欢迎指正！