IndexedDB 的api

最新推荐文章于 2024-12-06 19:00:00 发布

jayccx

最新推荐文章于 2024-12-06 19:00:00 发布

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CC 4.0 BY-SA版权

分类专栏：笔记文章标签： vue.js javascript db

原文链接：https://www.jianshu.com/p/718c3bfe1e09

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本文介绍了如何使用Vue.js结合IndexedDB实现本地持久化存储，包括添加、获取、更新和删除操作。通过实例展示了如何在前端应用中有效管理数据，提升用户体验。

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="../vue/vue.js"></script>
</head>
<body>  
    
<div id="app">
    ID:<input type="text" v-model="add_info.id">
    Name:<input type="text" v-model="add_info.name">
    age:<input type="text" v-model="add_info.age">
    email:<input type="text" v-model="add_info.email">
    <input type="button" value="添加" @click="add">
    <input type="button" value="修改" @click="update">
    <p v-for="item in list" :key="item.id">
        {{ item.id }} : {{ item.name }}:{{ item.age }}:{{ item.email }} == <input type="button" value="删除" @click="del(item.id)">
    </p>

</div>


    <script>


    var vm = new Vue({
        el:"#app",
        data:{
            list:[],
            db:null,
            add_info:{
                id:'',
                name:'',
                email:"",
                age:''
            },
            database_info:{
                db_name:"test1",
                store:"sse",
                version:1
            }
        },methods:{

            add(){
                var req = this.db.transaction([this.database_info['store']], 'readwrite').objectStore(this.database_info['store']).add(this.add_info);
                req.onsuccess = (event)=> {
                    console.log('数据写入成功');
                    this.list.push(this.add_info);
                };
                req.onerror = (event) => {
                    console.log('数据写入失败');
                }
            },
            get(){
                var transaction = db.transaction([database_info['store']]);
                var objectStore = transaction.objectStore(database_info['store']);
                var request = objectStore.get(1);
                request.onerror = function(event) {console.log('事务失败');};
                request.onsuccess = function( event) {
                    if (request.result) {
                        console.log('Name: ' + request.result.name);
                        console.log('Age: ' + request.result.age);
                        console.log('Email: ' + request.result.email);
                    } else {
                        console.log('未获得数据记录');
                    }
                };
            },
            getAll(){
                this.list = [];
                var objectStore = this.db.transaction(this.database_info['store']).objectStore(this.database_info['store']);
                objectStore.openCursor().onsuccess =  (event) => {
                    var cursor = event.target.result;
                    if (cursor) {
                        this.list.push(cursor.value)
                        cursor.continue();
                    } else {
                        console.log('没有更多数据了！');
                    }
                };
            },
            update(){
                var request = this.db.transaction([this.database_info['store']], 'readwrite').objectStore(this.database_info['store']).put(this.add_info);
                request.onsuccess =  (event) => {
                    console.log('数据更新成功');
                    this.getAll();
                };

                request.onerror = function (event) {
                    console.log('数据更新失败');
                }
            },
            del(id){
                var request = this.db.transaction([this.database_info['store']], 'readwrite').objectStore(this.database_info['store']).delete(id);
                request.onsuccess =  (event) => {
                    console.log('数据删除成功');
                    this.getAll();
                };
            }


        },mounted:function(){
            console.log("mounted");
            var request = window.indexedDB.open(this.database_info['db_name'], this.database_info['version']);

            //打开错误的回调函数
            request.onerror = function (event) {console.log('数据库打开报错');};

            // 成功打开的回调函数
            request.onsuccess =  (event) => {
                console.log('数据库打开成功');
                this.db = request.result;
                if (!this.db.objectStoreNames.contains(this.database_info['store'])) {
                    objectStore = this.db.createObjectStore(this.database_info['store'], { keyPath: 'id' });
                    objectStore.createIndex('name', 'name', { unique: false });
                    objectStore.createIndex('email', 'email', { unique: true });
                }
                this.getAll();
            };

            //版本状态更新的回调函数
            request.onupgradeneeded = (event) => {
                this.db = event.target.result;
                if (!this.db.objectStoreNames.contains(this.database_info['store'])) {
                    objectStore = this.db.createObjectStore(this.database_info['store'], { keyPath: 'id' });
                    objectStore.createIndex('name', 'name', { unique: false });
                    objectStore.createIndex('email', 'email', { unique: true });
                }
            }



        }
    });

    </script>
</body>
</html>