Web IndexedDB Helper

浏览器数据库工具类

Version vom 18.08.2023. Aktuellste Version

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/473362/1237029/Web%20IndexedDB%20Helper.js

Du musst eine Erweiterung wie Tampermonkey, Greasemonkey oder Violentmonkey installieren, um dieses Skript zu installieren.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

Sie müssten eine Skript Manager Erweiterung installieren damit sie dieses Skript installieren können

(Ich habe schon ein Skript Manager, Lass mich es installieren!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Web IndexedDB Helper
// @namespace    web-indexed-database-helper
// @version      1.0.0
// @description  浏览器数据库工具类
// @author       如梦Nya
// @license      MIT
// ==/UserScript==

class _WebIndexedDBHelper {
    constructor() {
        /** @type {IDBDatabase} */
        this.db = undefined
    }

    /**
     * 打开数据库
     * @param {string} dbName 数据库名
     * @param {number | undefined} dbVersion 数据库版本
     * @returns {Promise<WebDB, any>}
     */
    open(dbName, dbVersion) {
        let self = this
        return new Promise(function (resolve, reject) {
            /** @type {IDBFactory} */
            const indexDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB
            let req = indexDB.open(dbName, dbVersion)
            req.onerror = reject
            req.onsuccess = function () {
                self.db = this.result
                resolve(self)
            }
        })
    }

    /**
     * 查出一条数据
     * @param {string} tableName 表名
     * @param {string} key 键名
     * @returns {Promise<any, any>}
     */
    get(tableName, key) {
        let self = this
        return new Promise(function (resolve, reject) {
            let req = self.db.transaction([tableName]).objectStore(tableName).get(key)
            req.onerror = reject
            req.onsuccess = function () {
                resolve(this.result)
            }
        })
    }

    /**
     * 插入、更新一条数据
     * @param {string} tableName 表名
     * @param {string} key 键名
     * @param {any} value 数据
     * @returns {Promise<IDBValidKey, any>}
     */
    put(tableName, key, value) {
        let self = this
        return new Promise(function (resolve, reject) {
            let req = self.db.transaction([tableName], 'readwrite').objectStore(tableName).put(value, key)
            req.onerror = reject
            req.onsuccess = function () {
                resolve(this.result)
            }
        })
    }

    /**
     * 关闭数据库
     */
    close() {
        this.db.close()
        delete this.db
    }
}

const WebDB = {
    /**
     * 打开数据库
     * @param {string} dbName 数据库名
     * @param {number | undefined} dbVersion 数据库版本
     * @returns {Promise<WebDB, any>}
     */
    open: function (dbName, dbVersion) {
        return new _WebIndexedDBHelper().open(dbName, dbVersion)
    }
}