109 lines
3.4 KiB
JavaScript
109 lines
3.4 KiB
JavaScript
// 使用示例：
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// const db = new IndexedDB('myDatabase', 1, 'myStore')
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// await db.open()
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// await db.add({ id: 1, name: 'John' })
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// const data = await db.get(1)
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// console.log(data)
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// await db.delete(1)
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export default class IndexedDB {
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constructor(databaseName, databaseVersion, storeName) {
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this.databaseName = databaseName
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this.databaseVersion = databaseVersion
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this.storeName = storeName
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this.db = null
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}
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open() {
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return new Promise((resolve, reject) => {
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const request = indexedDB.open(this.databaseName, this.databaseVersion)
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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this.db = event.target.result
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resolve(this.db)
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}
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request.onupgradeneeded = (event) => {
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const db = event.target.result
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if (!db.objectStoreNames.contains(this.storeName)) {
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db.createObjectStore(this.storeName, { keyPath: 'id' })
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}
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}
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})
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}
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add(data) {
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console.log('add', data)
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return new Promise((resolve, reject) => {
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const transaction = this.db.transaction([this.storeName], 'readwrite')
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const objectStore = transaction.objectStore(this.storeName)
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// 判断是否已经存在
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const request = objectStore.get(data.id)
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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if (event.target.result) return resolve(event.target.result)
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const request = objectStore.add(data)
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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resolve(event.target.result)
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}
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}
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})
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}
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get(id) {
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console.log('get', id)
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return new Promise((resolve, reject) => {
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const transaction = this.db.transaction([this.storeName], 'readonly')
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const objectStore = transaction.objectStore(this.storeName)
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const request = objectStore.get(id)
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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resolve(event.target.result)
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}
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})
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}
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getAll() {
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return new Promise((resolve, reject) => {
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const transaction = this.db.transaction([this.storeName], 'readonly')
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const objectStore = transaction.objectStore(this.storeName)
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const request = objectStore.getAll()
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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resolve(event.target.result)
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}
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})
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}
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delete(id) {
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return new Promise((resolve, reject) => {
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const transaction = this.db.transaction([this.storeName], 'readwrite')
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const objectStore = transaction.objectStore(this.storeName)
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const request = objectStore.delete(id)
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request.onerror = (event) => {
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reject(event.target.error)
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}
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request.onsuccess = (event) => {
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resolve(event.target.result)
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}
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})
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}
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}
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