(目录)
1. 前言
上帖子使用云函数端云一体化开发计算十二生肖，此贴使用云数据库端云一体化开发计算十二生肖，在DevEco Studio可以完成端侧代码开发和云侧代码开发，一键部署云数据库，效果与之前使用云函数一样，计算获取方式不同。
2. 真机效果
3. 讲解
创建端云一体化项目，这里就不介绍的，创建、部署云数据库官方详细教程 开发云数据库 端云一体化项目结构和之前不一样，多了CloudProgram模块, 下面介绍项目开发，先从云侧开发开始，再到端侧开发。
4. 云侧开发
4.1 介绍云数据库目录结构
展开CloudProgram模块，展开clouddb目录，dataentry目录是存储数据条目文件，objecttype目录是存储对象类型文件，db-config.json自动生成，内容包含云数据库配置，目录结构如下图：
4.2 定义对象类型
右击objecttype目录，创建对象类型
{
fields: [
{
belongPrimaryKey: true,
fieldName: idx,
fieldType: Integer,
isNeedEncrypt: false,
notNull: true
},
{
belongPrimaryKey: false,
fieldName: zodiacName,
fieldType: String,
isNeedEncrypt: false,
notNull: false
}
],
indexes: [
{
indexName: idxIndex,
indexList: [
{
fieldName: idx,
sortType: ASC
}
]
},
{
indexName: zodiacIndex,
indexList: [
{
fieldName: zodiacName,
sortType: DESC
}
]
}
],
objectTypeName: ZodiacObject,
permissions: [
{
rights: [
Read
],
role: World
},
{
rights: [
Read,
Upsert
],
role: Authenticated
},
{
rights: [
Read,
Upsert,
Delete
],
role: Creator
},
{
rights: [
Read,
Upsert,
Delete
],
role: Administrator
}
]
}
4.3 定义数据条目
右击dataentry目录，创建数据条目
{
cloudDBZoneName: cloudDBZoneZodiac,
objectTypeName: ZodiacObject,
objects: [
{
idx: 0,
zodiacName: 猴
},
{
idx: 1,
zodiacName: 鸡
},
{
idx: 2,
zodiacName: 狗
},
{
idx: 3,
zodiacName: 猪
},
{
idx: 4,
zodiacName: 鼠
},
{
idx: 5,
zodiacName: 牛
},
{
idx: 6,
zodiacName: 虎
},
{
idx: 7,
zodiacName: 兔
},
{
idx: 8,
zodiacName: 龙
},
{
idx: 9,
zodiacName: 蛇
},
{
idx: 10,
zodiacName: 马
},
{
idx: 11,
zodiacName: 羊
}
]
}
4.4 部署云数据库
部署云侧代码到AGC上，右击clouddb目录，选择Deploy Cloud DB， 自动部署到AGC上，如果提示没有登录，登录成功后，再操作一次部署。
4.5 导出文件格式
4.5.1 登录到AGC->云数据库，进入当前项目的云数据库服务菜单，可分别在“对象类型”、“存储区”与“数据”页签查看到您刚刚部署的云数据库资源。
4.5.2 导出json格式文件
4.5.3 导出js格式文件
4.5.3 导出json文件和js文件，端侧使用到。
5. 端侧开发
5.1 端侧模块结构
先看一下端侧模块结构：
5.2 common目录
common目录放一些公共的封装类，比如Log类； components目录放自定义组件；entryability是自动生成的，里面有一个EntryAbility类，包含生命周期；pages目录放UI布局页面；services目录放业务逻辑类，比如调用云侧接口。
5.3 services目录
这里只介绍services目录的工作，先介绍如何和AGC连接上的，这里使用一个单独的文件来处理: 5.3.1 services目录下AgcConfig.ts
import agconnect from '@hw-agconnect/api-ohos';
import @hw-agconnect/core-ohos;
import @hw-agconnect/auth-ohos;
import '@hw-agconnect/auth-types-ohos';
import { Log } from '../common/Log';
const TAG = [AGCConfig];
export function getAGConnect(context) {
try {
agconnect.instance().init(context);
Log.info(TAG, xx init AGC SDK success);
return agconnect;
}
catch (err) {
Log.error(TAG, xx initAgcSDK failed + err);
}
}
5.3.2 在services目录下创建app-schema.json文件，复制上面在AGC下载的json格式文件内容到app-schema.json里
{
schemaVersion: 1,
permissions: [{
permissions: [{
role: World,
rights: [Read]
}, {
role: Authenticated,
rights: [Read, Upsert]
}, {
role: Creator,
rights: [Read, Upsert, Delete]
}, {
role: Administrator,
rights: [Read, Upsert, Delete]
}],
objectTypeName: ZodiacObject
}],
objectTypes: [{
indexes: [{
indexName: zodiacIndex,
indexList: [{
fieldName: zodiacName,
sortType: DESC
}]
}, {
indexName: idxIndex,
indexList: [{
fieldName: idx,
sortType: ASC
}]
}],
objectTypeName: ZodiacObject,
fields: [{
isNeedEncrypt: false,
fieldName: idx,
notNull: true,
isSensitive: false,
belongPrimaryKey: true,
fieldType: Integer
}, {
isNeedEncrypt: false,
fieldName: zodiacName,
notNull: false,
isSensitive: false,
belongPrimaryKey: false,
fieldType: String
}]
}]
}
5.3.3 在services目录下创建ZodiacObject.js文件，复制上面在AGC下载的js格式文件内容到ZodiacObject.js里
/*
* Copyright (c) Huawei Technologies Co., Ltd. 2020-2020. All rights reserved.
* Generated by the CloudDB ObjectType compiler. DO NOT EDIT!
*/
class ZodiacObject {
constructor() {
this.idx = undefined;
this.zodiacName = undefined;
}
setIdx(idx) {
this.idx = idx;
}
getIdx() {
return this.idx;
}
setZodiacName(zodiacName) {
this.zodiacName = zodiacName;
}
getZodiacName() {
return this.zodiacName;
}
}
ZodiacObject.className = 'ZodiacObject';
export {ZodiacObject}
5.3.4 services目录下创建CloudDB.ts
import * as schema from './app-schema.json';
import { ZodiacObject } from './ZodiacObject'
import { AGConnectCloudDB, CloudDBZone, CloudDBZoneQuery } from '@hw-agconnect/database-ohos';
import { AGCRoutePolicy } from '@hw-agconnect/core-ohos';
import { getAGConnect } from './AgcConfig';
export class CloudDBService {
private static ZONE_NAME: string = cloudDBZoneZodiac
private static init(context: any): Promise<CloudDBZone> {
return new Promise((resolve, reject) => {
// 获取AGC连接
getAGConnect(context);
AGConnectCloudDB.initialize(context);
AGConnectCloudDB.getInstance({
context: context,
agcRoutePolicy: AGCRoutePolicy.CHINA,
objectTypeInfo: schema
}).then((ret) => {
return resolve(ret.openCloudDBZone(this.ZONE_NAME));
}).catch((err) => {
return reject(err);
});
})
}
public static query(context: any, year: number): Promise<ZodiacObject> {
let idx = year%12;
return new Promise((resolve, reject) => {
const query = CloudDBZoneQuery.where(ZodiacObject).equalTo(idx, idx);
this.init(context).then((ret) => {
ret.executeQuery(query).then((ret) => {
resolve(ret.getSnapshotObjects()[0]);
})
}).catch((err) => {
reject(err);
});
})
}
}
5.4 pages目录
pages目录 Index.ts 这里是页面布局，上面看到的效果，就是这里实现的。
import { CloudDBService } from '../services/CloudDB';
@Entry
@Component
struct Index {
// 存储选择年份
@State year: number = 2022
// 计算出来生肖
@State born: string = ?
// 是否在计算中
@State flag: boolean = false
// 计算生肖
getBorn() {
// 标识为计算中
this.flag = true;
console.info('xx Page year: ' + this.year)
// 封装参数
let params = {
year: this.year
}
// 调用云数据库
CloudDBService.query(getContext(this), this.year).then((res) => {
console.info('xx cloud db result: ' + JSON.stringify(res));
// 计算完成
this.flag = false;
// 结果赋值给生肖变量
this.born = res.zodiacName;
}).catch((err) => {
// 计算完成
this.flag = false;
console.error('xx error: ', err && err.message);
});
}
build() {
Stack() {
if (!this.flag) {
Column({space: 20}) {
Text('请选择年份')
.fontSize(20)
.fontWeight(FontWeight.Bold)
// 选择年份
Column() {
Text(this.year + '')
.fontSize(20)
.fontWeight(FontWeight.Bold)
.padding(10)
.width(100)
.border({ width: 1, radius: 8 })
}
.bindMenu([
{ value: '2006', action: () => {this.year = 2006; this.born = '?'} },
{ value: '2007', action: () => {this.year = 2007; this.born = '?'} },
{ value: '2008', action: () => {this.year = 2008; this.born = '?'} },
{ value: '2009', action: () => {this.year = 2009; this.born = '?'} },
{ value: '2010', action: () => {this.year = 2010; this.born = '?'} },
{ value: '2011', action: () => {this.year = 2011; this.born = '?'} },
{ value: '2012', action: () => {this.year = 2012; this.born = '?'} },
{ value: '2013', action: () => {this.year = 2013; this.born = '?'} },
{ value: '2014', action: () => {this.year = 2014; this.born = '?'} },
{ value: '2015', action: () => {this.year = 2015; this.born = '?'} },
{ value: '2016', action: () => {this.year = 2016; this.born = '?'} },
{ value: '2017', action: () => {this.year = 2017; this.born = '?'} },
{ value: '2018', action: () => {this.year = 2018; this.born = '?'} },
{ value: '2019', action: () => {this.year = 2019; this.born = '?'} },
{ value: '2020', action: () => {this.year = 2020; this.born = '?'} },
{ value: '2021', action: () => {this.year = 2021; this.born = '?'} },
{ value: '2022', action: () => {this.year = 2022; this.born = '?'} },
{ value: '2023', action: () => {this.year = 2023; this.born = '?'} },
{ value: '2024', action: () => {this.year = 2024; this.born = '?'} },
{ value: '2025', action: () => {this.year = 2025; this.born = '?'} }
])
// 计算按钮操作
Button('计算', {type: ButtonType.Normal, stateEffect: true})
.fontSize(18)
.borderRadius(8)
.width(100)
.margin({bottom: 20})
.onClick(() => {
// 根据年份计算生肖
this.getBorn()
})
// 显示计算结果
Text(`${this.year} 年生肖是 ${this.born}`)
.fontSize(20)
.fontWeight(FontWeight.Bold)
}
.width('100%')
.height('100%')
.padding({top: '33%'})
} else {
// 计算中
LoadingProgress().color(Color.Blue)
.backgroundColor(Color.Transparent)
}
}
}
}
6. 总结
由于调用云侧云数据库是异步的，不能马上返回结果，这里添加LoadingProgress组件，让用户知道在运行中，效果看得不是很明显，可能录制时，网速很快，LoadingProgress组件闪一下就不见了，如果遇到网络慢时，LoadingProgress就会一直转，直到云数据库返回响应时，再消失LoadingProgress。
本文作者：狼哥Army
想了解更多关于开源的内容，请访问：
51CTO 开源基础软件社区
https://ost.51cto.com/#bkwz