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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。
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。
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:
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"
    }
  ]
}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"
    }
  ]
}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。
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。
导出json格式文件。
导出js格式文件。
导出json文件和js文件,端侧使用到。
先看一下端侧模块结构:
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。
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:
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);
}
}
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"
    }]
  }]
}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}
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{ 
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{ 
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);
});
})
}
}
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)
      }
    }
  }
}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。
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