HarmonyOS 在Worker线程中如何创建一个RdbStore对象

/**
 * 1. 主线程中创建Store对象，这个代码可以正常创建出来
 * 2. Worker中无法创建出来，主要是那个getContext()方法调用会block住；
 */
relationalStore.getRdbStore(getContext(), config, (err, store) => {
  // 获取到Store
})
// getContext() 会引用到common.d.ts里面的代码
// declare function getContext(component?: Object): Context;
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HarmonyOS

put_get

2025-01-09 15:34:30

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回答 1

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zbw_apple

参考示例：

//Index.ets
import { worker } from '@kit.ArkTS';

@Entry
@Component
struct Index3 {
  @State message: string = 'Hello World';

  build() {
    Column() {
      Text(this.message)
        .id('Index3HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          let workerStageModel02 = new worker.ThreadWorker('xxxxx');
          let context = getContext()
          workerStageModel02.postMessage({ ctx: context })
        })
    }
    .height('100%')
    .width('100%')
  }
}
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// Worker.ets
import { ErrorEvent, MessageEvents, ThreadWorkerGlobalScope, worker } from '@kit.ArkTS';
import { relationalStore } from '@kit.ArkData';
import { BusinessError } from '@kit.BasicServicesKit';

const workerPort: ThreadWorkerGlobalScope = worker.workerPort;

const STORE_CONFIG: relationalStore.StoreConfig = {
  name: "RdbTest.db",
  securityLevel: relationalStore.SecurityLevel.S1
};

workerPort.onmessage = (e: MessageEvents) => {
  let context = e.data.ctx as Context
  relationalStore.getRdbStore(context, STORE_CONFIG, (err: BusinessError, rdbStore: relationalStore.RdbStore) => {
    if (err) {
      console.error(`Get RdbStore failed, code is ${err.code},message is ${err.message}`);
      return;
    }
    console.info('Get RdbStore successfully.');
  })
  console.log('relationalStore:' + e.data)
}
workerPort.onmessageerror = (e: MessageEvents) => {
}
workerPort.onerror = (e: ErrorEvent) => {
}
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