typescript pouchdb通用数据库提供程序

Posted 2021-05-21

import {DatabaseProvider} from "./database/database";
import {LoginComponent} from "../components/login/login";

export class GenericDatabaseProvider {

  docType: string;

  constructor(
    protected databaseProvider: DatabaseProvider,
    docType: string) {
    this.docType = docType;
  }

  save(item: any): Promise<any> {
    if(!item.agentUsername) {
      item.agentUsername = LoginComponent.userEmail;
    }
    return this.databaseProvider.save(item, this.docType);
  }

  saveByType(item: any, docType: string): Promise<any> {
    return this.databaseProvider.save(item, docType);
  }

  putAttachment(docType: string, item: any, attachment: any, contentType = 'image/jpeg') {
    return this.databaseProvider.db.rel.putAttachment(docType, item, `${item.id}.jpeg`, attachment, contentType);
  }

  findById(id) {
    return this.databaseProvider.db.rel.find(this.docType, id);
  }

  findByIdAndType(id, type) {
    return this.databaseProvider.db.rel.find(type, id);
  }

  getAttachment(docType: string, docId: string, attachmentId: string, bindData) {
    return this.databaseProvider.db.rel
      .getAttachment(docType, docId, attachmentId)
        .then((data) => {
          const reader = new FileReader();
          reader.onloadend = () => {
            bindData(reader.result);
          };
          if (data) {
            reader.readAsDataURL(data);
          }
        })
        .catch((e) => {
          console.log('Error fetching attachment');
          console.dir(e);
        })
  }

}