打字稿表达打字稿创建连接 [英] typescript express typeorm createconnection

问题描述

我正在使用打字稿表达节点typeorm创建一个应用程序.我遇到这样的问题，当我使用typeorm通过服务类对数据库进行调用时，找不到默认的连接.这是我的代码段:

I am creating an app with typescript express node typeorm. I am having this issue where when I make a call through a service class to the database using typeorm, I get connection default was not found. Here are my code snippets:

//dataservice class
import { Connection, getConnection, EntityManager, Repository, 
getManager } from "typeorm";

export class LeaveDataService {
private _db: Repository<Leave>;

constructor() {
    this._db = getManager().getRepository(Leave);
}

/**
 * applyForLeave
 */
public applyForLeave(leave: Leave): void {
    if(leave !== null) {
        let entity: Leave  = this._db.create(leave);
        this._db.save(entity);
    }
}

/**
 * getAllLeaves
 */
public async getAllLeaves(): Promise<Array<Leave>> {
    let leaves: Promise<Array<Leave>> = this._db.find({
        select: ["leaveDays","casualLeaveDays","id","staff","leaveType","endorsedBy","approvedBy"],
        relations: ["staff", "leaveType"],
        skip: 5,
        take: 15
    });

    return leaves;
}

这是我的ormconfig.json

this is my ormconfig.json

{
    "type":"sqlite",
    "entities": ["./models/*.js"],
    "database": "./leaveappdb.sql"
}

这是通过调用服务类(第一个片段)来响应请求的控制器":

and this is the "controller" that responds to requests by calling the service class which is the first snippet:

import { Request, Response } from "express";
import { LeaveDataService } from "../services/leaveDataService";
import { LeaveIndexApiModel } from '../ApiModels/leaveIndexApiModel';



const dataService: LeaveDataService = new LeaveDataService();

export let index = async (req: Request, res: Response) => {
let result = await dataService.getAllLeaves();
let viewresult = new Array<LeaveIndexApiModel>();

result.forEach(leave => {
    let apmodel = 
    new LeaveIndexApiModel(leave.leaveType.name, 
`${leave.staff.firstname} ${leave.staff.lastname}`, leave.id);
    viewresult.push(apmodel);
});


return res.status(200).send(viewresult);
}

然后这是我引导我的应用程序的地方.

then this is where I bootstrap my app.

import express = require('express');
import bodyParser = require('body-parser');
import path = require('path');
import * as home from './controllers/home';
import { createConnection } from 'typeorm';
import * as leavectrl from "./controllers/leaveController";
//create express server


//create app db connection.
createConnection().then(async connection => {
const app = express();
console.log("DB online!");
const approot = './';
const appport = process.env.Port || 8001;
//setup express for json parsing even with urlencoding
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.static(path.join(approot,'dist')));

//serve and respond to routes by api
app.get('/home', home.home);
app.get('/login',home.login);

//routes for leave
app.get('/api/leaves', leavectrl.index);
//default fall through
// app.get('*', (req: Request, res: Response)=>{
//     res.sendFile(approot,'dist/index.html');
// });

app.listen(appport, ()=> console.log(`api is alive on port 
${appport}`));

}).catch(error => console.log("Data Access Error : ", error));

推荐答案

您的配置似乎不错，但是您没有调用或使用ormconfig.json文件创建连接.

Your configuration is seems to be good but you didn't called or used your ormconfig.json file to createConnection.

例如:

createConnection(./ormconfig.json).then(async connection => {
}).catch(error => console.log("Data Access Error : ", error));

尝试使用或我将为您提供一种使用类对象进行配置以建立数据库连接的方法

Try with or i will give you a way to configure with class object to establish a DB connection

在配置文件中:

import "reflect-metadata";
import { ConnectionOptions } from "typeorm";
import { abc } from "../DatabaseEntities/abc";
import { def } from '../DatabaseEntities/def';

export let dbOptions: ConnectionOptions = {
            type: "sqlite",
            name: app,
            database: "./leaveappdb.sqlite3", 
            entities: [abc, def],
            synchronize: true,
} 

在server.ts中

In server.ts

import { createConnection, createConnections } from 'typeorm';
import * as appConfig from './Config/config';
createConnection(appConfig.dbOptions).then(async connection => {
    console.log("Connected to DB");
}).catch(error => console.log("TypeORM connection error: ", error));

我认为这可能对您有帮助.

I think this may help you..

此外，我发现要连接sqlite DB，您正在尝试连接sql文件.请确认一次.

Also, i have found that for connecting sqlite DB you are trying to connect a sql file. Kindly confirm that once too.

谢谢

这篇关于打字稿表达打字稿创建连接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！