我正在尝试通过NodeJs连接到Heroku的数据库。

我尝试连接到本地主机，并且运行良好。但是，当我尝试远程数据库时，它给出了错误。

这是运行正常的localhost连接代码。

const conectionString='postgressql://postgres:1234@localhost:5433/Qfield'
const client= new Client({
    connectionString:conectionString
})

client.connect()

//client.query('select * from point',(err,res)=>{
//    console.log(err,res)
//    client.end()
//})

client.query('SELECT * FROM trees',function(err,res) {
    console.log(err,res)
    client.end()
    });

错误连接是远程数据库。

const {Pool,Client}=require('pg')
const conectionString='postgressql://username:Password@ec2-54-228-243-29.eu-west-1.compute.amazonaws.com:5432/database'
const client= new Client({
    connectionString:conectionString
})

client.connect()

//client.query('select * from point',res)
    client.end()
    });

这是错误。

(node:14896) UnhandledPromiseRejectionWarning: error: no pg_hba.conf entry for host "193.140.225.88",user "vfoiltyjszbpav",database "dduigib0uc8ebt",SSL off
    at Connection.parseE (C:\Users\CBS Lab\Desktop\postgres_conn\node_modules\pg\lib\connection.js:604:11)
    at Connection.parseMessage (C:\Users\CBS Lab\Desktop\postgres_conn\node_modules\pg\lib\connection.js:401:19)
    at Socket.<anonymous> (C:\Users\CBS Lab\Desktop\postgres_conn\node_modules\pg\lib\connection.js:121:22)
    at Socket.emit (events.js:198:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at Socket.Readable.push (_stream_readable.js:224:10)
    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
(node:14896) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block,or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:14896) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future,promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
Error: Connection terminated unexpectedly
    at Connection.con.once (C:\Users\CBS Lab\Desktop\postgres_conn\node_modules\pg\lib\client.js:252:9)
    at Object.onceWrapper (events.js:286:20)
    at Connection.emit (events.js:198:13)
    at Socket.<anonymous> (C:\Users\CBS Lab\Desktop\postgres_conn\node_modules\pg\lib\connection.js:131:10)
    at Socket.emit (events.js:203:15)
    at endReadableNT (_stream_readable.js:1145:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)

如何解决此错误？我在做什么错了？