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[英]How do I properly insert multiple rows into PG with node-postgres?
[英]How do I properly save this JSONB into PostgreSQL using node-postgres (pg)?
因此,我在 GET URL 中有信息,這些信息需要傳遞到 JSON 中,然后在 PostgreSQL 中保存(與增加的 ID 聚合以確保正確) 我寫了下面的代碼,它似乎沒有保存任何沒有錯誤的東西:
// Pg initialization
const { Client } = require('pg')
client = new Client({
host: 'localhost',
user: 'postgres',
password: 'passwordhere',
database: 'dbnamehere',
});
const createTableText = `
CREATE EXTENSION IF NOT EXISTS "pgcrypto";
CREATE TEMP TABLE IF NOT EXISTS cases (
id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
data JSONB
);
`
app.get('/test', async function (req, res) {
data = req.query.data;
console.log(data);
res.status(200).send(data);
// create our temp table
await client.query(createTableText)
//const newUser = { email: 'test@test.com' }
// create a new case
await client.query('INSERT INTO cases(data) VALUES($1)', [data])
const { rows } = await client.query('SELECT * FROM cases')
console.log(rows)
res.end();
});
我的 package.json 依賴項:
"dependencies": {
"express": "^4.17.1",
"mongoose": "^5.9.9",
"pg": "^8.0.3"
},
"devDependencies": {}
更新
我在文件末尾有這個錯誤處理代碼:
// Prints out more detailed errors
if(process.env.NODE_ENV !== 'production') {
process.once('uncaughtException', function(err) {
console.error('FATAL: Uncaught exception.');
console.error(err.stack||err);
setTimeout(function(){
process.exit(1);
}, 100);
});
}
我還嘗試安裝npm install express-promise-router
並添加以下代碼但沒有打印錯誤:
var router = require('express-promise-router')();
router.use('/test', function (req, res) {
return Promise.reject();
})
UPDATE2此代碼不關閉它打印出 JSONB,而不是如何保存它?:
const connectionString=urlhere;
const pool = new Pool({
connectionString: connectionString,
})
const client = new Client({
connectionString: connectionString,
})
client.connect()
更新3:
我刪除了異步代碼並使其同步。 我現在收到以下錯誤消息:
(node:10860) UnhandledPromiseRejectionWarning: Error: Connection terminated
at Connection.<anonymous> (/path/here/node_mo
dules/pg/lib/client.js:275:34)
at Object.onceWrapper (events.js:299:28)
at Connection.emit (events.js:215:7)
at Socket.<anonymous> (/path/here/node_module
s/pg/lib/connection.js:73:10)
at Socket.emit (events.js:210:5)
at TCP.<anonymous> (net.js:659:12)
(node:10860) 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(). (rejectio
n id: 1)
(node:10860) [DEP0018] DeprecationWarning: Unhandled promise rejections are depr
ecated. In the future, promise rejections that are not handled will terminate th
e Node.js process with a non-zero exit code.
(node:10860) UnhandledPromiseRejectionWarning: Error: Connection terminated
at Connection.<anonymous> (/path/here/client.js:275:34)
at Object.onceWrapper (events.js:299:28)
at Connection.emit (events.js:215:7)
at Socket.<anonymous> (/path/here/node_module
s/pg/lib/connection.js:73:10)
at Socket.emit (events.js:210:5)
at TCP.<anonymous> (net.js:659:12)
(node:10860) 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(). (rejectio
n id: 2)
(node:10860) UnhandledPromiseRejectionWarning: Error: Connection terminated
at Connection.<anonymous> (/path/here/node_mo
dules/pg/lib/client.js:275:34)
at Object.onceWrapper (events.js:299:28)
at Connection.emit (events.js:215:7)
at Socket.<anonymous> (/path/here/node_module
s/pg/lib/connection.js:73:10)
at Socket.emit (events.js:210:5)
at TCP.<anonymous> (net.js:659:12)
(node:10860) 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(). (rejectio
n id: 3)
我有一個使用 express-generator 文件夾結構生成的項目。 但它遵循節點 pg 建議的項目結構。
.
├── _bin
| ├── www
├── _db
| ├── index.js
├── _server
| ├── index.js
├── _sql
| ├── create.sql
| ├── insert.sql
| └── drop.sql
├──.env
├── package.json
└── app.js
數據庫/index.js
const { Pool } = require('pg')
const pool = new Pool()
module.exports = {
query: (text, params, callback) => {
return pool.query(text, params, callback)
},
}
在上面的文件中,憑據由 .env 文件加載。 但是你可以在你的問題中。
服務器/index.js
// notice here I'm requiring my database adapter file
// and not requiring node-postgres directly
const db = require('../db')
app.get('/:id', (req, res, next) => {
db.query('SELECT * FROM users WHERE id = $1', [req.params.id], (err, res) => {
if (err) {
return next(err)
}
res.send(res.rows[0])
})
})
現在在 sql 文件夾中,您應該放置您的 DDL 數據。
sql/create.sql
CREATE TABLE employee(
employee_id SERIAL PRIMARY KEY ,
login VARCHAR(20) NOT NULL,
password VARCHAR(512)
);
在這里,您可以僅使用psql
匯總命令,也可以創建一個包裝器以使用 javascript 運行 DDL 並在package.json
中使用它
如果你想在 javascript 中做一個包裝器
sql/create.js
const fs = require('fs'),
pg = require('../db/index'),
sql = fs.readFileSync(__dirname + '/../sql/create.sql').toString();
pg.query(sql, (err) => {
if (err) {
throw err;
}
})
現在在腳本部分的 package.json 中,您可以添加一個新行:
package.json
{
...
"name": "myawesomeproject",
"version": "1.0.0",
"description": "My wonderful description",
"main": "app.js",
"scripts": {
"start": "node ./bin/www",
"createdb": "node ./sql/create.js"
},
...
}
現在您可以使用npm run createdb
。
因此,在您的/test
路線中回答真正的問題應該是:
app.get('/test', async function (req, res) {
try {
const { rows } = await client.query('SELECT * FROM cases')
res.status(200).send(rows);
} catch {
res.status(500).send("Error. Detail: "+e)
}
});
//should insert data with post method, whole body is your current data.
app.post('/adddata', async (req, res) => {
const data = req.body;
console.log(data);
try {
await client.query('INSERT INTO cases(data) VALUES($1)', [data])
res.status(201).send('Data inserted');
} catch (e) {
res.status(500).send("Error. Detail: "+e)
}
})
確保您的客戶端正確連接到您的 Postgres 數據庫,嘗試添加一個client.connect()
和帶有控制台日志的基本查詢(在您的路由器之外)。
https://node-postgres.com/features/connecting
您的表是否正確創建意味着您已連接到數據庫?
NodeJS 和 DB 在您的計算機上還是在 docker 中?
該請求是否給您任何響應代碼?
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