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clickhouse's Introduction

clickhouse

NodeJS client for ClickHouse. Send query over HTTP interface.

Install:

npm i clickhouse

Example:

const { ClickHouse } = require('clickhouse');

const clickhouse = new ClickHouse();

or with all options:

const clickhouse = new ClickHouse({
	url: 'http://localhost',
	port: 8123,
	debug: false,
	basicAuth: null,
	isUseGzip: false,
	config: {
		session_timeout                         : 60,
		output_format_json_quote_64bit_integers : 0,
		enable_http_compression                 : 0
	},
	
	// This object merge with request params (see request lib docs)
	reqParams: {
		...
	}
});

or change

basicAuth: null

to

basicAuth: {
username: 'default',
password: '',
},

Exec query:

const queries = [
	'DROP TABLE IF EXISTS session_temp',

	`CREATE TABLE session_temp (
		date Date,
		time DateTime,
		mark String,
		ips Array(UInt32),
		queries Nested (
			act String,
			id UInt32
		)
	)
	ENGINE=MergeTree(date, (mark, time), 8192)`,

	'OPTIMIZE TABLE ukit.loadstat PARTITION 201807 FINAL'
];

for(const query of queries) {
	const r = await clickhouse.query(query).toPromise();

	console.log(query, r);
}

Exec by callback way:

clickhouse.query(query).exec(function (err, rows) {
	...
});

Stream:

clickhouse.query(`SELECT number FROM system.numbers LIMIT 10`).stream()
	.on('data', function() {
		const stream = this;

		stream.pause();

		setTimeout(() => {
			stream.resume();
		}, 1000);
	})
	.on('error', err => {
		...
	})
	.on('end', () => {
		...
	});

or async stream:

// async iteration
for await (const row of clickhouse.query(sql).stream()) {
	console.log(row);
}

As promise:

const rows = await clickhouse.query(query).toPromise();

// use query with external data
const rows = await clickhouse.query('SELECT * AS count FROM temp_table', {
	external: [
		{
			name: 'temp_table',
			data: e._.range(0, rowCount).map(i => `str${i}`)
		},
	]
}).toPromise();

Set session:

clickhouse.sessionId = '...';
const r = await clickhouse.query(
	`CREATE TEMPORARY TABLE test_table
	(_id String, str String)
	ENGINE=Memory`
).toPromise();

Insert stream:

const ws = clickhouse.insert('INSERT INTO session_temp').stream();
for(let i = 0; i <= 1000; i++) {
	await ws.writeRow(
		[
			e._.range(0, 50).map(
				j => `${i}:${i * 2}:${j}`
			).join('-')
		]
	);
}

//wait stream finish
const result = await ws.exec();

Pipe readable stream to writable stream (across transform):

const rs = clickhouse.query(query).stream();

const tf = new stream.Transform({
	objectMode : true,
	transform  : function (chunk, enc, cb) {
		cb(null, JSON.stringify(chunk) + '\n');
	}
});

clickhouse.sessionId = Date.now();
const ws = clickhouse.insert('INSERT INTO session_temp2').stream();

const result = await rs.pipe(tf).pipe(ws).exec();

Changelogs:

  • 2019-02-13
    • Add compatibility with user and username options
  • 2019-02-07
    • Add TLS/SSL Protocol support
    • Add async iteration over SELECT

Links

clickhouse's People

Contributors

aiiejibcuhka avatar alekzonder avatar baryshev avatar lexasa avatar mhlm avatar rayvid avatar tgarifullin avatar timonkk avatar umaxfun avatar vdemtcev avatar xboston avatar

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