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T
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未验证 提交 2871fe12 编写于 作者: sangshuduo's avatar sangshuduo 提交者： GitHub
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fix: update nodejs example for 3.0 (#19765)

上级 2783d914
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examples/nodejs/node-example-raw.js 已删除 100644 → 0
浏览文件 @ 2783d914
/* This example is to show how to use the td-connector through the cursor only and is a bit more raw.
* No promises, object wrappers around data, functions that prettify the data, or anything.
* The cursor will generally use callback functions over promises, and return and store the raw data from the C Interface.
* It is advised to use the td-connector through the cursor and the TaosQuery class amongst other higher level APIs.
*/
// Get the td-connector package
const taos = require('td2.0-connector');
/* We will connect to TDengine by passing an object comprised of connection options to taos.connect and store the
* connection to the variable conn
*/
/*
* Connection Options
* host: the host to connect to
* user: the use to login as
* password: the password for the above user to login
* config: the location of the taos.cfg file, by default it is in /etc/taos
* port: the port we connect through
*/
var conn = taos.connect({host:"127.0.0.1", user:"root", password:"taosdata", config:"/etc/taos",port:0});
// Initialize our TDengineCursor, which we use to interact with TDengine
var c1 = conn.cursor();
// c1.execute(query) will execute the query
// Let's create a database named db
try {
c1.execute('create database if not exists db;');
}
catch(err) {
conn.close();
throw err;
}
// Now we will use database db
try {
c1.execute('use db;');
}
catch (err) {
conn.close();
throw err;
}
// Let's create a table called weather
// which stores some weather data like humidity, AQI (air quality index), temperature, and some notes as text
try {
c1.execute('create table if not exists weather (ts timestamp, humidity smallint, aqi int, temperature float, notes binary(30));');
}
catch (err) {
conn.close();
throw err;
}
// Let's get the description of the table weather
try {
c1.execute('describe db.weather');
}
catch (err) {
conn.close();
throw err;
}
// To get results, we run the function c1.fetchall()
// It only returns the query results as an array of result rows, but also stores the latest results in c1.data
try {
var tableDesc = c1.fetchall(); // The description variable here is equal to c1.data;
console.log(tableDesc);
}
catch (err) {
conn.close();
throw err;
}
// Let's try to insert some random generated data to test with
let stime = new Date();
let interval = 1000;
// Timestamps must be in the form of "YYYY-MM-DD HH:MM:SS.MMM" if they are in milliseconds
// "YYYY-MM-DD HH:MM:SS.MMMMMM" if they are in microseconds
// Thus, we create the following function to convert a javascript Date object to the correct formatting
function convertDateToTS(date) {
let tsArr = date.toISOString().split("T")
return "\"" + tsArr[0] + " " + tsArr[1].substring(0, tsArr[1].length-1) + "\"";
}
try {
for (let i = 0; i < 10000; i++) {
stime.setMilliseconds(stime.getMilliseconds() + interval);
let insertData = [convertDateToTS(stime),
parseInt(Math.random()*100),
parseInt(Math.random()*300),
parseFloat(Math.random()*10 + 30),
"\"random note!\""];
c1.execute('insert into db.weather values(' + insertData.join(',') + ' );');
}
}
catch (err) {
conn.close();
throw err;
}
// Now let's look at our newly inserted data
var retrievedData;
try {
c1.execute('select * from db.weather;')
retrievedData = c1.fetchall();
// c1.fields stores the names of each column retrieved
console.log(c1.fields);
console.log(retrievedData);
// timestamps retrieved are always JS Date Objects
// Numbers are numbers, big ints are big ints, and strings are strings
}
catch (err) {
conn.close();
throw err;
}
// Let's try running some basic functions
try {
c1.execute('select count(*), avg(temperature), max(temperature), min(temperature), stddev(temperature) from db.weather;')
c1.fetchall();
console.log(c1.fields);
console.log(c1.data);
}
catch(err) {
conn.close();
throw err;
}
conn.close();
// Feel free to fork this repository or copy this code and start developing your own apps and backends with NodeJS and TDengine!
examples/nodejs/node-example.js 已删除 100644 → 0
浏览文件 @ 2783d914
/* This example is to show the preferred way to use the td-connector */
/* To run, enter node path/to/node-example.js */
// Get the td-connector package
const taos = require('td2.0-connector');
/* We will connect to TDengine by passing an object comprised of connection options to taos.connect and store the
* connection to the variable conn
*/
/*
* Connection Options
* host: the host to connect to
* user: the use to login as
* password: the password for the above user to login
* config: the location of the taos.cfg file, by default it is in /etc/taos
* port: the port we connect through
*/
var conn = taos.connect({host:"127.0.0.1", user:"root", password:"taosdata", config:"/etc/taos",port:0});
// Initialize our TDengineCursor, which we use to interact with TDengine
var c1 = conn.cursor();
// c1.query(query) will return a TaosQuery object, of which then we can execute. The execute function then returns a promise
// Let's create a database named db
try {
c1.execute('create database if not exists db;');
//var query = c1.query('create database if not exists db;');
//query.execute();
}
catch(err) {
conn.close();
throw err;
}
// Now we will use database db. As this query won't return any results,
// we can simplify the code and directly use the c1.execute() function. No need for a TaosQuery object to wrap around the query
try {
c1.execute('use db;');
}
catch (err) {
conn.close();
throw err;
}
// Let's create a table called weather
// which stores some weather data like humidity, AQI (air quality index), temperature, and some notes as text
// We can also immedietely execute a TaosQuery object by passing true as the secodn argument
// This will then return a promise that we can then attach a callback function to
try {
var promise = c1.query('create table if not exists weather (ts timestamp, humidity smallint, aqi int, temperature float, notes binary(30));', true);
promise.then(function(){
console.log("Table created!");
}).catch(function() {
console.log("Table couldn't be created.")
});
}
catch (err) {
conn.close();
throw err;
}
// Let's get the description of the table weather
// When using a TaosQuery object and then executing it, upon success it returns a TaosResult object, which is a wrapper around the
// retrieved data and allows us to easily access data and manipulate or display it.
try {
c1.query('describe db.weather;').execute().then(function(result){
// Result is an instance of TaosResult and has the function pretty() which instantly logs a prettified version to the console
result.pretty();
});
}
catch (err) {
conn.close();
throw err;
}
Date.prototype.Format = function(fmt){
var o = {
'M+': this.getMonth() + 1,
'd+': this.getDate(),
'H+': this.getHours(),
'm+': this.getMinutes(),
's+': this.getSeconds(),
'S+': this.getMilliseconds()
};
if (/(y+)/.test(fmt)) {
fmt = fmt.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));
}
for (var k in o) {
if (new RegExp('(' + k + ')').test(fmt)) {
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (('00' + o[k]).substr(String(o[k]).length)));
}
}
return fmt;
}
// Let's try to insert some random generated data to test with
// We will use the bind function of the TaosQuery object to easily bind values to question marks in the query
// For Timestamps, a normal Datetime object or TaosTimestamp or milliseconds can be passed in through the bind function
let stime = new Date();
let interval = 1000;
try {
for (let i = 0; i < 1000; i++) {
stime.setMilliseconds(stime.getMilliseconds() + interval);
//console.log(stime.Format('yyyy-MM-dd HH:mm:ss.SSS'));
let insertData = [stime,
parseInt(Math.random()*100),
parseInt(Math.random()*300),
parseFloat(Math.random()*10 + 30),
"Note"];
//c1.execute('insert into db.weather values(' + insertData.join(',') + ' );');
//var query = c1.query('insert into db.weather values(?, ?, ?, ?, ?);').bind(insertData);
//query.execute();
c1.execute('insert into db.weather values(\"'+stime.Format('yyyy-MM-dd HH:mm:ss.SSS')+'\",'+parseInt(Math.random() * 100)+','+parseInt(Math.random() * 300)+','+parseFloat(Math.random()*10 + 30)+',"Note");');
}
}catch (err) {
conn.close();
throw err;
}
// Now let's look at our newly inserted data
var retrievedData;
try {
c1.query('select * from db.weather limit 5 offset 100;', true).then(function(result){
//result.pretty();
console.log('=========>'+JSON.stringify(result));
// Neat!
});
}
catch (err) {
conn.close();
throw err;
}
// Let's try running some basic functions
try {
c1.query('select count(*), avg(temperature), max(temperature), min(temperature), stddev(temperature) from db.weather;', true)
.then(function(result) {
result.pretty();
})
}
catch(err) {
conn.close();
throw err;
}
conn.close();
// Feel free to fork this repository or copy this code and start developing your own apps and backends with NodeJS and TDengine!
examples/nodejs/nodejsChecker.js
浏览文件 @ 2871fe12
const taos = require('td2.0-connector');
//const taos = require('../../../src/connector/nodejs/');
const taos = require("@tdengine/client");
var host = null;
var port = 6030;
for(var i = 2; i < global.process.argv.length; i++){
var key = global.process.argv[i].split("=")[0];
var value = global.process.argv[i].split("=")[1];
if("host" == key){
host = value;
}
if("port" == key){
port = value;
}
var key = global.process.argv[i].split("=")[0];
var value = global.process.argv[i].split("=")[1];
if("host" == key){
host = value;
}
if("port" == key){
port = value;
}
}
if(host == null){
console.log("Usage: node nodejsChecker.js host=<hostname> port=<port>");
process.exit(0);
console.log("Usage: node nodejsChecker.js host=<hostname> port=<port>");
process.exit(0);
}
// establish connection
var conn = taos.connect({host:host, user:"root", password:"taosdata",port:port});
var cursor = conn.cursor();
var cursor = conn.cursor();
// create database
executeSql("create database if not exists test", 0);
// use db
......@@ -40,22 +38,22 @@ executeQuery("select * from test.weather");
conn.close();
function executeQuery(sql){
var start = new Date().getTime();
var promise = cursor.query(sql, true);
var end = new Date().getTime();
promise.then(function(result){
printSql(sql, result != null,(end - start));
result.pretty();
});
var start = new Date().getTime();
var promise = cursor.query(sql, true);
var end = new Date().getTime();
promise.then(function(result){
printSql(sql, result != null,(end - start));
result.pretty();
});
}
function executeSql(sql, affectRows){
var start = new Date().getTime();
var promise = cursor.execute(sql);
var end = new Date().getTime();
printSql(sql, promise == affectRows, (end - start));
var start = new Date().getTime();
var promise = cursor.execute(sql);
var end = new Date().getTime();
printSql(sql, promise == affectRows, (end - start));
}
function printSql(sql, succeed, cost){
console.log("[ "+(succeed ? "OK" : "ERROR!")+" ] time cost: " + cost + " ms, execute statement ====> " + sql);
}
console.log("[ "+(succeed ? "OK" : "ERROR!")+" ] time cost: " + cost + " ms, execute statement ====> " + sql);
}
\ No newline at end of file
examples/nodejs/test1970.js 已删除 100644 → 0
浏览文件 @ 2783d914
const taos = require('td2.0-connector');
var conn = taos.connect({host:"127.0.0.1", user:"root", password:"taosdata", config:"/etc/taos",port:0})
var c1 = conn.cursor(); // Initializing a new cursor
let stime = new Date();
let interval = 1000;
function convertDateToTS(date) {
let tsArr = date.toISOString().split("T")
return "\"" + tsArr[0] + " " + tsArr[1].substring(0, tsArr[1].length - 1) + "\"";
}
function R(l, r) {
return Math.random() * (r - l) - r;
}
function randomBool() {
if (Math.random() < 0.5) {
return true;
}
return false;
}
// Initialize
const dbname = "nodejs_1970_db";
const tbname = "t1";
let dropDB = "drop database if exists " + dbname
console.log(dropDB);//asdasdasd
c1.execute(dropDB);///asdasd
let createDB = "create database " + dbname + " keep 36500"
console.log(createDB);
c1.execute(createDB);
let useTbl = "use " + dbname
console.log(useTbl)
c1.execute(useTbl);
let createTbl = "create table if not exists " + tbname + "(ts timestamp,id int)"
console.log(createTbl);
c1.execute(createTbl);
//1969-12-31 23:59:59.999
//1970-01-01 00:00:00.000
//1970-01-01 07:59:59.999
//1970-01-01 08:00:00.000a
//1628928479484 2021-08-14 08:07:59.484
let sql1 = "insert into " + dbname + "." + tbname + " values('1969-12-31 23:59:59.999',1)"
console.log(sql1);
c1.execute(sql1);
let sql2 = "insert into " + dbname + "." + tbname + " values('1970-01-01 00:00:00.000',2)"
console.log(sql2);
c1.execute(sql2);
let sql3 = "insert into " + dbname + "." + tbname + " values('1970-01-01 07:59:59.999',3)"
console.log(sql3);
c1.execute(sql3);
let sql4 = "insert into " + dbname + "." + tbname + " values('1970-01-01 08:00:00.000',4)"
console.log(sql4);
c1.execute(sql4);
let sql5 = "insert into " + dbname + "." + tbname + " values('2021-08-14 08:07:59.484',5)"
console.log(sql5);
c1.execute(sql5);
// Select
let query1 = "select * from " + dbname + "." + tbname
console.log(query1);
c1.execute(query1);
var d = c1.fetchall();
console.log(c1.fields);
for (let i = 0; i < d.length; i++)
console.log(d[i][0].valueOf());
//initialize
let initSql1 = "drop table if exists " + tbname
console.log(initSql1);
c1.execute(initSql1);
console.log(createTbl);
c1.execute(createTbl);
c1.execute(useTbl)
//-28800001 1969-12-31 23:59:59.999
//-28800000 1970-01-01 00:00:00.000
//-1 1970-01-01 07:59:59.999
//0 1970-01-01 08:00:00.00
//1628928479484 2021-08-14 08:07:59.484
let sql11 = "insert into " + dbname + "." + tbname + " values(-28800001,11)";
console.log(sql11);
c1.execute(sql11);
let sql12 = "insert into " + dbname + "." + tbname + " values(-28800000,12)"
console.log(sql12);
c1.execute(sql12);
let sql13 = "insert into " + dbname + "." + tbname + " values(-1,13)"
console.log(sql13);
c1.execute(sql13);
let sql14 = "insert into " + dbname + "." + tbname + " values(0,14)"
console.log(sql14);
c1.execute(sql14);
let sql15 = "insert into " + dbname + "." + tbname + " values(1628928479484,15)"
console.log(sql15);
c1.execute(sql15);
// Select
console.log(query1);
c1.execute(query1);
var d = c1.fetchall();
console.log(c1.fields);
for (let i = 0; i < d.length; i++)
console.log(d[i][0].valueOf());
setTimeout(function () {
conn.close();
}, 2000);
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