Added nodejs connector and example usage of nodejs

src/connector/nodejs/nodetaos/cinterface.js

+const ref = require('ref');
+const ffi = require('ffi');
+const ArrayType = require('ref-array');
+const Struct = require('ref-struct');
+const fieldTypes = require('./constants');
+const errors = require ('./error')
+
+module.exports = CTaosInterface;
+
+function convertMillisecondsToDatetime(time) {
+  return new Date(time);
+}
+function convertMicrosecondsToDatetime(time) {
+  return new Date(time * 0.001);
+}
+
+function convertTimestamp(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  timestampConverter = convertMillisecondsToDatetime;
+  if (micro == true) {
+    timestampConverter = convertMicrosecondsToDatetime;
+  }
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    let queue = [];
+    let time = 0;
+    for (let i = currOffset; i < currOffset + nbytes; i++) {
+      queue.push(data[i]);
+      if (data[i] == 0) {
+        break;
+      }
+    }
+    for (let i = queue.length - 1; i >= 0; i--) {
+      time += queue[i] * Math.pow(16, i * 2);
+    }
+    currOffset += nbytes;
+    res.push(timestampConverter(time));
+  }
+  return res;
+}
+function convertBool(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = new Array(data.length);
+  for (let i = 0; i < data.length; i++) {
+    if (data[i] == 0) {
+      res[i] = false;
+    }
+    else {
+      res[i] = true;
+    }
+  }
+  return res;
+}
+function convertTinyint(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(data.readIntLE(currOffset,1));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertSmallint(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(data.readIntLE(currOffset,2));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertInt(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(data.readInt32LE(currOffset));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function readBigInt64LE(buffer, offset = 0) {
+  const first = buffer[offset];
+  const last = buffer[offset + 7];
+  if (first === undefined || last === undefined)
+    boundsError(offset, buffer.length - 8);
+
+  const val = buffer[offset + 4] + buffer[offset + 5] * 2 ** 8 + buffer[offset + 6] * 2 ** 16 + (last << 24); // Overflow
+  return ((BigInt(val) << 32n) + BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24));
+}
+function convertBigint(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(BigInt(data.readInt64LE(currOffset)));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertFloat(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(parseFloat(data.readFloatLE(currOffset).toFixed(7)));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertDouble(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    res.push(parseFloat(data.readDoubleLE(currOffset).toFixed(16)));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertBinary(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    let dataEntry = data.slice(currOffset, currOffset + nbytes); //one entry in a row under a column;
+    res.push(ref.readCString(dataEntry));
+    currOffset += nbytes;
+  }
+  return res;
+}
+function convertNchar(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
+  data = ref.reinterpret(data.deref().deref(), nbytes * num_of_rows, offset);
+  let res = [];
+  let currOffset = 0;
+  //every 4;
+  while (currOffset < data.length) {
+    let dataEntry = data.slice(currOffset, currOffset + nbytes); //one entry in a row under a column;
+    res.push(dataEntry.toString("utf16le").replace(/\u0000/g, ""));
+    currOffset += nbytes;
+  }
+  return res;
+}
+
+//Object with all the relevant converters from pblock data to javascript data
+let convertFunctions = {
+    [fieldTypes.C_BOOL] : convertBool,
+    [fieldTypes.C_TINYINT] : convertTinyint,
+    [fieldTypes.C_SMALLINT] : convertSmallint,
+    [fieldTypes.C_INT] : convertInt,
+    [fieldTypes.C_BIGINT] : convertBigint,
+    [fieldTypes.C_FLOAT] : convertFloat,
+    [fieldTypes.C_DOUBLE] : convertDouble,
+    [fieldTypes.C_BINARY] : convertBinary,
+    [fieldTypes.C_TIMESTAMP] : convertTimestamp,
+    [fieldTypes.C_NCHAR] : convertNchar
+}
+
+// Define TaosField structure
+var char_arr = ArrayType(ref.types.char);
+var TaosField = Struct({
+                      'name': char_arr,
+                      });
+TaosField.fields.name.type.size = 64;
+TaosField.defineProperty('bytes', ref.types.short);
+TaosField.defineProperty('type', ref.types.char);
+
+//The C interface with the Taos TSDB
+function CTaosInterface (config = null, pass = false) {
+  ref.types.char_ptr = ref.refType(ref.types.char);
+  ref.types.void_ptr = ref.refType(ref.types.void);
+  /*Declare a bunch of functions first*/
+  this.libtaos = ffi.Library('libtaos', {
+    'taos_options': [ ref.types.int, [ ref.types.int , ref.types.void_ptr ] ],
+    'taos_init': [ ref.types.void, [ ] ],
+    //TAOS *taos_connect(char *ip, char *user, char *pass, char *db, int port)
+    'taos_connect': [ ref.types.void_ptr, [ ref.types.char_ptr, ref.types.char_ptr, ref.types.char_ptr, ref.types.char_ptr, ref.types.int ] ],
+    //void taos_close(TAOS *taos)
+    'taos_close': [ ref.types.void, [ ref.types.void_ptr ] ],
+    //TAOS_RES *taos_use_result(TAOS *taos);
+    'taos_use_result': [ ref.types.void_ptr, [ ref.types.void_ptr ] ],
+    //int taos_query(TAOS *taos, char *sqlstr)
+    'taos_query': [ ref.types.int, [ ref.types.void_ptr, ref.types.char_ptr ] ],
+    //int taos_affected_rows(TAOS *taos)
+    'taos_affected_rows': [ ref.types.int, [ ref.types.void_ptr] ],
+    //int taos_fetch_block(TAOS_RES *res, TAOS_ROW *rows)
+    'taos_fetch_block': [ ref.types.int, [ ref.types.void_ptr, ref.types.void_ptr] ],
+    //int taos_result_precision(TAOS_RES *res)
+    'taos_result_precision': [ ref.types.int, [ ref.types.void_ptr ] ],
+    //void taos_free_result(TAOS_RES *res)
+    'taos_free_result': [ ref.types.void, [ ref.types.void_ptr] ],
+    //int taos_field_count(TAOS *taos)
+    'taos_field_count': [ ref.types.int, [ ref.types.void_ptr ] ],
+    //TAOS_FIELD *taos_fetch_fields(TAOS_RES *res)
+    'taos_fetch_fields': [ ref.refType(TaosField),  [ ref.types.void_ptr ] ],
+    //int taos_errno(TAOS *taos)
+    'taos_errno': [ ref.types.int, [ ref.types.void_ptr] ],
+    //char *taos_errstr(TAOS *taos)
+    'taos_errstr': [ ref.types.char, [ ref.types.void_ptr] ]
+  });
+  if (pass == false) {
+    if (config == null) {
+      //check this buffer
+      this._config = ref.alloc(ref.types.char_ptr, ref.NULL);
+    }
+    else {
+      try {
+        this._config = ref.allocCString(config);;
+      }
+      catch(err){
+        throw "Attribute Error: config is expected as a str";
+      }
+    }
+    if (config != null) {
+      this.libtaos.taos_options(3, this._config);
+    }
+    this.libtaos.taos_init();
+  }
+}
+CTaosInterface.prototype.config = function config() {
+    return this._config;
+  }
+CTaosInterface.prototype.connect = function connect(host=null, user="root", password="taosdata", db=null, port=0) {
+  let _host,_user,_password,_db,_port;
+  try  {
+    _host = host != null ? ref.allocCString(host) : ref.alloc(ref.types.char_ptr, ref.NULL);
+  }
+  catch(err) {
+    throw "Attribute Error: host is expected as a str";
+  }
+  try {
+    _user = ref.allocCString(user)
+  }
+  catch(err) {
+    throw "Attribute Error: user is expected as a str";
+  }
+  try {
+    _password = ref.allocCString(password);
+  }
+  catch(err) {
+    throw "Attribute Error: password is expected as a str";
+  }
+  try {
+    _db = db != null ? ref.allocCString(db) : ref.alloc(ref.types.char_ptr, ref.NULL);
+  }
+  catch(err) {
+    throw "Attribute Error: db is expected as a str";
+  }
+  try {
+    _port = ref.alloc(ref.types.int, port);
+  }
+  catch(err) {
+    throw TypeError("port is expected as an int")
+  }
+  let connection = this.libtaos.taos_connect(_host, _user, _password, _db, _port);
+  if (ref.isNull(connection)) {
+    throw new errors.TDError('Failed to connect to TDengine');
+  }
+  else {
+    console.log('Successfully connected to TDengine');
+  }
+  return connection;
+}
+CTaosInterface.prototype.close = function close(connection) {
+  this.libtaos.taos_close(connection);
+  console.log("Connection is closed");
+}
+CTaosInterface.prototype.query = function query(connection, sql) {
+    let res = this.libtaos.taos_query(connection, ref.allocCString(sql));
+    return res;
+}
+CTaosInterface.prototype.affectedRows = function affectedRows(connection) {
+  return this.libtaos.taos_affected_rows(connection);
+}
+CTaosInterface.prototype.useResult = function useResult(connection) {
+  let result = this.libtaos.taos_use_result(connection);
+  let fields = [];
+  let pfields = this.fetchFields(result);
+  if (ref.isNull(pfields) == false) {
+    let fullpfields = ref.reinterpret(pfields, this.fieldsCount(connection) * 68, 0);
+    for (let i = 0; i < fullpfields.length; i += 68) {
+      //0 - 63 = name //64 - 65 = bytes, 66 - 67 = type
+      fields.push( {
+        name: ref.readCString(ref.reinterpret(fullpfields,64,i)),
+        bytes: fullpfields[i + 64],
+        type: fullpfields[i + 66]
+      })
+    }
+  }
+  return {result:result, fields:fields}
+}
+CTaosInterface.prototype.fetchBlock = function fetchBlock(result, fields) {
+  let pblock = ref.ref(ref.ref(ref.NULL));
+  let num_of_rows = this.libtaos.taos_fetch_block(result, pblock)
+  if (num_of_rows == 0) {
+    return {block:null, num_of_rows:0};
+  }
+  let isMicro = (this.libtaos.taos_result_precision(result) == fieldTypes.C_TIMESTAMP_MICRO)
+  let blocks = new Array(fields.length);
+  blocks.fill(null);
+  num_of_rows = Math.abs(num_of_rows);
+  let offset = 0;
+  for (let i = 0; i < fields.length; i++) {
+
+    if (!convertFunctions[fields[i]['type']] ) {
+      throw new errors.DatabaseError("Invalid data type returned from database");
+    }
+    let data = ref.reinterpret(pblock.deref().deref(), fields[i]['bytes'], offset);
+    blocks[i] = convertFunctions[fields[i]['type']](pblock, num_of_rows, fields[i]['bytes'], offset, isMicro);
+    offset += fields[i]['bytes'] * num_of_rows;
+  }
+  return {blocks: blocks, num_of_rows:Math.abs(num_of_rows)}
+}
+CTaosInterface.prototype.freeResult = function freeResult(result) {
+  this.libtaos.taos_free_result(result);
+  result = null;
+}
+CTaosInterface.prototype.fieldsCount = function fieldsCount(connection) {
+  return this.libtaos.taos_field_count(connection);
+}
+CTaosInterface.prototype.fetchFields = function fetchFields(result) {
+  return this.libtaos.taos_fetch_fields(result);
+}
+CTaosInterface.prototype.errno = function errno(connection) {
+  return this.libtaos.taos_errno(connection);
+}
+CTaosInterface.prototype.errStr = function errStr(connection) {
+  return (this.libtaos.taos_errstr(connection));
+}

src/connector/nodejs/nodetaos/connection.js

+const TDengineCursor = require('./cursor')
+const CTaosInterface = require('./cinterface')
+module.exports = TDengineConnection;
+
+/*
+ * TDengine Connection object
+ * @param {Object.<string, string>} options - Options for configuring the connection with TDengine
+ * @return {TDengineConnection}
+ *
+ *
+ */
+function TDengineConnection(options) {
+  this._conn = null;
+  this._host = null;
+  this._user = "root"; //The default user
+  this._password = "taosdata"; //The default password
+  this._database = null;
+  this._port = 0;
+  this._config = null;
+  this._chandle = null;
+  this.config(options)
+  return this;
+}
+
+TDengineConnection.prototype.config = function config(options) {
+  if (options['host']) {
+    this._host = options['host'];
+  }
+  if (options['user']) {
+    this._user = options['user'];
+  }
+  if (options['password']) {
+    this._password = options['password'];
+  }
+  if (options['database']) {
+    this._database = options['database'];
+  }
+  if (options['port']) {
+    this._port = options['port'];
+  }
+  if (options['config']) {
+    this._config = options['config'];
+  }
+  this._chandle = new CTaosInterface(this._config);
+  this._conn = this._chandle.connect(this._host, this._user, this._password, this._database, this._port);
+}
+
+TDengineConnection.prototype.close = function close() {
+  return this._chandle.close(this._conn);
+}
+TDengineConnection.prototype.cursor = function cursor() {
+  //Pass the connection object to the cursor
+  return new TDengineCursor(this);
+}
+TDengineConnection.prototype.commit = function commit() {
+  return this;
+}
+TDengineConnection.prototype.rollback = function rollback() {
+  return this;
+}
+TDengineConnection.prototype.clear_result_set = function clear_result_set() {
+  var result = this._chandle.useResult(this._conn).result;
+  if (result) {
+    this._chandle.freeResult(result)
+  }
+}

src/connector/nodejs/nodetaos/constants.js

+/*
+ * TDengine Field Types
+ *
+ *
+ */
+module.exports = {
+    // Type Code
+    C_NULL : 0,
+    C_BOOL : 1,
+    C_TINYINT : 2,
+    C_SMALLINT : 3,
+    C_INT : 4,
+    C_BIGINT : 5,
+    C_FLOAT : 6,
+    C_DOUBLE : 7,
+    C_BINARY : 8,
+    C_TIMESTAMP : 9,
+    C_NCHAR : 10,
+    // NULL value definition
+    // NOTE: These values should change according to C definition in tsdb.h
+    C_BOOL_NULL : 0x02,
+    C_TINYINT_NULL : -128,
+    C_SMALLINT_NULL : -32768,
+    C_INT_NULL : -2147483648,
+    C_BIGINT_NULL : -9223372036854775808,
+
+    C_TIMESTAMP_MILLI : 0,
+    C_TIMESTAMP_MICRO : 1,
+}

src/connector/nodejs/nodetaos/cursor.js

+const CTaosInterface = require('./cinterface')
+const errors = require ('./error')
+module.exports = TDengineCursor;
+
+function TDengineCursor(connection=null) {
+  this._description = null;
+  this._rowcount = -1;
+  this._connection = null;
+  this._result = null;
+  this._fields = null;
+  this.data = null;
+  this.fieldNames = null;
+  this.chandle = new CTaosInterface(null, true); //pass through, just need library loaded.
+  if (connection != null) {
+    this._connection = connection
+  }
+
+}
+TDengineCursor.prototype.description = function description() {
+  return this._description;
+}
+TDengineCursor.prototype.rowcount = function rowcount() {
+  return this._rowcount;
+}
+TDengineCursor.prototype.callproc = function callproc() {
+  return;
+}
+TDengineCursor.prototype.close = function close() {
+  if (this._connection == null) {
+    return false;
+  }
+  this._connection.clear_result_set();
+  this._reset_result();
+  this._connection = null;
+  return true;
+}
+TDengineCursor.prototype.execute = function execute(operation, params=null) {
+  if (operation == undefined) {
+    return null;
+  }
+  if (this._connection == null) {
+    throw new errors.ProgrammingError('Cursor is not connected');
+  }
+  this._connection.clear_result_set();
+  this._reset_result();
+
+  let stmt = operation;
+  if (params != null) {
+    //why pass?
+  }
+  res = this.chandle.query(this._connection._conn, stmt);
+  if (res == 0) {
+    let fieldCount = this.chandle.fieldsCount(this._connection._conn);
+    if (fieldCount == 0) {
+      return this.chandle.affectedRows(this._connection._conn); //return num of affected rows, common with insert, use statements
+    }
+    else {
+      let resAndField = this.chandle.useResult(this._connection._conn, fieldCount)
+      this._result = resAndField.result;
+      this._fields = resAndField.fields;
+      this.fieldNames = resAndField.fields.map(fieldData => fieldData.name);
+      return this._handle_result(); //return a pointer
+    }
+  }
+  else {
+    throw new errors.ProgrammingError(this.chandle.errStr(this._connection._conn))
+  }
+
+
+}
+TDengineCursor.prototype.executemany = function executemany() {
+
+}
+TDengineCursor.prototype.fetchone = function fetchone() {
+
+}
+TDengineCursor.prototype.fetchmany = function fetchmany() {
+
+}
+TDengineCursor.prototype.fetchall = function fetchall() {
+  if (this._result == null || this._fields == null) {
+    throw new errors.OperationalError("Invalid use of fetchall, either result or fields from query are null");
+  }
+  let data = [];
+  this._rowcount = 0;
+  let k = 0;
+  while(true) {
+    k+=1;
+    let blockAndRows = this.chandle.fetchBlock(this._result, this._fields);
+    let block = blockAndRows.blocks;
+    let num_of_rows = blockAndRows.num_of_rows;
+
+    if (num_of_rows == 0) {
+      break;
+    }
+    this._rowcount += num_of_rows;
+    for (let i = 0; i < num_of_rows; i++) {
+      data.push([]);
+      for (let j = 0; j < this._fields.length; j++) {
+        data[data.length-1].push(block[j][i]);
+      }
+    }
+  }
+  this._connection.clear_result_set();
+  this.data = data;
+  return data; //data[i]  returns the ith row, with all the data
+}
+TDengineCursor.prototype.nextset = function nextset() {
+  return;
+}
+TDengineCursor.prototype.setinputsize = function setinputsize() {
+  return;
+}
+TDengineCursor.prototype.setoutputsize = function setoutputsize(size, column=null) {
+  return;
+}
+TDengineCursor.prototype._reset_result = function _reset_result() {
+  this._description = null;
+  this._rowcount = -1;
+  this._result = null;
+  this._fields = null;
+  this.data = null;
+  this.fieldNames = null;
+}
+TDengineCursor.prototype._handle_result = function _handle_result() {
+  this._description = [];
+  for (let field of this._fields) {
+    this._description.push([field.name, field.type, null, null, null, null, false]);
+  }
+  return this._result;
+}

src/connector/nodejs/nodetaos/error.js

+/*
+Classes for exceptions
+Note: All exceptions thrown by Node.js or the JavaScript runtime will be instances of Error.
+https://nodejs.org/api/errors.html#errors_exceptions_vs_errors
+
+*/
+
+class TDError extends Error {
+  constructor(args) {
+    super(args)
+    this.name = "TDError";
+  }
+}
+class Warning extends Error {
+  // Exception raised for important warnings like data truncations while inserting.
+  constructor(args) {
+    super(args)
+    this.name = "Warning";
+  }
+}
+class InterfaceError extends TDError {
+  // Exception raised for errors that are related to the database interface rather than the database itself.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.InterfaceError";
+  }
+}
+class DatabaseError extends TDError {
+  // Exception raised for errors that are related to the database.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError";
+  }
+}
+class DataError extends DatabaseError {
+  // Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.DataError";
+  }
+}
+class OperationalError extends DatabaseError {
+  // Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.OperationalError";
+  }
+}
+class IntegrityError extends DatabaseError {
+  // Exception raised when the relational integrity of the database is affected.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.IntegrityError";
+  }
+}
+class InternalError extends DatabaseError {
+  // Exception raised when the database encounters an internal error.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.InternalError";
+  }
+}
+class ProgrammingError extends DatabaseError {
+  // Exception raised for programming errors.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.ProgrammingError";
+  }
+}
+class NotSupportedError extends DatabaseError {
+  // Exception raised in case a method or database API was used which is not supported by the database.
+  constructor(args) {
+    super(args)
+    this.name = "TDError.DatabaseError.NotSupportedError";
+  }
+}
+
+module.exports = {
+  TDError, Warning, InterfaceError, DatabaseError, DataError, OperationalError, IntegrityError, InternalError, ProgrammingError, NotSupportedError
+};

src/connector/nodejs/package-lock.json

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+    "util-deprecate": {
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+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
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+    },
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+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
+    "which": {
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+      }
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+    }
+  }
+}

src/connector/nodejs/package.json

+{
+  "name": "td-connector",
+  "version": "1.0.5",
+  "description": "A Node.js connector for TDengine.",
+  "main": "tdengine.js",
+  "scripts": {
+    "test": "node test/test.js"
+  },
+  "keywords": [
+    "TDengine",
+    "TAOS Data",
+    "Time Series Database",
+    "Connector"
+  ],
+  "author": "StoneT2000",
+  "license": "AGPL-3.0",
+  "dependencies": {
+    "ffi": "^2.3.0",
+    "node-gyp": "^5.0.2",
+    "ref": "^1.3.5",
+    "ref-array": "^1.2.0"
+  },
+  "homepage": "https://github.com/taosdata/tdengine",
+  "bugs": {
+    "url": "https://github.com/taosdata/tdengine/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/taosdata/tdengine.git"
+  }
+}

src/connector/nodejs/readme.md

+# TDengine Node.js connector
+This is the Node.js library that lets you connect to [TDengine](https://www.github.com/taosdata/tdengine).
+
+## Installation
+
+To get started, just type in the following to install the connector through [npm](https://www.npmjs.com/)
+
+```cmd
+npm install td-connector
+```
+
+To interact with TDengine, we make use of the [node-gyp[(https://github.com/nodejs/node-gyp)] library. To install, you will need to install the following depending on platform (the following instructions are quoted from node-gyp)
+
+### On Unix
+
+- `python` (`v2.7` recommended, `v3.x.x` is **not** supported)
+- `make`
+- A proper C/C++ compiler toolchain, like [GCC](https://gcc.gnu.org)
+
+### On macOS
+
+- `python` (`v2.7` recommended, `v3.x.x` is **not** supported) (already installed on macOS)
+
+- Xcode
+
+  - You also need to install the 
+
+    ```
+    Command Line Tools
+    ```
+
+     via Xcode. You can find this under the menu 
+
+    ```
+    Xcode -> Preferences -> Locations
+    ```
+
+     (or by running 
+
+    ```
+    xcode-select --install
+    ```
+
+     in your Terminal) 
+
+    - This step will install `gcc` and the related toolchain containing `make`
+
+### On Windows
+
+#### Option 1
+
+Install all the required tools and configurations using Microsoft's [windows-build-tools](https://github.com/felixrieseberg/windows-build-tools) using `npm install --global --production windows-build-tools` from an elevated PowerShell or CMD.exe (run as Administrator).
+
+#### Option 2
+
+Install tools and configuration manually:
+
+- Install Visual C++ Build Environment: [Visual Studio Build Tools](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools) (using "Visual C++ build tools" workload) or [Visual Studio 2017 Community](https://visualstudio.microsoft.com/pl/thank-you-downloading-visual-studio/?sku=Community) (using the "Desktop development with C++" workload)
+- Install [Python 2.7](https://www.python.org/downloads/) (`v3.x.x` is not supported), and run `npm config set python python2.7` (or see below for further instructions on specifying the proper Python version and path.)
+- Launch cmd, `npm config set msvs_version 2017`
+
+If the above steps didn't work for you, please visit [Microsoft's Node.js Guidelines for Windows](https://github.com/Microsoft/nodejs-guidelines/blob/master/windows-environment.md#compiling-native-addon-modules) for additional tips.
+
+To target native ARM64 Node.js on Windows 10 on ARM, add the  components "Visual C++ compilers and libraries for ARM64" and "Visual  C++ ATL for ARM64".
+
+## Usage
+
+To use the connector, first request the library ```td-connector```. Running the function ```taos.connect``` with the connection options passed in as an object will return a TDengine connection object. A cursor needs to be intialized in order to interact with TDengine from node.
+
+```javascript
+const taos = require('td-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
+```
+
+We can now start executing queries through the ```cursor.execute``` function.
+
+```javascript
+c1.execute('show databases;')
+```
+
+We can get the results of the queries by doing the following
+
+```javascript
+var data = c1.fetchall();
+console.log(c1.fieldNames); // Returns the names of the columns/fields
+console.log(data); // Logs all the data from the query as an array of arrays, each of which represents a row and data[row_number] is sorted in order of the fields
+```
+
+## Example
+
+The following is an example use of the connector showing how to make a table with weather data, insert random data, and then retrieve it.
+
+```javascript
+// Get the td-connector package
+const taos = require('td-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 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.fieldNames stores the names of each column retrieved
+  console.log(c1.fieldNames);
+  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.fieldNames);
+  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!
+
+```
+
+## Contributing to TDengine
+
+Please follow the [contribution guidelines](https://github.com/taosdata/TDengine/blob/master/CONTRIBUTING.md) to contribute to the project.
+
+## License
+
+[GNU AGPL v3.0](http://www.gnu.org/licenses/agpl-3.0.html)
\ No newline at end of file

src/connector/nodejs/tdengine.js

+var TDengineConnection = require('./nodetaos/connection.js')
+module.exports.connect = function (connection=null) {
+  return new TDengineConnection(connection);
+}

src/connector/nodejs/test/test.js

+const taos = require('td-connector');
+var conn = taos.connect({host:"127.0.0.1", user:"root", password:"taosdata", config:"/etc/taos",port:0});
+var c1 = conn.cursor();
+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) + "\"";
+}
+function R(l,r) {
+  return Math.random() * (r - l) - r;
+}
+function randomBool() {
+  if (Math.random() <  0.5) {
+    return true;
+  }
+  return false;
+}
+c1.execute('create database td_connector_test;');
+c1.execute('use td_connector_test;')
+c1.execute('create table if not exists all_types (ts timestamp, _int int, _bigint bigint, _float float, _double double, _binary binary(40), _smallint smallint, _tinyint tinyint, _bool bool, _nchar nchar(40));');
+
+for (let i = 0; i < 10000; i++) {
+  stime.setMilliseconds(stime.getMilliseconds() + interval);
+  let insertData = [convertDateToTS(stime), // Timestamp
+                    parseInt( R(-Math.pow(2,31) + 1 , Math.pow(2,31) - 1) ), // Int
+                    parseInt( R(-Math.pow(2,31) + 1 , Math.pow(2,31) - 1) ), // BigInt
+                    parseFloat( R(-3.4E38, 3.4E38) ), // Float
+                    parseFloat( R(-1.7E308, 1.7E308) ), // Double
+                    "\"Long Binary\"", // Binary
+                    parseInt( R(-32767, 32767) ), // Small Int
+                    parseInt( R(-127, 127) ), // Tiny Int
+                    randomBool(),
+                    "\"Nchars 一些中文字幕\""]; // Bool
+  c1.execute('insert into td_connector_test.all_types values(' + insertData.join(',') + ' );');
+}
+
+c1.execute('select * from td_connector_test.all_types limit 10 offset 1000;');
+var d = c1.fetchall();
+console.log(c1.fieldNames);
+console.log(d);
+
+c1.execute('select count(*), avg(_int), sum(_float), max(_bigint), min(_double) from td_connector_test.all_types;');
+var d = c1.fetchall();
+console.log(c1.fieldNames);
+console.log(d);
+
+c1.execute('drop database td_connector_test;')
+
+conn.close();

tests/examples/nodejs/node-example.js

+// Get the td-connector package
+const taos = require('td-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 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.fieldNames stores the names of each column retrieved
+  console.log(c1.fieldNames);
+  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.fieldNames);
+  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!