Merge pull request #4707 from taosdata/hotfix/TD-2550

[TD-2550]<fix>: fix nodejs connector of td2.0-connector cannot use in…

src/connector/nodejs/nodetaos/cinterface.js

@@ -144,18 +144,9 @@ function convertBinary(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
 function convertNchar(data, num_of_rows, nbytes = 0, offset = 0, micro=false) {
   data = ref.reinterpret(data.deref(), nbytes * num_of_rows, offset);
   let res = [];
-  let currOffset = 0;
-  // every 4 bytes, a character is encoded;
-  while (currOffset < data.length) {
-    let dataEntry = data.slice(currOffset, currOffset + nbytes); //one entry in a row under a column;
-    if (dataEntry.readInt64LE(0) == FieldTypes.C_NCHAR_NULL) {
-      res.push(null);
-    }
-    else {
-      res.push(dataEntry.toString("utf16le").replace(/\u0000/g, ""));
-    }
-    currOffset += nbytes;
-  }
+  let dataEntry = data.slice(0, nbytes); //one entry in a row under a column;
+  //TODO: should use the correct character encoding 
+  res.push(dataEntry.toString("utf-8"));
   return res;
 }
 
@@ -351,7 +342,8 @@ CTaosInterface.prototype.useResult = function useResult(result) {
 CTaosInterface.prototype.fetchBlock = function fetchBlock(result, fields) {
   //let pblock = ref.ref(ref.ref(ref.NULL)); // equal to our raw data
   let pblock = this.libtaos.taos_fetch_row(result);
-  if (pblock == null) {
+  let num_of_rows = 1;
+  if (ref.isNull(pblock) == true) {
     return {block:null, num_of_rows:0};
   }
 
@@ -371,9 +363,8 @@ CTaosInterface.prototype.fetchBlock = function fetchBlock(result, fields) {
 
   let blocks = new Array(fields.length);
   blocks.fill(null);
-  num_of_rows = Math.abs(num_of_rows);
+  //num_of_rows = Math.abs(num_of_rows);
   let offset = 0;
-  pblock = pblock.deref();
   for (let i = 0; i < fields.length; i++) {
     pdata = ref.reinterpret(pblock,8,i*8);
     pdata = ref.ref(pdata.readPointer());

src/connector/nodejs/nodetaos/taosresult.js

@@ -25,6 +25,7 @@ function TaosResult(data, fields) {
  * @function pretty
  * @since 1.0.6
  */
+
 TaosResult.prototype.pretty = function pretty() {
   let fieldsStr = "";
   let sizing = [];
@@ -46,8 +47,7 @@ TaosResult.prototype.pretty = function pretty() {
     row.data.forEach((entry, i) => {
       if (this.fields[i]._field.type == 9) {
         entry = entry.toTaosString();
-      }
-      else {
+      } else {
         entry = entry == null ? 'null' : entry.toString();
       }
       rowStr += entry

src/connector/nodejs/test/test.js

@@ -48,6 +48,7 @@ for (let i = 0; i < 10000; i++) {
 // Select
 console.log('select * from td_connector_test.all_types limit 3 offset 100;');
 c1.execute('select * from td_connector_test.all_types limit 2 offset 100;');
+
 var d = c1.fetchall();
 console.log(c1.fields);
 console.log(d);
@@ -77,13 +78,24 @@ c1.query('select stddev(_double), stddev(_bigint), stddev(_float) from all_types
 })
 
 // Binding arguments, and then using promise
-var q = c1.query('select * from td_connector_test.all_types where ts >= ? and _int > ? limit 100 offset 40;').bind(new Date(1231), 100)
+var q = c1.query('select _nchar from td_connector_test.all_types where ts >= ? and _int > ? limit 100 offset 40;').bind(new Date(1231), 100)
 console.log(q.query);
 q.execute().then(function(r) {
   r.pretty();
 });
 
+var q = c1.query('select * from td_connector_test.weather');
+console.log(q.query);
+q.execute().then(function(r) {
+	//console.log(r);
+  	r.pretty();
+});
 
+function sleep(sleepTime) {
+    for(var start = +new Date; +new Date - start <= sleepTime; ) { }
+}
+
+sleep(10000);
 
 // Raw Async Testing (Callbacks, not promises)
 function cb2(param, result, rowCount, rd) {
@@ -129,16 +141,21 @@ setTimeout(function(){
   c1.fetchall_a(thisRes, cb4, param);
 },100);
 
+
 // Async through promises
 var aq = c1.query('select count(*) from td_connector_test.all_types;',false);
 aq.execute_a().then(function(data) {
   data.pretty();
 });
-c1.query('describe td_connector_test.stabletest;').execute_a().then(r=> r.pretty());
+
+c1.query('describe td_connector_test.stabletest').execute_a().then(function(r){
+	r.pretty()
+});
+
 setTimeout(function(){
   c1.query('drop database td_connector_test;');
 },200);
+
 setTimeout(function(){
   conn.close();
 },2000);
-