docs: preview connector code

docs-en/05-develop/01-connect/01-python.md

@@ -15,16 +15,15 @@ You'll need to have Python3 installed.
 
 ## Config
 
-Run this command in your terminal to save your URL and token as variables:
+Run this command in your terminal to save TDengine cloud token as variables:
 
 ```bash
-export TDENGINE_CLOUD_URL=<URL>
-export TDENGINE_CLOUD_TOKEN=<token>
+export TDENGINE_TOKEN=<token>
 ```
 
 <!-- exclude -->
 :::note
-You should replace above placeholders as real values. To obtain these values, please log in TDengine Cloud and switch to "Connector" section.
+To obtain cloud token, please log in TDengine Cloud and switch to "Connector" section.
 
 :::
 <!-- exclude-end -->
@@ -37,8 +36,8 @@ Copy code bellow to your editor and run it with `python3` command.
 import taosrest
 import os
 
-url = os.environ["TDENGINE_CLOUD_URL"]
-token = os.environ["TDENGINE_CLOUD_TOKEN"]
+token = os.environ["TDENGINE_TOKEN"]
+url = "https://cloud.tdengine.com"
 
 conn = taosrest.connect(url=url, token=token)
 ```

docs-en/05-develop/01-connect/02-java.md

@@ -25,35 +25,29 @@ dependencies {
 
 ## Config
 
-Run this command in your terminal to save your url and token as variables:
+Run this command in your terminal to save TDengine cloud token as variables:
 
 
 ```bash
-export TDENGINE_CLOUD_URL=<url>
-export TDENGINE_CLOUD_TOKEN=<token>
+export TDENGINE_TOKEN=<token>
 ```
 
-<!-- exclude -->
-:::note
-You should replace above placeholders as real values. To obtain these values, please log in TDengine Cloud and switch to "Connector" section.
-
-:::
-<!-- exclude-end -->
-
 ## Connect
 
-Code bellow get URL and token from environment variables first and then create a `RestfulConnection` object, witch is a standard JDBC Connection object.
 
 ```java
-import com.taosdata.jdbc.rs.RestfulConnection;
 import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
 
 
 public class ConnectCloudExample {
-    public static void main(String[] args) throws Exception {
-        String url = System.getenv("TDENGINE_CLOUD_URL");
-        String token = System.getenv("TDENGINE_CLOUD_TOKEN");
-        Connection conn = new RestfulConnection(url, token);
+    public static void main(String[] args) throws SQLException {
+        String token = System.getenv("TDENGINE_TOKEN");
+        String jdbcUrl = "jdbc:TAOS-RS://cloud.taosdata.com:8085?usessl=true&token=" + token;
+        Connection conn = DriverManager.getConnection(jdbcUrl);
+        System.out.println("Connected");
+        conn.close();
     }
 }
 ```

docs-en/05-develop/01-connect/03-go.md

+---
+sidebar_label: Go
+title: Connect with Go Connector
+---
+
+## Add Dependency
+
+add `driver-go` dependency in `go.mod` .
+
+``` title="go.mod"
+module goexample
+
+go 1.17
+
+require github.com/taosdata/driver-go/v2 develop
+```
+
+## Config
+
+Run this command in your terminal to save TDengine cloud token as variables:
+
+```bash
+export TDENGINE_TOKEN=<token>
+```
+
+## Connect
+
+```go
+package main
+
+import (
+    "database/sql"
+    "fmt"
+    "os"
+
+    _ "github.com/taosdata/driver-go/v2/taosRestful"
+)
+
+func main() {
+    host := os.Getenv("TDENGIN_TOKEN")
+    taosDSN := "https://cloud.taosdata.com?token=" + token
+    taos, err := sql.Open("taosRestful", taosDSN)
+    if err != nil {
+        fmt.Println("failed to connect TDengine, err:", err)
+        return
+    }
+    fmt.Println("Connected")
+    defer taos.Close()
+}
+```
\ No newline at end of file

docs-en/05-develop/01-connect/04-rust.md

+---
+sidebar_label: Rust
+title: Connect with Rust Connector
+---
+
+## Add Dependency
+
+
+``` title="Cargo.toml"
+
+```
+
+## Config
+
+Run this command in your terminal to save TDengine cloud token as variables:
+
+```bash
+export TDENGINE_TOKEN=<token>
+```
+
+## Connect
+
+```go
+use libtaos::*;
+
+fn main() {
+    let token =  std::env::var("TDENGINE_TOKEN").unwrap();
+    let dsn = format!("https://cloud:tdengine.com?token={}", token);
+    let taos = Taos::from_dsn(dsn.as_str())?;
+}
+```
\ No newline at end of file

docs-en/05-develop/01-connect/05-node.md

+---
+sidebar_label: Node.js
+title: Connect with Node.js Connector
+---
+
+## Install Connector
+
+
+
+## Config
+
+Run this command in your terminal to save TDengine cloud token as variables:
+
+```bash
+export TDENGINE_TOKEN=<token>
+```
+
+
+## Connect
+
+
+```python
+const { options, connect } = require("td2.0-rest-connector");
+
+async function test() {
+  options.url = "https://cloud.tdengine.com";
+  options.token = process.env.TDENGIN_TOKEN;
+  let conn = connect(options);
+}
+test();
+```
+