From f0db29ee214cd7713ac338a0c133244ca6a7c9fb Mon Sep 17 00:00:00 2001
From: dingbo <dingbo8128@163.com>
Date: Fri, 17 Jun 2022 10:57:35 +0800
Subject: [PATCH] docs: go and rust

---
 docs/en/05-develop/01-connect/04-rust.md     | 17 ++++++++---------
 docs/examples/go/connectexample/main.go      |  2 +-
 docs/examples/rust/cloud_example/Cargo.toml  |  3 ++-
 docs/examples/rust/cloud_example/src/main.rs | 15 +++++++++------
 4 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/docs/en/05-develop/01-connect/04-rust.md b/docs/en/05-develop/01-connect/04-rust.md
index 32a6c30095..95ba477050 100644
--- a/docs/en/05-develop/01-connect/04-rust.md
+++ b/docs/en/05-develop/01-connect/04-rust.md
@@ -17,7 +17,10 @@ Add dependency to `Cargo.toml`.
 
 ```toml title="Cargo.toml"
 [dependencies]
-libtaos = { version="*", feature=["rest"]}
+[dependencies]
+libtaos = { version="0.4.5-alpha.0", features=["rest"]}
+tokio = { version = "1", features = ["full"]}
+anyhow = "*"
 ```
 
 ## Config
@@ -28,24 +31,21 @@ Run this command in your terminal to save TDengine cloud token as variables:
 <TabItem value="bash" label="Bash">
 
 ```bash
-export TDENGINE_CLOUD_TOKEN="<token>"
-export TDENGINE_CLOUD_URL="<url>"
+export TDENGINE_CLOUD_DSN="<DSN>"
 ```
 
 </TabItem>
 <TabItem value="cmd" label="CMD">
 
 ```bash
-set TDENGINE_CLOUD_TOKEN="<token>"
-set TDENGINE_CLOUD_URL="<url>"
+set TDENGINE_CLOUD_DSN="<DSN>"
 ```
 
 </TabItem>
 <TabItem value="powershell" label="Powershell">
 
 ```powershell
-$env:TDENGINE_CLOUD_TOKEN="<token>"
-$env:TDENGINE_CLOUD_URL="<url>"
+$env:TDENGINE_CLOUD_DSN="<DSN>"
 ```
 
 </TabItem>
@@ -53,8 +53,7 @@ $env:TDENGINE_CLOUD_URL="<url>"
 
 <!-- exclude -->
 :::note
-Replace  <token\> and <url\> with cloud token and URL.
-To obtain the value of cloud token and URL, please log in [TDengine Cloud](https://cloud.tdengine.com) and click "Connector" and then select "Rust".
+Replace  <DSN\> with real TDengine cloud DSN. To obtain the real value, please log in [TDengine Cloud](https://cloud.tdengine.com) and click "Connector" and then select "Rust".
 
 :::
 <!-- exclude-end -->
diff --git a/docs/examples/go/connectexample/main.go b/docs/examples/go/connectexample/main.go
index 22d171d875..3a32425be3 100644
--- a/docs/examples/go/connectexample/main.go
+++ b/docs/examples/go/connectexample/main.go
@@ -16,7 +16,7 @@ func main() {
 		return
 	}
 	defer taos.Close()
-	rows, err := taos.Query("select server_version()")
+	rows, err := taos.Query("show databases")
 	if err != nil {
 		fmt.Println(err)
 		return
diff --git a/docs/examples/rust/cloud_example/Cargo.toml b/docs/examples/rust/cloud_example/Cargo.toml
index b4b2066b23..f9e1e54a65 100644
--- a/docs/examples/rust/cloud_example/Cargo.toml
+++ b/docs/examples/rust/cloud_example/Cargo.toml
@@ -7,5 +7,6 @@ edition = "2021"
 
 
 [dependencies]
-libtaos = { version="0.4.5-alpha.0", feature=["rest"]}
+libtaos = { version="0.4.5-alpha.0", features=["rest"]}
 tokio = { version = "1", features = ["full"]}
+anyhow = "*"
diff --git a/docs/examples/rust/cloud_example/src/main.rs b/docs/examples/rust/cloud_example/src/main.rs
index faeedff997..2019c38952 100644
--- a/docs/examples/rust/cloud_example/src/main.rs
+++ b/docs/examples/rust/cloud_example/src/main.rs
@@ -1,9 +1,12 @@
+use anyhow::Result;
 use libtaos::*;
 
-fn main() {
-    let token =  std::env::var("TDENGINE_CLOUD_TOKEN").unwrap();
-    let url = std::env::var("TDENGINE_CLOUD_URL").unwrap();
-    let dsn = url + "?token=" + &token;
-    let taos = TaosCfg::from_dsn(dsn)?;
-    println!("connected");
+#[tokio::main]
+async fn main() -> Result<()> {
+    let dsn = std::env::var("TDENGINE_CLOUD_DSN").unwrap();
+    let cfg = TaosCfg::from_dsn(dsn)?;
+    let conn = cfg.connect()?;
+    let _ = conn.query("show databases").await?;
+    println!("Connected");
+    Ok(())
 }
\ No newline at end of file
-- 
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