[TD-14523]<docs>: add R and Matlab support (#11254)

* [TD-14523]<docs>: add R and Matlab support

* corrected according to xiaolei's comments

* adjust load library

documentation20/cn/09.connections/docs.md

@@ -93,3 +93,94 @@ GF_PLUGINS_ALLOW_LOADING_UNSIGNED_PLUGINS=tdengine-datasource
 
 在 2.3.3.0 及以上版本，您可以导入 TDinsight Dashboard (Grafana Dashboard ID： [15167](https://grafana.com/grafana/dashboards/15167)) 作为 TDengine 集群的监控可视化工具。安装和使用说明请见 [TDinsight 用户手册](https://www.taosdata.com/cn/documentation/tools/insight)。
 
+## <a class="anchor" id="matlab"></a>Matlab
+
+MatLab 可以通过安装包内提供的 JDBC Driver 直接连接到 TDengine 获取数据到本地工作空间。
+
+### MatLab 的 JDBC 接口适配
+
+MatLab 的适配有下面几个步骤，下面以 Windows10 上适配 MatLab2017a 为例：
+
+- 从 (maven.org)[https://repo1.maven.org/maven2/com/taosdata/jdbc/taos-jdbcdriver/] 或其他 maven 镜像网站下载 TDengine JDBC 驱动程序 JDBCDriver-x.x.x-dist.jar 拷贝到 ${matlab_root}\MATLAB\R2017a\java\jar\toolbox
+- 将 TDengine 安装包内的 taos.lib 文件拷贝至${matlab_ root _dir}\MATLAB\R2017a\lib\win64
+- 将新添加的驱动 jar 包加入 MatLab 的 classpath。在 ${matlab_ root _dir}\MATLAB\R2017a\toolbox\local\classpath.txt 文件中添加下面一行
+
+```
+$matlabroot/java/jar/toolbox/JDBCDriver-x.x.x-dist.jar
+```
+
+- 在${user_home}\AppData\Roaming\MathWorks\MATLAB\R2017a\下添加一个文件 javalibrarypath.txt, 并在该文件中添加 taos.dll 的路径，比如您的 taos.dll 是在安装时拷贝到了 C:\Windows\System32 下，那么就应该在 javalibrarypath.txt 中添加如下一行：
+
+```
+C:\Windows\System32
+```
+
+### 在 MatLab 中连接 TDengine 获取数据
+
+在成功进行了上述配置后，打开 MatLab。
+
+- 创建一个连接：
+
+```matlab
+conn = database(‘db’, ‘root’, ‘taosdata’, ‘com.taosdata.jdbc.TSDBDriver’, ‘jdbc:TSDB://127.0.0.1:0/’)
+```
+
+- 执行一次查询：
+
+```matlab
+sql0 = [‘select * from tb’]
+data = select(conn, sql0);
+```
+
+- 插入一条记录:
+
+```matlab
+sql1 = [‘insert into tb values (now, 1)’]
+exec(conn, sql1)
+```
+
+更多例子细节请参考安装包内 examples\Matlab\TDengineDemo.m 文件。
+
+## <a class="anchor" id="r"></a>R
+
+R 语言支持通过 JDBC 接口来连接 TDengine 数据库。首先需要安装 R 语言的 JDBC 包，下载 RJDBC 的时候，还会自动下载 RJDBC 依赖的 DBI 和 rJava 这两个package。启动 R 语言环境，然后执行以下命令安装 R 语言的 JDBC 支持库：
+
+```R
+install.packages('RJDBC', repos='http://cran.us.r-project.org')
+```
+
+安装完成以后，通过执行`library()`命令加载 DBI、rJava 和 _RJDBC_ 包：
+
+```R
+library('DBI')
+library('rJava')
+library('RJDBC')
+```
+
+然后加载 TDengine 的 JDBC 驱动：
+
+```R
+drv<-JDBC("com.taosdata.jdbc.TSDBDriver","JDBCDriver-2.0.0-dist.jar", identifier.quote="\"")
+```
+
+如果执行成功，不会出现任何错误信息。之后通过以下命令尝试连接数据库：
+
+```R
+conn<-dbConnect(drv,"jdbc:TSDB://127.0.0.1:0/?user=root&password=taosdata","root","taosdata")
+```
+
+也可以使用 RESTful 来连接 TDengine。
+
+```R
+conn<-dbConnect(drv,"jdbc:TAOS-RS://127.0.0.1:6041/test?user=root&password=taosdata","root","taosdata")
+```
+
+注意将上述命令中的IP地址替换成正确的IP地址。如果没有任务错误的信息，则连接数据库成功，否则需要根据错误提示调整连接的命令。TDengine 支持以下的 _RJDBC_ 包中函数：
+
+-	dbWriteTable(conn, "test", iris, overwrite=FALSE, append=TRUE)：将数据框 iris 写入表 test 中，overwrite 必须设置为 false，append 必须设为 TRUE，且数据框 iris 要与表 test 的结构一致。
+-	dbGetQuery(conn, "select count(*) from test")：查询语句
+-	dbSendUpdate(conn, "use db")：执行任何非查询 SQL 语句。例如 dbSendUpdate(conn, "use db")， 写入数据 dbSendUpdate(conn, "insert into t1 values(now, 99)") 等。
+-	dbReadTable(conn, "test")：读取表 test 中数据
+-	dbDisconnect(conn)：关闭连接
+-	dbRemoveTable(conn, "test")：删除表 test
+

documentation20/en/09.connections/docs.md

@@ -101,16 +101,17 @@ MATLAB can access data to the local workspace by connecting directly to the TDen
 
 Several steps are required to adapt MATLAB to TDengine. Taking adapting MATLAB2017a on Windows10 as an example:
 
-- Copy the file JDBCDriver-1.0.0-dist.jar in TDengine package to the directory ${matlab_root}\MATLAB\R2017a\java\jar\toolbox
-- Copy the file taos.lib in TDengine package to ${matlab root dir}\MATLAB\R2017a\lib\win64
+- Please download TDengine JDBC driver dist jar file from (maven.org)[https://repo1.maven.org/maven2/com/taosdata/jdbc/taos-jdbcdriver/] or other maven.org's mirrors site and copy it to the directory ${matlab_root}\MATLAB\R2017a\java\jar\toolbox
+- Copy the file taos.lib from TDengine installation package to ${matlab root dir}\MATLAB\R2017a\lib\win64
 - Add the .jar package just copied to the MATLAB classpath. Append the line below as the end of the file of ${matlab root dir}\MATLAB\R2017a\toolbox\local\classpath.txt
 
-- ```
-  $matlabroot/java/jar/toolbox/JDBCDriver-1.0.0-dist.jar
+  ```
+  $matlabroot/java/jar/toolbox/JDBCDriver-x.x.x-dist.jar
   ```
 
 - Create a file called javalibrarypath.txt in directory ${user_home}\AppData\Roaming\MathWorks\MATLAB\R2017a_, and add the _taos.dll path in the file. For example, if the file taos.dll is in the directory of C:\Windows\System32，then add the following line in file javalibrarypath.txt:
-- ```
+
+  ```
   C:\Windows\System32
   ```
 
@@ -142,13 +143,19 @@ For more detailed examples, please refer to the examples\matlab\TDengineDemo.m f
 
 ## <a class="anchor" id="r"></a> R
 
-R language supports connection to the TDengine database through the JDBC interface. First, you need to install the JDBC package of R language. Launch the R language environment, and then execute the following command to install the JDBC support library for R language:
+R language supports connection to the TDengine database through the JDBC interface. First, you need to install the JDBC package of R language. Its dependencies such as DBI and rJava will be automatically downloaded too. Launch the R language environment, and then execute the following command to install the JDBC support library for R language:
 
 ```R
 install.packages('RJDBC', repos='http://cran.us.r-project.org')
 ```
 
-After installed, load the RJDBC package by executing `library('RJDBC')` command.
+After installed, load the DBI, rJava and RJDBC package by executing `library()` command.
+
+```R
+library('DBI')
+library('rJava')
+library('RJDBC')
+```
 
 Then load the TDengine JDBC driver:
 
@@ -159,7 +166,13 @@ drv<-JDBC("com.taosdata.jdbc.TSDBDriver","JDBCDriver-2.0.0-dist.jar", identifier
 If succeed, no error message will display. Then use the following command to try a database connection:
 
 ```R
-conn<-dbConnect(drv,"jdbc:TSDB://192.168.0.1:0/?user=root&password=taosdata","root","taosdata")
+conn<-dbConnect(drv,"jdbc:TSDB://127.0.0.1:0/?user=root&password=taosdata","root","taosdata")
+```
+
+Or you can use the RESTful interface to access TDengine.
+
+```R
+conn<-dbConnect(drv,"jdbc:TAOS-RS://127.0.0.1:6041/test?user=root&password=taosdata","root","taosdata")
 ```
 
 Please replace the IP address in the command above to the correct one. If no error message is shown, then the connection is established successfully, otherwise the connection command needs to be adjusted according to the error prompt. TDengine supports below functions in *RJDBC* package:
@@ -171,7 +184,3 @@ Please replace the IP address in the command above to the correct one. If no err
 - `dbDisconnect(conn)`: close a connection
 - `dbRemoveTable(conn, "test")`: remove table test
 
-The functions below are not supported currently:
-
-- `dbExistsTable(conn, "test")`: if table test exists
-- `dbListTables(conn)`: list all tables in the connection