测试数据
RESTful Connector
是最简单的远程连接方式,跨平台、无需安装任何客户端,直接发起 HTTP
请求即可
TDengine
通过 HTTP POST
请求 BODY
中包含的 SQL
语句来操作数据库,仅需要一个 URL
,以下是在 Ubuntu
操作系统上使用 curl
发送 HTTP
请求来体验
RESTful Connector
默认使用6041(实际取值是 serverPort + 11,因此可以通过修改 serverPort 参数的设置来修改)端口通信,所以在服务器端需要开放6041的TCP端口
http://<fqdn>:<port>/rest/sql/[db_name]
- fqnd: 集群中的任一台主机 FQDN 或 IP 地址
- port: 配置文件中 httpPort 配置项,缺省为 6041
- db_name: 可选参数,指定本次所执行的 SQL 语句的默认数据库库名。(从 2.2.0.0 版本开始支持)
HTTP 请求的 Header 里需带有身份认证信息,TDengine 支持 Basic 认证与自定义认证两种机制,后续版本将提供标准安全的数字签名机制来做身份验证
curl -d 'select * from temperature' 1.14.252.45:6041/rest/sql/test
{
"code": 4357,
"desc": "no auth info input",
"status": "error"
}
格式:
curl -H 'Authorization: Basic <TOKEN>' -d '<SQL>' <ip>:<PORT>/rest/sql/[db_name]
或者:
curl -u username:password -d '<SQL>' <ip>:<PORT>/rest/sql/[db_name]
其中,TOKEN
为 {username}:{password}
经过 Base64 编码之后的字符串,例如 root:root
编码后为 cm9vdDpyb290
curl -u root:root -d 'select * from temperature' 1.14.252.45:6041/rest/sql/test
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'select * from temperature' 1.14.252.45:6041/rest/sql/test
查询结果:
{"status":"succ","head":["ts","temperature","location","tbindex"],"column_meta":[["ts",9,8],["temperature",6,4],["location",10,64],["tbindex",4,4]],"data":[["2020-11-10 08:00:22.222",1.10000,"北京",0],["2020-11-10 08:00:22.223",1.20000,"北京",0],["2020-11-10 16:00:00.000",34.16116,"北京",0],["2020-11-10 16:00:00.000",9.75780,"上海",1],["2020-11-10 16:00:00.000",36.83972,"广州",2],["2020-11-10 16:00:00.000",41.21980,"深圳",3],["2020-11-10 16:00:00.000",12.89832,"北京",4],["2020-11-10 16:00:00.000",10.07183,"北京",5],["2020-11-10 16:00:00.000",6.91456,"广州",6],["2020-11-10 16:00:00.000",45.11603,"广州",7],["2020-11-10 16:00:00.000",17.71194,"上海",8],["2020-11-10 16:00:00.000",26.36280,"北京",9]],"rows":12}
HTTP 请求中需要带有授权码 <TOKEN>
,用于身份识别。授权码通常由管理员提供,可简单的通过发送 HTTP GET
请求来
curl http://<fqnd>:<port>/rest/login/<username>/<password>
获取授权码示例:
curl http://1.14.252.45:6041/rest/login/root/root
返回值:
{
"code": 0,
"desc": "/KfeAzX/f9na8qdtNZmtONryp201ma04/KfeAzX/f9na8qdtNZmtONryp201ma04",
"status": "succ"
}
使用示例:
curl -H 'Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04/KfeAzX/f9na8qdtNZmtONryp201ma04' -d 'select * from temperature' 1.14.252.45:6041/rest/sql/test
{
"status": "succ",
"head": ["ts","current", …],
"column_meta": [["ts",9,8],["current",6,4], …],
"data": [
["2018-10-03 14:38:05.000", 10.3, …],
["2018-10-03 14:38:15.000", 12.6, …]
],
"rows": 2
}
参数说明:
["current",6,4]
表示列名为“current”;列类型为 6,也即 float 类型;类型长度为 4,也即对应 4 个字节表示的 float。如果列类型为 binary 或 nchar,则类型长度表示该列最多可以保存的内容长度,而不是本次返回值中的具体数据长度。当列类型是 nchar 的时候,其类型长度表示可以保存的 unicode 字符数量,而不是 bytescolumn_meta 中的列类型说明:
curl -H 'Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04/KfeAzX/f9na8qdtNZmtONryp201ma04' -d 'select * from temperature' 1.14.252.45:6041/rest/sql/test
或者:
curl -H 'Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04/KfeAzX/f9na8qdtNZmtONryp201ma04' -d 'select * from test.temperature' 1.14.252.45:6041/rest/sql
HTTP 请求的 BODY 里就是一个完整的 SQL 语句,SQL 语句中的数据表应提供数据库前缀,例如 test.temperature(test是数据库名,temperature是超级表名)。如果表名不带数据库前缀,又没有在 url 中指定数据库名的话,系统会返回错误。因为 HTTP 模块只是一个简单的转发,没有当前 DB 的概念
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'create database demo' 1.14.252.45:6041/rest/sql
返回值:
{"status":"succ","head":["affected_rows"],"column_meta":[["affected_rows",4,4]],"data":[[0]],"rows":1}
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'CREATE STABLE meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int)' 1.14.252.45:6041/rest/sql/demo
创建表时,需要提供表名(示例中为 meters),表结构 Schema,即数据列的定义。第一列必须为时间戳(示例中为 ts),其他列为采集的物理量(示例中为 current, voltage, phase),数据类型可以为整型、浮点型、字符串等。除此之外,还需要提供标签的 schema (示例中为 location, groupId),标签的数据类型可以为整型、浮点型、字符串等
一张超级表最多容许 1024 列,如果一个采集点采集的物理量个数超过 1024,需要建多张超级表来处理。一个系统可以有多个 DB,一个 DB 里可以有一到多个超级表。(从 2.1.7.0 版本开始,列数限制由 1024 列放宽到了 4096 列。)
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'CREATE TABLE d1001 USING meters TAGS ("Beijing.Chaoyang", 2)' 1.14.252.45:6041/rest/sql/demo
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'INSERT INTO d1002 USING meters TAGS ("Beijng.Chaoyang", 2) VALUES (now, 10.2, 219, 0.32)' 1.14.252.45:6041/rest/sql/demo
# 写入一条数据
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'INSERT INTO d1001 VALUES (1538548685000, 10.3, 219, 0.31)' 1.14.252.45:6041/rest/sql/demo
# 一次性写入多条数据
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'INSERT INTO d1001 VALUES (1538548684000, 10.2, 220, 0.23) (1538548696650, 10.3, 218, 0.25)' 1.14.252.45:6041/rest/sql/demo
# 向多个表写入数据
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'INSERT INTO d1001 VALUES (1538548685000, 10.3, 219, 0.31) (1538548695000, 12.6, 218, 0.33) d1002 VALUES (1538548696800, 12.3, 221, 0.31)' 1.14.252.45:6041/rest/sql/demo
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'select * from demo.d1001' 1.14.252.45:6041/rest/sqlt
查询结果:
{
"status": "succ",
"head": ["ts","current","voltage","phase"],
"column_meta": [["ts",9,8],["current",6,4],["voltage",4,4],["phase",6,4]],
"data": [
[1538548684000,10.20000,220,0.23000],
[1538548685000,10.30000,219,0.31000]
],
"rows": 2
}
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'select * from demo.d1001' 1.14.252.45:6041/rest/sqlutc
查询结果:
{
"status": "succ",
"head": ["ts","current","voltage","phase"],
"column_meta": [["ts",9,8],["current",6,4],["voltage",4,4],["phase",6,4]],
"data": [
["2018-10-03T06:38:04.000+0000",10.20000,220,0.23000],
["2018-10-03T06:38:05.000+0000",10.30000,219,0.31000]
],
"rows": 2
}
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'drop table if exists temperature' 1.14.252.45:6041/rest/sql/test
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'drop table if exists d1001' 1.14.252.45:6041/rest/sql/demo
curl -H 'Authorization: Basic cm9vdDpyb290' -d 'drop database test' 1.14.252.45:6041/rest/sql
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原文链接 : https://blog.csdn.net/weixin_43296313/article/details/124151070
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