91 lines
3.9 KiB
Plaintext
91 lines
3.9 KiB
Plaintext
---
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sidebar_label: OpenTSDB Line Protocol
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title: OpenTSDB Line Protocol
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---
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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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import JavaTelnet from "./_java_opts_telnet.mdx";
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import PyTelnet from "./_py_opts_telnet.mdx";
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import GoTelnet from "./_go_opts_telnet.mdx";
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import RustTelnet from "./_rust_opts_telnet.mdx";
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import NodeTelnet from "./_js_opts_telnet.mdx";
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import CsTelnet from "./_cs_opts_telnet.mdx";
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import CTelnet from "./_c_opts_telnet.mdx";
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## Introduction
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A single line of text is used in OpenTSDB line protocol to represent one row of data. OpenTSDB employs a single column data model, so each line can only contain a single data column. There can be multiple tags. Each line contains 4 parts as below:
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```txt
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<metric> <timestamp> <value> <tagk_1>=<tagv_1>[ <tagk_n>=<tagv_n>]
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```
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- `metric` will be used as the STable name.
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- `timestamp` is the timestamp of current row of data. The time precision will be determined automatically based on the length of the timestamp. Second and millisecond time precision are supported.
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- `value` is a metric which must be a numeric value, The corresponding column name is "value".
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- The last part is the tag set separated by spaces, all tags will be converted to NCHAR type automatically.
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For example:
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```txt
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meters.current 1648432611250 11.3 location=California.LosAngeles groupid=3
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```
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- The child table name is created automatically in a rule to guarantee its uniqueness. But you can configure `smlChildTableName` in taos.cfg to specify a tag value as the table names if the tag value is unique globally. For example, if a tag is called `tname` and you set `smlChildTableName=tname` in taos.cfg, when you insert `st,tname=cpu1,t1=4 c1=3 1626006833639000000`, the child table `cpu1` will be automatically created. Note that if multiple rows have the same tname but different tag_set values, the tag_set of the first row is used to create the table and the others are ignored.
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Please refer to [OpenTSDB Telnet API](http://opentsdb.net/docs/build/html/api_telnet/put.html) for more details.
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## Examples
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<Tabs defaultValue="java" groupId="lang">
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<TabItem label="Java" value="java">
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<JavaTelnet />
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</TabItem>
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<TabItem label="Python" value="Python">
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<PyTelnet />
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</TabItem>
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<TabItem label="Go" value="go">
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<GoTelnet />
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</TabItem>
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<TabItem label="Node.js" value="nodejs">
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<NodeTelnet />
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</TabItem>
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<TabItem label="C#" value="csharp">
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<CsTelnet />
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</TabItem>
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<TabItem label="C" value="c">
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<CTelnet />
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</TabItem>
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</Tabs>
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2 STables will be created automatically and each STable has 4 rows of data in the above sample code.
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```cmd
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taos> use test;
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Database changed.
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taos> show stables;
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name |
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=================================
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meters.current |
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meters.voltage |
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Query OK, 2 row(s) in set (0.002544s)
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taos> select tbname, * from `meters.current`;
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tbname | _ts | _value | groupid | location |
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==================================================================================================================================
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t_0e7bcfa21a02331c06764f275... | 2022-03-28 09:56:51.249 | 10.800000000 | 3 | California.LosAngeles |
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t_0e7bcfa21a02331c06764f275... | 2022-03-28 09:56:51.250 | 11.300000000 | 3 | California.LosAngeles |
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t_7e7b26dd860280242c6492a16... | 2022-03-28 09:56:51.249 | 10.300000000 | 2 | California.SanFrancisco |
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t_7e7b26dd860280242c6492a16... | 2022-03-28 09:56:51.250 | 12.600000000 | 2 | California.SanFrancisco |
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Query OK, 4 row(s) in set (0.005399s)
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```
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## Query Examples
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If you want query the data of `location=California.LosAngeles groupid=3`，here is the query SQL:
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```sql
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SELECT * FROM `meters.current` WHERE location = "California.LosAngeles" AND groupid = 3;
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```
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