influxdb使用命令实现crud操作

Posted 2021-05-25 健康平安的活着

一 实现crud操作

1.1 登录数据库模式

[root@192 influxdb]# influx -username influxdb-jurf -password 'jurf-123'
Connected to http://localhost:8086 version 1.7.9
InfluxDB shell version: 1.7.9

1.2 创建数据库

> show databases;
name: databases
name
----
_internal
> create database huidian_db
> show databases;
name: databases
name
----
_internal
huidian_db
> use huidian_db
Using database huidian_db

1.3 创建表并插入数据

> insert hd_tb,name=beijing  scoreval=789.56
> show measurements;
name: measurements
name
----
hd_tb
> select * from hd_tb;
name: hd_tb
time                name    scoreval
----                ----    --------
1621767933327483214 beijing 789.56
> insert hd_tb,name=beijing,age=12,sex='男'  scoreval=789.564
> select * from hd_tb;
name: hd_tb
time                age name    scoreval sex
----                --- ----    -------- ---
1621767933327483214     beijing 789.56   
1621768625997578434 12  beijing 789.564  '男'

1.4 保护策略

1.4.1 查看保护策略

> show retention policies on huidian_db
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        true

1.4.2 创建新的保护策略

> create retention policy "7hours" on huidian_db  duration 7h replication 1 default
> show retention policies on huidian_db
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
7hours  7h0m0s   1h0m0s             1        true

1.4.3  修改保护策略

> alter retention policy "7hours" on huidian_db  duration 2w replication 1 default
> show retention policies on huidian_db
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
7hours  336h0m0s 1h0m0s             1        true

1.4.4  查看数据

因为之前插入数据是在autogen这种永久的保护策略下，现在改为了7hours，查询数据时将没有数据，只能以select * from “策略名”.表名  这个中格式进行查询，如下图

> select * from hd_tb;
> select * from "hd_tb".autogen;
ERR: retention policy not found: hd_tb
> select * from "autogen".hd_tb;
name: hd_tb
time                age name    scoreval sex
----                --- ----    -------- ---
1621767933327483214     beijing 789.56   
1621768625997578434 12  beijing 789.564  '男'

1.4 查询语句

> select * from hd_tb where "name"='henan'
name: hd_tb
time                           age name  scoreval sex
----                           --- ----  -------- ---
2021-05-23T12:26:12.872846386Z 67  henan 8        'nv'

> select * from "hd_tb" where sex='nv'
name: hd_tb
time                           age name  scoreval sex
----                           --- ----  -------- ---
2021-05-23T12:32:47.158042046Z 67  henan 8        nv