安装C++ influxdb环境

📦仓库：GitHub - orca-zhang/influxdb-cpp: 💜 C++ client for InfluxDB.

直接将influxdb.hpp放到工程src/中，并引用该头文件即可，非常方便

连接并读取influxdb数据库

连接

influxdb_cpp::server_info insense("127.0.0.1", 8086, "test", "username", "password");

读取

string resp;
influxdb_cpp::query(resp, "select * from table_name limit 100", insense);
std::cout << resp << std::endl;

写入influxdb数据库

连接

influxdb_cpp::server_info insense("127.0.0.1", 8086, "test", "invix", "invix");

写入

influxdb_cpp::builder()
    .meas("final_cost")
    .field("cost", final_cost)
    .post_http(insense);

一些概念
influxdb中 连接里的是database，写入的是measurement

CRUD API

Install Database

wget https://dl.influxdata.com/influxdb/releases/influxdb_1.7.7_amd64.deb
sudo dpkg -i influxdb_1.7.7_amd64.deb

Config Database

influxd  --启动数据库
CREATE DATABASE "testDB"  --创建数据库
CREATE USER <username> WITH PASSWORD '<password>' WITH ALL PRIVILEGES --创建用户
show retention policies on "db_name" --查看当前数据库Retention Policies
alter retention policy "rp_name" on "db_name" duration 30d default --修改Retention Policies
drop retention policy "rp_name" on "db_name"  --删除Retention Policies

Create database and use database

CREATE DATABASE "testDB"  --创建数据库
show databases  --展示所有数据库
use test 使用  --数据库

Query table

SHOW MEASUREMENTS --查询当前数据库表
SHOW FIELD KEY  --查看数据表字段
SHOW series from key  查看key值
SHOW TAG KEYS from "KEY" --查看key中tag key值

Query records

SELECT * FROM /.*/ LIMIT 1 --查询当前数据库下所有表的第一行

SELECT * FROM xx ORDER BY xx DESC limit 2

DELETE FROM "table_name" (delete table and all its data)

DROP MEASUREMENT "table_name" (table is dropped but data is remain)

DELETE FROM cpu WHERE time < '2000-01-01T00:00:00Z'

DELETE WHERE time < '2000-01-01T00:00:00Z'
DROP DATABASE “testDB” --删除数据库

DROP RETENTION POLICY "dbbak" ON mydb --删除保留数据为dbbak数据

DROP SERIES from pay where tag_key='' --删除key中的tag