Clickhouse Mysql數據導入

=====================方式一=====================

mysql表數據導入：

CREATE TABLE ck_chat 
ENGINE = MergeTree 
ORDER BY id AS 
SELECT * FROM mysql('localhost:3306', 'test', 'chat', 'root', 'yang156');

其中
    ck_chat：為clickhouse數據表
    test：為mysql數據庫名
    chat: 為mysql數據表名
    root ： 為mysql用戶名
    yang156：為mysql用戶密碼

FAQ：

1、如果出現Received exception from server (version 20.8.3):
Code: 1000. DB::Exception: Received from localhost:9000. DB::Exception: mysqlxx::ConnectionFailed: 
Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) ((nullptr):0). 

解決方法：
    a) more /etc/my.cnf |grep sock  #查看sock文件路徑: /var/lib/mysql/mysql.sock ,這個是我安裝mysql的sock的路徑
    b) ln -s /var/lib/mysql/mysql.sock  /tmp/mysql.sock

注意：這種方式是導入的這個時刻的數據存入clickhouse

 

=====================方式二=====================

mysql庫映射至Clickhouse(數據同步)

CREATE DATABASE mysql_db ENGINE = MySQL('localhost:3306', 'test', 'root', 'password')