mysql，mycat的demo

時間 2019-12-10

標籤 mysql mycat demo 欄目 MySQL 简体版

原文原文鏈接

一直都是使用公司架構師提供的mycat，今天得空本身嘗試瞭如下：java

1.首先安裝jdk（官網建議1.7及以上版本），mysql（我安裝的是5.7.19-0ubuntu0.16.04.1，設置帳號密碼爲root，123456，與mycat保持一致，後面避免修改配置文件），mycat（我安裝的是Mycat-server-1.6-RELEASE-20161028204710-linux.tar）；node

以上可直接去官網下載；mysql

2.建立三個數據庫，暫且名稱定爲db1,db2,db3，與mycat的配置一致，省去了修改被指文件的工做；linux

3.啓動mysql，啓動mycat，分別查看是否啓動成功，若是啓動mycat時報錯，java.net.MalformedURLException，應該是由於主機名沒有綁定，能夠去配置文件/etc/hosts種在127.0.0.1 後面增長主機名，在啓動mycat應該就不會報錯了；sql

4.執行命令：mysql -uroot -p123456 -h127.0.0.1 -P8066 -DTESTDB,進入mycat命令行界面；數據庫

建立Travelrecord表：ubuntu

create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);

插入數據服務器

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10);
Query OK, 1 row affected (0.00 sec)

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10);
Query OK, 1 row affected (0.00 sec)

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10);
Query OK, 1 row affected (0.00 sec)

至於ID爲何取三個值，這個與conf目錄下autopartition-long.txt的定義有關，這個文件主要定義auto-sharding-long的規則。架構

# range start-end ,data node index
# K=1000,M=10000.
0-500M=0
500M-1000M=1
1000M-1500M=2

下面來看看分片的效果：

mysql> select * from db1.travelrecord;
+----+---------+------------+------+------+
| id | user_id | traveldate | fee  | days |
+----+---------+------------+------+------+
|  1 | Victor  | 2016-01-01 |  100 |   10 |
+----+---------+------------+------+------+
row in set (0.00 sec)

mysql> select * from db2.travelrecord;
+---------+---------+------------+------+------+
| id      | user_id | traveldate | fee  | days |
+---------+---------+------------+------+------+
| 5000001 | Job     | 2016-01-02 |  100 |   10 |
+---------+---------+------------+------+------+
row in set (0.00 sec)

mysql> select * from db3.travelrecord;
+----------+---------+------------+------+------+
| id       | user_id | traveldate | fee  | days |
+----------+---------+------------+------+------+
| 10000001 | Slow    | 2016-01-03 |  100 |   10 |
+----------+---------+------------+------+------+
row in set (0.00 sec)

若是想看MyCAT具體會將數據分配到哪一個節點上，可經過路由分析。語法其實蠻簡單，就是SQL語句前加上explain語句。spa

mysql> explain create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);
+-----------+-----------------------------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                                                   |
+-----------+-----------------------------------------------------------------------------------------------------------------------+
| dn1       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
| dn2       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
| dn3       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
+-----------+-----------------------------------------------------------------------------------------------------------------------+
rows in set (0.00 sec)

mysql>  explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10);
+-----------+----------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                          |
+-----------+----------------------------------------------------------------------------------------------+
| dn1       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10) |
+-----------+----------------------------------------------------------------------------------------------+
row in set (0.01 sec)

mysql> explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10);
+-----------+-------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                             |
+-----------+-------------------------------------------------------------------------------------------------+
| dn2       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10) |
+-----------+-------------------------------------------------------------------------------------------------+
row in set (0.00 sec)

mysql> explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10);
+-----------+---------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                               |
+-----------+---------------------------------------------------------------------------------------------------+
| dn3       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10) |
+-----------+---------------------------------------------------------------------------------------------------+
row in set (0.00 sec)