Mycat之——Mycat与MySQL 8.x互连

本文教你如何实现Mycat与MySQL 8.x互连,也就是说实现Mycat连接MySQL 8.x数据库,同时,实现使用MySQL 8.x的命令行连接Mycat。

1.创建MySQL用户

首先,在MySQL8.x中创建Mycat连接MySQL的用户,如下所示。

CREATE USER 'mycat'@'192.168.175.%' IDENTIFIED BY 'mycat';
ALTER USER 'mycat'@'192.168.175.%' IDENTIFIED WITH mysql_native_password BY 'mycat'; 
GRANT SELECT, INSERT, UPDATE, DELETE  ON *.* TO 'mycat'@'192.168.175.%';
FLUSH PRIVILEGES;

2.配置schema.xml文件





	
		
select user() select user() select user()

3.配置server.xml文件




	
		1
        druidparser
		3307
		3308
		0
		0.0.0.0
		utf8mb4
		2048
		2
		2
		1800000
		300
		0
		0
		2
		1000
		104857600
	
	
	
		1
		cTwf23RrpBCEmalp/nx0BAKenNhvNs2NSr9nYiMzHADeEDEfwVWlI6hBDccJjNBJqJxnunHFp5ae63PPnMfGYA==
		shop
	

注意:在需要使用MySQL 8.x的mysql命令连接Mycat时,在server.xml文件的system标签下必须配置如下选项。

1
druidparser

否则,MySQL 8.x的mysql命令连接Mycat会失败。

user标签下的password标签的值为登录Mycat的密码,此值使用Mycat提供的加密类对密码明文进行了加密。此类存在于Mycat安装目录下的lib目录下的Mycat-server-xxx-release.jar中的io.mycat.util.DecryptUtil类,可以使用如下命令对密码进行加密。

java java -cp /usr/local/mycat/lib/Mycat-server-xxx-release.jar io.mycat.util.DecryptUtil 0:mycat:mycat

其中0:mycat:mycat为运行Jar包的参数,0表示应用程序连接Mycat时使用密文密码;第一个mycat代表连接Mycat的用户名,也就是说为哪个用户的密码加密;第二个mycat代表需要加密的密码。

加密后的结果数据如下所示

cTwf23RrpBCEmalp/nx0BAKenNhvNs2NSr9nYiMzHADeEDEfwVWlI6hBDccJjNBJqJxnunHFp5ae63PPnMfGYA==

即user标签下的password属性的值。

如果按照上述方式为连接Mycat的密码加密后,需要在user标签下配置如下选项,否则无法正确连接Mycat

1

4.连接Mycat

使用MySQL 8.x中的mysql命令连接Mycat,如下所示。

[root@binghe151 ~]# mysql -umycat -pmycat -h192.168.175.151 -P3307 --default-auth=mysql_native_password
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.29-mycat-xxx-release-20200228205020 MyCat Server (OpenCloudDB)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

使用MySQL8.x中的mysql命令连接Mycat时,需要注意的是要在mysql命令后面添加--default-auth=mysql_native_password选项。

接下来,查看下Mycat下的逻辑库和逻辑表,如下所示。

mysql> SHOW DATABASES;
+----------+
| DATABASE |
+----------+
| shop     |
+----------+
1 row in set (0.00 sec)

mysql> USE shop;
Database changed
mysql> SHOW TABLES;
+-----------------------+
| Tables in shop        |
+-----------------------+
| customer_balance_log  |
| customer_inf          |
| customer_level_inf    |
| customer_login        |
| customer_login_log    |
| customer_point_log    |
| order_cart            |
| order_customer_addr   |
| order_detail          |
| order_master          |
| product_brand_info    |
| product_category      |
| product_comment       |
| product_info          |
| product_pic_info      |
| product_supplier_info |
| region_info           |
| serial                |
| shipping_info         |
| warehouse_info        |
| warehouse_proudct     |
+-----------------------+
21 rows in set (0.00 sec)

mysql> SELECT product_id, product_code, product_name FROM product_info LIMIT 10;
+------------+------------------+---------------------------------------+
| product_id | product_code     | product_name                          |
+------------+------------------+---------------------------------------+
|          1 | 3700000000000001 | [Columbia]打底裤示例商品-1            |
|          2 | 3600000000000001 | [TheNorthFace]小脚裤示例商品-1        |
|          3 | 3500000000000001 | [李宁]九分裤示例商品-1                |
|          4 | 3400000000000001 | [LOWA]哈伦裤示例商品-1                |
|          5 | 3300000000000001 | [JACK&JONES]连体裤示例商品-1          |
|          6 | 3200000000000001 | [诺诗兰]牛仔裤示例商品-1              |
|          7 | 3100000000000001 | [骆驼]休闲裤示例商品-1                |
|          8 | 3000000000000001 | [金狐狸]风衣示例商品-1                |
|          9 | 2900000000000001 | [Columbia]小西装示例商品-1            |
|         10 | 2800000000000001 | [李宁]外套示例商品-1                  |
+------------+------------------+---------------------------------------+
10 rows in set (0.01 sec)

至此,就配置完了,是不是很简单呢?喜欢的话点个赞吧!!

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