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grails has been upgraded to version 3.0.9 due to work needs, and needs to configure multiple data sources. grails 2.1's multi-source configuration is relatively simple, but more than 3.0 version of the database configuration changes to application.yml for configuration, how to configure multi-source, Baidu and bing search no answer (forgive me ...

Preface Original Address Once, did you think about the future of a front-end engineer?Did you think of the word "Front End Architect" at this point, so a qualified front end architecture will only have a Front End OK?Of course not. You must have the full stack of abilities to expand your personal image, to get a promotion and pay rais ...

This paper first introduces the installation and basic use of mysql, advanced operation, import and export of MySQL and automatic backup, then introduces the security mode modification password and full text search function of mysql, and finally records the problem set encountered in personal use of mysql. Start installation: sudo apt-get in ...

-- drop table p_table; -- drop table c_table; CREATE TABLE p_table ( -- Parent table id int(11) NOT NULL auto_increment, p_name varchar(20) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB char set = utf8 ; CREATE TABLE `c_table` ( -- Child table `id` int(11) NOT NULL auto_increment, `c_name` varchar(20) DEFAULT NULL, `p_id` i ...

We usually use OCLint tools to generate static code analysis reports and Slather to generate unit test coverage reports, but these reports are relatively simple. Sonar Qube shows the problems in the code in a visual way. This article will show how to use Sonar Qube to show O. CLint scanned report. Installation software This article takes Ubuntu ...

Start or stop Start Mysql Server sudo /usr/local/mysql/support-files/mysql.server start Start the Mysql client sudo /usr/local/mysql/support-files/mysql.server stop mac preference settings start or close Configuration file settings Copy cnf files cp /usr/local/mysql/support-files/my-default.cnf /etc/my.cnf //Copy the default mysql conf ...

title: Server Development Series 2 date: 2017-9-13 11:27:46 After three weeks of crazy overtime, the pace of server development can finally be put on hold, and there is time to take a good look at the project from an "external" perspective. Write tcp server naked using swoole In the absence of the Swiss Army Knife (familiar framework) ...

Change from: http://mysql.taobao.org/monthly/2016/06/07/ External Temporary Table Through CREATE TEMPORARY TABLE Create temporary tables, which are called external temporary tables. This temporary table is only visible to the current user and closes automatically at the end of the current session. This temporary table can be named with the ...

First: experimental environment Operating System: CentOS release 6.5 (Final) mysql dual master replication + keepalive achieves high availability: master1:10.192.203.201 master2:10.192.203.202 vip 10.192.203.203 Virtual ip is currently on master 1. The program writes vip.   2. Experimental steps 2.1 Upgrade Mas ...

The first condition for efficient index use is to know what queries will be used in the index. This problem is related to the "Leftmost Prefix Principle" in B+Tree. Here is an example to illustrate the Leftmost Prefix Principle. Let's start with the concept of joint indexing. In the above, we all assume that the index refers to only ...