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In practical development, the operation of database usually involves multiple tables, involving the relationship between objects and objects. MyBatis provides association mapping for operations between multiple tables, which can handle the relationship between objects very well. 9.1 Summary of Relevance Relations One-to-one: Introduce the o ...

I. cookie What is Cookie? "Cookie is a variable stored in the visitor's computer. This cookie is sent whenever the same computer requests a page through a browser. You can use JavaScript to create and retrieve cookie values. - w3school Cookies are files created by visited websites to store browsing information, such as personal data. ...

zabbix Foundation and Advancement (1) - zabbix Component Deployment zabbix is a well-known distributed monitoring system.Supports the collection of zabbixagent data through the proxy server zabbix proxy, then saves the collection in the local database and sends it to the zabbix server for uniform storage and display. Zabbix services w ...

Record the process of an installation System: centos php version: 5.4 5.6 Purpose: Install two php versions 1: First install the first version of php5.4 via lnmp specific command lnum has specific operations on the official network 2: Modify the configuration of php-fpm Stop running php-fpm first, check pid of php-fpm first [roo ...

There are four isolation levels for database transactions: Read Uncommitted: Allow dirty reading, that is, it is possible to read data in other sessions that have not submitted transaction modifications. Read Committed: Only submitted data can be read, which is the default level for most databases such as Oracle. Repeated Read: Repeated Read. ...

Compile and install the zabbix-server side of the deployment in the CentOs 7.0 environment First you need to close selinux [root@bogon ~]# sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/selinux/config [root@bogon ~]# setenforce 0 Close Firewall [root@bogon ~]# systemctl stop firewalld.service About zabbix and related service software ...

The PCI standard is a set of standards designed to maximize the protection of cardholder data. There are many requirements, you can see. PCI standard Site understanding. There are many requirements. For program apes, it is necessary to ensure that any payment information of users does not go to their own servers and do not save in their own dat ...

There is a serialize() function in php that serializes arrays into strings for storage and transmission. If you want to deserialize this string, you only need a simple unserialize() function in php. But it's not so easy in golang. It takes a lot of effort to write a lot of code. At this time, I just want to sigh that php is really the best lang ...

Here we use the WorkerMan framework, the server is CentOS, the Web server is Apache, and the development language is PHP. Because WSS is a combination of WebSocket and SSL, it is necessary to prepare the SSL certificate for the corresponding domain name in advance. Generally, there are three certificate files, such as the following: SSLCertif ...

Queue: Basically, a queue is a FIFO data structure The Queue interface, at the same level as List and Set, inherits the Collection interface. LinkedList implements the Deque interface. Implementation of Queue 1. LinkedList with Implemented Blocking Interface: Implemented java.util.Queue Interface and java.util.AbstractQueue InterfaceBuilt-in ...