mariadb declare variable

Translation: DECLARE Variable (submitted to the MariaDB official Manual), variablemariadb This article is a translation of the mariadb official manual: DECLARE Variable. Original article:

This is the official manual of MARIADB: DECLARE variable.Original:https://mariadb.com/kb/en/library/declare-variable/I submit it to MARIADB official manual:https://mariadb.com/kb/zh-cn/declare-variable/Grammar:DECLARE var_name [, var_name] ... type [

There are several types of variables in MYSQL/MARIADB: User-defined variables, system variables, general temporary variables (local variables, or local variables).1. User VariablesUser variables are session-based and user-based, so I think it's more

FunctionA function is to encapsulate a piece of code in a struct, and invoke the struct (function) directly when it is necessary to execute the code. This operation enables the reuse of code. In MySQL, there are two kinds of functions: system

Storage functionsNote: Parameters can have more than one parameter, and there must be only one return value.1. System functionsReference Official Document: Https://dev.mysql.com/doc/refman/5.7/en/func-op-summary-ref.html2. Custom Function

Variableprogram = instruction (read-only) + data (location variables, lists, arrays of data stores)Directives can be called through positional variables, and data passed to the scriptA variable name can refer to a "named Memory Space": The memory

Variableprogram = instruction (read-only) + data (location variables, lists, arrays of data stores)Directives can be called through positional variables, and data passed to the scriptA variable name can refer to a "named Memory Space": The memory

Objective:Automatically deploy Lnamp with Ansible for highly available nginx reverse server, central http+php provides Web services, backend links to the same MySQL databaseLab Environment:Ansible Host: 10.0.0.10/8Nginx (main): 10.0.0.11/8Nginx

Saltstack Configuration ManagementSaltstack configuration management, also known as state management, Saltstack cannot rollback a state. When we write the SLS file, to support multiple executions, such as: Write the Software Installation module,

Shell script programming and file system RepairGuideThe Linux Foundation has initiated the LFCS certification (Linux Foundation Certification System Administrator) Linux Foundation Certified Sysadmin, which is a brand new certification system, the