MySQL连接及基本信息查看命令汇总_MySQL
学习PHP就不得不提MySQL,虽然有phpMyadmin这样的工具可以图形化操作数据库,但我还是想借学习PHP的机会使用下命令行方式操作数据库。以下就是我的学习小结,包括命令行连接数据库,查看当前用户,查看当前使用的存储引擎,查看MySQL版本等基本命令。
连接数据库
命令格式:mysql -h hostname -u username -p
-h指定要连接的MySQL数据库所在的主机,如果是本机,可以省略。
-u指定登录的用户名,如果不指定,默认是操作系统的登录用户名。
-p指定密码。可以在-p之后直接输入密码,但是这种方式密码将显示出来。好的方式是先不输入密码,回车之后系统会提示输入密码,此时再输入密码将使用*显示。这样相对安全一些。正确连接后将出现欢迎界面。如下图所示:
退出数据库使用quit命令即可。
当一个应用连接数据库时,建议不要使用root管理员用户连接。好的方法是为应用创建一个或几个特定权限的普通用户来操作数据库。对于普通用户遵循最小权限原则,这样能最大程度的提高数据库的安全性。
各种数据库信息查看命令
查看数据库的版本 select version();
查看数据库支持的存储引擎及当前的默认存储引擎 show engines;
如下图所示,显示MySQL数据库的所有存储引擎,default为当前默认的存储引擎,还有是否支持事务等信息:这里写图片描述
查看当前登录数据库的用户名 select user();
查看当前登录数据库用户的权限 show grants for sally; –sally为用户名
查看当前用户能看到的所有数据库 show databases;
转到指定的数据库 use books; – books为数据库名
查看当前数据库中所有的表 show tables;
查看某个表的结构信息 describe customers; –customers为表名
上述命令运行情况如下图所示:
以上就是总结的MySQL连接及基本信息查看命令,更多相关内容请关注PHP中文网(www.php.cn)!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.

The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting

Installing MySQL on CentOS involves the following steps: Adding the appropriate MySQL yum source. Execute the yum install mysql-server command to install the MySQL server. Use the mysql_secure_installation command to make security settings, such as setting the root user password. Customize the MySQL configuration file as needed. Tune MySQL parameters and optimize databases for performance.

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.
