How to modify the mysql library encoding

With the development of the Internet, databases have become an important tool for data storage. The MySQL database occupies an important position in this competition in the field of data storage. Just imagine, when your project is connected to the MySQL database, garbled characters appear in the database, which will definitely affect the normal use of the project. Therefore, coding modifications to the MySQL library are particularly important. The following will describe in detail how to code modifications to the MySQL library.

1. Prerequisite explanation

Before modifying the encoding of the MySQL library, we must first understand MySQL and the character set.

MySQL is a relational database management system that supports multiple character sets, such as UTF-8, GBK, GB2312, etc. Each MySQL library has a default character set, which is also specified when the database is created. If the character set is not explicitly specified when creating the database, MySQL will use the default character set for data storage, which may cause problems such as garbled characters.

2. Steps to modify MySQL encoding

1. Back up MySQL data

Before modifying MySQL encoding, we must first back up MySQL data. This step is particularly important to avoid unnecessary data loss.

2. Modify the MySQL configuration file

Enter the following command in the terminal to open the MySQL configuration file

vim /etc/my.cnf

Add the following configuration to the opened my.cnf file:

[client] 
default-character-set = utf8 

[mysql] 
default-character-set = utf8 

[mysqld] 
character-set-server = utf8 
collation-server = utf8_unicode_ci

The above configuration description:

• [client] and [mysql] are client-related configurations.
• [mysqld] is the server-side configuration.
• default-character-set is used to set the default value of the character set between the client and the mysql program (for example: mysqldump, mysqladmin, etc.) and the server.
• character-set-server indicates the character set used by the server-side database.
• collation-server indicates the collation rules used by the server-side library.

3. Modify the character set of the existing table

Execute the following command to modify the character set of the existing table.

alter table table_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;

This command is used to change the character set of the specified table in the database to UTF-8, where table_name is your own table name.

After performing the above operations, the data belonging to the table will be modified to UTF-8 encoding.

4. Modify the MYSQL library encoding

Execute the following command to modify the encoding of the MySQL library.

alter database database_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

This command can change the default character set of all tables and indexes in the database to UTF-8, where database_name is the name of your own database.

5. Restart the MySQL service

Execute the following command to restart the MySQL service.

systemctl restart mysqld

3. Summary

MySQL is a widely used database, and the correctness of its character set settings has an important impact on ensuring the accuracy and stability of the data. The above steps are the complete process of modifying the MySQL library encoding for your reference.

The above is the detailed content of How to modify the mysql library encoding. For more information, please follow other related articles on the PHP Chinese website!