How to set up mysql utf8

In MySQL, character sets and collation rules are very important because they directly affect the storage and retrieval of data in the database. In this article, I will explain how to set the UTF8 character set in MySQL.

UTF8 is a variable-length encoding for the Unicode character set. It can use 1 to 4 bytes to represent a character, whereas for ASCII characters, UTF8 only uses one byte. The character set using UTF8 encoding can support characters from all over the world, including Chinese, Japanese, Korean, etc.

There are two ways to set the character set and collation of the MySQL database: set it when creating the database or set it when creating the table. If you already have a database or table, you can also use the ALTER command to modify the character set and collation.

Method 1: Set the character set and collation when creating the database

When creating the database, you can use the following command to specify the character set and collation:

CREATE DATABASE mydatabase CHARACTER SET utf8 COLLATE utf8_general_ci;

here The utf8_general_ci is a collation. CI stands for case-insensitive, and utf8_general_ci is a collation for UTF8-encoded character sets.

You can also use the following command to view all collations supported in MySQL:

SHOW COLLATION;

Method 2: Set the character set and collation when creating the table

When creating the table Table, you can use the following command to specify the character set and collation:

CREATE TABLE mytable (
    id INT PRIMARY KEY,
    name VARCHAR(50)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;

Here utf8 is a character set, utf8_general_ci is a collation.

Method 3: Use the ALTER command to modify the character set and collation rules

If you already have a database or table, you can use the ALTER command to modify the character set and collation rules. For example, if you want to change the character set and collation of the table to UTF8 encoding, you can use the following command:

ALTER TABLE mytable CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;

where mytable is your table name, utf8 is a character set, utf8_general_ci is a sorting rule.

It should be noted that when modifying the character set and collation rules, you must first back up the original data, then create a new database or table, and restore the backed up data to the new database or table.

Summary

Setting the UTF8 character set in MySQL can support a global range of characters. You can specify the character set and collation when creating a database or table, or you can use the ALTER command to modify the character set and collation in an existing database or table. No matter which method is used, you need to back up the original data first, then create a new database or table, and restore the backed up data to the new database or table.

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