How to modify mysql character encoding

With the development of the information age, databases have become the cornerstone of enterprise information construction, and MySQL database is one of the most well-known and widely used open source databases in the industry. But sometimes when using the MySQL database, we will find that the data in the database is garbled. The main reason may be due to inconsistent character encoding. So how to modify the MySQL character encoding? The following will introduce it to you in detail.

1. Overview of MySQL character set

The character sets supported by MySQL mainly include ASCII, GB2312, GBK, UTF-8, etc., among which UTF-8 is widely used. Character set refers to the way characters are encoded. In layman's terms, a character set maps characters in human language into a binary encoding form that can be recognized by computers. According to the ASCII encoding regulations, the encoding range of English characters and numbers is 0~127. This range is called the ASCII character set. Later, with the popularization of computers and the development of the Internet, people found that the English character set could not meet the needs of multi-language, so encoding methods such as GB2312, GBK, and UTF-8 emerged, which can support the encoding of multi-language character sets.

2. MySQL character set setting

When using the MySQL database, you can check the setting of the MySQL character set through the following statement:

SHOW VARIABLES LIKE 'character%';

The screenshot is as follows:

You can see the three key parameters in MySQL: character_set_client, character_set_connection and character_set_results.

• character_set_client: refers to the client’s character set.
• character_set_connection: refers to the connection character set, used to represent the character set sent by the client to MYSQL.
• character_set_results: refers to the result character set, used to represent the result character set returned by MYSQL to the client.

If these three parameters are all UTF8, then the MySQL character set has been set correctly and no modification is required. However, in the actual production environment, we often find that the data in the MySQL database is garbled. At this time, the MySQL character encoding needs to be modified.

3. MySQL character encoding modification

1. Modify character_set_client

If the client character set is incorrect, you can change it through the following statement:

SET character_set_client = utf8;

Change Just change utf8 to the character set you actually need.

2. Modify character_set_connection

If the connection character set is incorrect, you can change it through the following statement:

SET character_set_connection = utf8;

3. Modify character_set_results

If the result character set is incorrect , can be changed through the following statement:

SET character_set_results = utf8;

It should be noted that the MySQL character set modification should be set based on the database and table level, that is, the entire database or a certain table should be modified.

4. MySQL character set modification example

The following is a simple example, taking modification of the data table as an example:

1. Query the original character set

SHOW CREATE TABLE product;

2. Modify the data table

ALTER TABLE product CONVERT TO CHARACTER SET utf8;

3. Query whether the character set of the data table has been modified successfully

SHOW CREATE TABLE product;

4. Modify the data in the table

ALTER TABLE product CHANGE name name TEXT CHARACTER SET utf8;

The above example shows How to modify the MySQL character encoding. I believe these operations can be helpful for modifying the MySQL character encoding and MySQL character set.

Summary

Many times, we do not realize the importance of character encoding. In the MySQL database, if the character encoding is incorrect, the data may be garbled and even cause the application to crash. Therefore, when using the MySQL database, be sure to pay attention to the character encoding settings to ensure that the data is stored and used normally. When the problem of garbled character set storage occurs, it can be solved by the method introduced above, which can not only improve the stability of the application, but also ensure the integrity and correctness of the data.

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