With the development of Internet technology, databases have become an indispensable and important part of modern enterprise informatization. MySQL is a common open source database management system that can be widely used for business data storage and management of major enterprises. But sometimes when we use MySQL to query, garbled characters will appear, which affects our query efficiency. Today, we will discuss the reasons and solutions for MySQL reading garbled characters.

1. Cause

①mysql connection character set setting error: When we connect to mysql, we need to set the character set of the client and server. If there is an error in setting the character set, it may cause garbled characters when reading data.

②The data source character set does not match the client character set: some text strings are stored in the database, and when we read these text strings, we need to convert them into corresponding ASCII codes. If the character set in the database does not match the character set used by our client, garbled characters may appear during the conversion process.

③The data stored in the database itself is garbled: If the character set we use when storing data is inconsistent with the character set of the actual data, garbled characters may appear.

2. Solution

①Modify the MySQL default character set to utf-8: We can set the default character set to utf-8 by modifying the MySQL configuration file. Since using utf-8 encoding can solve most Chinese garbled characters, the specific configuration method is as follows:

Add the following two lines in the [mysqld] section of the my.cnf or my.ini file:

character_set_server=utf8mb4
collation_server=utf8mb4_unicode_ci

②Set the character set to the correct value: We need to set the character set of the client and server according to the actual situation, which can be set by the following statement:

SET NAMES utf8mb4;

③Modify the default character set of the data table and database to utf-8: We can modify the character set of the data table and database through the following statement:

Modify the default character set of the database Set to utf8mb4

ALTER DATABASE db_name CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

Modify the character set of the table.

ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

④Convert Chinese strings in advance before storing them in the database: We can transcode the data on the client and then store it, so as to ensure that the character set of the physically stored strings is consistent with the data source.

To sum up, for the problem of MySQL reading garbled characters, we need to investigate from multiple angles. The more common methods are to modify the default character set to utf-8, match the character set, and modify the characters of the database and table. Collect and transcode in advance, etc. Only by adopting different solutions for different situations can we better solve the problem of reading garbled characters and improve the efficiency of our data query.

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