The data imported by mysql is garbled

MySQL is a commonly used relational database management system that can store and manage various data types. However, when using MySQL to import data, you often encounter garbled characters. This problem can be manifested as some characters in the text turning into strange symbols or garbled characters, causing the data to not be displayed or read correctly. This article will help readers gain an in-depth understanding of the reasons why MySQL import data is garbled due to encoding problems, and provide some solutions.

1. Reasons why MySQL imports garbled data

1. The data encoding format does not meet the requirements of MySQL

MySQL supports multiple encoding formats, such as UTF- 8. GBK, GB2312, etc., and the imported data must be the same as the encoding format used by MySQL, otherwise garbled characters may occur.

For example, in MySQL using UTF-8 encoding, garbled characters may appear when importing GBK-encoded data.

2. There is an encoding problem in the data file itself

When processing the data file, if the file itself uses the wrong encoding format, it will cause garbled characters when imported into MySQL. Especially when exporting files from a Windows system, since the default encoding of the Windows system is GBK, the encoding format used by the data file may not match the encoding format of MySQL.

3. Special characters exist in the data

If there are special characters in the data, such as Emoji expressions, font symbols, etc., their encoding format may be different from that supported by MySQL Different encoding formats lead to garbled code problems.

2. Solution

1. Check the data encoding format

Before importing data, it is recommended to check the encoding format of the data to ensure that it is consistent with MySQL. The encoding format used is consistent. This can be done using a text editor or command line tool.

For example, in a Linux system, you can use the file command to check the file encoding format:

file -bi filename

If the file encoding format is correct, you can continue to import data.

2. Modify MySQL encoding format

If you check the data file encoding format and find that it does not match the MySQL encoding format, you need to modify the MySQL encoding format.

This can be achieved by modifying the MySQL configuration file. In its configuration file, find the following two items:

character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci

Set the values ​​of these two items to the same encoding format as the data file encoding format.

3. Convert data file encoding

If the imported data file has encoding problems, you can convert its encoding format to an encoding format supported by MySQL before importing. You can use various text editors or command line tools for transcoding, such as using the iconv command:

iconv -f gbk -t utf-8 filename -o converted_filename

This command will convert the filename file from GBK encoding format to UTF-8 encoding format and generate a new File converted_filename.

4. Handling special characters

If there are special characters in the data, it can be solved by encoding the text.

For example, Emoji expressions are four bytes in UTF-8 encoding, and need to be supported by utf8mb4 encoding in MySQL. Therefore, the data can be converted according to the utf8mb4 encoding format and then imported.

In short, the solution to the problem of garbled data imported into MySQL is to check the data encoding format, modify the MySQL encoding format, convert the data file encoding and process special characters. If readers encounter garbled characters, they can take the above measures to solve it.

The above is the detailed content of The data imported by mysql is garbled. For more information, please follow other related articles on the PHP Chinese website!