mysql database garbled code

MySQL database garbled problem and solution

MySQL is an open source relational database management system. Due to its high efficiency, stability and wide range of Internet applications, it is widely used in various websites and in the application. However, in the process of using the MySQL database, some users will encounter the problem of "garbled characters". This article will introduce the causes and solutions to the problem of garbled characters in the MySQL database.

1. Causes of garbled characters

(1) Inconsistent character sets

MySQL database supports various character sets, including utf8, gbk, latin1, etc. If the default character set is not specified when creating a table, the default character set of the MySQL server will be used. If the default character set of the MySQL server is inconsistent with the character set of the client connection, garbled characters will appear.

(2) Data storage and reading are inconsistent

There are many ways to store and read MySQL database, such as binary storage, text storage, etc. If during the database storage and reading process, If the methods used are inconsistent, garbled characters will also appear.

(3) Application synchronization problem

In applications using MySQL database, if there is no encoding setting or encoding conversion, garbled characters will also appear.

2. Solution

(1) Modify the character set

In the MySQL database, we can modify the default character set through the following command:

ALTER DATABASE database_name DEFAULT CHARACTER SET utf8;

Among them, database_name represents the database name of the character set to be modified, and utf8 represents the character set to be modified.

(2) Set encoding

In applications using MySQL database, we can set the encoding through the following command:

SET NAMES 'utf8';

Among them, utf8 indicates the encoding type to be set.

(3) Convert encoding

In applications using MySQL database, we can perform encoding conversion through the following function:

CONVERT(str USING conversion encoding);

Among them, str represents the string to be encoded and converted, and the conversion encoding represents the encoding type to be converted.

(4) Choose appropriate storage and reading methods

In the MySQL database, we can choose appropriate storage and reading methods to avoid garbled characters. If the stored data is plain text, you can use the text storage method. If the stored data is binary data such as pictures, you can use the binary storage method.

3. Notes

In the process of using the MySQL database, we should pay attention to the following matters:

(1) Specify clearly when creating the table character set.

(2) Set the encoding in the application.

(3) When storing and reading data, special attention should be paid to the selection of storage and reading methods.

(4) After using the data, be sure to close the connection and release the resources.

In short, although the MySQL database garbled problem is common, it is only a small problem. We only need to understand the cause and adopt corresponding solutions to easily solve this problem and use the MySQL database more smoothly. .

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