mysql query garbled code

MySQL is currently the mainstream relational database management system, but during use, you may encounter garbled query results. The reasons for query garbled characters are generally as follows:

1. Database character set mismatch: The MySQL database character set is incorrectly set. For example, the GBK character set is used instead of the UTF-8 character set to store data. It is easy to cause garbled characters in query results.
2. Application encoding setting error: Inconsistency between the encoding set in the application and the MySQL database character set will also cause the query results to be destroyed.
3. Field type mismatch: The field type defined in the table does not match the actually stored data type, and the query results will also be garbled.

For these problems, we can solve the problem of garbled query characters through the following methods:

1. Modify the MySQL database character set: You can modify the character set in the MySQL configuration file Set (my.cnf file), or modify the character set of the database, table, field, etc. to solve the problem of database character set mismatch.
2. Modify application encoding: You can set the correct encoding format in the application, such as using UTF-8 encoding format. At the same time, when using the data connector, you also need to set the correct encoding format.
3. Modify field type: When creating a table, please make sure that the defined field type matches the actual stored data type. For example, if Chinese is stored, define the field type as "varchar" or "text".

In addition, you can also use the following methods to avoid the problem of garbled query characters:

1. Use the "set names utf8" command in the query statement to change the query statement Convert the character set to UTF-8 to ensure correct query results.
2. Use the "show variables like '%char%'" command in the MySQL client to check the setting of the character set of the MySQL database to ensure that the character set is consistent with the encoding to be queried.
3. Use the "convert" function provided by MySQL to convert the query results into the specified character set to avoid garbled characters.

To sum up, solving the MySQL query garbled problem requires us to start from many aspects, modify and adjust from the database, application encoding settings, field types and other aspects to ensure the query results Correct, accurate, no garbled characters. At the same time, when querying data, you should also use correct methods and instructions to avoid garbled characters caused by mismatch between query instructions and character sets.

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