Fix Oracle Database Garbled Characters

In Oracle database, garbled characters may occur due to mismatched character sets or using the wrong character set during data insertion. Below are some solutions:

1. Ensure that the database character set is properly configured: You can check the database character set to verify if it matches the character set settings of the application. You can use the following SQL query to view the database character set:

SELECT * FROM NLS_DATABASE_PARAMETERS;

If you find that the character sets do not match, you can use the following command to change the character set of the database:

ALTER DATABASE CHARACTER SET <new_charset>;

1. Ensure the client character set is properly configured: If the client character set used by the application to connect to the database does not match, it can result in encoding issues. You can set the correct character set in the client program or specify it in the connection string.
2. When inserting data, make sure to use the correct character encoding to avoid displaying garbled text. Specify the character encoding format when inserting data, for example:

INSERT INTO table_name (column_name) VALUES (CONVERT('数据', 'UTF8', 'GBK'));

1. Convert corrupted data: If there is corrupted data, you can use a conversion function to transform the corrupted data into the correct character encoding format, for example:

SELECT CONVERT(column_name, 'UTF8', 'GBK') FROM table_name;

By using the methods mentioned above, the issue of character encoding errors in Oracle databases can be resolved. If the problem persists, consider contacting the database administrator or Oracle technical support for further investigation and resolution.