How to avoid Chinese garbled characters when importing data into Oracle?

Title: How to avoid Chinese garbled characters when Oracle imports data?

In our daily work, we often encounter situations where we need to import Chinese data into the Oracle database. However, Chinese garbled characters often appear during the import process, which causes problems in data processing and analysis. To avoid this problem, we need some tips and precautions. The following will introduce how to avoid Chinese garbled characters when importing data into Oracle, and provide specific code examples.

1. Use the correct character set

When creating an Oracle database, you need to select an appropriate character set to ensure that Chinese data can be stored and displayed correctly. It is generally recommended to use the UTF8 character set because it can support various languages ​​​​including Chinese. When creating a database, you can specify the character set as follows:

CREATE DATABASE mydatabase
CHARACTER SET AL32UTF8

The database created in this way can correctly handle Chinese data and avoid confusion problems.

2. Specify the correct NLS_LANG parameters

When importing data, you need to ensure that the NLS_LANG parameter of the session is set correctly to match the database character set. You can set the NLS_LANG parameter before starting the session, for example:

ALTER SESSION SET NLS_LANG= 'SIMPLIFIED CHINESE_CHINA.AL32UTF8';

This can ensure that Chinese data can be processed correctly during the import process and avoid garbled characters.

3. Use the correct import tools and options

When importing data, you can use tools such as SQL*Loader or Data Pump, and specify appropriate options to process Chinese data. For example, when using Data Pump to import data, you can specify the INCLUDE='CHARACTERSET AL32UTF8' parameter to ensure correct processing of Chinese data.

4. Check the character set of the data source file

Before importing data, you need to ensure that the character set of the data source file is consistent with the database character set to avoid Chinese garbled characters due to character set mismatch. You can use tools such as iconv to convert the file character set to ensure that the data is UTF8 encoded before importing.

Conclusion

Through the above methods and precautions, we can avoid the problem of Chinese garbled characters when importing data into Oracle and ensure that the data can be stored and displayed correctly. Correctly setting the character set and NLS_LANG parameters, selecting appropriate import tools and options, and checking the character set of the data source file are all key steps to ensure correct data import. I hope that these tips can help you solve the problem of Chinese garbled characters and improve the efficiency and accuracy of data import.

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