oracle11g garbled code

Oracle11g Garbled Code Problems and Solutions

When using Oracle database, sometimes you will encounter garbled characters, that is, Chinese characters cannot be displayed normally when storing or reading data in the database. This problem may affect our work efficiency, so it needs to be solved in time. This article will introduce the main reasons and solutions for garbled characters in Oracle11g.

1. The main reason for the garbled code problem

1.1 Inconsistent character set settings

Oracle database supports multiple character sets, such as UTF-8, GBK, GB2312 etc. If different character sets are used in different environments, garbled characters will occur during data exchange or query.

1.2 Database version issue

In versions prior to Oracle11g, Oracle uses the US7ASCII character set by default. This character set does not support Chinese characters, so garbled characters will occur when using Chinese characters. . In Oracle11g and later versions, Oracle uses the AL32UTF8 character set by default, which can support Chinese characters well.

1.3 Client software problems

Oracle will have garbled code problems on different client software. For example, when using PL/SQL Developer, if the encoding settings of the software are inconsistent with the database, it may cause garbled Chinese characters. Therefore, ensure that the character set settings of the client software and the database are consistent.

2. Methods to solve the garbled code problem

2.1 Change the Oracle character set settings

You can solve the garbled code problem by changing the character set settings of the Oracle database instance. In Oracle11g and later versions, you can view Oracle's current character set settings through the following command:

SELECT * FROM NLS_DATABASE_PARAMETERS WHERE parameter='NLS_CHARACTERSET';

If the character set displayed in the result If it is not AL32UTF8, you can change the character set settings through the following command:

ALTER DATABASE CHARACTER SET AL32UTF8;

2.2 Change the character set settings of the client software

If there is a problem with garbled characters This is caused by the character set settings of the client software. You can try changing the character set settings of the software to solve the problem. For example, when using PL/SQL Developer, you can change the font and encoding settings in "Tools -> Preferences -> Environment -> Fonts & Colors".

2.3 Convert data to Unicode encoding

If the data already exists in the database, you can solve the garbled problem by converting the data to Unicode encoding. You can use the following PL/SQL script to convert the data to Unicode encoding:

UPDATE table_name SET column_name = CONVERT(column_name, 'AL32UTF8', 'WE8MSWIN1252');

This will convert the table tableName The character set in the column_name column is converted from WE8MSWIN1252 to the Unicode character set (AL32UTF8).

2.4 Specify the character set before storing Chinese character data

In order to prevent garbled characters, when storing Chinese character data, the character set must be set before storing the data. In the SQL statement, you can use the following statement to specify the character set:

INSERT INTO table_name (column_name) VALUES (N'Chinese characters');

Among them, N represents Unicode encoding.

3. Summary

The garbled code problem of Oracle11g may affect our work efficiency, so when using Oracle11g, we should pay attention to avoid the occurrence of garbled code problem. This article introduces in detail the main causes and solutions of garbled characters in Oracle11g. I hope it will be helpful to the majority of Oracle users.

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