How to deal with oracle garbled code

Oracle garbled problems are usually caused by improper character set settings. Solutions include: Checking the server, database, and client character sets. Set up the server, database, and client character sets as needed. Use the CONVERT function or the DBMS_LOB.CONVERT_LOB function to repair garbled data. Always specify the character set and set the NLS parameters correctly.

How to deal with Oracle garbled code

Garbage code problems in Oracle databases are usually caused by improper character set settings. To solve the problem of garbled code, you need to start by checking and setting the character set.

1. Check the character set

• Server character set: Use the command select * from v$nls_parameters where parameter='NLS_CHARACTERSET' to view the server character set.
• Database character set: Use the command select * from v$database where name='database_name' to view the database character set.
• Client character set: Use the command select * from v$NLS_parameters where parameter='NLS_LANG' to view the client character set.

2. Set character set

• Set server character set: Use the command alter system set NLS_CHARACTERSET='字符集名称' scope=both to set server character set.
• Set the database character set: Use the command alter database character set '字符集名称' to set the database character set. The database needs to be restarted to take effect.
• Set client character set: Set NLS_LANG parameter in the TNS configuration file to specify the client's character set.

3. Fix garbled data

• Use CONVERT function: Use CONVERT(字段名, '新字符集', '原始字符集') to convert garbled data into the correct character set.
• Use the DBMS_LOB.CONVERT_LOB function: For LOB data, use DBMS_LOB.CONVERT_LOB(lob字段, '新字符集', '原始字符集') function for conversion.

4. Prevent garbled codes

• Always specify a character set: Always specify the appropriate character set when creating tables, inserting data, and querying data.
• Use NLS parameters: Set NLS parameters correctly in the database and client to ensure the character set is consistent.
• Regular maintenance: Check and update character set settings regularly to avoid garbled problems.

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