Sharing tips on dealing with the problem of Chinese garbled characters imported into Oracle

Sharing tips on dealing with the problem of Chinese garbled characters imported into Oracle

In the process of using Oracle database for data import, we often encounter garbled Chinese data. This may be due to character set mismatch, data source encoding issues, or database configuration errors. In order to solve this problem, this article will share some tips for dealing with the problem of Chinese garbled characters imported into Oracle, so that everyone can smoothly import Chinese data in actual operations.

1. Check the database character set

Before solving the problem of Chinese garbled characters, you first need to check the character set settings of the Oracle database. You can use the following SQL statement to query the database character set:

SELECT * FROM v$nls_parameters WHERE parameter LIKE '%CHARACTERSET';

Make sure the database character set setting supports Chinese. Common character sets include AL32UTF8, ZHS16GBK, and UTF8. If the database character set does not support Chinese, garbled characters may occur during data import.

2. Check the encoding of imported data

Before importing data, you need to ensure that the imported data file is saved in the correct encoding, which should usually be UTF-8 encoding. The data file can be opened using a text editor for confirmation.

3. Use SQL*Loader to import data

A common way is to use the SQLLoader tool provided by Oracle to import data. SQLLoader is a fast and efficient data import tool. When importing Chinese data, you need to pay attention to specifying the correct character set.

The following is a sample SQL*Loader control file example:

LOAD DATA
INFILE 'data.txt'
BADFILE 'data.bad'
DISCARDFILE 'data.dsc'
APPEND
INTO TABLE my_table
FIELDS TERMINATED BY ','
(
    id,
    name CHAR(100) CHARACTER SET ZHS16GBK,
    age
)

In the above example, you need to ensure that the specified CHARACTER SET matches the database character set, otherwise the Chinese data may be garbled. Field length and character set settings can be adjusted according to actual conditions.

4. Batch import using PL/SQL Developer

In addition to SQL*Loader, you can also use tools such as PL/SQL Developer to import data. When importing Chinese data, you can set the correct character set through the following steps:

1. Open PL/SQL Developer and connect to the Oracle database;
2. Select Tools -> Preferences -> ; Database -> NLS;
3. In the NLS window, set the Client Character Set and Database Character Set to ensure they are consistent with the database character set;
4. Execute the import script to ensure the data file encoding and script Character set matching.

5. Use Data Pump to import

Another commonly used method is to use the Oracle Data Pump tool to import data. Data Pump provides more import options and flexibility, and can effectively avoid garbled characters when processing Chinese data.

The following is an example Data Pump import command:

impdp hr DIRECTORY=dpump_dir1 DUMPFILE=expdat.dmp
TABLES=employees REMAP_SCHEMA=hr:scott REMAP_TABLESPACE=hr:users

When executing Data Pump import, you can specify the character set and mapping relationship by setting parameters to ensure that the imported Chinese data can be displayed correctly.

Summary:

To deal with the problem of Chinese garbled characters imported into Oracle, it is necessary to comprehensively consider factors such as database character set, data encoding, and tool settings. By checking the database character set, importing data encoding, using the correct tools, and setting character set parameters, you can effectively avoid the problem of garbled Chinese data. I hope the tips shared in this article can be helpful to everyone in practical operations.

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