通过dblink+utl_raw在不同字符集数据库间迁移数据~
数据库test （字符集US7ASCII）
Z:\>set ORACLE_SID=TEST
Z:\>set NLS_LANG=AMERICAN_AMERICA.US7ASCII
Z:\>sqlplus mydb
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Feb 25 13:37:20 2009
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
MYDB > show parameter db_name
NAME TYPE VALUE
---------------------------------------- ----------- --------------------------------------------------
db_name string TEST
MYDB > create table chtest (a number,b varchar2(20),c varchar2(20));
Table created.
MYDB > insert into chtest values (1,'中华人民共和国','China');
1 row created.
Elapsed: 00:00:00.15
MYDB > insert into chtest values (1,'美利坚合众国','USA');
1 row created.
Elapsed: 00:00:00.03
MYDB > insert into chtest values (1,'今天你吃了么？','XXXxxxABC');
1 row created.
Elapsed: 00:00:00.01
MYDB > insert into chtest values (10000,'字符集，测试数据','3943kdfaAC#E');
1 row created.
Elapsed: 00:00:00.03
MYDB > commit;
Commit complete.
Elapsed: 00:00:00.00
MYDB > select * from chtest;
A B C
---------- -------------------- --------------------
1 中华人民共和国 China
1 美利坚合众国 USA
1 今天你吃了么？ XXXxxxABC
10000 字符集，测试数据 3943kdfaAC#E
Elapsed: 00:00:00.01
需要将表chtest迁移到数据库MYDB102（字符集ZHS16GBK）中.
直接通过dblink中文为乱码:
Z:\>set ORACLE_SID=MYDB102
Z:\>set NLS_LANG=AMERICAN_AMERICA.ZHS16GBK
Z:\>sqlplus mydb
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Feb 25 13:41:03 2009
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
MYDB > show parameter db_name
NAME TYPE VALUE
---------------------------------------- ----------- --------------------------------------------------
db_name string MYDB102
MYDB > create public database link TESTDB
2 connect to MYDB identified by xxxxxxxx
3 using 'TEST';
Database link created.
Elapsed: 00:00:00.54
MYDB > SELECT * FROM CHTEST@TESTDB;
A B C
---------- ---------------------------------------- ----------------------------------------
1 ?????????????? China
1 ???????????? USA
1 ?????????????? XXXxxxABC
10000 ???????????????? 3943kdfaAC#E
Elapsed: 00:00:01.03
通过ult_raw来转换.
1.在TEST上建立View v_chtest
MYDB > create view v_chtest as select a,utl_raw.cast_to_raw(b) b, c from chtest;
View created.
Elapsed: 00:00:00.01
MYDB > select * from v_chtest;
A B C
---------- ---------------------------------------- --------------------
1 D6D0BBAAC8CBC3F1B9B2BACDB9FA China
1 C3C0C0FBBCE1BACFD6DAB9FA USA
1 BDF1CCECC4E3B3D4C1CBC3B4A3BF XXXxxxABC
10000 D7D6B7FBBCAFA3ACB2E2CAD4CAFDBEDD 3943kdfaAC#E
Elapsed: 00:00:00.01
2.在MYDB102上使用utl_raw来读取v_chtest
MYDB > select a ,utl_raw.cast_to_varchar2(b) b, c from v_chtest@testdb;
A B C
---------- ---------------------------------------- --------------------
1 中华人民共和国 China
1 美利坚合众国 USA
1 今天你吃了么？ XXXxxxABC
10000 字符集，测试数据 3943kdfaAC#E
Elapsed: 00:00:00.06
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转载于:http://blog.itpub.net/386081/viewspace-557730/