ORACLE NVARCHAR2 中文乱码

VARCHAR2 需要字符集UTF8

NVARCHAR2需要字符集AL16UTF16

select * from sys.nls_database_parameters;

SQL> alter system checkpoint;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

 

2、启动数据库
SQL> STARTUP MOUNT EXCLUSIVE;
ORACLE instance started.

Total System Global Area 2471931904 bytes
Fixed Size                  2291376 bytes
Variable Size             671091024 bytes
Database Buffers         1778384896 bytes
Redo Buffers               20164608 bytes
Database mounted.
SQL> alter system enable restricted session;

System altered.

SQL> alter system set job_queue_processes=0;

System altered.

SQL> alter system set aq_tm_processes=0;

System altered.

SQL> alter database open;

Database altered.

SQL> ALTER DATABASE NATIONAL CHARACTER SET INTERNAL_USE AL16UTF16;

Database altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> STARTUP

ORACLE instance started.

Total System Global Area 2471931904 bytes
Fixed Size                  2291376 bytes
Variable Size             671091024 bytes
Database Buffers         1778384896 bytes
Redo Buffers               20164608 bytes
Database mounted.
Database opened.