修改Oracle字符集为UTF-8解决中文乱码问题

select * from nls_database_parameters;

select * from nls_instance_parameters;

select * from nls_session_parameters;

conn sys/sys as sysdba;

SHUTDOWN IMMEDIATE; --先关掉数据库
STARTUP MOUNT EXCLUSIVE; 
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
ALTER DATABASE NATIONAL CHARACTER SET AL32UTF8; --此处修改字符集关键语句
SHUTDOWN immediate; --修改完毕后重启数据库
STARTUP;

SHUTDOWN IMMEDIATE; --同样需要关闭数据库
STARTUP MOUNT EXCLUSIVE; 
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
ALTER DATABASE NATIONAL CHARACTER SET INTERNAL_USEAL32UTF8; --此处加上了INTENAL_USER
SHUTDOWN immediate;
startup;

update sys.props$ set value$= 'AL32UTF8' WHERE name = 'NLS_CHARACTERSET';
commit;

SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
COL VALUE NEW_VALUE CHARSET
SELECT VALUE FROM NLS_DATABASE_PARAMETERS WHERE PARAMETER='NLS_CHARACTERSET';
COL VALUE NEW_VALUE NCHARSET
SELECT VALUE FROM NLS_DATABASE_PARAMETERS WHERE PARAMETER='NLS_NCHAR_CHARACTERSET';
--INTERNAL_USE是没有写在文档中的参数，用以强制完成字符集一致化
ALTER DATABASE CHARACTER SET INTERNAL_USE &CHARSET;
ALTER DATABASE NATIONAL CHARACTER SET INTERNAL_USE &NCHARSET;
SHUTDOWN IMMEDIATE;
STARTUP;
-- 再次启动数据库一遍
SHUTDOWN IMMEDIATE;
STARTUP;

update   sys.props$   set   value$= 'SIMPLIFIED CHINESE'   WHERE   name   =   'NLS_LANGUAGE';
update   sys.props$   set   value$= 'SIMPLIFIED CHINESE'   WHERE   name   =   'NLS_DATE_LANGUAGE';
update   sys.props$   set   value$= 'CHINA'   WHERE   name   =   'NLS_TERRITORY';
update   sys.props$   set   value$= 'CHINA'   WHERE   name   =   'NLS_ISO_CURRENCY';
update   sys.props$   set   value$= '?'   WHERE   name   =   'NLS_CURRENCY';
update   sys.props$   set   value$= '?'   WHERE   name   =   'NLS_DUAL_CURRENCY';
commit;