oracle 客户端与服务端字符集不一致中文乱码
pl/sql 链接oracle时报错
打开我的电脑 - 属性 - 高级系统设置 - 环境变量,查看NSL_LANG的字符集与数据库字符集是否一致
数据库字符集查询
select userenv('language') from dual;
字符集补充
1、oracle server 端 字符集查询
select userenv('language') from dual
其中NLS_CHARACTERSET 为server端字符集
NLS_LANGUAGE 为 server端字符显示形式
2、server端字符集修改
SQL>
将数据库启动到RESTRICTED模式下做字符集更改:
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 236000356 bytes
Fixed Size 451684 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 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 CHARACTER SET ZHS16GBK;
ALTER DATABASE CHARACTER SET ZHS16GBK
ERROR at line 1:
ORA-12712: new character set must be a superset of old character set
提示我们的字符集:新字符集必须为旧字符集的超集,这时我们可以跳过超集的检查做更改:
SQL> ALTER DATABASE character set INTERNAL_USE ZHS16GBK;
Database altered.
SQL> select * from v$nls_parameters;
略
19 rows selected.
重启检查是否更改完成:
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 236000356 bytes
Fixed Size 451684 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 bytes
Database mounted.
Database opened.
SQL> select * from v$nls_parameters;
略
19 rows selected.