Oracle--pl/sql Query Chinese garbled

1.
View server-side encoding
Select Userenv (' language ') from dual;
The result I actually found was: American_america. Al32utf8
2.
EXECUTE statement SELECT * FROM V$nls_parameters
See if the value in the parameter item in the first row is the same as the one obtained in the first step for nls_language.
If not, you need to set the environment variable.
Otherwise, the encoding used by the Plsql client is inconsistent with the server-side encoding and garbled when inserting Chinese.
3.
Setting environment variables
New, environment variable, advanced system settings, properties, computers, and so on, can be created in the user variable of administrator
Set Variable name: Nls_lang, Variable value: The 1th step to find the value (mine is American_america. AL32UTF8).
4.
Restart Plsql, insert data Normal

Oracle--pl/sql Query Chinese garbled