thanks Andreas，This is certainly an effective approach, but I still want to change it at the code level, and I don't want my users to touch Cache management portal

Thank you very much for your reply. Maybe the problem I described is not clear enough for you to misunderstand, and if I understand it correctly, your answer is try to teach me how to switch namespace. The effect I want to achieve is to switch schema without changing existing links

for example, SQLUser.person - > Sample.person: when executing the SQL statement "select * from person" without qualifying the Schema name, switch the default 'SQLUser' schema to the specified 'Sample' schema