Existing requirements synchronize other database user information to our system. Their primary key ID is string and our primary key is long

During synchronization, some users' primary keys of the other party are pure numbers, which can be accessed through Long.value of transformation , Some users id Upper and lower case letters , When searching for the other party's user information I insert them into our library one by one .
Here is how to filter out the users found in the query id If there are characters, they will not be saved .