Use MySql Update Lock or Java Thread-Safe??? (3 replies)

PROBLEM STATEMENT:
I have tables that can be read or updated by several different Java apps.
*** During updating, my other apps must be able to generate reports from same tables using old data (a dirty read);
*** Also, it is possible that another user may want to update the same tables using same app, I don't want a race. I want them updated in the order that the transactions are uploaded to the cloud.


QUESTIONS:
Should I be using a mySQL SELECT...FOR SHARE, and if I use ...FOR SHARE, then in the Java code, do I still need a thread-safe environment???
For example, I am now using an ArrayList, I might need to modify code to using a Vector.
I don't want to change codes if at all possible.

THANKS for sharing.