1.JDBC
JDBC technology is the link database and Java applications
Liu Buqu 2.JDBC Programming
(1) Register drive
(2) database connection
(3) operation target acquisition database
(4) to execute SQL statements
(5) processing the query result set
(6) close the resource
3.SQL injected question
refers to the keyword string entered by the user in a web page contains the database
4. deletions change check, CRUD
representing: create / retrive / update / delete
5. multi-threaded how to ensure the safety
JDBC row-level locking, also known as pessimistic locking
(This is written before, save for the draft, it is now made public, would add more detail later)