Transaction Introduction#

What Is The Transaction?#

A transaction is a set of operations that either fail or succeed as a unit. Transactions are a fundamental part of persistence. A database transaction consists of a set of SQL DML (Data Manipulation Language) operations that are committed or rolled back as a single unit. An object level transaction is one in which a set of changes made to a set of objects are committed to the database as a single unit.
JPA provides two mechanisms for transactions. When used in Java EE JPA provides integration with JTA (Java Transaction API). JPA also provides its own EntityTransaction implementation to Java SE and for use in a non-managed mode in Java EE. Transactions in JPA are always at the object level, this means that all changes made to all persistent objects in the persistence context are part of the transaction.
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