Difference and relationship between the hibernate session and connection pool?

connection, hibernate, session

Solution

Hibernate is an ORM, it is a layer between a SQL database and your POJOs.

A connection pool provides a way to store and reuse `java.sql.Connection` instances for speed and robustness.

A hibernate `Session` is a wrapper around a `Connection` in order to allow you to save your POJOs without directly writing the SQL.

So a hibernate `Session` is a wrapper around a `Connection`. `Connection`s are held in a connection pool.

When you call `SessionFactory.openSession` hibernate first takes a `Connection` from the supplied connection pool. It then creates a `Session` around that `Connection` and returns it.

Problem

Original source