找到hibernate正在使用的连接池

Question

How can I find the connection pool hibernate is using at runtime without looking at the hibernate configuration? Is there a API like "getConnectionPoolUsed()" which returns the connection pool hibernate is using?

Answer 1

I cannot find any such method in the javadocs. And I cannot find any exposed methods that return a ConnectionProvider . (There are some deprecated methods, and some methods on "internal" classes, but you shouldn't be using those.)

IMO, the clean solution is to look at the configuration.

Answer 2

In order to use C3P0ConnectionProvider you need hibernate-c3p0.jar (available here )

Then configure the following properties in hibernate.cfg.xml

    <property name="hibernate.connection.pool_size">10</property>

    <property name="hibernate.c3p0.min_size">5</property>
    <property name="hibernate.c3p0.max_size">20</property>
    <property name="hibernate.c3p0.timeout">300</property>
    <property name="hibernate.c3p0.max_statements">50</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>

There is no need to specify *hibernate.connection.provider_class*, Hibernate will use C3P0 as long as there is any hibernate.c3p0.x property.

The values are just an example, you should use the configuration most appropriate for your needs.

Answer 3

No there is no such API. You could do it using reflection (but that would go too deep for this answer).

Maybe you should ask yourself why you want this.