Hibernate uses the c3p0 data source,

Hibernate uses the c3p0 data source,
After configuring hibernate to connect to the database environment, we can perform the following operations to build the environment for using the c3p0 data source in hibernate. 1). Import the jar package:
Hibernate-release-4.2.4.Final \ lib \ optional \ c3p0 \ *. jar (here there are generally 3 jar packages) c3p0-0.9.2.1.jar
Hibernate-c3p0-4.2.15.Final.jar
Mchange-commons-java-0.2.3.4.jar

2) Add the configuration (added in the hibernate. cfg. xml file ):
Hibernate. c3p0. max_size: Maximum number of connections in the database connection pool hibernate. c3p0. min_size: Minimum number of connections in the database connection pool hibernate. c3p0. acquire_increment: How many databases are connected to hibernate at the same time when the connections in the database connection pool are exhausted. c3p0. timeout: after the connection object in the database connection pool is not used for a long time, hibernate should be destroyed. c3p0. idle_test_period: indicates how long the connection pool detection thread times out to detect all connected objects in the pool. the connection pool itself does not remove itself from the connection pool. Instead, a thread is dedicated to doing this at a certain interval, this thread compares the time difference between the last used time and the current time of the connected object with timeout to determine whether to destroy the connected object. Hibernate. c3p0. max_statements: Number of cached Statement objects
The following is the original configuration code: the following code is added to the hibernate. cfg. xml file.

</Pre> <pre name = "code" class = "html"> <! -- Configure the c3p0 data source --> <property name = "hibernate. c3p0. max_size "> 10 </property> <property name =" hibernate. c3p0. min_size "> 2 </property> <property name =" c3p0. acquire_increment "> 2 </property> <property name =" c3p0. idle_test_period "> 2000 </property> <property name =" c3p0. timeout "> 2000 </property> <property name =" c3p0. max_statements "> 10 </property>

We can write test cases to check whether the building is successful: Create a junit test case, re-write the dowork method in the test case to call the connection object in jdbc, and print it out.

@ Testpublic void testDoWork () {session. doWork (new Work () {@ Overridepublic void execute (Connection connection) throws SQLException {System. out. println (connection); // call the stored procedure .}});}

If the following code with c3p0 is printed, it indicates that it has been successfully set up.

com.mchange.v2.c3p0.impl.NewProxyConnection@5848ddac