Connection Pool

A connection pool is a cache of database connections maintained so that the connections can be reused when future requests to the database are required. Connection pools are used to enhance the performance of executing commands on a database. By reusing existing connections, the system avoids the overhead of establishing a new connection every time a database interaction is needed, leading to more efficient resource use and faster execution of database operations

Сonfiguration

To configure the connection pool for your application, you need to specify the type of connection pool you wish to use by setting the bibernate.datasource.type property in your application.properties file. This property determines which connection pool implementation will be utilized by your application.

Supported Connection Pools

• HikariCP: Renowned for its high performance and reliability, HikariCP is a lightweight JDBC connection pool. It emphasizes simplicity and speed, offering significant performance benefits over its competitors, including faster connection acquisition times and lower overhead in managing connections.

• Apache Commons DBCP: Apache DBCP provides database connection pooling services as part of the Apache Commons project. It's known for its configurability and robust feature set, including connection testing, validation, and configuration options for managing how connections are created and managed.

• c3p0: c3p0 is a mature, highly configurable JDBC connection pool library. It includes features like statement caching, configurable connection testing, and a variety of options for customizing the size and management of the pool to optimize performance according to application-specific requirements.

Each of these connection pools offers distinct features and optimizations, making them suitable for different scenarios based on specific performance and configuration needs.

• If no value is specified, the application will default to using a custom DataSource without a connection pool.

application.properties

# Connection pool type: HikariCP, Apache, c3p0, or leave blank for default DataSource
bibernate.datasource.type=HikariCP
# Database connection details
bibernate.connection.url=jdbc:postgresql://localhost:5432/postgres
bibernate.connection.username=postgres
bibernate.connection.password=postgres
bibernate.connection.driver_class=org.postgresql.Driver

Don't forget what if bibernate.datasource.type is not set, the application will use a basic DataSource

Conclusion

This guide provides detailed instructions for setting up and configuring a connection pool in your Java application. By following these steps, you can efficiently manage database connections, enhancing the performance and scalability of your application. Remember to replace placeholders such as latest-version with actual values suitable for your project setup.