C3P0是一个开源的JDBC连接池，它实现了数据源和JNDI绑定，支持JDBC3规范和JDBC2的标准扩展。目前使用它的开源项目有Hibernate，Spring等。(C3P0 is an open source JDBC connection pool that implements data sources and JNDI bindings, and supports JDBC3 specifications and standard extensions of JDBC2. The open source projects currently using it include Hibernate, Spring, and others.)