【druid 】数据库连接池

一、数据库连接池架构

二、数据库连接池的过滤器

spi的思想，加载配置文件的Filter

druid.filters.default=com.alibaba.druid.filter.stat.StatFilter
druid.filters.stat=com.alibaba.druid.filter.stat.StatFilter
druid.filters.mergeStat=com.alibaba.druid.filter.stat.MergeStatFilter
druid.filters.counter=com.alibaba.druid.filter.stat.StatFilter
druid.filters.encoding=com.alibaba.druid.filter.encoding.EncodingConvertFilter
druid.filters.log4j=com.alibaba.druid.filter.logging.Log4jFilter
druid.filters.log4j2=com.alibaba.druid.filter.logging.Log4j2Filter
druid.filters.slf4j=com.alibaba.druid.filter.logging.Slf4jLogFilter
druid.filters.commonlogging=com.alibaba.druid.filter.logging.CommonsLogFilter
druid.filters.commonLogging=com.alibaba.druid.filter.logging.CommonsLogFilter
druid.filters.wall=com.alibaba.druid.wall.WallFilter
druid.filters.config=com.alibaba.druid.filter.config.ConfigFilter

View Code

三、druid连接池返回的连接其实是包装类

com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl

com.alibaba.druid.pool.DruidPooledConnection

参考：https://www.jianshu.com/p/3f2401d14c78

https://www.jianshu.com/p/4df8d4019055