阿里巴巴推出的国产数据库连接池,据网上测试对比,比目前的DBCP或C3P0数据库连接池性能更好,Druid与其他数据库连接池使用方法基本一样(与DBCP非常相似),将数据库的连接信息全部配置给DataSource对象。
基于纯Java代码使用:
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package demo.test; import java.io.InputStream; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; import javax.sql.DataSource; import com.alibaba.druid.pool.DruidDataSourceFactory; public class DBUtil { private static DataSource ds = null ; static { try { InputStream in = DBUtil. class .getClassLoader() .getResourceAsStream( "ds.properties" ); Properties props = new Properties(); props.load(in); ds = DruidDataSourceFactory.createDataSource(props); } catch (Exception ex){ ex.printStackTrace(); } } public static Connection openConnection() throws SQLException{ return ds.getConnection(); } } |
ds.properties内容:
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driverClassName = oracle.jdbc.driver.OracleDriver url = jdbc:oracle:thin: @127 .0. 0.1 : 1521 :ORCL username = ****** password = ****** initialSize = 5 maxActive = 10 minIdle = 3 maxWait = 60000 removeAbandoned = true removeAbandonedTimeout = 180 timeBetweenEvictionRunsMillis = 60000 minEvictableIdleTimeMillis = 300000 validationQuery = SELECT 1 FROM DUAL testWhileIdle = true testOnBorrow = false testOnReturn = false poolPreparedStatements = true maxPoolPreparedStatementPerConnectionSize = 50 filters = stat |
基于Spring的配置:
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< bean id = "druidDataSource" class = "com.alibaba.druid.pool.DruidDataSource" init-method = "init" destroy-method = "close" > <!-- 数据库基本信息配置 --> < property name = "driverClassName" value = "${oracle.driver}" /> < property name = "url" value = "${oracle.url}" /> < property name = "username" value = "${oracle.username}" /> < property name = "password" value = "${oracle.password}" /> <!-- 初始化连接数量 --> < property name = "initialSize" value = "${druid.initialSize}" /> <!-- 最大并发连接数 --> < property name = "maxActive" value = "${druid.maxActive}" /> <!-- 最大空闲连接数 --> < property name = "maxIdle" value = "${druid.maxIdle}" /> <!-- 最小空闲连接数 --> < property name = "minIdle" value = "${druid.minIdle}" /> <!-- 配置获取连接等待超时的时间 --> < property name = "maxWait" value = "${druid.maxWait}" /> <!-- 超过时间限制是否回收 --> < property name = "removeAbandoned" value = "${druid.removeAbandoned}" /> <!-- 超过时间限制多长; --> < property name = "removeAbandonedTimeout" value = "${druid.removeAbandonedTimeout}" /> <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> < property name = "timeBetweenEvictionRunsMillis" value = "${druid.timeBetweenEvictionRunsMillis}" /> <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> < property name = "minEvictableIdleTimeMillis" value = "${druid.minEvictableIdleTimeMillis}" /> <!-- 用来检测连接是否有效的sql,要求是一个查询语句--> < property name = "validationQuery" value = "${druid.validationQuery}" /> <!-- 申请连接的时候检测 --> < property name = "testWhileIdle" value = "${druid.testWhileIdle}" /> <!-- 申请连接时执行validationQuery检测连接是否有效,配置为true会降低性能 --> < property name = "testOnBorrow" value = "${druid.testOnBorrow}" /> <!-- 归还连接时执行validationQuery检测连接是否有效,配置为true会降低性能 --> < property name = "testOnReturn" value = "${druid.testOnReturn}" /> <!-- 打开PSCache,并且指定每个连接上PSCache的大小 --> < property name = "poolPreparedStatements" value = "${druid.poolPreparedStatements}" /> < property name = "maxPoolPreparedStatementPerConnectionSize" value = "${druid.maxPoolPreparedStatementPerConnectionSize}" /> <!--属性类型是字符串,通过别名的方式配置扩展插件,常用的插件有: 监控统计用的filter:stat 日志用的filter:log4j 防御SQL注入的filter:wall --> < property name = "filters" value = "${druid.filters}" /> </ bean > |
启用Web监控统计功能需要在Web应用的web.xml中加入以下内容:
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< filter > < filter-name >DruidWebStatFilter</ filter-name > < filter-class >com.alibaba.druid.support.http.WebStatFilter</ filter-class > < init-param > < param-name >exclusions</ param-name > < param-value >*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</ param-value > </ init-param > </ filter > < filter-mapping > < filter-name >DruidWebStatFilter</ filter-name > < url-pattern >/*</ url-pattern > </ filter-mapping > < servlet > < servlet-name >DruidStatView</ servlet-name > < servlet-class >com.alibaba.druid.support.http.StatViewServlet</ servlet-class > </ servlet > < servlet-mapping > < servlet-name >DruidStatView</ servlet-name > < url-pattern >/druid/*</ url-pattern > </ servlet-mapping > |
访问监控页面:http://ip:port/projectName/druid/index.html