druid连接池配置
jopen
10年前
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:
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:
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:
<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:
<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