方式一:
在Spring的"applicationContext.xml"中的dataSource bean定义
<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource"> <property name="driver"> <value>com.mysql.jdbc.Driver</value> </property> <property name="driverUrl"> <value>jdbc:mysql://localhost:3306/dbname?user=yourname&password=yourpass</value> </property> <property name="user" value="yourname" /> <property name="password" value="yourpass" /> <property name="alias" value="Pool_dbname" /> <property name="houseKeepingSleepTime" value="90000" /> <property name="prototypeCount" value="0" /> <property name="maximumConnectionCount" value="50" /> <property name="minimumConnectionCount" value="2" /> <property name="simultaneousBuildThrottle" value="50" /> <property name="maximumConnectionLifetime" value="14400000" /> <property name="houseKeepingTestSql" value="select CURRENT_DATE" /> </bean>
第一种方式需要把用户名和密码写在连接串里面,
ProxoolDataSource类提供的user,password属性似乎没有什么用。
无论提供什么,它都会以空用户名、密码去连接数据库。
方式二:
在Spring的"applicationContext.xml"中的dataSource bean定义
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>org.logicalcobwebs.proxool.ProxoolDriver</value> </property> <property name="url"> <value>proxool.Pool_dbname</value> </property> </bean>
第二种方式需要预先在"web.xml"先配置好Proxool连接池,配置如下:
<servlet> <servlet-name>proxoolServletConfigurator</servlet-name> <servlet-class> org.logicalcobwebs.proxool.configuration.ServletConfigurator </servlet-class> <init-param> <param-name>xmlFile</param-name> <param-value>WEB-INF/proxool.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>context</servlet-name> <servlet-class> org.springframework.web.context.ContextLoaderServlet </servlet-class> <load-on-startup>2</load-on-startup> </servlet>
注意,第二种方式下Spring的上下文加载如果想使用listener方式(Struts2要求),
则与连接池有关的Bean全得延迟初始化。因为listener比servlet优先初始化,
如果相关Bean不是lazy-init的话,则启动服务器时会出现Bean找不到连接定义的异常。
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
其中proxool的配置文件可以采用xmlFile"proxool.xml"或者propertyFile"proxool.properties"
"proxool.xml"格式如下:
<?xml version="1.0" encoding="UTF-8"?> <proxool-config> <proxool> <alias>Pool_dbname</alias> <driver-url>jdbc:mysql://localhost:3306/dbname</driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="yourname"/> <property name="password" value="yourpass"/> </driver-properties> <house-keeping-sleep-time>60000</house-keeping-sleep-time> <maximum-connection-count>20</maximum-connection-count> <minimum-connection-count>2</minimum-connection-count> <prototype-count>0</prototype-count> <simultaneous-build-throttle>20</simultaneous-build-throttle> <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql> <statistics>15s,10m,1d</statistics> <statistics-log-level>INFO</statistics-log-level> </proxool> <proxool> <!--可以配置多个库--> </proxool> </proxool-config>
"proxool.properties"格式如下:
jdbc-0.proxool.alias=Pool_dbname jdbc-0.proxool.driver-url=jdbc:mysql://localhost:3306/dbname jdbc-0.proxool.driver-class=com.mysql.jdbc.Driver jdbc-0.user=yourname jdbc-0.password=yourpass jdbc-0.proxool.house-keeping-sleep-time=60000 jdbc-0.proxool.house-keeping-test-sql=select CURRENT_DATE jdbc-0.proxool.maximum-connection-count=10 jdbc-0.proxool.minimum-connection-count=3 jdbc-0.proxool.maximum-connection-lifetime=18000000 jdbc-0.proxool.prototype-count=3 jdbc-0.proxool.simultaneous-build-throttle=10 jdbc-0.proxool.recently-started-threshold=60000 jdbc-0.proxool.overload-without-refusal-lifetime=50000 jdbc-0.proxool.maximum-active-time=60000 jdbc-0.proxool.verbose=true jdbc-0.proxool.trace=true jdbc-0.proxool.fatal-sql-exception=Fatal error jdbc-2.proxool.alias=Pool_dbname2 …… <!--可以配置多个库-->
三、更详细的proxool.xml的配置属性说明:
<?xml version="1.0" encoding="ISO-8859-1"?><!-- Properties for Proxool Configurator testing. Defines the same parameters as TestHelper.buildCompleteAlternativeProperties() --> <something-else-entirely xmlns="http://sumthin.else.entirely" xmlns:proxool="The latest version is available at http://proxool.sourceforge.net/xml-namespace"> <proxool:proxool> <proxool:alias>xml-test-ns</proxool:alias> <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url> <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class> <proxool:driver-properties> <proxool:property name="user" value="sa"/> <proxool:property name="password" value=""/> </proxool:driver-properties> <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time> <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql> <proxool:maximum-connection-count>10</proxool:maximum-connection-count> <proxool:minimum-connection-count>3</proxool:minimum-connection-count> <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours --> <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle> <proxool:recently-started-threshold>40000</proxool:recently-started-threshold> <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime> <proxool:maximum-active-time>60000</proxool:maximum-active-time> <proxool:verbose>true</proxool:verbose> <proxool:trace>true</proxool:trace> <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception> <proxool:prototype-count>2</proxool:prototype-count> </proxool:proxool> <nothing-to-do-with-proxool> <proxool:proxool> <proxool:alias>xml-test-ns-2</proxool:alias> <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url> <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class> <proxool:driver-properties> <proxool:property name="user" value="sa"/> <proxool:property name="password" value=""/> </proxool:driver-properties> <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time> <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql> <proxool:maximum-connection-count>10</proxool:maximum-connection-count> <proxool:minimum-connection-count>3</proxool:minimum-connection-count> <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours --> <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle> <proxool:recently-started-threshold>40000</proxool:recently-started-threshold> <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime> <proxool:maximum-active-time>60000</proxool:maximum-active-time> <proxool:verbose>true</proxool:verbose> <proxool:trace>true</proxool:trace> <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception> <proxool:prototype-count>2</proxool:prototype-count> </proxool:proxool> </nothing-to-do-with-proxool> </something-else-entirely>
属性列表说明:
fatal-sql-exception: 它是一个逗号分割的信息片段.当一个SQL异常发生时,他的异常信息将与这个信息片段进行比较.如果在片段中存在,那么这个异常将被认为是个致命错误(Fatal SQL Exception ).这种情况下,数据库连接将要被放弃.无论发生什么,这个异常将会被重掷以提供给消费者.用户最好自己配置一个不同的异常来抛出.
fatal-sql-exception-wrapper-class:正如上面所说,你最好配置一个不同的异常来重掷.利用这个属性,用户可以包装SQLException,使他变成另外一个异常.这个异常或者继承SQLException或者继承字RuntimeException.proxool自带了2个实现:'org.logicalcobwebs.proxool.FatalSQLException' 和'org.logicalcobwebs.proxool.FatalRuntimeException' .后者更合适.
house-keeping-sleep-time: house keeper 保留线程处于睡眠状态的最长时间,house keeper 的职责就是检查各个连接的状态,并判断是否需要销毁或者创建.
house-keeping-test-sql: 如果发现了空闲的数据库连接.house keeper 将会用这个语句来测试.这个语句最好非常快的被执行.如果没有定义,测试过程将会被忽略。
injectable-connection-interface: 允许proxool实现被代理的connection对象的方法.
injectable-statement-interface: 允许proxool实现被代理的Statement 对象方法.
injectable-prepared-statement-interface: 允许proxool实现被代理的PreparedStatement 对象方法.
injectable-callable-statement-interface: 允许proxool实现被代理的CallableStatement 对象方法.
jmx: 略
jmx-agent-id: 略
jndi-name: 数据源的名称
maximum-active-time: 如果housekeeper 检测到某个线程的活动时间大于这个数值.它将会杀掉这个线程.所以确认一下你的服务器的带宽.然后定一个合适的值.默认是5分钟.
maximum-connection-count: 最大的数据库连接数.
maximum-connection-lifetime: 一个线程的最大寿命.
minimum-connection-count: 最小的数据库连接数
overload-without-refusal-lifetime: 略
prototype-count: 连接池中可用的连接数量.如果当前的连接池中的连接少于这个数值.新的连接将被建立(假设没有超过最大可用数).例如.我们有3个活动连接2个可用连接,而我们的prototype-count是4,那么数据库连接池将试图建立另外2个连接.这和 minimum-connection-count不同. minimum-connection-count把活动的连接也计算在内.prototype-count 是spare connections 的数量.
recently-started-threshold: 略
simultaneous-build-throttle: 略
statistics: 连接池使用状况统计。 参数“10s,1m,1d”
statistics-log-level: 日志统计跟踪类型。 参数“ERROR”或 “INFO”
test-before-use: 略
test-after-use: 略
trace: 如果为true,那么每个被执行的SQL语句将会在执行期被log记录(DEBUG LEVEL).你也可以注册一个ConnectionListener (参看ProxoolFacade)得到这些信息.
verbose: 详细信息设置。 参数 bool 值
四、还可以配置管理proxool的servlet
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <servlet-name>ServletConfigurator</servlet-name> <servlet-class> org.logicalcobwebs.proxool.configuration.ServletConfigurator </servlet-class> <init-param> <param-name>xmlFile</param-name> <param-value>WEB-INF/proxool.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>Admin</servlet-name> <servlet-class> org.logicalcobwebs.proxool.admin.servlet.AdminServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>Admin</servlet-name> <url-pattern>/admin</url-pattern> </servlet-mapping> <!-- 配置受保护域,只有Tomcat管理员才能察看连接池的信息 --> <security-constraint> <web-resource-collection> <web-resource-name>proxool</web-resource-name> <url-pattern>/admin</url-pattern> </web-resource-collection> <auth-constraint> <role-name>manager</role-name> </auth-constraint> </security-constraint> <login-config> <auth-method>BASIC</auth-method> <realm-name>proxool manager Application</realm-name> </login-config> <security-role> <description>The role that is required to log in to the Manager Application</description> <role-name>manager</role-name> </security-role> <error-page> <error-code>401</error-code> <location>/401.jsp</location> </error-page> </web-app>