spring中连接池的配置

在默认通过myeclipse生成的配置里,spring使用的是apache的dbcp连接池

  <bean id="dataSource"

  class="org.apache.commons.dbcp.BasicDataSource">

  <property name="driverClassName"

  value="com.mysql.jdbc.Driver">

  </property>

  <property name="url"

  value="jdbc:mysql://localhost:3306/mysql">

  </property>

  <property name="username" value="root"></property>

  <property name="password" value="root"></property>

  </bean>

  如果改为C3P0则为:

  <bean id="propertyConfigurer"

  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

  <property name="location">

  <value>classpath:jdbc.properties</value>

  </property>

  </bean>

  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

  <property name="driverClass" value="com.mysql.jdbc.Driver" />

  <property name="jdbcUrl" value="${jdbc.url}" />

  <property name="user" value="${jdbc.username}" />

  <property name="password" value="${jdbc.password}" />

  <property name="autoCommitOnClose" value="true"/>

  <property name="checkoutTimeout" value="${cpool.checkoutTimeout}"/>

  <property name="initialPoolSize" value="${cpool.minPoolSize}"/>

  <property name="minPoolSize" value="${cpool.minPoolSize}"/>

  <property name="maxPoolSize" value="${cpool.maxPoolSize}"/>

  <property name="maxIdleTime" value="${cpool.maxIdleTime}"/>

  <property name="acquireIncrement" value="${cpool.acquireIncrement}"/>

  <property name="maxIdleTimeExcessConnections" value="${cpool.maxIdleTimeExcessConnections}"/>

  </bean>

  jdbc.properties:

  # Database URL

  jdbc.url=jdbc:mysql://192.168.0.25"3306/db

  # Database login information

  jdbc.username=root

  jdbc.password=

  # Time to wait for an open connection before timing out

  # (in milliseconds)

  cpool.checkoutTimeout=5000

  # Connection pool size

  cpool.minPoolSize=5

  cpool.maxPoolSize=40

  # How long to keep unused connections around(in seconds)

  # Note: MySQL times out idle connections after 8 hours(28,800 seconds)

  # so ensure this value is below MySQL idle timeout

  cpool.maxIdleTime=25200

  # How long to hang on to excess unused connections after traffic spike

  # (in seconds)

  cpool.maxIdleTimeExcessConnections=1800

  # Acquiring new connections is slow, so eagerly retrieve extra connections

  # when current pool size is reached

  cpool.acquireIncrement=5

  或者将上面的3部分写成一个:

  <bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">

  <property name="driverClass">

  <value>${jdbc.driverClassName}</value>

  </property>

  <property name="jdbcUrl">

  <value>${jdbc.url}</value>

  </property>

  <property name="user">

  <value>${jdbc.username}</value>

  </property>

  <property name="password">

  <value>${jdbc.password}</value>

  </property>

  <property name="initialPoolSize"><value>10</value></property>

  <property name="minPoolSize"><value>5</value></property>

  <property name="maxPoolSize"><value>30</value></property>

  <property name="acquireIncrement"><value>5</value></property>

  <property name="maxIdleTime"><value>10</value></property>

  <property name="maxStatements"><value>0</value></property>

  </bean>

如果使用的是受管理的J2EE服务器,则在spring中配置为JNDI连接:

  <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">

  <property name="jndiName">

  <value>java:comp/env/jndi/xxx</value>

  </property>

  </bean>

  如果在应用里有独自使用hibernate,则在spring中配置hibernate连接池,使用C3P0如下:

  <bean   id="DataSource"

  class="org.apache.commons.dbcp.BasicDataSource">

  <property   name="driverClassName">

  <value>oracle.jdbc.driver.OracleDriver</value>

  </property>

  <property   name="url">

  <value>jdbc:oracle:thin:@172.16.20.241:1521:dbsvr</value>

  </property>

  <property   name="username">

  <value>hl3000</value>

  </property>

  <property   name="password">

  <value>hldw3101</value>

  </property>

  </bean>

  <bean   id="SessionFactory"

  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

  <property   name="dataSource">

  <ref   bean="DataSource"   />

  </property>

  <property   name="hibernateProperties">

  <props>

  <prop   key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>

  <prop   key="hibernate.show_sql">true</prop>

  <!--   C3P0连接池配置   -->

  <prop   key="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>

  <prop   key="hibernate.c3p0.max_size">20</prop>

  <prop   key="hibernate.c3p0.min_size">5</prop>

  <prop   key="hibernate.c3p0.timeout">120</prop>

  <prop   key="hibernate.c3p0.max_statements">100</prop>

  <prop   key="hibernate.c3p0.idle_test_period">120</prop>

  <prop   key="hibernate.c3p0.acquire_increment">2</prop>

  <prop   key="myeclipse.connection.profile">hl3000</prop>

  </props>

  </property>

  <property   name="mappingResources">

  <list>

  <value>com/hl3000/DBLogic/POJO/PermUserAccount.hbm.xml</value>

  </list>

  </property>

  </bean>

  spring中配置独立使用hibernate时使用jndi的配置:

  hibernate.dialect = net.sf.hibernate.dialect.MySQLDialect

  hibernate.connection.datasource=java:comp/env/jdbc/SAMPLEDB

  hibernate.show_sql=true

  如果是使用不受管理的Servlet容器如Tomcat,也可以使用jndi的方式配置,需要在tomcat中配置数据源,在server.xml中增改大致如下:

  <Resource name="jdbc/testDb" auth="Container"

  type="javax.sql.DataSource"/>

  <ResourceParams name="jdbc/testDB">\\数据源的名称

  <parameter><name>username</name><value>root</value></parameter>数据库的名称

  <parameter><name>password</name><value>password</value></parameter>数据库密码

  <parameter><name>driverClassName</name>

  <value>org.gjt.mm.mysql.Driver</value></parameter>\\要加载的驱动

  <parameter><name>url</name>

  <value>jdbc:mysql://172.20.0.73/rk?</value></parameter>\\要连接的URL

  </ResourceParams>

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