Spring配C3P0連接池

 Spring配C3P0連接池

applicationContext.xml 文件： <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:jee="http://www.springframework.org/schema/jee"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd">
        <bean id="dataSource"
            class="com.mchange.v2.c3p0.ComboPooledDataSource"
            destroy-method="close">
            <property name="driverclass">
                <value>com.mysql.jdbc.Driver</value>
            </property>
            <property name="jdbcUrl">
                <value>jdbc:mysql://192.168.3.110:3306/DBName?useUnicode=true&amp;characterEncoding=GBK</value>
            </property>
            <property name="user">
                <value>root</value>
            </property>
            <property name="password">
                <value>root</value>
            </property>

     <!--連接池中保留的最小連接數。-->
            <property name="minPoolSize">
                <value>5</value>
            </property>

     <!--連接池中保留的最大連接數。Default: 15 -->
            <property name="maxPoolSize">
                <value>30</value>
            </property>

    <!--初始化時獲取的連接數，取值應在minPoolSize與maxPoolSize之間。Default: 3 -->
            <property name="initialPoolSize">
                <value>10</value>
            </property>

     <!--最大空閒時間,60秒內未使用則連接被丟棄。若爲0則永不丟棄。Default: 0 -->
            <property name="maxIdleTime">
                <value>60</value>
            </property>

     <!--當連接池中的連接耗盡的時候c3p0一次同時獲取的連接數。Default: 3 -->
            <property name="acquireIncrement">
                <value>5</value>
            </property>

     <!--JDBC的標準參數，用以控制數據源內加載的PreparedStatements數量。但由於預緩存的statements   屬於單個connection而不是整個連接池。所以設置這個參數需要考慮到多方面的因素。   如果maxStatements與maxStatementsPerConnection均爲0，則緩存被關閉。Default: 0-->
            <property name="maxStatements">
                <value>0</value>
            </property>

<!--每60秒檢查所有連接池中的空閒連接。Default: 0 -->
            <property name="idleConnectionTestPeriod">
                <value>60</value>
            </property>

     <!--定義在從數據庫獲取新連接失敗後重復嘗試的次數。Default: 30 -->
            <property name="acquireRetryAttempts">
                <value>30</value>
            </property>

     <!--獲取連接失敗將會引起所有等待連接池來獲取連接的線程拋出異常。但是數據源仍有效   保留，並在下次調用getConnection()的時候繼續嘗試獲取連接。如果設爲true，那麼在嘗試   獲取連接失敗後該數據源將申明已斷開並永久關閉。Default: false-->
            <property name="breakAfterAcquireFailure">
                <value>true</value>
            </property>

     <!--因性能消耗大請只在需要的時候使用它。如果設爲true那麼在每個connection提交的   時候都將校驗其有效性。建議使用idleConnectionTestPeriod或automaticTestTable   等方法來提升連接測試的性能。Default: false -->
            <property name="testConnectionOnCheckout">
                <value>false</value>
            </property>
        </bean>
        <!-- Hibernate SessionFactory -->
        <bean id="sessionFactory"
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
            <property name="dataSource">
                <ref local="dataSource" />
            </property>
            <property name="mappingResources">
                <list>
                    <value>com/xh/hibernate/vo/User.hbm.xml</value>
                </list>
            </property>
            <property name="hibernateProperties">
                <props>
                    <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                    <prop key="hibernate.show_sql">true</prop>
                    <prop key="hibernate.generate_statistics">true</prop>
                    <prop key="hibernate.connection.release_mode">auto</prop>
                    <prop key="hibernate.autoReconnect">true</prop>
                </props>
            </property>
        </bean>
    </beans>