1.Hibernate3 已經取消了對DBCP的支持，原因是當DBCP連接因爲某個原因斷掉後，不會自動重新連接，必須重啓服務器。
2.在dbcp方式的連接池下，如果有下面的代碼，數據不會保存到數據庫
<property name="defaultAutoCommit"> <value>false</value> </property>
3.c3p0連接池的配置
- <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName"> <value>org.gjt.mm.mysql.Driver</value> </property> <property name="url"> <value>jdbc:mysql://localhost:3306/test</value> </property> <property name="username"> <value>lixueli</value> </property> <property name="password"> <value>lixueli</value> </property> <property name="maxActive"> <value>25</value> </property> <property name="maxIdle"> <value>20</value> </property> <property name="maxWait"> <value>1000</value> </property> <property name="defaultAutoCommit"> <value>false</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.MySQLDialect </prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> </props> </property> <property name="mappingResources"> <list> <value>com/lixueli/business/model/Book.hbm.xml</value> <value>com/lixueli/business/model/User.hbm.xml</value> <value>com/lixueli/business/model/Event.hbm.xml</value> <value>com/lixueli/business/model/Person.hbm.xml</value> <value>com/lixueli/business/model/Address.hbm.xml</value> </list> </property> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName"> <value>oracle.jdbc.driver.OracleDriver</value> </property> <property name="url"> <value>jdbc:oracle:thin:@127.0.0.1:1521:orcl</value> </property> <property name="username"> <value>lixueli</value> </property> <property name="password"> <value>lixueli</value> </property> <property name="maxActive"> <value>25</value> </property> <property name="maxIdle"> <value>20</value> </property> <property name="maxWait"> <value>1000</value> </property> </bean> --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="jdbcUrl" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"></property> <property name="driverClass" value="oracle.jdbc.driver.OracleDriver"></property> <property name="user" value="lixueli"></property> <property name="password" value="lixueli"></property> <!--連接池中保留的最大連接數。Default: 15 --> <property name="maxPoolSize" value="20"></property> <!--連接池中保留的最小連接數。--> <property name="minPoolSize" value="2"></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"></property> <property name="idleConnectionTestPeriod" value="60"> <!--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> <!--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> <!--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> <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.Oracle10gDialect </prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> </props> </property> <property name="mappingResources"> <list> <value>com/lixueli/business/model/Book.hbm.xml</value> <value>com/lixueli/business/model/User.hbm.xml</value> <value>com/lixueli/business/model/Event.hbm.xml</value> <value>com/lixueli/business/model/Person.hbm.xml</value> <value>com/lixueli/business/model/Address.hbm.xml</value> </list> </property> </bean> </beans>