Java 是否未设置c3p0连接池属性？

我正在使用spring/hibernate应用程序并配置c3p0连接池。c3p0连接池已启用。我核实了我的日志

10 May 2012 14:55:56  INFO AbstractPoolBackedDataSource:462 - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource 

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

但问题是，以编程方式，我正在配置数据源并试图查看其属性，但无论我在配置文件中设置了什么属性，它们都没有设置。请查找以下配置和调试的值

<prop key="hibernate.connection.pool.size">20</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.use_sql_comments">true</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
                <prop key="hibernate.c3p0.min_size">5</prop>
                <prop key="hibernate.c3p0.max_size">20</prop>
                <prop key="hibernate.c3p0.timeout">300</prop>
                <prop key="hibernate.c3p0.max_statements">50</prop>
                <prop key="hibernate.c3p0.idle_test_period">3000</prop>
                <prop key="hibernate.jdbc.batch_size">50</prop>
                <prop key="hibernate.c3p0.preferredTestQuery">SELECT GETDATE()</prop>
                 <prop key="hibernate.c3p0.testConnectionOnCheckout">true</prop>

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

在属性中，我设置了首选测试查询。这在图像中也是空的

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

我有什么遗漏吗。谢谢

我使用它如下

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

${HIBERNATE.dial}
符合事实的
${HIBERNATE.hBM2DDL.AUTO}

---

它对我来说绝对完美，请粘贴配置以获得更多帮助

尝试将以下内容添加到配置文件中：

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

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

org.hibernate.connection.C3P0ConnectionProvider

我遇到了同样的问题，花了一些时间才找到解决方案

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

我使用Hibernate4.0.1和MySQL5.1（没有spring框架），我面临着这个问题。首先确保正确配置了c3p0 JAR，这是必不可少的

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

我在hibernate.cfg.xml中使用了这些属性

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<property name="hibernate.c3p0.validate">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.preferredTestQuery">SELECT 1;</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.idle_test_period">10</property>
<property name="hibernate.c3p0.acquireRetryAttempts">5</property>
<property name="hibernate.c3p0.acquireRetryDelay">200</property>
<property name="hibernate.c3p0.timeout">40</property>

<property name="hibernate.c3p0.validate">true</property>

<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>

true
org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider
5.
20
50
选择1；
符合事实的
10
5.
200
40

但是这没有用，因为C3p0仍然使用默认属性，而不是我在hibernate.cfg.xml中设置的属性，您可以在日志中检查它。所以，我搜索了很多网站，寻找正确的解决方案，最后我找到了这个。删除cfg.xml中的C3p0属性，并在根路径（连同cfg.xml）中创建C3p0-config.xml，并按如下方式设置属性

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<c3p0-config>
<default-config> 
<property name="automaticTestTable">con_test</property>
<property name="checkoutTimeout">40</property> 
<property name="idleConnectionTestPeriod">10</property> 
<property name="initialPoolSize">10</property>
<property name="maxPoolSize">20</property> 
<property name="minPoolSize">5</property> 
<property name="maxStatements">50</property>
<property name="preferredTestQuery">SELECT 1;</property>
<property name="acquireRetryAttempts">5</property>
<property name="acquireRetryDelay">200</property>
<property name="maxIdleTime">30</property>
</default-config>
</c3p0-config>

con_试验
40
10
10
20
5.
50
选择1；
5.
200
30

但是如果运行，ORM将使用jdbc连接，而不是C3p0连接池，因为我们应该在hibernate.cfg.xml中添加这些属性

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<property name="hibernate.c3p0.validate">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.preferredTestQuery">SELECT 1;</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.idle_test_period">10</property>
<property name="hibernate.c3p0.acquireRetryAttempts">5</property>
<property name="hibernate.c3p0.acquireRetryDelay">200</property>
<property name="hibernate.c3p0.timeout">40</property>

<property name="hibernate.c3p0.validate">true</property>

<property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>

true
org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider

现在一切都很好（至少对我来说很好），问题解决了

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

检查以下参考资料

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property> 

---

我希望这能解决您的问题。

您能检查下一个数据库中是否设置了属性吗。

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="pooledConn"/>
    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect" >${HIBERNATE.DIALECT}</prop>
        <!--  <prop key="hibernate.show_sql">${HIBERNATE.SHOW_SQL}</prop> -->
          <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.hbm2ddl.auto">${HIBERNATE.hBM2DDL.AUTO}</prop>   
       </props>
    </property>