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我正在使用c3p0-0.9.1.2.jar和hibernate 3.2.1。以下是休眠配置。 

    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/oDB</property>
    <property name="hibernate.connection.username">oDBUser</property>
    <property name="hibernate.connection.zeroDateTimeBehavior">convertToNull</property>
    <property name="hibernate.connection.autoReconnect">true</property>

    <property name="c3p0.max_size">10</property>
    <property name="c3p0.min_size">4</property>
    <property name="c3p0.timeout">1800</property>
    <property name="c3p0.max_statements">200</property>
    <property name="c3p0.maxStatementsPerConnection">5</property>
    <property name="c3p0.idle_test_period">1500</property>
    <property name="c3p0.acquire_increment">2</property>
    <property name="c3p0.testConnectionOnCheckout">true</property>
    <property name="c3p0.preferredTestQuery">SELECT 1</property>

但我认为 maxStatementsPerConnection、testConnectionOnCheckout 和 preferredTestQuery 等参数在运行时没有任何影响。我应该为这些参数做些什么吗？这是我在日志中得到的。

信息 2010-11-06 19:04:37,364 初始化 c3p0 池... com.mchange.v2.c3p0.PoolBackedDataSource@e2da87d1 [connectionPoolDataSource -> com.mchange.v2.c3p0.WrapperConnectionPoolDataSource@412cca1a [acquireIncrement -> 2，acquireRetryAttempts -> 30，acquireRetryDelay -> 1000，autoCommitOnClose -> false，automaticTestTable -> null，breakAfterAcquireFailure -> false，checkoutTimeout -> 0，connectionCustomizerClassName -> null，connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester，debugUnreturnedConnectionStackTraces -> false, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> z8kfsx8c99kx7g8xqvs4|87400, idleConnectionTestPeriod -> 1500, initialPoolSize -> 4, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime ->1800, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 10, maxStatements -> 200,maxStatementsPerConnection -> 0 , minPoolSize -> 4, nestedDataSource -> com.mchange.v2.c3p0.DriverManagerDataSource@9d074b3f [描述 -> null, driverClass -> null, factoryClassLocation -> null, identityToken -> z8kfsx8c99kx7g8xqvs4|b245dc, jdbcUrl -> jdbc:mysql://localhost:3306/oDB, 属性 -> {autoReconnect=true, user= *, 密码=* , zeroDateTimeBehavior=convertToNull} ], preferredTestQuery -> null , propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false , unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false; userOverrides: {} ]，dataSourceName -> null，factoryClassLocation -> null，identityToken -> z8kfsx8c99kx7g8xqvs4|93c5e7，numHelperThreads -> 3]

提前致谢。古拉

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1 回答 1

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但我认为 maxStatementsPerConnection、testConnectionOnCheckout 和 preferredTestQuery 等参数在运行时没有任何影响。我应该为这些参数做些什么吗？

它们不在 Hibernate 配置文件中，您需要提供一个c3p0.properties文件。请参阅 C3P0 文档中的附录 C：特定于 Hibernate 的说明。

于 2010-11-07T10:24:32.473 回答