<
hibernate-configuration
>
<
session-factory
>
<
property
name
=
"dialect"
>org.hibernate.dialect.MySQLDialect</
property
>
<
property
name
=
"connection.driver_class"
>com.mysql.jdbc.Driver</
property
>
<
property
name
=
"connection.url"
>jdbc:mysql:///hibernate</
property
>
<
property
name
=
"connection.username"
>root</
property
>
<
property
name
=
"connection.password"
>123456</
property
>
<
property
name
=
"hbm2ddl.auto"
>update</
property
>
<
property
name
=
"show_sql"
>true</
property
>
<!--C3P0配置 -->
<
property
name
=
"hibernate.connection.provider_class"
>org.hibernate.connection.C3P0ConnectionProvider</
property
>
<
property
name
=
"hibernate.c3p0.max_size"
>20</
property
>
<
property
name
=
"hibernate.c3p0.min_size"
>10</
property
>
<
property
name
=
"hibernate.c3p0.timeout"
>120</
property
>
<
property
name
=
"automaticTestTable"
>Test</
property
>
<
property
name
=
"hibernate.c3p0.max_statements"
>100</
property
>
<
property
name
=
"hibernate.c3p0.idle_test_period"
>120</
property
>
<
property
name
=
"hibernate.c3p0.acquire_increment"
>1</
property
>
<
property
name
=
"c3p0.testConnectionOnCheckout"
>true</
property
>
<
property
name
=
"c3p0.idleConnectionTestPeriod"
>18000</
property
>
<
property
name
=
"c3p0.maxIdleTime"
>25000</
property
>
<
property
name
=
"c3p0.idle_test_period"
>120</
property
>
<
mapping
resource
=
"com/domain/user.hbm.xml"
/>
<
mapping
resource
=
"com/domain/user2.hbm.xml"
/>
</
session-factory
>
</
hibernate-configuration
>
C3P0配置属性的说明如下:
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|
<!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 --> < property name = "acquireIncrement" >3</ property >
<!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 --> < property name = "acquireRetryAttempts" >30</ property >
<!--两次连接中间隔时间,单位毫秒。Default: 1000 --> < property name = "acquireRetryDelay" >1000</ property >
<!--连接关闭时默认将所有未提交的操作回滚。Default: false --> < property name = "autoCommitOnClose" >false</ property >
<!--c3p0将建一张名为Test的空表,并使用其自带的查询语句进行测试。如果定义了这个参数那么 属性preferredTestQuery将被忽略。你不能在这张Test表上进行任何操作,它将只供c3p0测试 使用。Default: null--> < property name = "automaticTestTable" >Test</ property >
<!--获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效 保留,并在下次调用getConnection()的时候继续尝试获取连接。如果设为true,那么在尝试 获取连接失败后该数据源将申明已断开并永久关闭。Default: false--> < property name = "breakAfterAcquireFailure" >false</ property >
<!--当连接池用完时客户端调用getConnection()后等待获取新连接的时间,超时后将抛出 SQLException,如设为0则无限期等待。单位毫秒。Default: 0 --> < property name = "checkoutTimeout" >100</ property >
<!--通过实现ConnectionTester或QueryConnectionTester的类来测试连接。类名需制定全路径。 Default: com.mchange.v2.c3p0.impl.DefaultConnectionTester--> < property name = "connectionTesterClassName" ></ property >
<!--指定c3p0 libraries的路径,如果(通常都是这样)在本地即可获得那么无需设置,默认null即可 Default: null--> < property name = "factoryClassLocation" >null</ property >
<!--Strongly disrecommended. Setting this to true may lead to subtle and bizarre bugs. (文档原文)作者强烈建议不使用的一个属性--> < property name = "forceIgnoreUnresolvedTransactions" >false</ property >
<!--每60秒检查所有连接池中的空闲连接。Default: 0 --> < property name = "idleConnectionTestPeriod" >60</ property >
<!--初始化时获取三个连接,取值应在minPoolSize与maxPoolSize之间。Default: 3 --> < property name = "initialPoolSize" >3</ property >
<!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 --> < property name = "maxIdleTime" >60</ property >
<!--连接池中保留的最大连接数。Default: 15 --> < property name = "maxPoolSize" >15</ property >
<!--JDBC的标准参数,用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements 属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。 如果maxStatements与maxStatementsPerConnection均为0,则缓存被关闭。Default: 0--> < property name = "maxStatements" >100</ property >
<!--maxStatementsPerConnection定义了连接池内单个连接所拥有的最大缓存statements数。Default: 0 --> < property name = "maxStatementsPerConnection" ></ property >
<!--c3p0是异步操作的,缓慢的JDBC操作通过帮助进程完成。扩展这些操作可以有效的提升性能 通过多线程实现多个操作同时被执行。Default: 3--> < property name = "numHelperThreads" >3</ property >
<!--当用户调用getConnection()时使root用户成为去获取连接的用户。主要用于连接池连接非c3p0 的数据源时。Default: null--> < property name = "overrideDefaultUser" >root</ property >
<!--与overrideDefaultUser参数对应使用的一个参数。Default: null--> < property name = "overrideDefaultPassword" >password</ property >
<!--密码。Default: null--> < property name = "password" ></ property >
<!--定义所有连接测试都执行的测试语句。在使用连接测试的情况下这个一显著提高测试速度。注意: 测试的表必须在初始数据源的时候就存在。Default: null--> < property name = "preferredTestQuery" >select id from test where id=1</ property >
<!--用户修改系统配置参数执行前最多等待300秒。Default: 300 --> < property name = "propertyCycle" >300</ property >
<!--因性能消耗大请只在需要的时候使用它。如果设为true那么在每个connection提交的 时候都将校验其有效性。建议使用idleConnectionTestPeriod或automaticTestTable 等方法来提升连接测试的性能。Default: false --> < property name = "testConnectionOnCheckout" >false</ property >
<!--如果设为true那么在取得连接的同时将校验连接的有效性。Default: false --> < property name = "testConnectionOnCheckin" >true</ property >
<!--用户名。Default: null--> < property name = "user" >root</ property >
在Hibernate(spring管理)中的配置: < bean id = "dataSource" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method = "close" >
< property name = "driverClass" >< value >oracle.jdbc.driver.OracleDriver</ value ></ property >
< property name = "jdbcUrl" >< value >jdbc:oracle:thin:@localhost:1521:Test</ value ></ property >
< property name = "user" >< value >Kay</ value ></ property >
< property name = "password" >< value >root</ value ></ property >
<!--连接池中保留的最小连接数。--> < property name = "minPoolSize" value = "10" />
<!--连接池中保留的最大连接数。Default: 15 --> < property name = "maxPoolSize" value = "100" />
<!--最大空闲时间,1800秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 --> < property name = "maxIdleTime" value = "1800" />
<!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 --> < property name = "acquireIncrement" value = "3" />
< property name = "maxStatements" value = "1000" />
< property name = "initialPoolSize" value = "10" />
<!--每60秒检查所有连接池中的空闲连接。Default: 0 --> < property name = "idleConnectionTestPeriod" value = "60" />
<!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 --> < property name = "acquireRetryAttempts" value = "30" />
< property name = "breakAfterAcquireFailure" value = "true" />
< property name = "testConnectionOnCheckout" value = "false" />
</ bean >
|