利用c3p0配置数据库连接

 

<!-- 配置数据源 -->
<bean id="propertyConfigurer"
   class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
   <property name="location" value="/WEB-INF/database-config.properties" />
</bean>

<bean  id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
  
   <property name="driverClass" value="${love.driver}"></property>
   <property name="jdbcUrl" value="${love.url}"></property>
   <property name="user" value="${love.username}"></property>
   <property name="password" value="${love.password}"></property>
  
   <!-- 详细参数说明参见database-config.properties -->
   <property name="initialPoolSize" value="${love.initialPoolSize}"></property>
   <property name="minPoolSize" value="${love.minPoolSize}"></property>
   <property name="maxPoolSize" value="${love.maxPoolSize}"></property>
   <property name="maxIdleTime" value="${love.maxIdleTime}"></property>
   <property name="acquireIncrement" value="${love.acquireIncrement}"></property>
   <property name="idleConnectionTestPeriod" value="${love.idleConnectionTestPeriod}"></property>
   <property name="acquireRetryAttempts" value="${love.acquireRetryAttempts}"></property>
   <property name="breakAfterAcquireFailure" value="${love.breakAfterAcquireFailure}"></property>
   <property name="maxStatements" value="${love.maxStatements}"></property>
   <property name="testConnectionOnCheckout" value="${love.testConnectionOnCheckout}"></property>
</bean>

 

database-config.properties 配置：(mysql数据库, 部份内容摘自互联网)

##基础配置:
love.driver=org.gjt.mm.mysql.Driver
love.url=jdbc:mysql://127.0.0.1:3306/love?autoReconnect=true&amp;characterEncoding=utf-8
love.username=root

love.password=123456

##初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3
love.initialPoolSize=10

##连接池中保留的最小连接数
love.minPoolSize=5
   
##连接池中保留的最大连接数,Default: 15
love.maxPoolSize=30

##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
love.maxIdleTime=60

##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
love.acquireIncrement=5

##每60秒检查所有连接池中的空闲连接。Default: 0
love.idleConnectionTestPeriod=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 
love.acquireRetryAttempts=20

##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
love.breakAfterAcquireFailure=true

##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
love.maxStatements=0

##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
love.testConnectionOnCheckout=false

 

 

一.连接mysql数据库

< bean id ="dataSource"  class ="com.mchange.v2.c3p0.ComboPooledDataSource"  destroy-method ="close" abstract ="false" singleton ="true"  lazy-init ="default" autowire ="default" dependency-check ="default" >

< property name ="driverClass" > < value > com.mysql.jdbc.Driver </ value > </ property >

< property name ="jdbcUrl" > < value > jdbc:mysql://192.168.0.1/databasename?useUnicode=true &amp; characterEncoding=utf-8 &amp; autoReconnect=true </ value > </ property >

< property name ="user" > < value > username </ value > </ property >

< property name ="password" > < value > password </ value > </ property >

< property name ="minPoolSize" > < value > 10 </ value > </ property >

< property name ="maxPoolSize" > < value > 20 </ value > </ property >

< property name ="initialPoolSize" > < value > 10 </ value > </ property > </ bean >

< bean id ="sessionFactory"  class ="org.springframework.orm.hibernate3.LocalSessionFactoryBean" >

< property name ="dataSource" > < ref bean ="dataSource" ></ ref > </ property >

< property name ="hibernateProperties" > < props >

< prop key ="hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ prop >

< prop key ="hibernate.show_sql" >  false </ prop >

< prop key =" hibernate.generate_statistics " > true </ prop >

< prop key ="hibernate.cache.use_query_cache" >  true </ prop >

< prop key ="hibernate.cache.use_second_level_cache" > true </ prop >

< prop key ="hibernate.cache.provider_class" > net.sf.ehcache.hibernate.EhCacheProvider </ prop >

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

</ prop >

< prop key ="hibernate.query.substitutions" >  true 1, false 0, yes 'Y', no 'N' </ prop >

< prop  key ="hibernate.bytecode.use_reflection_optimizer" > true </ prop >

< prop key ="hibernate.use_outer_join" > true </ prop >

< prop key ="hibernate.prepare_sql" > true </ prop >

< prop key ="hibernate.query.factory_class" > org.hibernate.hql.ast.ASTQueryTranslatorFactory </ prop >

</ props >

</ property >

< property name ="mappingResources" >

< list >

< value > xxx/xx/xx.hbm.xml </ value >

< value > xxx/xx/xx.hbm.xml </ value >

</ list >

</ property >

</ bean >

二.连接Oracle数据库

< property name ="driverClass" > < value > oracle.jdbc.driver.OracleDriver </ value > </ property >

< property name ="jdbcUrl" > < value > jdbc:oracle:thin:@192.168.0.1:1521:orcl </ value > </ property >

< prop key ="hibernate.dialect" > org.hibernate.dialect.OracleDialect </ prop >

利用c3p0配置数据库连接