Spring 数据源的配置
在默认通过myeclipse生成的配置里，spring使用的是apache的dbcp连接池
<bean id="dataSource"
value="root"></property>
<property name="password" value="root"></property>
</bean>
如果改为C3P0则为：
<bean id="propertyConfigurer"
value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="autoCommitOnClose" value="true"/>
<property name="checkoutTimeout" value="${cpool.checkoutTimeout}"/>
<property name="initialPoolSize" value="${cpool.minPoolSize}"/>
<property name="minPoolSize" value="${cpool.minPoolSize}"/>
<property name="maxPoolSize" value="${cpool.maxPoolSize}"/>
<property name="maxIdleTime" value="${cpool.maxIdleTime}"/>
<property name="acquireIncrement" value="${cpool.acquireIncrement}"/>
<property name="maxIdleTimeExcessConnections" value="${cpool.maxIdleTimeExcessConnections}"/>
</bean>
jdbc.properties：
# Database URL
jdbc.url=jdbc:mysql://192.168.0.25"3306/db
# Database login information
jdbc.username=root
jdbc.password=
# Time to wait for an open connection before timing out
# (in milliseconds)
cpool.checkoutTimeout=5000
# Connection pool size
cpool.minPoolSize=5
cpool.maxPoolSize=40
# How long to keep unused connections around(in seconds)
# Note: MySQL times out idle connections after 8 hours(28,800 seconds)
# so ensure this value is below MySQL idle timeout
cpool.maxIdleTime=25200
# How long to hang on to excess unused connections after traffic spike
# (in seconds)
cpool.maxIdleTimeExcessConnections=1800
# Acquiring new connections is slow, so eagerly retrieve extra connections
# when current pool size is reached
cpool.acquireIncrement=5
或者将上面的3部分写成一个：
<bean id="c3p0DataSource" destroy-method="close">
<property name="driverClass">
<value>${jdbc.driverClassName}</value>
</property>
<property name="jdbcUrl">
<value>${jdbc.url}</value>
</property>
<property name="user">
<value>${jdbc.username}</value>
</property>
<property name="password">
<value>${jdbc.password}</value>
</property>
<property name="initialPoolSize"><value>10</value></property>
<property name="minPoolSize"><value>5</value></property>
<property name="maxPoolSize"><value>30</value></property>
<property name="acquireIncrement"><value>5</value></property>
<property name="maxIdleTime"><value>10</value></property>
<property name="maxStatements"><value>0</value></property>
</bean>
?
如果使用的是受管理的J2EE服务器，则在spring中配置为JNDI连接：
<bean id="dataSource" auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/testDB">\\数据源的名称
<parameter><name>username</name><value>root</value></parameter>数据库的名称
<parameter><name>password</name><value>password</value></parameter>数据库密码
<parameter><name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value></parameter>\\要加载的驱动
<parameter><name>url</name>
<value>jdbc:mysql://172.20.0.73/rk?</value></parameter>\\要连接的URL
</ResourceParams>
