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doDispatch方法
有参构造与无参构造的bean配置差别
有无参构造
<bean id="db" class="com.mchange.v2.c3p0.ComboPooledDataSource"
p:jdbcUrl="${url}"
p:driverClass="${driver}"
p:user="${user}"
p:password="${password}"
>
</bean>
无无参构造
<bean id="temp" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="fac"></constructor-arg>
</bean>