org.springframework.jdbc.datasource.DriverManagerDataSource优于oracle.jdbc.pool.OracleDataSource的优势

Question

I currently use this configuration for my projects:

<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource"
    destroy-method="close">
        <property name="URL" ...
         <property name="user" ...
        <property name="password" ...
        <property name="connectionCachingEnabled" value="true" />

And it works fine, pretty fast. I happened to see, on an old project (spring 2.5) this configuration:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName">
        <value>oracle.jdbc.driver.OracleDriver</value>
    </property>
    <property name="url"...
    <property name="username" ...
    <property name="password" ...
</bean>

From documentation it would seem that this last option does not make use of a connection pool. I see no reason to use this configuration over mine, but it still exists so I am curious: where's the advantage/limitation?

Answer 1

1st configuration is oracle specific, whereas 2nd configuration is generic. You can explicitly define driver class. This is the only major difference I can see in them other than connection pool support of OracleDataSource.

You can use it for generic behavior as mentioned below:

<bean id="baseDataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
abstract="true">
<property name="username" value="user"/>
<property name="password" value="pwd" />
</bean>

<bean id="mySqlDataSource" parent="baseDataSource">
<property name="driverClassName" value="${mySQL.driver}" />
<property name="url" value="${mySQL.url}"/>
</bean>

<bean id="oracleDataSource" parent="baseDataSource">
<property name="driverClassName" value="${oracle.driver}" />
<property name="url" value="${oracle.url}"/>
</bean>

Property values you can externalized.

You can explore Apache Jakarta Commons DBCP which has all the features of DriverManagerDataSource along with connection pool feature.