spring 连接数据源四种方式

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 <!--spring 内置jdbc--> <!--<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">     <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>     <property name="url" value="jdbc:mysql://localhost:3306/book?characterEncoding=utf-8"></property>     <property name="username" value="root"></property>     <property name="password" value=""></property> </bean>--> <!--basuc数据源--><!-- <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">     <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>     <property name="url" value="jdbc:mysql://localhost:3306/book?characterEncoding=utf-8"></property>     <property name="username" value="root"></property>     <property name="password" value=""></property> </bean>--> <!--c3p0数据源--> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">     <property name="driverClass" value="com.mysql.jdbc.Driver"></property>     <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/book?characterEncoding=utf-8"></property>     <property name="user" value="root"></property>     <property name="password" value=""></property> </bean>

<!--阿里巴巴--><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>    <property name="url" value="jdbc:mysql://localhost:3306/book?characterEncoding=utf-8"></property>    <property name="username" value="root"></property>    <property name="password" value=""></property></bean>

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