配置连接池druid

<properties>
    <druid.version>1.0.9</druid.version>
</properties>

<dependencyManagement>
    <dependencies>
        <!-- 连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>