Druid 缓存池

1.Druid 引用

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.2.16</version>
</dependency>

2.配置连接池

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3.创建连接池

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