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引入数据库后报这个错，不知道是什么原因

来源：6-1 关于红包收发之操作数据库(上)

Leoakin

2020-07-14 21:42

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

Action:

Consider the following:

If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.

If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

Disconnected from the target VM, address: '127.0.0.1:55235', transport: 'socket'

Process finished with exit code 1

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