IDEA连接Mysql失败，但是navicat等工具都可以启动成功

IDEA连接Mysql失败，但是navicat等工具都可以启动成功 错误代码：[08001] Could not create connection to database server. Attempted reconnect 3 times. Giving up. com.mysql.cj.exceptions.CJException: Unknown database ‘llb’. 我当时试

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