IDEA連接Mysql失敗，但是navicat等工具都可以啓動成功

IDEA連接Mysql失敗，但是navicat等工具都可以啓動成功 錯誤代碼：[08001] Could not create connection to database server. Attempted reconnect 3 times. Giving up. com.mysql.cj.exceptions.CJException: Unknown database ‘llb’. 我當時試

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