There was an unexpected error (type=Internal Server Error, status=500)
时间：2020-01-15 17:44:36
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Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Wed Jan 15 17:18:28 CST 2020 There was an unexpected error (type=Internal Server Error, status=500). 500 null
报错500，错误可能为 后台 sql 语句书写错误
获取不到 db_source 的值，改为固定的值
原文：https://www.cnblogs.com/shiliuhuanya/p/12197865.html
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