There was an unexpected error (type=Internal Server Error, status=500)

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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