At least one JPA metamodel must be present!
使用spring jpa是一直報這個錯，找了兩天網上沒有找到答案，最后發現時配置配錯了，如下： ...
原文：At least one object must implement IComparable
中文：必須至少有一個對象實現 IComparable。 序列排序時報這個錯誤 在LINQ to SQL Entity中可以這么用，LINQ Object 不能這么用，因為new r.DepartmentName, r.ReportNo 這個匿名對象沒有實現IComparable接口，也無法實現這個接口 其實多字段排序用 ThenBy ThenByDescending 就可以： lstReports ...
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