java.sql.SQLIntegrityConstraintViolationException: Column 'category' cannot be null:(category沒有值)
1.首先查看控制層是否可以拿到客戶端提交的數據
2.沒有拿到數據就要檢測表單提交時，參數名是定義的
但是我檢查了全部都沒有問題
最后看到了名字錯誤了,name的值應該個pojo對象的值一樣
異常:java.sql.SQLIntegrityConstraintViolationException: Column 'category' cannot be null
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