android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed - zx19899891的專欄

在android進行單元測試時，測試了自己編寫的添加數據到資料庫的函數，其測試函數如下：public void testAdd() { StudentDAO studentDAO = new StudentDAO(this.getContext()); Student student = new Student(1, lily, 20); studentDAO.add

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