How do i insert an entity that is derived fr开发者_如何学Com another entity. here is my code but it\'s not working:(applicationreplacement derived from application
目录必要准备SQL语句编写加执行编写执行创建执行器ExecuteNonQuery()方式执行二者区别 ExecuteReader()方式执行实例：1-创建一张数据表2-向表中插入数据3-修改表中数据 4-删除表中数据5-读取表中数据
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