[.net中]数据操作应该注意的问题
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1.使用从一个table中取数据时,要确保,要使用该行数据存在
2.使用强制类型转换时要确保数据不为空.
3.在拼sql语句时要注意防止因为参数为空出现:
select * from member where UserID = and xx = 1
4.要注意防止sql注入引起得问题.
5.判断一个一个字段是否为空用System.DBNull.Value.
6.尽可能的使用存储过程.可以解决问题3,
7.在插入一条记录时,检查,记录是否存在,如果不存在插入,存在则更新.