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mysql-Mysql中com.ExecuteScalar(); 为什么先转为long再int？？

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Release： 2016-06-06 09:35:58
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mysqlsqlc#

Mysql中int sum=(int)(long)com.ExecuteScalar(); 为什么好先转为long再int？？

MySqlCommand com=new MySqlCommand("SELECT COUNT(*) from student",conn);
int sum=(int)(long)com.ExecuteScalar();

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