Question

在asp.net中,下面这条语句所取出的值怎么赋给一个字符串变量啊

OleDbCommand cmd = new OleDbCommand("SELECT TOP 1 vipsign FROM vip ORDER BY 1 DESC", con);

Answer 1

OleDbCommand cmd = new OleDbCommand("SELECT TOP 1 vipsign FROM vip ORDER BY 1 DESC", con);
// 打开数据库连接
con.Open();
// 调用cmd的ExecuteReader()方法返回一个阅读器
OleDbDataReader reader = cmd.ExecuteReader();
// 如果读到了内容,即不为空
while (reader.Read())
{
int i = 0;
// 取值
string colValue = reader.GetValue(i).ToString();
// 取列名
string colName = reader.GetName(i).ToString();
i++;
}
// 关闭连接
con.Close();