/// <summary>
/// 更新 来访卡 状态
/// </summary>
/// <param name="card_no"></param>
/// <param name="flag"></param>
/// <returns></returns>
public static int updateFlag(string card_no, int flag)
{
//1.查询出数据。
//2. 符合条件则更新数据
int returnValue = 0;
guest_card model = GetModel(card_no);
if (model == null)
{
return(-1);
}
//并没有建立数据库连接
MySqlConnection conn = new MySqlConnection(connectStr);
try
{
conn.Open(); //建立连接，打开数据库
card_no = card_no.Replace("'", "‘"); //防一下sql注入
string sqlstr = "update guest_card set card_flag ='" + flag + "' where card_no = '" + card_no + "' "; //SQL语句
MySqlCommand cmd = new MySqlCommand(sqlstr, conn);
returnValue = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
conn.Close(); //关闭连接
}
return(returnValue);
}
//获取 来访卡 信息
public static guest_card GetModel(string card_no)
{
guest_card model;
//并没有建立数据库连接
MySqlConnection conn = new MySqlConnection(connectStr);
try
{
conn.Open(); //建立连接，打开数据库
card_no = card_no.Replace("'", "‘"); //防一下sql注入
string sqlstr = "select * from guest_card where card_no = '" + card_no + "' "; //SQL语句
MySqlCommand cmd = new MySqlCommand(sqlstr, conn);
//相当于数据读出流 理解为一本书
MySqlDataReader reader = cmd.ExecuteReader();
if (reader.Read()) //遍历表中数据,只取第一条记录
{
//Console.WriteLine(reader.GetInt32("id") + reader.GetString("name") + reader.GetString("age"));
//封装属性
model = new guest_card
{
//封装属性
card_id = reader.GetInt32("card_id"),
card_no = reader.GetString("card_no"),
card_flag = reader.GetInt32("card_flag")
};
}
else
{
model = null;
}
if (!reader.IsClosed)
{
reader.Close();
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
return(null);
}
finally
{
conn.Close(); //关闭连接
}
return(model);
}
