[英]Query on Mysql database with asp.net core
我需要查询数据库。 该查询工作正常,但是我需要循环读取表中的所有数据。 我不知道如何在此查询中添加“做”或“在”时
[HttpPost]
public IActionResult SendMessage(string send_to, string message, string phone)
{
var email = HttpContext.Session.GetString("email");
MySqlDataReader reader;
try
{
cmdMySQL.Connection = conMySQL;
conMySQL.Open();
cmdMySQL.CommandText = "SELECT * FROM tbl_mensagens WHERE enviado = '" + 0 + "' AND email_usuario = '" + email + "' ";
reader = cmdMySQL.ExecuteReader();
while (reader.Read())
{
var codmsgx ="";
phone = "";
message = "";
codmsgx = reader[0].ToString();
phone = reader[4].ToString();
message = reader[5].ToString();
EnviarMensagem(send_to, message, phone, email, codmsgx);
AtualizarBd(send_to, message, phone, email, codmsgx);
}
reader.Close();
return View();
}
catch (Exception ex) { Debug.WriteLine(ex); return View(); }
finally
{
conMySQL.Close();
}
}
您只得到一行,因为您正在调用reader.Read()
。 每次调用Read()时,阅读器都会前进到下一行并返回true;否则,返回true。 或者,当阅读器前进到最后一行时,它返回false。
假设您有一个视图模型:
public class MensagensViewModel
{
public string Codmsgx { get; set; }
public string Phone { get; set; }
public string Message { get; set; }
}
要从tbl_mensagens
表中获取List<MensagensViewModel>
数据,您需要手动将访问的数据保存到mensagens
中,如下代码所示:
try
{
cmdMySQL.Connection = conMySQL;
cmdMySQL.CommandText = "SELECT * FROM tbl_mensagens WHERE enviado = '" + 0 + "' AND email_usuario = '" + email + "' ";
conMySQL.Open();
reader = cmdMySQL.ExecuteReader();
List<MensagensViewModel> mensagens = new List<MensagensViewModel>();//To save all retrieved data
while (reader.Read())
{
var mensagen = new MensagensViewModel()
{
Codmsgx = reader[0].ToString(),
Phone = reader[4].ToString(),
Message = reader[5].ToString()
};
mensagens.Add(mensagen);
//other logic
}
reader.Close();
return View();
}
catch (Exception ex) { Debug.WriteLine(ex); return View(); }
finally
{
conMySQL.Close();
}
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