c# - 如何修复 MSSQL 上的 "Invalid Column Name"SQL 异常

Question

我试图在运行时在代码中传递要检查的列名和值。但是我得到了一个:

"Invalid Column Name "

异常。代码如下:

cmd = new SqlCommand();
con.Open();
cmd.Connection = con;
cmd.CommandText = "INSERT INTO rezervasyon (Ad,Soyad,TelefonNo,OdaSayisi,KişiSayisi," +
                          "Ucret,Acıklama,GirisTarihi,CikisTarihi,KayitTarihi) VALUES " +
                          "(" + isim + ",'" + soyisim + "','" + telefon + "'," +
                          "'" + oda_sayisi + "','" + kisi_sayisi + "','" + ucret + "'," +
                          "'" + aciklama + "','" + giris_tar + "','" + cikis_tar + "'," +
                          "'" + current_tarih + "')";
cmd.ExecuteNonQuery(); 
con.Close();

Answer 1

你在这里遗漏了一个单引号 "+ isim + "，它应该是 '"+ isim + "'。但是，您应该始终使用 parameterized queries避免 SQL Injection并消除此类错误。

cmd.CommandText = "INSERT INTO rezervasyon (Ad,Soyad,TelefonNo,OdaSayisi,KişiSayisi,Ucret" +
                  ",Acıklama,GirisTarihi,CikisTarihi,KayitTarihi) " +
                  "VALUES (@isim, @soyisim , ...)";
cmd.Parameters.AddWithValue("@isim", isim);
cmd.Parameters.AddWithValue("@soyisim", soyisim);
//Other parameters

虽然直接指定类型并使用Value属性比AddWithValue更好:

cmd.Parameters.Add("@isim", SqlDbType.VarChar).Value = isim;

Can we stop using AddWithValue() already?