I am making webservice in asp.net with c# and MYSQL.
I want to update one table based on two condition. But there is no any common fields between them.
Is it possible ?
**EDITED** -
I have used code as -
using (MySqlConnection con1 = new MySqlConnection(conString))
{
string update = "UPDATE tbl_UserInfo U SET Chips= @param1 where UserName = @param2 AND QuestionID = @param3";
using (MySqlCommand cmd1 = new MySqlCommand(update, con1))
{
cmd1.Parameters.AddWithValue("@param1", getChips(answerby));
cmd1.Parameters.AddWithValue("@param2", answerby);
cmd1.Parameters.AddWithValue("@param3", queid);
con1.Open();
success = cmd1.ExecuteNonQuery();
con1.Close();
if (success > 0)
{
return success;
}
else
return 0;
}
}
But it gives an error
Unknown column QuestionID in where clause
What can be the problem ?
Waiting for solution ...
You have to use SqlCommand class and provide parameters, and pass the input to one of them:
using(SqlConnection conn = new SqlConnection("connString"))
{
string incrementChips = "UPDATE tbl_UserInfo U SET Chips= @param1 where UserName = @param2 AND QuestionID = @param3";
// no need to use U.Chips or U.UserName, since you do not update in 2 or more table (where can be same fields)
using(SqlCommand cmd = new SqlCommand(incrementChips, conn))
{
//input parameter:
cmd.Parameters.Add("@param1", SqlDbType.VarChar, 50).Value = "your input string";
//and condition parameters:
cmd.Parameters.Add("@param2", SqlDbType.VarChar, 50).Value = "answerby";
cmd.Parameters.Add("@param3", SqlDbType.VarChar, 50).Value = "queid";
try
{
conn.Open();
cmd.ExecuteNonQuery();
}
catch(Exception ex)
{
//show exception to user (if it happens)
}
}
}
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