I have a controller that accepts a list of object then insert it to database I already done it but I think my code will have a problem if there will be a large of data.
My code
public void SaveAnswers(List<questionModel.SAVEDANSWER> answers, int userid)
{
string query = "INSERT INTO answer (QUESTIONID,USERANSWERID, USERID) VALUES (@qid, @aid,@uid);";
using (MySqlConnection myconn = new MySqlConnection(cmn.connstring))
{
myconn.Open();
for (int i = 0; i <= answers.Count - 1; i++)
using (MySqlCommand myCmd = new MySqlCommand(query, myconn))
{
myCmd.CommandType = System.Data.CommandType.Text;
MySqlParameter questionid = myCmd.Parameters.AddWithValue("@qid", answers[i].QUESTIONID);
myCmd.Parameters.AddWithValue("@qid", answers[i].QUESTIONID);
myCmd.Parameters.AddWithValue("@aid", answers[i].ANSWERID);
myCmd.Parameters.AddWithValue("@uid", userid);
myCmd.ExecuteNonQuery();
}
myconn.Close();
myconn.Dispose();
}
}
I did something similar in my SQL Server. I inserted the list of object to data table then pass the data table to the stored procedure.
In my stored procedure in SQL Server, I have a table parameter.
Can I do something like that in MySQL?
you can use multiple insert rows approach with List builder(assume all are integers)
public void SaveAnswers(List<questionModel.SAVEDANSWER> answers, int userid)
{
StringBuilder query = new StringBuilder("INSERT INTO answer (QUESTIONID,USERANSWERID, USERID) VALUES";
using (MySqlConnection myconn = new MySqlConnection(cmn.connstring))
{
List<String> Rows = new List<String>();
for (int i = 0; i <= answers.Count - 1; i++)
{
Rows.Add(string.Format("({0},{1},{2})", (answers[i].QUESTIONID), (answers[i].ANSWERID),(answers[i].userId)));
}
query.Append(string.Join(",", Rows));
query.Append(";");
myconn.Open();
using (MySqlCommand myCmd = new MySqlCommand(query.ToString(), myconn))
{
myCmd.CommandType = CommandType.Text;
myCmd.ExecuteNonQuery();
}
myconn.Close();
}
}
If you are using C#6, you can try string interpolation to your query inside of a foreach statement.
public void SaveAnswers(List<questionModel.SAVEDANSWER> answers, int userid)
{
using (MySqlConnection myconn = new MySqlConnection(cmn.connstring))
{
myconn.Open();
foreach(var item in answers)
{
//do string interpolation of your query.
var myCmd = new MySqlCommand($@"INSERT INTO answer (QUESTIONID,USERANSWERID, USERID) VALUES ({item.QUESTIONID}, {item.ANSWERID},{userid})", myconn))
myCmd.CommandType = System.Data.CommandType.Text;
myCmd.ExecuteNonQuery();
}
}
}
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