Passing parameters to IdbCommand for mySQL database - mysql

Question

I am trying to do something relatively simple using IdbCommand to execute an insert query.
Here's the code:
using (IDbConnection conn = DbHelper.GetConnection(DbConnString))
using (IDbCommand com = conn.CreateCommand())
{
com.CommandType = CommandType.Text;
com.CommandText =
String.Format(
"INSERT INTO {0} (`Date`, User, Type, `Comment`) VALUES (#Date, #User, #Type, #Comment);",
TableName);
conn.Open();
var parameterDate = com.CreateParameter();
parameterDate.ParameterName = "#Date";
parameterDate.Value = entry.Date;
parameterDate.DbType = DbType.DateTime;
com.Parameters.Add(parameterDate);
var parameterUser = com.CreateParameter();
parameterUser.ParameterName = "#User";
parameterUser.Value = entry.User;
parameterUser.DbType = DbType.String;
com.Parameters.Add(parameterUser);
var parameterLogType = com.CreateParameter();
parameterLogType.ParameterName = "#Type";
parameterLogType.Value = entry.Type;
parameterLogType.DbType = DbType.Int32;
com.Parameters.Add(parameterLogType);
var parameterComment = com.CreateParameter();
parameterComment.ParameterName = "#Comment";
parameterComment.Value = entry.Comment;
parameterComment.DbType = DbType.String;
com.Parameters.Add(parameterComment);
com.ExecuteNonQuery();
But I keep getting a MySqlException with the message "Column 'Date' cannot be null".
All my selects work fine, it's just this insert that has a problem and I can't see an obvious problem with it.
The parameter is populated with a valid DateTime during runtime.
I thought it might be related to the fact that Date is a reserved word and needs backquotes, but that's what online tutorials recommend.
Any ideas?

Answer 1

Found it!
For some reason instead of #, it needs ?
So the working code is:
using (IDbConnection conn = DbHelper.GetConnection(DbConnString))
using (IDbCommand com = conn.CreateCommand())
{
com.CommandType = CommandType.Text;
com.CommandText =
String.Format(
"INSERT INTO {0} (`Date`, User, Type, `Comment`) VALUES (?Date, ?User, ?Type, ?Comment);",
TableName);
conn.Open();
var parameterDate = com.CreateParameter();
parameterDate.ParameterName = "?Date";
parameterDate.Value = entry.Date;
parameterDate.DbType = DbType.DateTime;
com.Parameters.Add(parameterDate);
var parameterUser = com.CreateParameter();
parameterUser.ParameterName = "?User";
parameterUser.Value = entry.User;
parameterUser.DbType = DbType.String;
com.Parameters.Add(parameterUser);
var parameterLogType = com.CreateParameter();
parameterLogType.ParameterName = "?Type";
parameterLogType.Value = entry.Type;
parameterLogType.DbType = DbType.Int32;
com.Parameters.Add(parameterLogType);
var parameterComment = com.CreateParameter();
parameterComment.ParameterName = "?Comment";
parameterComment.Value = entry.Comment;
parameterComment.DbType = DbType.String;
com.Parameters.Add(parameterComment);
com.ExecuteNonQuery();
}