How to delete data from mysql if more than 3 days?

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C#

string constr = @"Data Source=192.168.*.**; Database=wsditsupport; User ID=****; Password=*****";
            using (MySqlConnection con = new MySqlConnection(constr))
            {
                using (MySqlCommand cmd = new MySqlCommand("SELECT Date_Down FROM datalogin WHERE Date_Down < Date_Down(CURDATE(), INTERVAL 3 DAY"))
                {
                    using (MySqlDataAdapter sda = new MySqlDataAdapter())
                    {
                        cmd.Connection = con;
                        sda.SelectCommand = cmd;
                        if ((DateTime.Now - cmd).Days >= 3)
                        {
                            // Delete from database
                        }
                    }
                }

What I have tried:

This Code are my 1st try, but I need help?

I Need Help From you guys. if ((DateTime.Now - cmd).Days >= 3) <<< at this line I'm getting error Operator '-' cannot be applied to operands of type 'DateTime' and 'MySqlCommand'. So how to fix it?

Posted 19-Jun-16 17:31pm

Nigol_Learner

Updated 19-Jun-16 22:45pm

v2

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kedar001 · Answer 1 · 2016-06-19T17:59:00

Solution 1

try

SQL

select * from datalogin  as mytable where datediff(now(), mytable.date) > 3

Posted 19-Jun-16 17:59pm

kedar001

CHill60 · Answer 2 · 2016-06-19T22:45:00

Just get MySQL to do the deletion at the same time as identifying the records to delete

C#

string constr = @"Data Source=192.168.*.**; Database=wsditsupport; User ID=****; Password=*****";
using (MySqlConnection con = new MySqlConnection(constr))
{
     using (MySqlCommand cmd = new MySqlCommand("delete from datalogin where datediff(now(), datedown) > 3;",con)
     {
          cmd.ExecuteNonQuery();            
     }
     con.Close();
}