How can I recycle my SqliteCommand to speed up this Sqlite bulk insert (iOS)?

Question

I\'m using the code below to bulk insert a 30000 rows (1000 rows at a time). Still it is not as fast as it could be. In this example Improve INSERT-per-second performance of

Answer 1

You can also try to use a stored procedure for inserting rows. It should be faster than inline statements especially for inserting so many rows.

Answer 2

Try to change your code to the following:

using ( var oConn = new SqliteConnection ( "Data Source=" + DB_NAME ) )
{
    oConn.Open (  );

    // Wrap the whole bulk insertion into one block to make it faster, otherwise one transaction per INSERT would be created.
    // Note that this is differen from "BEGIN TRANSACTION" which would increase memory usage a lot!
    SqliteCommand oCmd = new SqliteCommand ( "BEGIN", oConn );
    oCmd.ExecuteNonQuery (  );
    oCmd.Dispose (  );

    oCmd = new SqliteCommand ( "INSERT INTO LocalObjects ( intID, intParentID, intObjectType, strName, dtModified VALUES (@intID, @intParentID, @intObjectType, @strName, @dtModified)", oConn );

    // <do this for all of your parameters>.
    var id = oCmd.CreateParameter();
    id.ParameterName = "@intID";
    oCmd.Parameters.Add(id);
    // </do this for all of your parameters>.

    foreach ( MyObj oObj in aMyObjects )
    {
        // <do this for all of your parameters>.
        id.Value = oMyObj.ID;
        // </do this for all of your parameters>.

        oCmd.ExecuteNonQuery (  );
    }

    oCmd.Dispose();

    oCmd = new SqliteCommand ( "END", oConn );
    oCmd.ExecuteNonQuery (  );
    oCmd.Dispose (  );

    oConn.Close (  );
    oConn.Dispose (  );
}

Basically, in each loop now you just change the values of the parameters, instead of constructing a whole new query. However, I am not sure, whether your performance will really benefit from it. You need to try that.