public TResult Sum <TResult>(Expression <Func <T, TResult> > sumExpression)
{
SqlProvider.FormatSum(sumExpression);
SetSql();
return(DbCon.ExecuteScalar <TResult>(SqlProvider.SqlString, SqlProvider.Params));
}
public bool Exists()
{
SqlProvider.FormatExists();
SetSql();
return(DbCon.ExecuteScalar <int>(SqlProvider.SqlString, SqlProvider.Params) == 1);
}
public int Count()
{
SqlProvider.FormatCount();
SetSql();
return(DbCon.ExecuteScalar <int>(SqlProvider.SqlString, SqlProvider.Params));
}