public async Task <TResult> SumAsync <TResult>(Expression <Func <T, TResult> > sumExpression)
{
SqlProvider.FormatSum(sumExpression);
SetSql();
return(await DbCon.ExecuteScalarAsync <TResult>(SqlProvider.SqlString, SqlProvider.Params));
}
public async Task <bool> ExistsAsync()
{
SqlProvider.FormatExists();
SetSql();
return(await DbCon.ExecuteScalarAsync <int>(SqlProvider.SqlString, SqlProvider.Params) == 1);
}
public async Task <int> CountAsync()
{
SqlProvider.FormatCount();
SetSql();
return(await DbCon.ExecuteScalarAsync <int>(SqlProvider.SqlString, SqlProvider.Params));
}