Question

i need select data, end i need change column date_payment with DateTime to Text, please help…

i write this query

SELECT r.id, user_name, user_phone, date_create, REPLACE( date_payment,  '0000-00-00 00:00:00',  'No payment' ) , payment_method, amount, rs.name_ru
FROM request AS r, request_status AS rs
WHERE r.status = rs.id
LIMIT 0 , 30

in sql console query is valid, and date_payment is replase, but:

MySqlCommand cmd = new MySqlCommand(query, conn);

        dt.Load(cmd.ExecuteReader());

        GetList();

        source.DataSource = dt;
dataGrid1.ItemsSource = source;

then column(date_payment) in datagrid is null – why?

Answer 1

Your calculated column doesn’t have any name. Add “AS updated_date_payment” keyword and request “updated_date_payment” column in your program:

SELECT r.id, user_name, user_phone, date_create, REPLACE( date_payment,  '0000-00-00 00:00:00',  'No payment' ) AS updated_date_payment, payment_method, amount, rs.name_ru
FROM request AS r, request_status AS rs
WHERE r.status = rs.id
LIMIT 0 , 30