I want to automatically add date in order_date field when a customer checkouts my online shop.
What is the best way to do it?
There are other fields like, delivery data and payment date in the same table.
Is it good idea to add a hidden field so that when a cutomer submit, the date will be added?
But I am not sure how to do it.
Can anyone suggests me the better way to do it please?
No, you don't need a hidden form field. You can do this directly in MySQL.
Assuming that your order_date field is a DATE. DATETIME or TIMESTAMP, then in your SQL that inserts the order record, simply put NOW() as the value for order_date:
INSERT INTO orders (x,y,z,order_date) VALUES ('x','y','z',NOW());
In the update statement that finalizes your order record, do something like this:
update order set ....., order_date = now() where ...
You don't want to rely on client-side date anyway. It could be off, and think of the timezones. You want a single source of dates in your system, and that should be either the database or the server-side code layer (PHP or what have you).
When a customer places an order you can use a TIMESTAMP column to track when the order was placed / the order was saved the database. Something like:
ALTER TABLE sales_order ADD COLUMN date_placed TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
The DEFAULT CURRENT_TIMESTAMP will be filled with the current time when the row is created, but not on subsequent updates. See the docs for more:
http://dev.mysql.com/doc/refman/5.0/en/timestamp.html
With a DEFAULT CURRENT_TIMESTAMP
clause and no ON UPDATE clause, the
column has the current timestamp for
its default value but is not
automatically updated.
Related
I need to record the date each event happens. I have this table.
Click here to view the table
NULL spaces are available to save a new date.
The X represents the date that the event occurred.
The problem is I do not know how to update the date each event occurs
I need to know the best option if you use INSERT or UPDATE querys.
Thank you for your help
If you just want to update a column in a table with the current time:
UPDATE `yourtable` SET `yourcolumn` = NOW() WHERE `ID` = yourid
Assuming your columns are DATETIME() columns.
As an aside, it's best to have event-related information in another relationship table. This way you can link multiple events for each row in your main table. This provides a more accurate data-trail for accounting purposes (or in other words, you can see each and every update without overwriting anything).
If you are seeking to have a 'last_modified' column on your table to help you keep track of changes made on your records, you should do this:
ALTER TABLE my_table
ADD last_modified TIMESTAMP
DEFAULT CURRENT_TIMESTAMP
ON UPDATE CURRENT_TIMESTAMP;
Basically what it does is to add a 'last_modified' column, Set it to be a timestamp and make it to be updated with the current timestamp when there is an update on the record.
Is there a way in MySQL to get insert date/time for rows if there was no insert_date field. I have a database which I configured to store insert_date but can I populate the field before that change ( month ago ). Is that even possible?
Pull that insert date/time from log or something else?
Nope. If that date wasn't stored before, it's impossible to find out when a row was inserted. The best you can do is just pick a date, or maybe make a rough estimate if you have information to base that on (for instance, the create date of a customer might be related to the date of their first invoice)..
By the way, you can add timestamp columns and specify the clause DEFAULT CURRENT_TIMESTAMP to set a timestamp as soon as you insert the row. That way, you don't need a trigger to update the row.
You can even add a clause ON UPDATE CURRENT_TIMESTAMP so the column (or a different column) is updated automatically too.
See Timestamp initialization for more information about this subject.
This doesn't change the fact, though, that you cannot get those values for rows that already exist.
I need to know the time since a table in my MySQL database was edited. Is there any way to do this in PHP? The only way I can think of is to get the update time, and compare it to the current time (which will be a little bothersome).
SELECT TIMEDIFF(CURRENT_TIME, UPDATE_TIME)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'my_table'
One solution would be to add a timestamp field, that is automatically updated whenever a row is changed.
Then you can find the last change time by selecting the last update value:
# Add a timestamp column:
ALTER TABLE [TABLENAME] add column `ts_update` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP;
# Get the last update value:
SELECT MAX(ts_update) from [TABLENAME];
It's a bit of a pain since SHOW TABLE STATUS doesn't seem to return a standard result set. Every way I tried to use it as a subquery failed. It seems like you'll need to figure it out programmatically.
SHOW TABLE STATUS
WHERE name = 'target_table';
And if you're concerned about the timezone just do a separate SELECT NOW() to get the time the mysql server has.
Note: This will only show you the time at which the table schema was updated. If you want to know when the last time a row was inserted/edited you'll have to add a timestamp column like Amirshk suggested.
What is the method to submit a current timestamp directly on an INSERT or an UPDATE? If I were running regular SQL, I would use the function NOW() for the specific SQL field on submission. How would I do that with CakePHP?
$this->Model->save($this->data)
In CakePHP, you can include the NOW() function unescaped by using DboSource::expression
$this->data['SomeModel']['your_datetime_field'] = DboSource::expression('NOW()');
$this->Model->save($this->data);
This is the preferred way of including MySQL functions in your saves.
http://api.cakephp.org/2.3/class-DboSource.html#_expression
if you add the created and modified columns in you table they will be automatically populated with current time stamp. If the case is different - i.e. you want to populate a field which later on you want to modify, probably using the edorian's solution is best.
You can set timestamp field to auto initialize and auto update
timestampfield TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
http://dev.mysql.com/doc/refman/5.0/en/timestamp.html
I have an order table in MySQL database, having a field/column which stores the date timestamp of when the order was placed.
I need to calculate when the order must be shipped. I could probably figure out how to write a function to calculate the ship date and call that when ever needed but I think, not sure it may make more sense to have the shipdate as a calculated column.
That being said, I have never used a stored procedure or created a calculated field. The later I think would be best but again not sure. I used to make calculated field all the time in FMP but I've gotten away from that program.
I would do it as a view. This is basically a select statement where one result column is the ship date. You can add other relevant columns too. Any app with access to the database can then access the view the same way as ordinary tables.
If your table looked like:
create table orders(id INTEGER PRIMARY KEY AUTO_INCREMENT,
order_date DATETIME);
and you always shipped 3 days after, you could use:
create view order_view as
select id,
order_date,
order_date + INTERVAL 3 DAY as ship_date
from orders;
The select statement can be made as complex as needed. Then, you just read order_view in any application, as if it were an ordinary table.