I have a database table in mysql with a field that is of "TIMESTAMP" type. I need help writing the SQL query to update the field with the current timestamp.
UPDATE tb_Test set dt_modified = ?????
Use:
UPDATE tb_Test
SET dt_modified = CURRENT_TIMESTAMP
WHERE ? -- if you don't specify, ALL dt_modified values will be updated
You can use NOW() instead of CURRENT_TIMESTAMP, but CURRENT_TIMESTAMP is ANSI standard so the query can be ported to other databases.
ALTER TABLE tb_Test MODIFY COLUMN dt_modified TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP
Now whenever any field is changed the dt_modified will be updated by the special trigger.
Related
I am trying to update date whenever any updates occur on the record, the field type is datetime and I set the default value to CURRENT_TIMESTAMP. when update sql is excuted the result is all zeros!
0000-00-00 00:00:00
$sql = 'INSERT INTO product_shop_offers (id,product_id,shop_id,price,currency_id,added_by,last_update)'
. ' VALUES (?,?,?,?,?,?,?) ON DUPLICATE KEY UPDATE id=?,shop_id=?,price=?,currency_id=?,added_by=?,last_update=?';
$this->db->query($sql, array(
$storeInfoArray['recordId'],
$productId,
$storeInfoArray['storeNameNo'],
$storeInfoArray['price'],
$storeInfoArray['currency'],
$addedBy,
'CURRENT_TIMESTAMP()',
$storeInfoArray['recordId'],
$storeInfoArray['storeNameNo'],
$storeInfoArray['price'],
$storeInfoArray['currency'],
$addedBy,
'CURRENT_TIMESTAMP()'
))
Note: I checked Similar problem question but I didn't understand the problem!!can somebody help please.
Is it because you are binding in the string 'CURRENT_TIMESTAMP()'.. I'm not sure you can do that and it is being converted to zeros.
If you have the default set in the database, why bother binding it in at all? Just remove the field from the statement.. oh and you'll need to add the attribute ON UPDATE CURRENT_TIMESTAMP to the column:
ALTER TABLE product_shop_offers
MODIFY COLUMN last_update DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
If you need it otherwise, you may have to write it into the query directly.
I think it should be helpful for you
MySQL CURRENT_TIMESTAMP field updates on every update
Change CURRENT_TIMESTAMP() to NOW()
Another possible way is to set the field type from datetime to timestamp
I have a field in a MySQL database with default value as current_timestamp
and i wish to insert value as follows:
e.g. 2014-01-25 03:53:14 to 2014-01-25 00:00:00
How can i do this?
Any suggestion or idea would be great help!!!
what you should do is change the type of your field to DATE type. Then create a trigger to SET NEW.field = CURDATE().
Here's an example in sqlFiddle
CREATE TRIGGER default_my_timestamp BEFORE INSERT ON yourTable
FOR EACH ROW
SET NEW.timestamp = CURDATE();
This seems like a really simple one but I'm struggling to figure it out. I want a column in my database that lists when a record was first created and another column that says when it was updated. It's my understanding I should be able to do all this just using MySQL. All help is appreciated :)
This stinks still no answer, reasons I'm already starting to miss Ruby on Rails...
You will probably need to use a combination of the Datetime datatype and the Timestamp data type. I would set my created column as a DateTime with a DEFAULT NOW(), and my updated column as a Timestamp with DEFAULT CURRENT_TIMESTAMP and an ON UPDATE CURRENT_TIMESTAMP attribute.
Here are the docs for the Timestamp dt:
http://dev.mysql.com/doc/refman/5.0/en/timestamp.html
In a CREATE TABLE statement, the first TIMESTAMP column can be declared in any of the following ways:
With both DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses, the column has the current timestamp for its default value, and is automatically updated.
With neither DEFAULT nor ON UPDATE clauses, it is the same as DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP.
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.
With no DEFAULT clause and with an ON UPDATE CURRENT_TIMESTAMP clause, the column has a default of 0 and is automatically updated.
With a constant DEFAULT value, the column has the given default and is not automatically initialized to the current timestamp. If the column also has an ON UPDATE CURRENT_TIMESTAMP clause, it is automatically updated; otherwise, it has a constant default and is not automatically updated.
To fulfill your question and for others viewing this question, here is the answer. Note this was written for MySQL 5.x.
DROP TABLE IF EXISTS `test1`;
CREATE TABLE `test1` (
`id` INT NULL AUTO_INCREMENT ,
`name` varchar(50) NOT NULL ,
`created` DATETIME ,
`updated` DATETIME ,
PRIMARY KEY (`id`),
INDEX (`name`)
);
DELIMITER $$
DROP TRIGGER IF EXISTS `test1_created`$$
CREATE TRIGGER `test1_created` BEFORE INSERT ON `test1`
FOR EACH ROW BEGIN
SET NEW.`created` = UTC_TIMESTAMP();
SET NEW.`updated` = UTC_TIMESTAMP();
END;
$$
DROP TRIGGER IF EXISTS `test1_updated`$$
CREATE TRIGGER `test1_updated` BEFORE UPDATE ON `test1`
FOR EACH ROW BEGIN
SET NEW.`updated` = UTC_TIMESTAMP();
END;
$$
DELIMITER ;
Note
You could use TIMESTAMP for the updated column which would have automatically updated the value thus not requiring the BEFORE UPDATE trigger, however TIMESTAMP has a range from 1970 to 2038 which is fast approaching and I like to think my applications will live forever :). Although TIMESTAMP is only 4bytes while DATETIME is 8bytes.
TIMESTAMP range '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC
DATETIME range '1000-01-01 00:00:00' to '9999-12-31 23:59:59'
From the MySQL 5.0 Certification Guide:
CREATE TABLE ts_test5 (
created TIMESTAMP DEFAULT 0,
updated TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
data CHAR(30)
);
To control the initialization and update behaviour of a TIMESTAMP column, you add either or both of the DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP attributes to the column defintion when creating the table with CREATE TABLE...
and
...if you do not specify either of the DEFAULT CURRENT_TIMESTAMP or ON UPDATE CURRENT_TIMESTAMP attributes when creating a table, MySQL automatically assigns BOTH to the first TIMESTAMP column
Also
you cannot use DEFAULT CURRENT_TIMESTAMP with one column and ON UPDATE CURRENT_TIMESTAMP with another
If you can't use the timestamp fields with default attributes that Paul W has suggested, you can use AFTER INSERT and AFTER UPDATE triggers to populate the fields.
You will need two fields "Created" and
"Updated" with type datetime. When a
new entry is inserted then insert
"Created" with current time stamp.
When a update is happening insert
"Updated" with the current time stamp,
and let the "Created" field remain as
it is.
For current time stamp you can use
NOW() in your mysql query.
project is written on php.
There is timestamp field in mysql it updates automatically. In one case I don`t need update this field. Can I gibe instruction not to update this field in this queries without getting timestamp value.
You should change it to DEFAULT CURRENT_TIMESTAMP otherwise it will auto-update. From the manual:
In a CREATE TABLE statement, the first TIMESTAMP column can be declared in any of the following ways:
With both DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses, the column has the current timestamp for its default value, and is automatically updated.
With neither DEFAULT nor ON UPDATE clauses, it is the same as DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP.
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.
Edit the column in phpMyAdmin and unselect the option for "on update current timestamp."
Here is the table of interest when exported via phpMyAdmin:
CREATE TABLE IF NOT EXISTS `users` (
`ip` varchar(20) NOT NULL,
`lastcheck` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
UNIQUE KEY `ip` (`ip`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
Here is the query:
mysql_query("REPLACE INTO users SET ip = '$uip', lastcheck = '$tim'") or throwerror("part2 ".mysql_error());
$tim is set to be time();
Now for some reason lastcheck is still set as 0000-00-00 00:00:00.
Can anyone help? Thanks.
I am not sure if maybe I understand your problem, looking at column lastcheck declaration CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP that means when ever you update (ip = '$uip') this column an automatic date update will also happen lastcheck. Which mean you can write you update statment as follows :
REPLACE INTO users SET ip = '$uip';
That should also update the lastcheck field, and I think it's better to use the mysql date functions to store your date/time than writing them in php and saving them as string in the database...
try using date('Y-m-d H:i:s') in stead of time()
time() in php returns a unix timestamp and that isn't a valid insert for MyySQL datetime
hope this helps