I have two table called tbl_users and tbl_img_status. I have column in tbl_img_status like below
id, user_id,status_text, scd_time,status,post_time
I am looking for run cron using PHP for publish post on time. So I have query like below
$results = mysqli_query($mysqli,"UPDATE tbl_img_status SET post_time=NOW(),status=1 WHERE status=0 AND scd_time<NOW()");
Now My issue is I also need to update tbl_users column called total_post. I want increase 1 in total_post of that user id which we have published with first query. I am new in PHP and MYSQL so not getting proper idea for do it. Let me know if someone can help me for it.
You can use one query to update two tables.
Try this query if that works.
I have got a hint from this. MySQL, update multiple tables with one query
UPDATE tbl_users, tbl_img_status
SET tbl_img_status.post_time=NOW(),
tbl_img_status.status=1,
tbl_users.total_post = tbl_users.total_post+1
WHERE
tbl_users.id= tbl_img_status.user_id
AND tbl_img_status.status=0 AND tbl_img_status.scd_time<NOW()
You can use Triggers for that purpose.
This would update for a specific user if the status changed from 0 to 1
DELIMITER $$
CREATE TRIGGER after_tbl_img_status_update
AFTER UPDATE
ON tbl_img_status FOR EACH ROW
BEGIN
IF OLD.status <> NEW.status AND NEW.status = 1 THEN
UPDATE tbl_users SET total_post = total_post +1 WHERE id = NEW.user_id;
END IF;
END$$
DELIMITER ;
IF you don't want to change the Database, you can use a INNER JOIN with And update both table as one.
Your php will then look like:
$results = mysqli_query($mysqli,"UPDATE tbl_users tu INNER JOIN tbl_img_status tis ON tu.id = tis.user_id SET tis.post_time=NOW(), tis.status=1, tu.total_post = tu.total_post+1 WHERE tis.status=0 AND tis.scd_time<NOW();");
i don't familiar at database, That is my test syntax:
START TRANSACTION ;
SET #VAR = (SELECT `some ID` FROM `some table` ORDER BY `some ID` DESC LIMIT 1);
SELECT #VAR;
COMMIT;
SELECT #VAR;
i think is result is first select is null (because before commit) and second select is have value, and in my test first and second select have value, why? and how to fix my syntax?
You seem confused. First, changes made within a transaction are visible within the same transaction. Second, transactions are about changes to the database, not changes to the session. After all, the database is ACID-compliant (or not), not the variables in a session.
The first print prints the value present during the transaction. Changes within a transaction are visible -- in the transaction. This is true for changes on tables, as well. If you insert a row in a table and -- in the same transaction -- look for the row, then you will see it.
You should not see the row in another session. You won't see it elsewhere, until the changes are committed.
I want to perform a mysql UPDATE query and then get an array of ids that were effected in the change.
This is my update query
mysql_query("UPDATE table SET deleted='1' WHERE id='$id' OR foo='$foo' OR bar='$bar'");
I know that I can do something like this to get the created id from an INSERT query
mysql_query("INSERT INTO table (id,foo,bar) VALUES ('$id','$foo','$bar')");
$newid = mysql_insert_id();
I don't think MySQL has anything like the OUTPUT or RETURNING clauses that other databases support. You can get the list of ids by running a select before the update:
create table temp_table ids_to_update as
SELECT id
FROM table
WHERE (deleted <> '1' or deleted is null) and *id='$id' OR foo='$foo' OR bar='$bar');
Note that MySQL doesn't do an update when the value doesn't change. Hence the first condition -- which you may or may not find important.
Then, to ensure integrity (in the event of intervening transactions that change the data), you can do:
update table t join
temp_table tt
on t.id = tt.id
set deleted = '1';
You could also wrap the two queries in a single transaction, but I think using a temp table to store the ids is probably easier.
I have a statement I'm using in PHP that will pull a number if it exists or, if it doesn't, it will create a row, then pull the number from the created row.
The following code works but as the title says...not the second time. First let me clarify, it works everytime if the row exists. But when a row is created and the number returned, the next time through (again with new variables) will fail but then (using same new variables again) will work correctly the next time. This is true in both php and in sql environments.
SELECT id FROM table1 WHERE authID = 'DOEJON' AND periodID = 55
IF ##ROWCOUNT = 0 INSERT INTO table1 (authID, periodID) VALUES ('DOEJON', 55);
SELECT id FROM table1 WHERE timeID = SCOPE_IDENTITY()
there appears to be some sort of refresh related to the statement - how can I get the desired results every time? thoughts?
Thank you for your kind attention.
Try Below
Declare #ID Int
SELECT #ID = id FROM table1 WHERE authID = 'DOEJON' AND periodID = 55
If (id is null)
Begin
INSERT INTO table1 (authID, periodID) VALUES ('DOEJON', 55);
Set #ID = SCOPE_IDENTITY()
End
Select #ID As ID
How do I get the ID of the last updated row in MySQL using PHP?
I've found an answer to this problem :)
SET #update_id := 0;
UPDATE some_table SET column_name = 'value', id = (SELECT #update_id := id)
WHERE some_other_column = 'blah' LIMIT 1;
SELECT #update_id;
EDIT by aefxx
This technique can be further expanded to retrieve the ID of every row affected by an update statement:
SET #uids := null;
UPDATE footable
SET foo = 'bar'
WHERE fooid > 5
AND ( SELECT #uids := CONCAT_WS(',', fooid, #uids) );
SELECT #uids;
This will return a string with all the IDs concatenated by a comma.
Hm, I am surprised that among the answers I do not see the easiest solution.
Suppose, item_id is an integer identity column in items table and you update rows with the following statement:
UPDATE items
SET qwe = 'qwe'
WHERE asd = 'asd';
Then, to know the latest affected row right after the statement, you should slightly update the statement into the following:
UPDATE items
SET qwe = 'qwe',
item_id=LAST_INSERT_ID(item_id)
WHERE asd = 'asd';
SELECT LAST_INSERT_ID();
If you need to update only really changed row, you would need to add a conditional update of the item_id through the LAST_INSERT_ID checking if the data is going to change in the row.
This is officially simple but remarkably counter-intuitive. If you're doing:
update users set status = 'processing' where status = 'pending'
limit 1
Change it to this:
update users set status = 'processing' where status = 'pending'
and last_insert_id(user_id)
limit 1
The addition of last_insert_id(user_id) in the where clause is telling MySQL to set its internal variable to the ID of the found row. When you pass a value to last_insert_id(expr) like this, it ends up returning that value, which in the case of IDs like here is always a positive integer and therefore always evaluates to true, never interfering with the where clause. This only works if some row was actually found, so remember to check affected rows. You can then get the ID in multiple ways.
MySQL last_insert_id()
You can generate sequences without calling LAST_INSERT_ID(), but the
utility of using the function this way is that the ID value is
maintained in the server as the last automatically generated value. It
is multi-user safe because multiple clients can issue the UPDATE
statement and get their own sequence value with the SELECT statement
(or mysql_insert_id()), without affecting or being affected by other
clients that generate their own sequence values.
MySQL mysql_insert_id()
Returns the value generated for an AUTO_INCREMENT column by the
previous INSERT or UPDATE statement. Use this function after you have
performed an INSERT statement into a table that contains an
AUTO_INCREMENT field, or have used INSERT or UPDATE to set a column
value with LAST_INSERT_ID(expr).
The reason for the differences between LAST_INSERT_ID() and
mysql_insert_id() is that LAST_INSERT_ID() is made easy to use in
scripts while mysql_insert_id() tries to provide more exact
information about what happens to the AUTO_INCREMENT column.
PHP mysqli_insert_id()
Performing an INSERT or UPDATE statement using the LAST_INSERT_ID()
function will also modify the value returned by the mysqli_insert_id()
function.
Putting it all together:
$affected_rows = DB::getAffectedRows("
update users set status = 'processing'
where status = 'pending' and last_insert_id(user_id)
limit 1"
);
if ($affected_rows) {
$user_id = DB::getInsertId();
}
(FYI that DB class is here.)
This is the same method as Salman A's answer, but here's the code you actually need to do it.
First, edit your table so that it will automatically keep track of whenever a row is modified. Remove the last line if you only want to know when a row was initially inserted.
ALTER TABLE mytable
ADD lastmodified TIMESTAMP
DEFAULT CURRENT_TIMESTAMP
ON UPDATE CURRENT_TIMESTAMP;
Then, to find out the last updated row, you can use this code.
SELECT id FROM mytable ORDER BY lastmodified DESC LIMIT 1;
This code is all lifted from MySQL vs PostgreSQL: Adding a 'Last Modified Time' Column to a Table and MySQL Manual: Sorting Rows. I just assembled it.
Query :
$sqlQuery = "UPDATE
update_table
SET
set_name = 'value'
WHERE
where_name = 'name'
LIMIT 1;";
PHP function:
function updateAndGetId($sqlQuery)
{
mysql_query(str_replace("SET", "SET id = LAST_INSERT_ID(id),", $sqlQuery));
return mysql_insert_id();
}
It's work for me ;)
SET #uids := "";
UPDATE myf___ingtable
SET id = id
WHERE id < 5
AND ( SELECT #uids := CONCAT_WS(',', CAST(id AS CHAR CHARACTER SET utf8), #uids) );
SELECT #uids;
I had to CAST the id (dunno why)... or I cannot get the #uids content (it was a blob)
Btw many thanks for Pomyk answer!
Hey, I just needed such a trick - I solved it in a different way, maybe it'll work for you. Note this is not a scalable solution and will be very bad for large data sets.
Split your query into two parts -
first, select the ids of the rows you want to update and store them in a temporary table.
secondly, do the original update with the condition in the update statement changed to where id in temp_table.
And to ensure concurrency, you need to lock the table before this two steps and then release the lock at the end.
Again, this works for me, for a query which ends with limit 1, so I don't even use a temp table, but instead simply a variable to store the result of the first select.
I prefer this method since I know I will always update only one row, and the code is straightforward.
ID of the last updated row is the same ID that you use in the 'updateQuery' to found & update that row. So, just save(call) that ID on anyway you want.
last_insert_id() depends of the AUTO_INCREMENT, but the last updated ID not.
My solution is , first decide the "id" ( #uids ) with select command and after update this id with #uids .
SET #uids := (SELECT id FROM table WHERE some = 0 LIMIT 1);
UPDATE table SET col = 1 WHERE id = #uids;SELECT #uids;
it worked on my project.
Further more to the Above Accepted Answer
For those who were wondering about := & =
Significant difference between := and =, and that is that := works as a variable-assignment operator everywhere, while = only works that way in SET statements, and is a comparison operator everywhere else.
So SELECT #var = 1 + 1; will leave #var unchanged and return a boolean (1 or 0 depending on the current value of #var), while SELECT #var := 1 + 1; will change #var to 2, and return 2.
[Source]
If you are only doing insertions, and want one from the same session, do as per peirix's answer. If you are doing modifications, you will need to modify your database schema to store which entry was most recently updated.
If you want the id from the last modification, which may have been from a different session (i.e. not the one that was just done by the PHP code running at present, but one done in response to a different request), you can add a TIMESTAMP column to your table called last_modified (see http://dev.mysql.com/doc/refman/5.1/en/datetime.html for information), and then when you update, set last_modified=CURRENT_TIME.
Having set this, you can then use a query like:
SELECT id FROM table ORDER BY last_modified DESC LIMIT 1;
to get the most recently modified row.
No need for so long Mysql code. In PHP, query should look something like this:
$updateQuery = mysql_query("UPDATE table_name SET row='value' WHERE id='$id'") or die ('Error');
$lastUpdatedId = mysql_insert_id();