so I have this code:
$query = "REPLACE INTO {tbl} SET a_id = %d, p_id = %d, comment = '%s'";
db_query($query,1321,-1,"lolo");
but then when I execute it, instead of inserting -1, it inserted 0 instead....
using INSERT does the same thing...
how can I set this to -1?
using drupal 6
also the p_id column is just an integer in mysql
I would check that p_id is not flagged as unsigned integer
Related
In my php code, I have a Mysql query:
SELECT COUNT(*)
to see if the record already exists, then if it doesn't exist I do an:
INSERT INTO <etc>
But if someone hits reload with a second or so, the SELECT COUNT(*) doesn't see the inserted record.
$ssql="SELECT COUNT(*) as counts FROM `points` WHERE `username` LIKE '".$lusername."' AND description LIKE '".$desc."' AND `info` LIKE '".$key."' AND `date` LIKE '".$today."'";
$result = mysql_query($ssql);
$row=mysql_fetch_array($result);
if ($row['counts']==0) // no points for this design before
{
$isql="INSERT INTO `points` (`datetime`,`username`,`ip`,`description`,`points`,`info`, `date`,`uri`) ";
$isql=$isql."VALUES ('".date("Y-m-d H:i:s")."','".$lusername."',";
$isql=$isql."'".$_SERVER['REMOTE_ADDR']."','".$desc."','".$points."',";
$isql=$isql."'".$key."','".$today."','".$_SERVER['REQUEST_URI']."')";
$iresult = mysql_query($isql);
return(true);
}
else
return(false);
I was using MyISAM database type
Instead of running two seperate queries just use REPLACE INTO.
From the documentation:
REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted.
For example if your key field is id then:
REPLACE INTO my_table SET id = 4 AND other_field = 'foobar'
will insert if there is no record with id 4, or if there is then it will replace the other_field value with foobar.
I'm trying to obtain the max primary key in the REDES table in order to add one but it's not working. I was also wondering if this would be the best way to do it and if it's secure.
// mysql inserting a new REDES field
//$redes_maxid = mysql_query("SELECT MAX(id_redessociales) AS id FROM REDES");
//$newmaxid = $redes_maxid + 1;
$redes_maxid = mysql_fetch_row(mysql_query("SELECT max(id_redessociales) AS id FROM REDES"));
$newmaxid = $redes_maxid[0] + 1;
mysql_query("INSERT INTO REDES(id_redessociales, facebook, twitter, linkedin, pinterest) VALUES ('$newmaxid', NULL, NULL, NULL, NULL");
Thanks!
What you're doing is very unsafe and wrong.
This is why we have auto increment fields in databases, just set the id field in your table to auto increment then when inserting a new row simply pass in NULL for the id, MySQL it will automatically do this increment for you safely.
here's a link to the documentation
You can get last id by ordering in descending order and limiting 1 row result
replace this line
$redes_maxid = mysql_fetch_row(mysql_query("SELECT max(id_redessociales) AS id FROM REDES"));
with
$redes_maxid = mysql_fetch_row(mysql_query("SELECT id_redessociales AS id FROM REDES order by id_redessociales DESC limit 1"));
exactly what A.B said
But shouldn't you be making the ID's row in the database auto incremented?
you can set it to auto increment and when you insert a record just make the inserted ID NULL, the database will automaticly number it to the last ID+1
if you are ysing mySql then you can use this SQL statement
ALTER TABLE `myTable` CHANGE `id` `id` TINYINT( 3 ) PRIMARY KEY UNSIGNED NOT NULL AUTO_INCREMENT
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
MySQL trigger to update a field to the value of id
Please I have a table with three fields :
Id (auto increment)
GroupById
Text
And I want when inserting a new row : If I left the field groupById blank, it must get by default the same value of the field Id.
Please have you any Idea ? Thanks in advance.
Edit : My code :
mysql_query("INSERT INTO group SET GroupById = (must get the current Id), Text = 'bla bla bla' ");
How about a trigger:
DELIMITER $$
CREATE TRIGGER trg_yourtable
BEFORE INSERT ON yourtable
FOR EACH ROW
BEGIN
IF NEW.GroupById IS NULL THEN
SET NEW.GroupById = (
SELECT AUTO_INCREMENT
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = DATABASE()
AND TABLE_NAME = 'yourtable'
);
END IF;
END $$
I'm not sure how safe this is... or what happens when you insert multiple rows from one query, or when two connections attempt to insert at the same time... but it works.
This simple SQL should do what you want:
INSERT INTO myTable (GroupById, Text) VALUES (NULL, 'your text');
SET #lastID = LAST_INSERT_ID();
UPDATE myTable SET GroupById = #lastID WHERE Id = #lastID;
Use a stored procedure
Get the MAX id
Add 1 to it and add insert it into both rows
You get the desired result in a single transaction.
Hope this helps.
Use this function | Tested
Example of use:
function get_current_insert_id($table)
{
$q = "SELECT LAST_INSERT_ID() FROM $table";
return mysql_num_rows(mysql_query($q)) + 1;
}
$txt = "text";
$groupID = '';
if ( empty($groupID) ) { $groupID = get_current_insert_id(test); }
$query = mysql_query("INSERT INTO test VALUES ('', '$groupID', '$txt') ");
if ( $query ) { echo 'Saved using ID:' . $groupID; } else { echo 'Oh noes!' . $query; }
Looks like you might need to run 2 queries:
insert into 'table' ('GroupById', 'Text') VALUES ('{group id}', '{sometext}')
update 'table' set GroupById = id where GroupById = null - it mightbe 0 instead of null depending on what you insert in db.
You can always optimize it through indexes, limits, order.
I have a table with the following fields: gallery(picID, picTimeStamp, location).
What I want is that when someone is uploading a new picture to the gallery, the location will get the same value that picID gets (and picID gets its value by auto increment).
I have tried:
"INSERT INTO gallery(picID, picTimeStamp, location) VALUES (null,'.time().',picID)"
but it is not working. I do not get any errors, the location just always has a zero in it.
Thanks!
You should probably be using trigger like this
CREATE TRIGGER trigger_name BEFORE INSERT ON gallery FOR EACH ROW
BEGIN
DECLARE next_id INT;
SET next_id = (SELECT AUTO_INCREMENT FROM gallery WHERE TABLE_NAME='gallery');
SET NEW.location=next_id;
END
edit: Should be after insert trigger instead of before because auto_increment number only gets set after the record is inserted. Sorry bout that!
Your table should be like this:
id | int | primary key/autoincrement
order | int | index
picTimeStamp | timestamp
and then if you want to create a new entry below pass the order number by GET:
function createBelow(){
if(isset($_GET["orders"])){
$orders = $_GET["orders"];
$query = "UPDATE links SET orders=orders+1 WHERE orders>$orders ORDER BY orders DESC";
mysql_query($query);
$query = "INSERT INTO `mydb`.`mytable` (`orders`) VALUES ($orders+1);";
mysql_query($query);
}
}
The default value takes care of id and timestamp, you don't enter these.
I have my database with table test1.
It has a primary id "Id" which is auto-increment.
Now the id is in the format 1,2,3.. . .Is it possible to store the primary Id as
PNR1,PNR2,PNR3 .. . . and so on(with auto-increment).
No. Either add the prefix in the query, or use a view instead.
Not really, but you can use another column (but a view)
this is already covered here:
MySQL Auto Increment Custom Values
Yes you can do it if you have INT prefix. You have id as INT in table
// START PREFIX
$query = mysql_query("SELECT id FROM `table_name` ORDER BY id DESC LIMIT 1");
// GET THE LAST ID MAKE SURE IN TABLE YOU 9991
while ($row = mysql_fetch_object($query)) {
$lastId = $row->id;
}
list($prefix,$Id) = explode('999',$lastId );
$Id = ($Id+1);
$new_id = '999'.$Id;
// END PREFIX
$insertQuery = mysql_query("INSERT INTO `table_name` SET id = '".$new_id."',...");
Hi, I made it work in this way :
Products Table (products):
id_prod(varchar(11), NOT NULL, PK), name(varchar(40))
Products Sequence Table (productidseq):
id(AI, PK, NOT NULL)
Before Insert Trigger in Products Table:
CREATE DEFINER=`root`#`localhost` TRIGGER `dbname`.`products_BEFORE_INSERT` BEFORE INSERT ON `products` FOR EACH ROW
BEGIN
insert into productidseq (id) values(NULL);
set new.id_prod = concat('PROD or any prefix here',last_insert_id());
set #productId = new.id_prod; -- To use outside of trigger this variable is useful.
END
When you run below query :
insert into products (name) values('Bat');
data inside tables will we be like this :
products:
id | name
---|-----
1 | Bat
productidseq:
id
---
1
If any better way than this or any cons with this, please comment below. Thanks.