I have this id number in one column of my table,
0907003
0907004
0907005
1008005
1008006
1008007
1009001
1009002
1009003
When I add new value of 1009, it will add last three number of 004 because the last number begin with 1009 (10-09) is 003.
Or if I add new value of 1008, it will add last three number of 008
because the last number begin with 1008 (10-08) is 007.
Or if I add new value of 0907, it will add last three number of 006
because the last number begin with 0907 (09-07) is 007.
How to do this?
Many thanks in advance!
$front_id = $this->input->post('gameid'); //09
$middle_id = $this->input->post('netid'); //07
//$last_id will be generate automatically by sql
$forID = $front_id.$middle_id;
$sql = "INSERT INTO table ('colum') VALUES (".$forID.")"
You have to insert new id manually
$max_of_letsay1009 = mysql_result(mysql_query("select MAX(id) from table where id like '1009%'"),0);
// get the last 3 digits
$new_number = (int)substr($max_of_letsay1009,-3) + 1;
or you can try this too:
$new_id_of_letsay1009 = mysql_result(mysql_query("select MAX(id)+1 from table where id like '1009%'"),0);
this is just my idea, not yet tested and no error checking
You try this below query
If your value is 1009
SELECT MAX(RIGHT(ID,4))+1 FROM TableName WHERE LEFT(ID,4) = '1009'
It will return the max number of that series.
Try this query for dynamic ID length
SELECT MAX(RIGHT(ID,len(id)-LEN('1009')))+1 FROM #TEMP WHERE LEFT(ID,LEN('1009')) = '1009'
You can also use this query as sub query for the insert statement's ID column.
It is possible if it is not Auto_Increment coulmn.
Just need to write logic on insert time.
Related
I have a Mysql table where pincode field cant be duplicate daily (Sequential increment id), also i cant apply the unique key on that field using Mysql indexing for some reason.
Using PHP i am trying as below, but my code will become endless if i have to keep increasing by checking them as below.
Is there any better way without Mysql indexing to do it from PHP (zend framework)?
$sql = "SELECT count(*) as total
FROM `sh_av_spform`
WHERE DATE(`createdate`) = CURDATE( )";
$result = $db->fetchAll($sql);
if(count($result)>0) {
$tmp_id = $result[0]['total'] +1;
$new_id = sprintf('%03d',$tmp_id); // 009
try{
$sql1 = "SELECT id,pincode
FROM `sh_av_spform`
WHERE DATE(`createdate`) = CURDATE() and pincode='$new_id' limit 1";
$result1 = $db->fetchAll($sql1);
if(count($result1)>0) {
// 009 already exist make it 010?
$tmp_id = $result[0]['total'] +2;
$new_id = sprintf('%03d', $tmp_id); // 010
}
// Ooopsssss! 010 also exist. now what?
// keep wrting code forever? or there is better way?
$db->insert('sh_av_spform', array('pincode'=>$new_id) );// Pincode cant be duplicated
You can do this entirely in database, using a counter table.
Example:
CREATE TABLE daily_pin (day DATE PRIMARY KEY, pin INT UNSIGNED);
START TRANSACTION;
INSERT INTO daily_pin VALUES (CURDATE(),1) ON DUPLICATE KEY UPDATE pin=LAST_INSERT_ID(pin+1);
INSERT INTO table_requiring_pin (pin) VALUES (LPAD(LAST_INSERT_ID(),3,'0'));
COMMIT;
Notes:
The counter table holds a given day's highest as yet used PIN.
The INSERT .. ON DUPLICATE KEY gets a new pin, either a "1" if it's the first entry for a given day, or the current value plus 1.
LAST_INSERT_ID, when given an argument, returns the argument and remembers it for the next time LAST_INSERT_ID is called without an argument.
Finally, left pad it with LPAD to get the "000" format you're wanting.
As a side benefit of this approach, you get easy metrics on pin usage. Like, "what day of the week consumes the most pin?"
You can create one separate function for checking pin code before you insert.
For example
public function ValidatePinCode($PinCode){
if(isset($PinCode)){
$SQL=$db->prepare("SELECT pincode FROM `sh_av_spform` WHERE pincode='".$PinCode."'");
$SQL=$db->execute($SQL);
if($SQL->fetchColumn()>0){
$ResponseCode='FALSE';
}else {
$ResponseCode='TRUE';
}
return $ResponseCode;
}
}
If you get FALSE response then do not allow to insert new pin code else you can perform INSERT query.
Let me know if you want even more explanation on this.
I am trying to update "new" column value with new value but problem is my query remove previous data while inserting new value
What is want: here is example table structure,
Table name = agg_lvl primary key set = uid
uid | new
--------|--------
1 | 100
2 | 300
You can see "new" has 100 points, for example I send 100 new points to user 1, so new column value should be 100 + 100 = 200, right now with this code
$query4 = mysql_query("INSERT INTO agg_lvl (uid, new) VALUES ('$uid','$new')
ON DUPLICATE KEY UPDATE uid='$uid',new='$new'");
Not sure what
new = '$new'
I have tried both ways but no success = >
new = 'new + $new' or new = new + '$new'
You should make changes in your query
Make num = nun+$num to add new value to old one
Remove quotes arount $new because it is a number but not a string
Remove uid from set list because insert already point to that record
And your query should look so:
$query4 = mysql_query("INSERT INTO agg_lvl (uid, new) VALUES ('$uid','$new')
ON DUPLICATE KEY UPDATE new=new+$new");
Okay first i will answer with the proper way to do the same, In this case i am assuming that UID is unique, so you make a new table scorecard with UID as foreign key. Now rather than update, you just insert stuff to table like if UID 1 gains 10 and 20 points, there are two entries. onw with 10 and one with 20. Now to get his current points, you add all points where UID=1 .
Now in your implementation the correct query would be
UPDATE userData SET points = points + x WHERE UID = $uid
where x is the new points gained and points is the name of column
$query4 = mysql_query("INSERT INTO agg_lvl (uid, new) VALUES ('$uid','$new')
ON DUPLICATE KEY UPDATE uid='$uid',new=new+$new");
worked for me with help of #splash58
Following is my database in mysql:
Id Username Password
1 admin admin
2 jay jay1
3 suman xyza
4 chintan abcde
This is my code in php:
$fetchid = mysql_query(" SELECT MAX(Id) As max From user;");
$row = mysql_fetch_array($fetchid);
$largest = $row['max'];
$largest++;
$user= $_POST['username'];
$pass= $_POST['password'];
$result = mysql_query(" INSERT INTO `proshell`.`user` (
`Id` ,
`Username` ,
`Password`
)"."
VALUES (
'".$largest."', '".$user."', '".$pass."'
);");
Problem:
Now if I delete row with Id=1 and then re-enter the data then it should use ID=1 then Again I reinsert the data it use ID=5
It works like this:
if I delete row with Id=1 and then re-enter the data the Id it gets is 5 but then 1 is free so,
What should I write to perform that task.
First, if you set your Id column to AUTO_INCREMENT you don't need the following part in your code at all:
$fetchid = mysql_query(" SELECT MAX(Id) As max From user;");
$row = mysql_fetch_array($fetchid);
$largest = $row['max'];
$largest++;
Because AUTO_INCREMENT will automatic add new value to your ID colume.
But if you don't set it to AUTO_INCREMENT, the above code will grab the MAXIMUM ID value (in this case, 4).
When you re-enter your data again after you delete the row 1, the MAXIMUM ID still 4, so your new ID value will be 5 (from $largest++;).
.....
If you really need to use consecutive ids as you PK, you need to re-write you code but I suggest you to use UUID for you ID column instead.
You can easily generate UUID by using uuid().
How about the UUID performance? Refer to Dancrumb's answer about this:
A UUID is a Universally Unique ID. It's the universally part that you should be considering here.
Do you really need the IDs to be universally unique? If so, then UUIDs
may be your only choice.
I would strongly suggest that if you do use UUIDs, you store them as a
number and not as a string. If you have 50M+ records, then the saving
in storage space will improve your performance (although I couldn't
say by how much).
If your IDs do not need to be universally unique, then I don't think
that you can do much better then just using auto_increment, which
guarantees that IDs will be unique within a table (since the value
will increment each time)
see. UUID performance in MySQL?
EDIT: I don't suggest you run query on the whole table just to find the MAX ID value before inserting new value everytime, because it will give you a performance penalty (Imagine that if you have million rows and must query on them everytime just to insert a new row, how much workload causes to your server).
It is better to do the INSERT just as INSERT, no more than that.
EDIT2:
If you really want to use consecutive ids, then how about this solution?
Create new TABLE just for store the ids for insert (new ids and the ids that you deleted).
For example:
CREATE TABLE cons_ids (
ids INT PRIMARY KEY,
is_marker TINYINT DEFAULT 0
);
then initial ids with values from 1-100 and set marker to be '1' on some position, e.g. 80th of whole table. This 'marker' uses to fill your ids when it's nearly to empty.
When you need to INSERT new Id to your first table, use:
$result = mysql_query("SELECT ids, marker FROM cons_ids ORDER BY ids ASC LIMIT 1;");
$row = mysql_fetch_row($result);
and use $row[0] for the following code:
INSERT INTO yourtable (Id, Username, Password)
VALUES ($row[0], $username, $password);
DELETE FROM cons_ids
WHERE ids = $row[0];
This code will automatically insert the lowest number in cons_ids as your Id and remove it from the cons_ids table. (so next time you do insert, it will be the next lowest number)
Then following with this code:
if ($row[1] == 1) {
//add new 100 ids start from the highest ids number in cons_ids table
//and set new marker to 80th position again
}
Now each time you delete a row from your first table, you just add the Id from the row that you deleted to cons_ids, and when you do INSERT again, it will use the Id number that you just deleted.
For example: your current ids in cons_ids is 46-150 and you delete row with Id = 14 from first table, this 14 will add to your cons_ids and the value will become 14, and 46-150. So next time you do INSERT to your first table, your Id will be 14!!.
Hope my little trick will help you solve your problem :)
P.S. This is just an example, you can modify it to improve its performance.
First of all, as I understand, you are selecting highest column ID which should be always the last one (since you set auto-increment on ID column).
But what are you trying to do is actually filling up holes after delete query, right?
If you are really looking for such approach, try to bypass delete operation by making new boolean column where you flag record if it is active or not (true/false).
SQL table change:
Id Username Password Active
1 admin admin false
2 jay jay1 true
3 suman xyza false
4 chintan abcde true
PHP request:
$fetchid = mysql_query(" SELECT MIN(Id) As min FROM user WHERE active = false;");
$result = mysql_query(" INSERT INTO `proshell`.`user` (
`Id` ,
`Username` ,
`Password`
`Active`
)"."
VALUES (
'".$largest."', '".$user."', '".$pass."', 'true'
);");
I have a MySql table which consists a field serial_no. I want that, when a new row is being inserted, it should set the serial_no field as next of previous maximum of serial_no.
Lets say, previous max of serial_no is 10, then the new row will be inserted with serial_no 11.
Below is how do I currently manage this.
$max_ser = mysql_query("SELECT MAX(serial)+1 as next_ser FROM widgets WHERE position='".$position."'");
if($max_ser){
$row_ser = mysql_fetch_array($max_ser);
}
$insert = 'INSERT INTO widgets(widget_name, widget_alias, widget_type, position, publish_to, serial, status)
VALUES("'.$name.'", "'.$alias.'", "'.$type.'", "'.$position.'", "'.$menus.'", "'.$row_ser['next_ser'].'", "'.$status.'")';
Can it be done in MySql with a single statement?
Any help is appreciated.
Thanks.
I think you are looking for MySql's AUTO_INCREMENT attribute.
If you want to specify your starting point to another number, use:
ALTER TABLE <YOUR_TABLE> AUTO_INCREMENT = 999
I need help in the following query in php. I want to create auto number like 0001, 0002.
I am using this query
$query = "SELECT MAX(cast(registration_code as decimal)) id FROM accounts ";
if($result = mysql_query($query))
{
$row = mysql_fetch_assoc($result);
$count = $row['id'];
$count = $count+1;
$code_no = str_pad($count, 4, "0", STR_PAD_LEFT);
}
It is working right but the problems is that when i delete any number like 0001, 0002, 0003 and i delete 0002 this create 0004 i want this will create deleted number i mean 0001 to 0003 if missing any that creat
thanks
used this query
SELECT ( accounts1.registration_code + 1) as gap_starts_at,
(SELECT MIN( accounts3.registration_code) -1 FROM arrc_vouchers accounts3 WHERE accounts3.registration_code > accounts1.registration_code) as gap_ends_at
FROM arrc_vouchers accounts1
WHERE NOT EXISTS (SELECT accounts2.registration_code FROM arrc_vouchers accounts2 WHERE accounts2.registration_code = accounts1.registration_code + 1)
HAVING gap_ends_at IS NOT NULL
Go fancy. Write a trigger to update next auto increment value on insert. Write trigger on delete to update the next auto increment value to the deleted id if it is lower than the current next auto increment.
I think you are trying to fill spaces of deleted auto increment primary no.
You can read this references..
Make auto increment fill previously deleted number
How to fill in the “holes” in auto-incremenet fields?