I have this record in my database
| 29 | Mac 190:193:194:195:196:197:198:199:200 |
the last column name is
path_address
if I have a string like this
190:193:194:195
I want MySQL to select the path_address that has same sequence
so I used this command
$query_data = $module_model::where('path_address','LIKE',"$structure%")->limit(7)->get();
where structure is :190:193:194:195 and it is working fine, but what is happening is that if I have string like this
190:193:194:195:197
it is also return mac as a result of this query ,
how can I set my query to bring the string that have same sequence only and stop if it has broken sequence , so the accepted sequence will be like this
190
190:193
190:193:194
190:193:194:195
190:193:194:195:196 and so on
but theses sequence must be rejected
190:194
190:193:194:196
190:193:196
190:193:194:195:196:198 etc .
For example, you may use
WHERE path_address LIKE '$structure%'
OR '$structure' LIKE CONCAT(path_address, '%')
First condition will return rows where path_address is not shorter than $structure, second - where it is not longer respectively.
fiddle
I want to update a field on a really huge (1m rows) table. I want to update it from:
+-----------------------------------------------------------+
| ref |
+-----------------------------------------------------------+
| 0001___000000000003616655___IVANTI UK___TEMPLATE MATERIAL |
+-----------------------------------------------------------+
to:
+-------------------------------+
| ref |
+-------------------------------+
| IVANTI UK___TEMPLATE MATERIAL |
+-------------------------------+
So basically its just changing the ref (which is not fixed length) from sid___sku___mfr___pnum to mfr___pnum format.
In PHP I'd do it like so (pseduo code):
list($p['sid'], $p['sku'], $p['mfr'], $p['pnum']) = explode('___', $row['ref']);
$row['ref'] = $p['mfr'] . '___' . $p['pnum'];
Wondering if its possible to do it directly with MySQL with a performant query?
select SUBSTRING_INDEX(ref,'___',-2) from test
0001___000000000003616655___IVANTI UK___TEMPLATE MATERIAL
=>
IVANTI UK___TEMPLATE MATERIAL
https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_substring-index
SUBSTRING_INDEX(str,delim,count)
Returns the substring from string str before count occurrences of the
delimiter delim. If count is positive, everything to the left of the
final delimiter (counting from the left) is returned. If count is
negative, everything to the right of the final delimiter (counting
from the right) is returned. SUBSTRING_INDEX() performs a
case-sensitive match when searching for delim.
I have the above table: tblCompInfo, the product_id value is not 100% accurate and I need to fix it. I have total of 543847 total row with 25 different company and 12 different products.
now, The URL is 100% accurate and as you can see from the image I have highlighted with RED which means they are wrong and GREEN which is what it should be updated to.
TASK:
I need to update Product_id by parsing through URL and getting the INTEGER and checking it with product table, if its a product, assign the value else assign 0.
SOLUTION:
I got two solution in my head:
1. EXPORT the entire DATA to EXCEL CVS, change it and UPLOAD it to DATABASE. which means my entire week will be working with EXCEL only.
2. Since I have laravel framework: I can make a function in PHP and get the DATA company wise and UPDATE the table in a foreach loop with condition.
PROBLEM:
So, to make my life easy, I made the PHP function with a simple solution and it works BUT I get MEMORY ALLOCATION PROBLEM.
$companyID = ??;
$tblCompInfos = tblCompInfo::where('company_id', '=', $companyID)->get();
foreach($tblCompInfos as $tblCompInfo)
{
$actual_link = $tblCompInfo->url;
$pathlink = parse_url($actual_link, PHP_URL_PATH);
$product_id_from_url = preg_replace("/[^0-9]/", "" , $pathlink);
$FindIfItsInProductTable = Product::find($product_id_from_url);
$real_product_id = $FindIfItsInProductTable == null ? 0 : $product_id_from_url;
DB::table('tblCompInfo')->where('company_id', '=', $companyID)->where('url', '=', $tblCompInfo->url)->update(array(
'product_id' => $real_product_id,
));
echo $actual_link."-".$real_product_id."=".$tblCompInfo->product_id."<br>";
}
if it was a local server, I would have update my PHP.ini with more memory and do the job.
However, I have a LIVE server and it has to be done in the live server and I have no control or power over PHP.ini.
What to do? How can I do it easily that I will not get a memory issue?
Please help if anyone?
Try this :
UPDATE [table_name] SET product_id = CONVERT(SUBSTR(url, LOCATE('products/', url)+9, LOCATE('/compare',url)-LOCATE('products/', url)+9),UNSIGNED INTEGER)
But this will only works if every url field has suffix as /compare
if you use MariaDB you can use REGEXP_REPLACE to do the changes like
UPDATE your_table
SET url = REGEXP_REPLACE(url,'[0-9]+',Product_id)
WHERE Product_id > 0;
sample
MariaDB [your_schema]> SELECT REGEXP_REPLACE('http://example.com/products/12/compare','[0-9]+','99');
+--------------------------------------------------------------------+
| REGEXP_REPLACE('http://example.com/products/12/compare','[0-9]+','99') |
+--------------------------------------------------------------------+
| http://example.com/products/99/compare |
+--------------------------------------------------------------------+
1 row in set (0.00 sec)
MariaDB [your_schema]>
I have a pretty odd idea but it can work.
Look at that query :
SELECT
'http://example.com/products/12/compare' as url,
'http://example.com/products/' as check1,
'http://example.com/termsets/' as check2,
'http://example.com/products/12/compare' REGEXP 'http://example.com/products/' as regexp_check1, -- check 1
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),1 ) as test1,
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),1 ) REGEXP "^[0-9]+$" as test1_only_num,
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),2 ) as test11,
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),1 ) REGEXP "^[0-9]+$" as test11_only_num,
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),3 ) as test111,
SUBSTRING('http://example.com/products/12/compare', LOCATE('http://example.com/products/','http://example.com/products/12/compare')+LENGTH('http://example.com/products/'),1 ) REGEXP "^[0-9]+$" as test111_only_num;
Result :
+----------------------------------------+------------------------------+------------------------------+---------------+-------+----------------+--------+-----------------+---------+------------------+
| url | check1 | check2 | regexp_check1 | test1 | test1_only_num | test11 | test11_only_num | test111 | test111_only_num |
+----------------------------------------+------------------------------+------------------------------+---------------+-------+----------------+--------+-----------------+---------+------------------+
| http://example.com/products/12/compare | http://example.com/products/ | http://example.com/termsets/ | 1 | 1 | 1 | 12 | 1 | 12/ | 0 |
+----------------------------------------+------------------------------+------------------------------+---------------+-------+----------------+--------+-----------------+---------+------------------+
Url, check1 and check2 are just to display the variables I'm using. It's a main ID, the query is not usable that way of course.
Logic with check1
You check with a REGEX if check1 is present in your URL. If yes, regexp_check1 is 1, else it's 0.
ONLY if regexp_check1 is 1, then you SUBSTRING your URL to take the part that is located AFTER the check1 sentence. You take the first character AFTER (test1), then the two characters AFTER (test11), the three characters AFTER (test111) etc.. until the max length your ID_PRODUCT can be (6 or 7 for example).
You REGEX the SUBSTR you isolated to check if they are numeric only (test1 is numeric, test11 is numeric only, test111 is not numeric only.
Then you know that the content of test11 is your ID
Then you do the same thing with check2 if regexp_check1 was 0, and with an eventual check3 (which would contain http://www.comadso.dk/products/ for example), and for every beginning you can have.
Maybe my idea is a shitty one, but hey if it's seem dumb but works, it's not dumb !
I have a Laravel5 web application of Business directory.
When I Encrypting a value like
$cryptval = Crypt::encrypt(1);
result = eyJpdiI6IndhaFZFNlhIRDlURzdXanJVMEhBM0E9PSIsInZhbHVlIjoidWF3VzRFZDhyRHltUlwveDdyV0VVWnc9PSIsIm1hYyI6IjE5YjA2YWIyN2Q0MTBlYjdhNDJiNDE5ZjY2OGQ2MDA2NzQ3ZTA4ODc4NzY0ZTIwMjBiMzQxN2RjNmM5ZDg3ZjYifQ==
its giving a long string about 250 length.
Is there any way to limit the length of this string in laravel?
My Client needs to add the URL with encrypted value in a mail function.
eg:
www.example.com/varify/eyJpdiI6IndhaFZFNlhIRDlURzdXanJVMEhBM0E9PSIsInZhbHVlIjoidWF3VzRFZDhyRHltUlwveDdyV0VVWnc9PSIsIm1hYyI6IjE5YjA2YWIyN2Q0MTBlYjdhNDJiNDE5ZjY2OGQ2MDA2NzQ3ZTA4ODc4NzY0ZTIwMjBiMzQxN2RjNmM5ZDg3ZjYifQ==
But the mail function only allow some length of URL :(
One solution is to store the hashed values in a table, and then reference the hash by the auto-incrementing ID of the hash value.
| id | hash | timestamp | random_key |
| 1 | some-hash | 125346164 | 21415 |
| 2 | some-other-hash | 123513515 | 25151 |
So now, instead of using:
www.example.com/verify/some-hash
You can use:
www.example.com/verify/1
The id should really be obfuscated, and not used just as an integer - which is where the timestamp and random_key can help.
$id = 1;
$timestamp = 125346164;
$randomKey = 21415;
$key = base64_encode($timestamp . $randomKey . $id);
echo 'http://www.domain.com/verify/' . $key;
// http://www.domain.com/verify/MTI1MzQ2MTY0MjE0MTUx
All that being said, my recommendation would be to try to work around the limitation put in place by the e-mail delivery platform as URL's can support an address length of around 2000 characters. The example you gave only had a length of 32 and falls well within the lengths acceptable by any modern browser.
Edit: Just generate a uuid using a package like this rather than trying to create your own random id. This will produce a string such as d3d29d70-1d25-11e3-8591-034165a3a613.
I think dont need to store nothing in database, that is a hard work,
In my case a use base64_encode in blase and use base64_decode in controller to show the real value to method and continue the process.
I just faced the same problem. I simply added a column 'hash' in my database table. Then I filled it with a md5(encrypt($model->id))
The md5 value is much shorter, and because it also uses Laravel's crypt, it can't be guessed.
For example, this is my table, which is called example:
--------------------------
| id | en_word | zh_word |
--------------------------
| 1 | Internet| 互联网 |
--------------------------
| 2 | Hello | 你好 |
--------------------------
and so on...
And I tried using this SQL Query:
SELECT * FROM `example` WHERE LENGTH(`zh_word`) = 3
For some reason, it wouldn't give me three, but would give me a lot of single letter characters.
Why is this? Can this be fixed? I tried this out in PhpMyAdmin.
But when I did it with JavaScript:
"互联网".length == 3; // true
And it seems to work fine. So how come it doesn't work?
you should use CHAR_LENGTH instead of LENGTH
LENGTH() returns the length of the string measured in bytes.
CHAR_LENGTH() returns the length of the string measured in characters.
LENGTH returns length in bytes (and chinese is multibyte)
Use CHAR_LENGTH to get length in characters
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_char-length
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_length