Is there any way that I can compare if a user id is present in deleted_by_id without going through explode function and just use eloquent directly? I am using laravel 4.2 btw. Below is a sample table:
messages
+-----------------------------+------------------+
+ id | message + deleted_by_id +
+-----------------------------+------------------+
+ 1 | hello + 65,72 +
+ 2 | thank you + 54,33,89 +
+-----------------------------+------------------+
I am trying to compare if a user id is present within deleted_by_id so the message will show up on the trash view.
no like or regex, but find_in_set (I guess it's MySQL):
YourModel::whereRaw('find_in_set(?, deleted_by_id)', [$user_id])->get();
And obviously suggestion - normalize the db ;)
You could use a SELECT statement with the LIKE operator as one approach, but this would produce unexpected results as your user id value grew. Another approach would be to use the REGEX feature of MySQL
MySQL Regex
To add to this, since you want to use Eloquent, you could try the whereRaw() statement with Regex...
Message::whereRaw("deleted_by_id REGEX 8{1}9{1}"); //find 89
This is untested, and you would have to update the Regex each time based on what you were looking for, but only option I could see with Eloquent.
Ultimately, your best option is to rethink your table structure so that you can store each user id on its own row.
MySQL Regex Pattern Matching
Related
i have a string field that contains a json string in my table. lets name that tbl_table
lets say it has these 3 records in it:
id json
----------------
1 [123,45,1]
2 [23,4,5]
3 [7,8,9]
now I want to fetch records that contain a number in their json field (using active records in Yii2), so:
$res = Table::find()->where(['like','json','23'])->all();
this query returns these records:
id json
----------------
1 [123,45,1]
2 [23,4,5]
this is not actually a wrong result but what I want is to return only the record with id=2. how can I do this?
and so for ['like','json','5'] or ['like','json','4'] and so on? the numbers are similar but I want the exact number to be match.
and another question I want the last question answer with change in this part ['like','json',[4,5,6]].
in other words I want to pass an array to like operator and it automatically make an OR operation for each element. is it somehow possible? if not how can I iterate on array and make multiple Or_like conditions with last question functionality without multi query executions ?
use expression to use mysql functions and use JSON_CONTAINS function
use yii\db\Expression;
$expression = new Expression('JSON_CONTAINS(fied, value)');
$now = (new \yii\db\Query)->select($expression);
p.s json_contains begins from version MySQL 5.7
refs https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html
http://www.yiiframework.com/doc-2.0/yii-db-expression.html
I'm using mysql database auto-increment as an order ID. When I display the order ID to the user, I want to somehow mask/obfuscate it.
Why?
So at first glance, it is obvious to admin users what the number
refers to (orders start with 10, customers start with 20 etc)
To hide, at first glance, that this is only my 4th order.
Based on this this answer, I want the masked/obfuscated order id to:
Be only numbers
Consistent length (if possible)
Not cause collisions
Be reversible so I can decode it and get the original ID
How would I acheive this in PHP? It doesn't have to be very complex, just so at first glance it's not obvious.
I think you can use XOR operator to hide "at first glance" for example (MySQL example):
(id*121) ^ 2342323
Where 2342323 and 121 are "magic" numbers - templates for the order number.
To reverse:
(OrderNum ^ 2342323)/121
Additional advantage in this case - you can validate OrderNumber (to avoid spam or something like this in online form) if (OrderNum ^ 2342323) is divided by 121 with no remainder.
SQLFiddle demo
A little bit late, but Optimus (https://github.com/jenssegers/optimus) does exactly what is here asked for.
$encoded = $optimus->encode(20); // 1535832388
$original = $optimus->decode(1535832388); // 20
Only the initial setup is a bit weird (generate primenumbers)
Probably the simplest way is to just generate a long random string and use it instead of the auto-increment ID. Or maybe use it alongside the auto-increment ID. If the string is long enough and random enough, it will be unique for every record (think of GUIDs). Then you can display these to the user and not worry about anything.
Can it help?
echo hexdec(uniqid());
Off course you should store this value at db, at the same row with order id.
Just converting a ID into something like HEX might not give you the result what you like. Moreover its still easy 'guessable'
I would a a extra ID column (i.e. order_id). Set a unqi. index. Then on_creation use one of the following mysql functions:
SHA1(contcat('ORDER', id))
MD5(contcat('ORDER', id))
SHA1(contcat('ORDER', id, customer_id))
MD5(contcat('ORDER', id, customer_id))
UUID()
// try this in your mysql console
SELECT UUID(), SHA(CONCAT('ORDER',10)), SHA1(1);
You could (as in the example), add a simple text prefix like 'order'. Or even combine them. However i think UUID() would be easiest.
Implementation depends a bit on what you prefer you could use a stored procedure) or incorporate it in your model.
I am having a table with a column that has few ids that were put into database with multi select. Column for example contains: 1,4,5,7,9. Is it possible to check if this column contains for example number 5 or not in it through MySQL query ?.
I need to select all the people that have number 5 or some other listed in that field and print them through php.
http://dev.mysql.com/doc/refman/5.6/en/string-functions.html#function_find-in-set
SELECT ...
WHERE FIND_IN_SET(5, list_column)
But understand that this search is bound to be very slow. It cannot use an index, and it will cause a full table-scan (reading every row in the table). As the table grows, the query will become unusably slow.
Please read my answer to Is storing a delimited list in a database column really that bad?
You can use #MikeChristensen's answer to be more standard. Another trick with standard SQL is this:
select * from TableName
where ',' || ids || ',' LIKE '%,5,%'
(in standard SQL, || is the string concatenation operator, but in MySQL, you have to SET SQL_MODE=PIPES_AS_CONCAT or SET SQL_MODE=ANSI to get that behavior.)
Another MySQL-specific solution is to use a special word-boundary regular expression, which will match either the comma punctuation or beginning/end of string:
select * from TableName
where ids RLIKE '[[:<:]]5[[:>:]]'
None of these solutions scale well; they all cause table-scans. Sorry I understand you cannot change the database design, but if your project next requires to make the query faster, you can tell them it's not possible without redesigning the table.
Perhaps:
select * from TableName
where ids = '5' -- only 5
or ids like '5,%' -- begins with 5
or ids like '%,5' -- ends with 5
or ids like '%,5,%' -- 5 in the middle somewhere
It probably won't be very fast on large amounts of data. I'd suggest normalizing these multi-selection values into a new table, where each selection is a single row with a link to TableName.
select * from your_table where concat(',',target_column,',') like '%,5,%'
you can write the sql query like this, for example you are looking for the number 5
select * from your_table_name where ids='5'
if you want to check the result with php just tell me i will write it for you :)
I'm looking for a way to compare database values against a given query using MySql
(in oppose of searching the query in the db)
I will elaborate:
I have a table that holds comma separated keywords and a result for each block of keywords
for example :
col 1 col 2
Mercedes,BMW,Subaru car
Marlboro,Winston cigarette
today im taking the user query (for example - Marlboroligt)
as you can see if i will search for the value 'Marlboroligt' in the db i will get no results.
for that matter i want to search 'Marlboro' from the db inside the query and return 'cigarette'
Hope my explanation is sufficient and that this is actually possible :-).
Normalization will help you the most. Otherwise, search in comma delimited fields is discussed here:
Select all where field contains string separated by comma
...and to search 'Marlboroligt' instead of 'Marlboro Light', you can try looking into the LEVENSHTEIN function, or maybe the Soundex encoding (which looks like too little bang for too large a buck, but then again, maybe...).
I see the following possible solutions:
setup a keyword-search engine like Sphinx and use it to search keywords in your db
normalize your db - col1 must contain the only keyword
use like patterns
select col2 from mytable where col1 like "%Marlboro%"
like slows down your application and can have substring-related issues.
Say if I have an array and I want to check if an element is a part of that array, I can go ahead and use in_array( needle, haystack ) to determine the results. I am trying to see the PHP equivalent of this for my purpose. Now you might have an instant answer for me and you might be tempted to say "Use IN". Yes, I can use IN, but that's not fetching the desired results. Let me explain with an example:
I have a column called "pets" in DB table. For a record, it has a value: Cat, dog, Camel
(Yes, the column data is a comma separated value). Consider that this row has an id of 1.
Now I have a form where I can enter the value in the form input and use that value check against the value in the DB. So say I enter the following comma separated value in the form input: CAT, camel
(yes, CAT is uppercase & intentional as some users tend to enter it that way).
Now when I enter the above info in the form input and submit, I can collect the POST'ed info and use the following query:
$search = $_POST['pets'];
$sql = "SELECT id FROM table WHERE pets IN ('$search') ";
The above query is not fetching me the row that already exists in the DB (remember the record which has Cat, dog, Camel as the value for the pets column?). I am trying to get the records to act as a superset and the values from the form input as subsets. So in this case I am expecting the id value to show up as the values exist in the column, but this is not happending.
Now say if I enter just CAT as the form input and perform the search, it should show me the ID 1 row.
Now say if I enter just camel, cAT as the form input and perform the search, it should show me the ID 1 row.
How can I achieve the above?
Thank you.
The function you're looking for is find_in_set:
select * from ... where find_in_set($word, pets)
for multi-word queries you'll need to test each word and AND (or OR) the tests:
where find_in_set($word1, pets) AND find_in_set($word2, pets) etc
IN() Check whether a value is within a set of values
mysql> SELECT 2 IN (0,3,5,7);
-> 0
mysql> SELECT 'wefwf' IN ('wee','wefwf','weg');
-> 1
SELECT val1 FROM tbl1 WHERE val1 IN (1,2,'a');
View: IN MySql
I've got several things for you in terms of feedback & in direct response to your questions:
First, I suggest you sanitize the input. Everybody is going to tell you that. For that, see What’s the best method for sanitizing user input with PHP?.
Second, normalize the input with UPPER() or LOWER() if you want to use MySQL and need to store user-formatted input, or use strtoupper() and strtolower() if you wanted to process the input before storing it.
You're still left with the order in the user query. E.g. "cat, dog" ought to yield the same result as "dog, cat". If you were to code that with a LIKE statement, performance issues are going to eat you alive. Not only would you have to create the query dynamically, you'd also end up with huge and unnecessarily complex queries. In short, forget it. You have to change the way you store your data.
One way to accomplish this is by creating a relationship table that references a table of unique user input and your record. This table would look similar to
user_id | pet_id
Every user could have more than one pet_id associated with them. I've set up a database a long time ago the same way you did and ran into the same issues. Performance-wise it never paid off and it's anything but good style. I ended up changing my structure because of that to the above-mentioned method.
This mysql function search an INT value into a json array of INT:
-- EXAMPLES :
-- select is_into_json_array(18, '[25, 10, 15]'); -> -100
-- select is_into_json_array(25, '[25, 10, 15]'); -> 0
-- select is_into_json_array(15, '[25, 10, 15]'); -> 2
https://github.com/PietroLaGrotta/Json-in-mysql-text-type/blob/master/is_into_json_in_array.sql
Yes, the column data is a comma
separated value
Here is your fault.
No, it shouldn't be comma separated value
And your database structure should be normalized.