I'm developing an API for Cakephp where I pass some query parameters from a controller to another. These query must be arbitrary and could be related to several different models but the interesting result is always an integer.
The problem is that CakePHP always return an array with a different structure and keys for this array are always different.
How can I access the value I need or simplify the query to return a simple value?
I think you should look at Set::extract and rewrite the name of your fields in an unified way
<?
$res = $this->Model->query('select Model.myfield as myint from mytable Model');
$res = Set::extract( "/Model/myint", $res );
// $res = array( 0 => "value 1", ...);
see http://book.cakephp.org/view/1501/extract
or play a bit with array_shift to extract the first value in a loop.
hope this help. L
Related
Database table SITE has many columns. One of them is site_id. I need all the site_ids as an array since it has to be fed to a method which accepts only a string array.
What I tried so far is:
$sites = DB::select('select site_id from site_tab');
$sites_arr = $sites->toArray();
But this doesn't produce the result I want. I need $sites_arr to be like ['A','B','C',...]
Please suggest a way to get this done. A solution based on Eloquent is also OK for me.
Thanks
Try this:
DB::table('site_tab')->pluck('site_id')->toArray();
reference pluck
referen toArray
If you open a manual, you will see that
The select method will always return an array of results
So, there's no need to use ->toArray(), as result is already an array.
To get values as array of names you can do:
$site_ids = DB::table('site_tab')->pluck('site_id');
Using ->toArray() here is optional, as you can iterate over $site_ids (which is a Collection) with a foreach too.
I am trying to get all values of a column, and then use it in another query. I used lists and got the values as an array but, I couldn't find the way to check that variable (array containing each id) in other query
$subscribes = Subscribe::where('from_id', $currentUser)->lists('id')
// dd($subscribes), logs values as array.
$videos = Photo::where('id', $subscribes)->get();
This doesn't work because $subscribes is an array.
Should I use a for loop and send another query for each id? Or is there a practical way that I am missing out? What is the proper way of using it?
Use whereIn method:
$videos = Photo::whereIn('id', $subscribes)->get();
http://laravel.com/docs/5.1/queries (scroll down / search 'whereIn')
Apply whereIn method
if(is_array($subscribes) && count($subscribes) > 0){
$videos = Photo::whereIn('id', $subscribes)->get();
}
In CakePHP3, there is a ORM that helps with building queries.
From the documentation, I can see that
$query = $articles->find(); // build a query that has not run yet
$query->where(['id' => 1]); // Return the same query object
So in this case, I want the string
WHERE `articles`.`id` = 1
After much googling, I found out that there is a way to return just the where clause of a query object.
$query->where(['id' => 1])->clause('where'); // Return the where clause in the form of a QueryExpression
More googling leads me to find out how to get the QueryExpression to spit out string representation
$query->where(['id' => 1])->clause('where')->sql($valueBinder); // Return the where clause in string format
Here is my problem. I don't know what the $valueBinder is supposed to look like. I don't know how to initialize it.
I am also happy not to use ValueBinder as long as I can get the where clause in string format using CakePHP 3 ORM and in the right SQL dialect. Please assume I am using MySQL.
Please advise.
EDIT
I tried to use $query->valueBinder() as the $valueBinder.
It is empty and does not contain the associated c:0 to the value 1.
To directly answer your question, you can get the SQL for any clause this way:
$binder = new \Cake\ORM\ValueBinder();
$query->clause('where')->sql($binder);
That will return the SQL with the correct placeholders, not with the values to be used. The values live in the $binder variable and are used for statement objects.
As I can see, you only wanted to preserve the internal structure of the where clause to pass it to another query in a different request. Your solution is fine, but I'd like to add that you can also encode a full conditions tree from an existing query:
$where = serialize($query->clause('where'));
$anotherQuery->where(unserialize($where)); // A query in another request
In any case, you need to be careful with what you are unserializing as taking it directly from user input will certainly lead to security problems.
You can choose to omit this param if you like. Please see http://api.cakephp.org/3.0/class-Cake.Database.Query.html#_sql
In addition, you can use the Query member function traverse($visitor, $parts) to isolate the where clause. $visitor is a function that takes a value and a clause. You define the behavior of $visitor. $parts is an array of clause names. I suggest passing array('where') into this param.
My workaround is that I store the conditions in json string format.
Using the same example, what I do is
$data['conditions'] = json_encode(['Articles.id' => 1]); // encode into JSON string
$this->DynamicRules->patchEntity($dynamicRule, $data); // use in edit action of DynamicRulesController
then when I need to reuse the conditions, I do:
$articlesTable = TableRegistry::get('Articles');
$query = $articlesTable->find(); // new query for Articles
$rule = json_decode($dynamicRule->conditions, true); // get back the conditions in associative array format
$query->where($rule); // re-assign the conditions back
This got me what I ultimately wanted.
In zend framework 1, we had used mysql rand() function like below or using zend_db_expr(). I have tried this in ZF2, but this is not working. Somebody please help me to use this in Zend Framework 2
$select = $this->db()->select()
->from('TABLE')
->order('RAND()');
Thanks,
Looking at the API it appears that the order function accepts a string or array of parameters order(string | array $order). My first thought was to use a key/val array. However, as I look at the actual code of the Db\Sql\Select, the string or array that you are passing gets quoted (see here). Assuming that your Db platform is Mysql, this is the function that quotes the fields (see here). It appears to iterate through each of the fields, and add these quotes, rendering your rand() function a useless string.
Getting to the point, the solution is up to you, but it does not appear that you can do it the way you want with this current version of ZF2.
You will need to extend the Db\Sql\Select class, OR extend the Db\Adapter\Platform\Mysql class, OR change the code in these classes, OR execute your query as a full select statement, OR change up your logic.
By changing up your logic I mean, for example, if your table has an Integer primary key, then first select the MAX(id) from the table. Then, choose your random numbers in PHP prior to executing your query like $ids[] = rand(1, $max) for as many results as you need back. Then your sql logic would look like SELECT * FROM table WHERE id IN(453, 234, 987, 12, 999). Same result, just different logic. Mysql's rand() is very "expensive" anyways.
Hope this helps!
Here you can use \Zend\Db\Sql\Expression. Example function from ModelTable:
public function getRandUsers($limit = 1){
$limit = (int)$limit;
$resultSet = $this->tableGateway->select(function(Select $select) use ($limit){
$select->where(array('role' => array(6,7), 'status' => 1));
$rand = new \Zend\Db\Sql\Expression('RAND()');
$select->order($rand);
$select->limit($limit);
//echo $select->getSqlString();
});
return $resultSet;
}
If I have a statement that I know will return only one result:
$emp_query = "SELECT * FROM table WHERE id = 'employee_id' LIMIT 1"
Is there any way I can access the result of pg_query($con, $csr_query); as an associative array without using a pg_fetch_assoc and a while loop? A while loop seems unnecessary when I know I'm retrieving only one record. Maybe there is some way in PDO as well, I'm just setting it up this way first because I'm more comfortable with the simple way. Thanks.
Something like pg_fetch_result:
http://www.php.net/manual/en/function.pg-fetch-result.php