Is there a way to update a row directly with and ID? I just want the ability to update a table row field without querying for the object first. I tried this...
$id = 1;
$s = new Sandbox();
$s->setId($id);
$s->setFname('moon');
$e = $em->merge($s);
$em->flush($e);
and it tried to do an update to the database, however, it failed because it tried to update all the undefined fields as well whereas I just want to update the fname field.
Thanks
$id = 1;
$s = $em->getReference('Sandbox', $id);
$s->setFname('moon');
$em->persist($s);
$em->flush($s);
Related
Hello i want to update a single value on another table using laravel. This is the code i have done until now but doesnt seem to work:
$amount = Product::findorFail($request->products[$i]);
$total_value = $request->amount[$i] + $amount->amount;
$amount->update(['amount', $total_value]);
dd($total_value);
with dd i see that the result is correct but the update function is not, the query im trying to make is
update table set amount=x where id=y
You have multiple choices. The shortes are:
$amount->update(['amount'=> $amount->amount + request->amount[$i]]);
or
Product::findorFail($request->products[$i])->increment('amount', $request->amount[$i]);
you could change your code like below
$amount = Product::findorFail($request->products[$i]);
$total_value = $request->amount[$i] + $amount->amount;
$amount->amount=$total_value;
$amount->update();
or as mentioned in comments you could use eloquent increment function
I am trying to execute a query using eloquent, however it returns me an array. What I want is to only get the string value of my query.
This is what I get
[{"name":"hey"}] [{"name":"sdasdasd"}]
Here's my eloquent query:
$categoryName = Category::select('name')->where('id', request('category'))->get();
$subCategory = Subcategory::select('name')->where('id', request('subCat'))->get();
as per the Laravel Docs
Retrieving A Single Row / Column From A Table
If you just need to retrieve a single row from the database table, you may use the first method. This method will return a single stdClass object:
$user = DB::table('users')->where('name', 'John')->first();
echo $user->name;
If you don't even need an entire row, you may extract a single value from a record using the value method. This method will return the value of the column directly:
$email = DB::table('users')->where('name', 'John')->value('email');
so in your example maybe you need to do something like the following :
$subCategory = Subcategory::select('name')->where('id', request('subCat'))-> first();
echo $subCategory->name;
There are so many ways to achive your goal.
Solutions
Use pluck().
$categoryName = Category::select('name')
->where('id', request('category'))
->pluck()
->first();
Use model properties.
$categoryName = Category::find(request('category'))
->name;
If you take only name then follow the below code.
$categoryName = Category::where('id', request('category'))->first()->name;
$subCategory = Subcategory::where('id', request('subCat'))->first()->name;
echo $categoryName;
echo $subCategory;
If you take all columns in a row follow the below code:
$categoryName = Category::where('id', request('category'))->first();
$subCategory = Subcategory::where('id', request('subCat'))->first();
echo $subCategory->name;
echo $categoryName->name;
I hope this i may help you.Try this.
You can get the answer using
$name = DB::table('Category')->where('id','=',request('category'))->pluck('name')->first();
echo $name;
$name = Category::select('name')->where('id', request('category'))->take(1)->orderBy('id','asc')->first()->name;
echo $name;
OR
echo Category::select('name')->where('id', request('category'))->take(1)->orderBy('id','asc')->first()->name;
Right to the point.
I need to update a field in the database using the field to calculate the new value first.
E.g of fields: https://i.stack.imgur.com/FADH6.jpg
Now I am using the Joomla updateObject function. my goal is to take the "spent" value from the DB table without using a select statement.
Then I need to calculate a new value with it like (spent + 10.00) and update the field with the new value. Check out the code below:
// Create an object for the record we are going to update.
$object = new stdClass();
// Must be a valid primary key value.
$object->catid = $item['category'];
$object->spent = ($object->spent - $item['total']);
// Update their details in the users table using id as the primary key.
$result = JFactory::getDbo()->updateObject('#__mytable', $object, 'catid');
The bit which i need to make the calculation on is
$object->spent = ($object->spent - $item['total']);
I realise I can use a seperate insert statement but I am wondering if there is a better way. Any help is much appreciated.
It needs to work like this, WITHOUT THE SELECT (working example)
$query = $db->getQuery(true);
$query->select($db->quoteName('spent'));
$query->from($db->quoteName('#__mytable'));
$query->where($db->quoteName('catid')." = ". $item['category']);
// Reset the query using our newly populated query object.
$db->setQuery($query);
$oldspent = $db->loadResult();
// Create an object for the record we are going to update.
$object = new stdClass();
// Must be a valid primary key value.
$object->catid = $item['category'];
$object->spent = ($oldspent - $item['total']);
// Update their details in the users table using id as the primary key.
$result = JFactory::getDbo()->updateObject('#__mytable', $object, 'catid');
The sticking point with trying to use updateObject('#__mytable', $object, 'catid'); is that your query logic needs to reference the column name in the calculation to assign the "difference" as the new value. The raw mysql query syntax to update a column value with the value minus another value is like:
"`spent` = `spent` - {$item['total']}"
updateObject() will convert spent - {$item['total']} to a literal string, the database will expect a numeric value, so UPDATE results in a 0 value recorded. In other words, $db->getAffectedRows() will give you a positive count and there will be no errors generated, but you don't get the desired mathematical action.
The workaround is to discard updateObject() as a tool and build an UPDATE query without objects -- don't worry it's not too convoluted. I'll build in some diagnostics and failure checking, but you can remove whatever parts that you wish.
I have tested the following code to be successful on my localhost:
$db = JFactory::getDBO();
try {
$query = $db->getQuery(true)
->update($db->quoteName('#__mytable'))
->set($db->quoteName("price") . " = " . $db->qn("price") . " - " . (int)$item['total'])
->where($db->quoteName("catid") . " = " . (int)$item['category']);
echo $query->dump(); // see the generated query (but don't show to public)
$db->setQuery($query);
$db->execute();
if ($affrows = $db->getAffectedRows()) {
JFactory::getApplication()->enqueueMessage("Updated. Affected Rows: $affrows", 'success');
} else {
JFactory::getApplication()->enqueueMessage("Logic Error", 'error');
}
} catch (Exception $e) {
JFactory::getApplication()->enqueueMessage("Query Syntax Error: " . $e->getMessage(), 'error'); // never show getMessage() to public
}
Here is a StackOverflow page discussing the mysql subtraction logic: update a column by subtracting a value
I am developing a php project using Laravel 5.2. In my app I am retrieving records from database using manual query. But I am having a problem with retrieving records by using where in statement with csv.
Example how I am retrieving
$csv = "1,3,5";
$sql = "SELECT * FROM `items` WHERE `id` IN (?)";
$rows = DB::select($sql,[$csv]);
As you can see above I am retrieving three rows. But it returns only one row where id is 1. Why is that?
You can't do it like that. Each entry in your csv is a separate parameter, so for your code you would actually need IN (?, ?, ?), and then pass in the array of values. It would be pretty easy to write the code to do this (explode the string to an array, create another array of question marks the same size, put it all together).
However, you are using Laravel, so it would be easier to use the functionality Laravel provides to you.
Using the query builder, you can do this like:
$csv = "1,3,5";
// turn your csv into an array
$ids = explode(",", $csv);
// get the data
$rows = DB::table('items')->whereIn('id', $ids)->get();
// $rows will be an array of stdClass objects containing your results
dd($rows);
Or, if you have an Item model setup for your items table, you could do:
$items = Item::whereIn('id', $params)->get();
// $items will be a Collection of Item objects
dd($items);
Or, assuming id is the primary key of your items table:
// find can take a single id, or an array of ids
$items = Item::find($params);
// $items will be a Collection of Item objects
dd($items);
Edit
If you really want to do it the manual way, you could use a loop, but you don't need to. PHP provides some pretty convenient array methods.
$csv = "1,3,5";
// turn your csv into an array
$ids = explode(",", $csv);
// generate the number of parameters you need
$markers = array_fill(0, count($ids), '?');
// write your sql
$sql = "SELECT * FROM `items` WHERE `id` IN (".implode(',', $markers).")";
// get your data
$rows = DB::select($sql, $ids);
4 for on on my applications with Doctrine.
In there I'm using the following doctrine command to retrieve person object collection
//query
$people = $q->execute();
This return 20 objects. The primary key of the person object is a composite key with three attributes. Those are
id
department_id
name
I need to get person objects by searching in it as follows.
$id = 10;
$department_id = 1;
$name = "abc";
$people->get($id, $department_id, $name);
But this doesn't work and not give correct results. I tried with this and it gives null results which seems my collections primary key is not set.
$people->getKeyColumn();
I don't want to go through a foreach loop in collection and process it because when I deal with about 500 people, it slow down my application.
Can some one help me with this issue to get values from a doctrine collection.
Can you use something like this?
$people = Doctrine::getTable('Persons')
->createQuery()
->where('id = ? AND department_id = ? AND name = ?', array($id, $department_id, $name))
->execute();
It will get you a DoctrineCollection already filtered by the parameters provided.
'Persons' here is a Doctrine model name, not a table name from mySQL.
You can also use Doctrine's magic finders findBy*():
$people = Doctrine_Core::getTable('Persons')
->findByIdAndDepartmentIdAndName($id, $department_id, $name);