I'm fetching data from database. I'm saving my data in string format like this
23,32
while fetching data from database my output is like
[{"transaction_id":"28,34"}]
but i want the out put in this format
[{"transaction_id":"28"},{"transaction_id":"34"}]
I'm not able to find the proper solution
You might want to mutate the data you're getting back with access mutator like:
public function getTransactionIdAttribute()
{
return //logic you want to apply to $this->transaction_id
}
But I suspect what you actually should do is set up your database relationship as many-to-many and make a join table that holds your transaction ids.
Related
I'm developing an application in Quasar/Electron and using Dexie/IndexedDB for my database. I want to find all distinct records in the database that contain both my Event ID and a Dog ID (both key indexed fields). I am able to do this with the following code:
await myDB.runTable
.orderBy('[fk_event+fk_dog]')
.eachUniqueKey((theDuo) => {
this.runsArray.push({eventID: theDuo[0], dogID: theDuo[1]})
})
I'm using a combined key which is working well. However, I need to have more of the records than just the keys. I need a few more fields, is this possible?
I was trying to get records with the unique key function while also using the where function, but that doesn't seem to work.
I need to get all the unique (distinct?) dogs in the table that are in a particular event. And also get their corresponding information. I'm not sure if there is a better, more efficient way to do this? I can always pull out all the records and loop through them to build a custom array, I was just hoping to do this at the table read level. (yeah I'm still in tables/records even though these are collections etc. :p ).
Even the above code gives me all the events, and I can pull out what I need with a filter. I just was thinking it would be faster and more efficient to do it at the read level.
this.enteredRuns = this.runsArray.filter((theEvent) => {
return ( (theEvent.eventID == this.currentEventID) )
})
Try
await myDB.runTable
.orderBy('[fk_event+fk_dog]')
.clone({unique: "unique"})
.toArray()
I know this isn't documented but it should do the work to use unique cursor while still extracting the whole objects and not just the keys. You cannot combine with where but you could use .filter. Just be aware that not all records with be scanned as it will jump over records with same keys - selecting the first visited records only.
I have the following Core Data Model:
User has attributes username(string) and user_id(integer).
ContactStatus has first_user_id(integer), second_user_id(integer), and status(string which is either "1REQ","2REQ", or "CONF").
I want to get a list of contacts for a given user with a user_id of u_id, the equivalent SQL would be:
SELECT first_user_id,second_user_id FROM ContactStatuses WHERE (first_user_id == u_id OR second_user_id == u_id) AND status == 'CONF'
Or is there a better way to organize my data in Core Data? This is the way its organized in my MySQL database.
Edit:
I have a MySQL database on my server, and in php/sql, if I wanted to return a list of a user's contacts, I would use the above query. As I download this information (in JSON) to my iOS app, I would like to store these users' information in the managed object context. Then, when I want to display a list of contacts to the users, I would want to query the managed object context with a fetch request similar to the above SQL statement. The problem is that I don't know how to filter users with a predicate that comes from a different entity, the contactstatus entity.
CoreData is an object graph representation of your data, in most cases it is backed up by an SQLite database.
I assume that you need to sync your objects with a server side database and so you must define your own user_id property.
However, it might make sense for you to make a relationship between a User entity and a ContactStatus entity (this depend on your implementation and application needs that you have not listed).
In any case, under your current implementation (assuming your query target entity is ContactStatus).
Your predicate should look something like:
[NSPredicate predicateWithFormat:#"(first_user_id = %# OR second_user_id) AND status = %#",#(u_id),#(u_id),#"CONF"];
consider the following code:
function getPersonById(personId, type) {
var p1 = new breeze.Predicate("Id", "==", personId);
var p2 = new breeze.Predicate("Type", "==", type);
var query = breeze.EntityQuery.from("Contacts").where(p1.and(p2))
if (!manager.metadataStore.hasMetadataFor(service.serviceName)) {
return manager.fetchMetadata().then(function () {
return manager.executeQuery(query.using(service));
});
} else {
var fromCache = manager.getEntityByKey('Contact', personId);
if (fromCache)
return Q.resolve(fromCache);
return manager.executeQuery(query.using(service));
}
}
Am I doing things the right way ? It seems to me that I have to write a lot of boiler-plate code just for fetching an entity. I had to make sure the metadata was known, and then if the entity is already in cache or not.
I'm facing an issue because if executeQuery is called, then the return value is an array. However if getEntityByKey is called, then the return value is an Entity. How can I deal with that in an elegant way ? Is there a way to force executeQuery to return a single Entity rather than an array ? (I'm expecting only one returned value anyway)
Your metadata test shouldn't be necessary for each query. If you add a fail method that handles any errors (such as no metadata) you can write that only once, but in reality if whatever service type JavaScript file you are using is loaded metadata should always be there. If you are moving datacalls to the view models then I would recommend rethinking that strategy.
the way you are doing your cache check is optional. Remember that there are two ways to query from cache - executeQueryLocally and setting the fetchStrategy. There are some instances where you will want to go refresh data from the server so I would definitely recommend trying to pull from cache first in each query and only going to the database on a needed basis. Generally I only have two methods for all my data retrieval, for each entity, although if you are tricky you can probably reduce that to sharing queries as well. Your queries are most efficient when you can reuse them for different orderBy's, where clauses, etc...
Last, if you want to return only a single entity just do it lklike you would any other array - catch the returned array results before sending them back and filter it down to something like data.results[0]. You could also query and then use a filter to find the first entity that meets sine criteria.
If you create a checkbox list in symfony 1.2 you get an array with the checked options back in the form. If you save the form, your database now contains the words "Array". Is there a way around this? Or should I just json_encode / json_decode the array as ncecessary and save it manually? Seems awfully tedious.
Thanks for reading.
You can use serialize() and unserialize() functions when saving and getting data.
I don't know which orm using but i can explain with propel way.
For example you have post table and Post class. And post table has options column with text or varchar data type.
in Post.class.php your model directory you can define two override methods
setOptions($v)
{
parent::setOptions(serialize($v));
}
getOptions()
{
return unserialize($this->options);
}
Just like that.
In your view or action you can get all options with $post->getOptions() and you have an Array that contains all option related to your database record.
I want to include a table (Events) from another database in my LINQ to SQL class.
How should I format the Data Source of that table?
I have tried with IP.dbo.Events, IP.DatabaseName.dbo.Events and so on, but can not get it to work.
The reason for all this is to select Events that a Client have attended.
I have also tried to have the table in another LINQ to SQL class, but then it complains on the Data Context.
public static IQueryable<Event> ByClientID(this IQueryable<Event> events, int clientID)
{
events = from e in events
from c in new MyDataContext().ClientCourses
where e.EventID == c.CourseID &&
c.ClientID == clientID
select e;
return events;
}
You can only use tables that reside on the same physical SQL Server in two different instances. I did this once as someone had "cleverly" put an application's DB across two database instances.
There is a blog post on it here that may help.
Could you create a view that returns the data from the 2nd database and use this instead? (Not tried this so absolutely no idea if it'll work :)
Obviously this is no good if you need to be saving to the other database too..