I am looking for a way to return the value of a precise column in the first result of a query.
The query result contains always 1 row containing the following columns :
ID
PW
RANK
I am trying to only get the rank value in order to push it into a session variable.
I tried messing with :
$row-> $query->row();
But then I don't know how to get only the value of the rank column. Ideally, I would want to get that value, then return it to allow my controller to set it in the session variable ( doing it in the model would be easier but would break the MVC pattern, right ?)
How can I do this ?
Thanks
Have the controller call a function in the model that return that value. Let's say the model has a function name get_rank()
public function get_rank($id)
{
// assumes your ID is an int
$id = (int)$id;
// avoid wasting a query
if ($id < 1) return FALSE;
// build query
$this->db->select('rank');
$this->db->from('YOUR_TABLE');
$this->db->where('id', $id);
// maybe some sorting / limiting here if you need it
// get result
$rs = $this->db->get();
if ($rs->num_rows() > 0)
{
// just get the first row
$row = $rs->row();
return $row->rank;
}
return FALSE;
}
Related
when i query a single table , i do not want all columns , i just want some column that i interest in.
For example, when i use where method to query a table, it will query all columns in a table like
public class SubjectSpecimenType extends Model {
}
SubjectSpecimenType.where("SUBJECT_ID = ? AND SITE_ID = ?", subjectId, siteId);
i don't know if there has a method named select that i can use to query some column like
SubjectSpecimenType.select("SUBJECT_NAME", "SITE_NAME").where("SUBJECT_ID = ? AND SITE_ID = ?", subjectId, siteId);
there are the source code in LazyList.java
/**
* Use to see what SQL will be sent to the database.
*
* #param showParameters true to see parameter values, false not to.
* #return SQL in a dialect for current connection which will be used if you start querying this
* list.
*/
public String toSql(boolean showParameters) {
String sql;
if(forPaginator){
sql = metaModel.getDialect().formSelect(null, null, fullQuery, orderBys, limit, offset);
}else{
sql = fullQuery != null ? fullQuery
: metaModel.getDialect().formSelect(metaModel.getTableName(), null, subQuery, orderBys, limit, offset);
}
if (showParameters) {
StringBuilder sb = new StringBuilder(sql).append(", with parameters: ");
join(sb, params, ", ");
sql = sb.toString();
}
return sql;
}
when call formSelect method, the second param columns always be null
is there a unfinish TODO ?
When operating on Models, ActiveJDBC always selects all columns, because if you load a model and it has partial attributes loaded, then you have a deficient model. The columns are specified in some edge cases, as in the RawPaginator: https://github.com/javalite/javalite/blob/e91ebdd1e4958bc0965d7ee99e6b7debc59a7b85/activejdbc/src/main/java/org/javalite/activejdbc/RawPaginator.java#L141
There is nothing to finish here, the behavior is intentional.
So I have a standard service reference proxy calss for MS CRM 2013 (i.e. right-click add reference etc...) I then found the limitation that CRM data calls limit to 50 results and I wanted to get the full list of results. I found two methods, one looks more correct, but doesn't seem to work. I was wondering why it didn't and/or if there was something I'm doing incorrectly.
Basic setup and process
crmService = new CrmServiceReference.MyContext(new Uri(crmWebServicesUrl));
crmService.Credentials = System.Net.CredentialCache.DefaultCredentials;
var accountAnnotations = crmService.AccountSet.Where(a => a.AccountNumber = accountNumber).Select(a => a.Account_Annotation).FirstOrDefault();
Using Continuation (something I want to work, but looks like it doesn't)
while (accountAnnotations.Continuation != null)
{
accountAnnotations.Load(crmService.Execute<Annotation>(accountAnnotations.Continuation.NextLinkUri));
}
using that method .Continuation is always null and accountAnnotations.Count is always 50 (but there are more than 50 records)
After struggling with .Continutation for a while I've come up with the following alternative method (but it seems "not good")
var accountAnnotationData = accountAnnotations.ToList();
var accountAnnotationFinal = accountAnnotations.ToList();
var index = 1;
while (accountAnnotationData.Count == 50)
{
accountAnnotationData = (from a in crmService.AnnotationSet
where a.ObjectId.Id == accountAnnotationData.First().ObjectId.Id
select a).Skip(50 * index).ToList();
accountAnnotationFinal = accountAnnotationFinal.Union(accountAnnotationData).ToList();
index++;
}
So the second method seems to work, but for any number of reasons it doesn't seem like the best. Is there a reason .Continuation is always null? Is there some setup step I'm missing or some nice way to do this?
The way to get the records from CRM is to use paging here is an example with a query expression but you can also use fetchXML if you want
// Query using the paging cookie.
// Define the paging attributes.
// The number of records per page to retrieve.
int fetchCount = 3;
// Initialize the page number.
int pageNumber = 1;
// Initialize the number of records.
int recordCount = 0;
// Define the condition expression for retrieving records.
ConditionExpression pagecondition = new ConditionExpression();
pagecondition.AttributeName = "address1_stateorprovince";
pagecondition.Operator = ConditionOperator.Equal;
pagecondition.Values.Add("WA");
// Define the order expression to retrieve the records.
OrderExpression order = new OrderExpression();
order.AttributeName = "name";
order.OrderType = OrderType.Ascending;
// Create the query expression and add condition.
QueryExpression pagequery = new QueryExpression();
pagequery.EntityName = "account";
pagequery.Criteria.AddCondition(pagecondition);
pagequery.Orders.Add(order);
pagequery.ColumnSet.AddColumns("name", "address1_stateorprovince", "emailaddress1", "accountid");
// Assign the pageinfo properties to the query expression.
pagequery.PageInfo = new PagingInfo();
pagequery.PageInfo.Count = fetchCount;
pagequery.PageInfo.PageNumber = pageNumber;
// The current paging cookie. When retrieving the first page,
// pagingCookie should be null.
pagequery.PageInfo.PagingCookie = null;
Console.WriteLine("#\tAccount Name\t\t\tEmail Address");while (true)
{
// Retrieve the page.
EntityCollection results = _serviceProxy.RetrieveMultiple(pagequery);
if (results.Entities != null)
{
// Retrieve all records from the result set.
foreach (Account acct in results.Entities)
{
Console.WriteLine("{0}.\t{1}\t\t{2}",
++recordCount,
acct.EMailAddress1,
acct.Name);
}
}
// Check for more records, if it returns true.
if (results.MoreRecords)
{
// Increment the page number to retrieve the next page.
pagequery.PageInfo.PageNumber++;
// Set the paging cookie to the paging cookie returned from current results.
pagequery.PageInfo.PagingCookie = results.PagingCookie;
}
else
{
// If no more records are in the result nodes, exit the loop.
break;
}
}
I have a situation where my user is presented with a grid, and it, by default, will just get the first 15 results. However they may type in a name and search for an item across all pages.
Alone, either of these works fine, but I am trying to figure out how to make them work as a single query. This is basically what it looks like...
// find a filter if the user is searching
var filters = request.Filters.ToFilters();
// determine the name to search by
var name = filters.Count > 0 ? filters[0] : null;
// we need to be able to catch some query statistics to make sure that the
// grid view is complete and accurate
RavenQueryStatistics statistics;
// try to query the items listing as quickly as we can, getting only the
// page we want out of it
var items = RavenSession
.Query<Models.Items.Item>()
.Statistics(out statistics) // output our query statistics
.Search(n => n.Name, name)
.Skip((request.Page - 1) * request.PageSize)
.Take(request.PageSize)
.ToArray();
// we need to store the total results so that we can keep the grid up to date
var totalResults = statistics.TotalResults;
return Json(new { data = items, total = totalResults }, JsonRequestBehavior.AllowGet);
The problem is that if no name is given, it does not return anything; Which is not the desired result. (Searching by 'null' doesn't work, obviously.)
Do something like this:
var q= RavenSession
.Query<Models.Items.Item>()
.Statistics(out statistics); // output our query statistics
if(string.IsNullOrEmpty(name) == false)
q = q.Search(n => n.Name, name);
var items = q.Skip((request.Page - 1) * request.PageSize)
.Take(request.PageSize)
.ToArray();
Understanding Magento Models by reference of SQL:
select * from user_devices where user_id = 1
select * from user_devices where device_id = 3
How could I perform the same using my magento models? getModel("module/userdevice")
Also, how can I find the number of rows for each query
Following questions have been answered in this thread.
How to perform a where clause ?
How to retrieve the size of the result set ?
How to retrieve the first item in the result set ?
How to paginate the result set ? (limit)
How to name the model ?
You are referring to Collections
Some references for you:
http://www.magentocommerce.com/knowledge-base/entry/magento-for-dev-part-5-magento-models-and-orm-basics
http://alanstorm.com/magento_collections
http://www.magentocommerce.com/wiki/1_-_installation_and_configuration/using_collections_in_magento
lib/varien/data/collection/db.php and lib/varien/data/collection.php
So, assuming your module is set up correctly, you would use a collection to retrieve multiple objects of your model type.
Syntax for this is:
$yourCollection = Mage::getModel('module/userdevice')->getCollection()
Magento has provided some great features for developers to use with collections. So your example above is very simple to achieve:
$yourCollection = Mage::getModel('module/userdevice')->getCollection()
->addFieldToFilter('user_id', 1)
->addFieldToFilter('device_id', 3);
You can get the number of objects returned:
$yourCollection->count() or simply count($yourCollection)
EDIT
To answer the question posed in the comment: "what If I do not require a collection but rather just a particular object"
This depends if you still require both conditions in the original question to be satisfied or if you know the id of the object you wish to load.
If you know the id of the object then simply:
Mage::getModel('module/userdevice')->load($objectId);
but if you wish to still load based on the two attributes:
user_id = 1
device_id = 3
then you would still use a collection but simply return the first object (assuming that only one object could only ever satisfy both conditions).
For reuse, wrap this logic in a method and place in your model:
public function loadByUserDevice($userId, $deviceId)
{
$collection = $this->getResourceCollection()
->addFieldToFilter('user_id', $userId)
->addFieldToFilter('device_id', $deviceId)
->setCurPage(1)
->setPageSize(1)
;
foreach ($collection as $obj) {
return $obj;
}
return false;
}
You would call this as follows:
$userId = 1;
$deviceId = 3;
Mage::getModel('module/userdevice')->loadByUserDevice($userId, $deviceId);
NOTE:
You could shorten the loadByUserDevice to the following, though you would not get the benefit of the false return value should no object be found:
public function loadByUserDevice($userId, $deviceId)
{
$collection = $this->getResourceCollection()
->addFieldToFilter('user_id', $userId)
->addFieldToFilter('device_id', $deviceId)
;
return $collection->getFirstItem();
}
I have a webservice I call from a WP7 app. I get a list of high scores in a table (name/score).. What is the simpliest way to add a 3rd column on the far left which is simply the row?
Do I need to add a property to the entity? Is there someway to get the row #?
I tried these things below with no success..
[OperationContract]
public List<DMHighScore> GetScores()
{
using (var db = new DMModelContainer())
{
// return db.DMHighScores.ToList();
var collOrderedHighScoreItem = (from o in db.DMHighScores
orderby o.UserScore ascending
select new
{
o.UserName,
o.UserScore
}).Take(20);
var collOrderedHighScoreItem2 = collOrderedHighScoreItem.AsEnumerable().Select((x, i) => new DMHighScoreDTO
{
UserName = x.UserName,
UserScore = x.UserScore
}).ToList();
}
}
[DataContract]
public class DMHighScoreDTO
{
int Rank;
string UserName;
string UserScore;
}
So lets assume you want to load top 100 users in leaderboard and you want to have their rank included:
[OperationContract]
public List<ScoreDto> GetTop100()
{
// Linq to entities query
var query = (from u from context.Users
order by u.Score
select new
{
u.Name,
u.Score
}).Take(100);
// Linq to objects query from working on 100 records loaded from DB
// Select with index doesn't work in linq to entities
var data = query.AsEnumerable().Select((x, i) => new ScoreDto
{
Rank = i + 1,
Name = x.Name,
Score = x.Score
}).ToList();
return data;
}
what will the row number be used for? if this is for ordering might I suggest adding a column named Order, then map the column to your entity.
if you require a row index, you could also call the .ToList() on the query and fetch the index locations for each entity.
Edit:
you could add the Rank property and set it to Ignore. This will enable you to go through the collection set the rank with a simple for loop. This will also not be persisted in the database. It will also not have any required columns in the database.
It does add an extra iteration.
the other way to go about it. This would be to add the rank number in the generated UI and not in the data collection being used to bind.