I'm using the new gcloud-java API (https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-datastore/src/main/java/com/google/cloud/datastore) for working with the Cloud Datastore. My specific question is on using GQL for pagination with cursors. I was able to page through the results one page at a time in the forward direction using cursors, but not having any luck with paging backwards.
Example Scenario:
Let's say I've 20 entities in a Kind with IDs 1 through 20. I have a page size of 5. Once I'm on the 3rd page (IDs 11 through 15), if I need to go one page back; i.e. retrieve IDs 6 through 10, what would be the correct GQL/sample code? Again, I prefer not to use offset with a number, but would like to use Cursors.
From what I can tell (actually tested), it looks like one needs to keep track of Start/End cursors for each page as they navigate in the forward direction, then use the saved cursors when there is a need to go back. I just want to make sure if this is the correct/only way or there is a simpler way to accomplish this.
Thanks in advance for your help.
If you add to your original query a sort by key (appended to the end of your "order by" clause), you should be able to reverse each property's sort order and use the latest cursor from your original query to get results in reverse.
Suppose you've iterated through some of the values from your forward query's QueryResults. You can call QueryResults's cursorAfter() method, which will return a cursor pointing right after the last result you saw from your original query. Now you can issue a new query (with the opposite sort order on each property, including the key property) using that cursor as the start cursor. You'll probably want to skip the first result, since it will be the last result you saw from the original query.
I would really like to understand how to use the "count" property of the IconTabFilter for SAPUI5 to dynamically show the count of the result set of a table.
I have the following code -
<IconTabFilter
count="{DataSet/$count}">
<Table items="{DataSet}">
But the count is not filled automatically.
I am using an oData model that is bound on the view level. I do not want to make another backend request just for the counts. What am I doing wrong here? Is there a different mechanism that can be used?
I also tried using the updateFinished event on the table to then get the count and set it via JS but the event is triggered only on DOM placement of the table. In my case the table is hidden behind the IconTab and is not placed into the DOM till the first time the user clicks the tab so its useless.
Really would appreciate some insight into how to use this!
Thanks!
Okay, so what I did was I bound my information to a local model and did an oData $expand query to fetch the entire pages information in one call.
This worked out for me because I had several sets of data to be fetched. Before they were bound individually to tables, now they are all in one query.
In the .done() method of the call I just used the setCount method of the IconTabFilter to set the count as per the return data set.
I have a requirement to filter the tree similar to that of flex builder-->preferences wizard tree.
My tree dataprovider is arraycollection of industries. Each industry has a list of sub industries and further, say upto depth 5.
So when we type in a string to filter, only the node having this string along with their parent hierarchy should be returned.
How can we implement this using flex?
I would write more but I think this link is all that's needed, essentially what it comes down to is you can use a filterFunction that's able to recursively act on the collection. If you need more direction please specify where you're stuck and what your original data set looks like.
http://www.kalengibbons.com/blog/index.php/2009/01/filtering-a-flex-tree-using-an-arraycollection/
Ok so I have drop down list connected to a datasource, and I need to change 2 or 3 of the values before they are displayed and I'm just having trouble figuring out what to do. I'm assuming I setup some kind of loop to check the values, but thats all I can figure. Does anybody have any general suggestions or resources they know that I can look up? Thanks.
You need to do your processing before you bind the datasource. So for example, create a dataset of results or arraylist, process the results changing your values and then bind to your dataset/arraylist.
You'll need to be more specific about what you are binding to and how you want to process for me to be more specific..
See link at http://www.c-sharpcorner.com/uploadfile/sd_patel/dropdownlistbox11222005064123am/dropdownlistbox.aspx
I have two views that I would like to combine into one.
The first view shows all items of X where company ID = Y. This is to give preferential sort to the client first, and then everyone else.
So I created a second view, all items of X, where company ID != Y.
I created it as an Attachment to attach to the first view, but I don't think I got the intended result.
How can I combine these views so the first view results are listed first, and then the second view is too, using the same pager, filters, and arguments?
Is there any way of achieving this without programming it?
From a MySQL point of view, the order-by-field syntax would be the appropriate way to handle this. Example:
SELECT * FROM tickets ORDER BY FIELD(priority, 'High', 'Normal', 'Low');
It would be great if there is a module that add this kind of functionality to Views, but AFAIK, it does not exist.
If you want to solve this without programming, I think you can use the rules module to automatically set the 'sticky' checkbox on nodes where company ID = Y. With that in place, you can order the View on the sticky value.
Along the lines of the 'sticky' idea, if you didn't want to override that, maybe you could add a checkbox field to the company type -- isClient. Make it false for everyone except the client, and sort by that.
I haven't done this, but maybe you need to create both versions as attachments, and attach them both to another display...?
for drupal 5 there was views union. Someone started something for D6, but I don't know how far they got.
http://drupal.org/node/275162
Create the second view as an attachment and attach it to first.
Set all Inherit arguments, Inherit exposed filters and Inherit pager to Yes.
how is the client parameter passed to the view? as an url argument? if so, you can create your second view like i outline here and then select the exclude the argument option on the appropriate location.
usually the easiest way to achieve this is with a small hook_query_alter, but that requires a small amount of programming.
A little bit later... but I've found a better solution using only the Views module:
Create a Block View with that shows the first list that you need ("all items of X where company ID = Y")
Create another View that must be a "Page view" with the second list (all items of X, where company ID != Y)
In the "HEADER" settings of this second view, click "Add" and select "Global: View area".
In the "View to insert" list, select the first you have created (and check "Inherid contextual filters" if you are using it)
And that's it!