Databases
StackOverflow2013
Postsdbo
PO
 

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    <p>There could be many reasons for your failure to display the records: </p> <ul> <li>data was not saved</li> <li>data was not retrieved correctly</li> <li>data was not displayed correctly</li> </ul> <p>All of these could be potentially complicated scenarios, but you should check them in this order. </p> <p>A much better approach: use <code>NSFetchedResultsController</code> for your main view controller and have the delegate methods take care of updating your table view. No need to fetch, no work to be done in any completion methods - just save the data and the FRC will update your table.</p> <p><strong>Edit: how to check the physical database</strong><br> It is possible that your data only exists in memory but is not actually saved to the database. Find the actual database file (in the documents folder of the app from the Simulator) and check it with the <code>sqlite3</code> command line utility, or with the Firefox plugin "SQLite Manager".</p> <p><strong>Edit2: more concrete recommendations</strong><br> You should make sure that you call:</p> <pre><code>[managedObjectContext save:&amp;error]; </code></pre> <p>Also double-check what your <code>ENTITY</code> macro stands for (not a very smart name).</p> <p>It seems to me that you are overusing the block methods to no apparent purpose. First try to make everything work on the main thread (one context!). Only if you get performance problems consider background threads and context and calls to <code>performBlock</code> etc.</p>
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    1. This table or related slice is empty.
    1. POCoreData gets emptied after adding data into it
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    1. USMundi
    1. USMundi
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. CO1. Data was saved, as I have already told that I am fetching the data in `dissmissViewControllerAnimated` and it is displaying. But later that when I fetch the data, it returns the empty data. 2. When I am retrieving the data, I am setting predicate to `nil` so that all the data can be fetched. But that comes to be empty. 3. There is no point of 'not displaying correctly' because I am checking data via `NSLog`, not via any tableView Also, I need the data to draw a graph thats why I can't use NSFetchResultsController.
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      1. USnefarianblack
    2. COBest way to check if your data is really existing in coredata is to check the DB itself. It might be that the data you have are only "TempData"
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      1. USJoshua
    3. COHow to go about check the Database itself?
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      1. USnefarianblack
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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