Android :: Prematurely Stop A Long-running SQLite Query
Sep 26, 2009
How to programmatically stop a long-running query?
The long-running step is, for example, the first call to Cursor.moveToFirst(). This can sometimes take up to 30 seconds so I would like the user to be able to cancel.
However, how should this be done? I've tried closing the Cursor (in another thread) but all that happens is that the close() call takes as long as moveToFirst() and then terminates with the exception:
java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable
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Sep 29, 2010
I want to run this query in Android Application :
code:.......
My DB schema
code:..........
Here is the function -
code:...........
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Sep 24, 2010
I create a table like that
CODE:...........
I update it this way
CODE:..........
I do see the change in eclipse with DDMS questoid
But when i try to retrieve the value I get nothing ....
CODE:.........
I've tried some variant like
CODE:............
With no success
Is this problem come from the type (integer) of my column ?
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Aug 7, 2009
I use this query in my android database, but It return no data. Am I missing something?
CODE:................
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Jun 2, 2010
I successfully created the Database and inserted a row however I cannot Query it for some reason. My Droid crashes everytime.
CODE:...........
I get this exception
No such column: value: , while compiling: SELECT DISTINCT value FROM mainTable
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Jul 17, 2010
I have a query that pulls everything from a database into a list view.
code:..........
I want only the records where the field KEY_HOMEID matches a variable called journalId which should be a numeric string.
I would also like to know how to bring the variable into my DatabaseAdapter... would ((resource)this.getApplication()).getjournalId()) work? resource is a class that extends application.
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Oct 10, 2010
I am trying to write a select query from one single table in SQLite DB in my app where data exists.
This is the SQL.table has these columns - id(INTEGER), start_time(INTEGER), category(TEXT)
select category from tuuserid_pref where id = (select max(id) from tuuserid_pref
where start_time < '1242'); by the way I want to bind the value shown in 1242 which I have in an Integer variable.
I have written selects and inserts and updates without binding parameters and they work using db.execSQL and db.rawQuery functions but just cannot figure the binding parameters out.
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Mar 23, 2010
I have a query that selects rows in a ListView without having a limit. But now that i have implemented a SharedPreferences that the user can select how much rows will be displayed in the ListView, my SQLite query doesnt work. Im passing the argument this way:
CODE:...................
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May 15, 2010
I'm using the SQLite3 database system in the Android library. I need to execute a query during a transaction to see if there is a similar entry already there. If there is, I have to perform some other logic and adjustments before I add a new row. Can I execute a query within a transaction and get the result back immediately?
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Feb 16, 2009
Is there any way out to achieve "SELECT * FROM tblname WHERE name LIKE '%[0-9]%' ". i know we can't do this with sqlite~ but how to deal with such query task with sqlite? i tried to use REGEXP ~but unluckily it is not pre-defined~ so i tried to define it by myself...but even i couldn't find a way in android to create a UserDefinedFunction...
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Jul 29, 2010
Im trying to get an object form my SQLite database in my Android application. I know that the contact is in the database because when I add it and try finding by ID, it returns the object. When I try finding by first and last name, though, it throws an exception and Im left with a null reference.
Here is the query:
CODE:..........
Ive also tried to find just by first name and just by last name. Same result as above.
The exception is an SQLite exception
no such column: aurelius: , while compiling: SELECT _id, last_name, first_name,
email_address, organization_name, label, label_position FROM contacts WHERE
first_name=marcus AND last_name=aurelius
And also happens when trying to select just first or last name
no such column: marcus: , while compiling: SELECT _id, last_name, first_name,
email_address, organization_name, label, label_position FROM contacts WHERE
first_name=marcus
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May 13, 2009
I know db.query was written like below in Android sample. I want to use other field instead of rowId witch is KEY_DATE, but it's not worked as well.
CODE:.................
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Jun 19, 2010
Have been using a SQLite database, Theres a situation where i have a list which displays all the "name" field data of a table "table1". Now i have a button to insert data in "table1". The list is populated using a simple cursor adapter which is passed a cursor "cursor1" populated with the data. "cursor1" is prepared using the SQLite query - "SELECT * FROM table1". Now the moment i insert data, i need to update the list too.
My question is- will the Adapter sense the database change automatically (i guess not)?
using cursor1.requery() is correct or should i use cursor1 = db.query("table1", null, null, null, null, null, null);
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Jun 27, 2010
I have this query which does work fine in MySQL
CODE:............
Distance is in Kilometers, the input is lat=12.345 and lon=67.89
The SQLite is 3, and I can't run custom functions with it as it's on Android. I also don't have acos() etc... as that is not part of the standard SQLite.
How would be the above query in SQLite?
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May 18, 2010
I have a problem programming with android SDK 1.6. I'm doing the same things of the "notepad exaple" but the programm crash when i try some query. If i try to do a query directly in to the DatabaseHelper create() metod it goes, but out of this function it doesn't.
This is the source:
CODE:.................
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Sep 30, 2010
Am I going wrong anywhere here ? because this is giving runtime error. application stopped unexpectedly.
I may b wrong in syntax.
CODE:..................
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Nov 29, 2012
i want to run a delete query with limitation . I've tried to many queries but they didn't work . For know , I just want to remove all the rows and I write this code "
DELETE FROM tbl1 where _id IN(select _id from tbl1 WHERE cat=21)
The emulator runs perfectly without any error . right now , I have 32 rows with cat = 21 . solve this problem ?
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Jun 24, 2010
I've got a query, (I'm using rawQuery())
SELECT * FROM <table>
I'm then storing what it returns using a cursor. From their what I want to do is, start at the first row so.. cursor.moveToFirst() then take each column , column by column and store its particular value in a variable. I then want to move onto the next row and do the same. So I guess my question is How would I get cursor to deal with multiple columns?
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Aug 11, 2010
In my Android application user can fill database with imported data, then perform predefined, complex SQL query. With some data pattern, query will take very long (minutes and more on HTC Hero), while common usage will not exceed 10-15 seconds.
Is there any way to cancel pending SQLite query on Android? Timeout would be as good as well, partial results are not required. I'm performing query within AsyncTask.doInBackground()
I know best way is optimize query or change app logic, but in this case results depends on user knowledge anyway, so I'd like to help those who enter troublesome pattern.
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Mar 21, 2012
I've a problem with a query in sqlite3.
The query is very simple:
SELECT MAX (INIT_DATE) INIT_DATE FROM TABLE;
When my application execute this query, and the table is empty, a record is returned. I can't understand why a record is being returned if the table is empty. It should return cero results.
I've tried to execute the query in two different ways:
cursor = db.query(true, "TABLE", new String[] {"MAX(INIT_DATE) AS INIT_DATE"}, null, null, null, null, null, null);
cursor = db.rawQuery("SELECT MAX(INIT_DATE) AS INIT_DATE FROM TABLE", null);
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May 6, 2009
I want to store long value in database ( current time millis), how to store it.
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Aug 19, 2010
can we use truncate query in android database? otherwise can we performing truncate operation using our java code?
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Jul 27, 2010
I have an app that has a service with it. This service is started the first time you open the app is is suppose to run continuously in the background every two minutes. It seems that at some point though the service stops running or alarmManager stops scheduling/doing what is requested of it. Here is a breakdown of my code flow.
User opens the app,. Service is started, Inside the service I cancel any alarms that might be for this app then create a new one set for two minutes out, Once the alarm is set I call a GPS location check to get lat/lon, I then call up a .net web service to do some stuff with the lat/lon, Once text is returned I check that text for certain Items, If a certain item is found I send a broadcast out to a receiver that then creates a wakelock, starts a new intent to open an activity of my app then sounds an alarm, Right after I broadcast I call stopSelf() as well as calling stopSelf() if the text did not contain certain Items, I call finish() on the new activity I started if we go that far once the Active screen of my app is closed.
The reason I think something is dieing out here is because after some point in time usually once I wake up in the morning and check the phone I no longer see my GPS icon on my droid checking every two minutes.
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Nov 9, 2010
I am doing an application in android which requires to know for how long the application is running. Do anyone know how to retrieve such information??. Is there any way where android provides the information about the running applications ,from how much time they are running?
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Aug 28, 2009
Android experts, I have a tricky question that I would like some advice on. code...
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Sep 21, 2009
I'm planning to use the JavaScript interface to Java, to connect to Java methods that go to the network (or some other long-running function) and deliver the results via callback.
The flow is: 1. User clicks on a link in the WebView, which calls my Java code. 2. My Java code posts a worker Runnable to a Handler, and returns immediately. 3. The worker goes to the network, then makes a callback to the WebView.loadUrl("function('result')") to deliver the result.
I made an example that sleeps inside the Runnable. The entire WebView becomes unresponsive! What is the proper way (if any) of implementing a long-running JavaScript call?
Is it safe to call loadUrl() from multiple threads?
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Jul 24, 2010
I have an AsyncTask that scans the file system and publishes progress through Notifications. To do this I need a reference to the current Activity in the AsyncTask.
I also don't want to kill the task when the activity is destroyed. How do I avoid leaking the activity and everything it references on each configuration change?
One possibility is to remove the reference in OnPause() to be sure it is gone when the Activity is destroyed, but that would mean notifications stops coming as soon as you leave the activity which is no good.
Isn't there a recommended way of dealing with AsyncTasks in this way?
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Aug 11, 2010
I JUST had to restart my phone for the first time (some weird lagging started). It had been running since two days after launch (when I received it from letstalk.com)
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Feb 23, 2010
How can I stop an SMS over three messages long (So i assume this is 480 characters) converting to a MMS?
I'm probably being really stupid but I can't find the setting anywhere!
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Aug 24, 2010
I noticed that in a long threaded email with friends, when it got too long, it was stuck retrieving the email and I had to stop it and then try and download it all again (get remaining) and it never was able to retrieve it. When I finally got home to check the thread they were asking why I wasn't responding. Any tips on how to resolve long email threads not being retrievable?
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