Android :: Retrieve Single Column Of Last Row In Sqlite / Droid Using ORDER ID Desc Limit 1
Nov 10, 2010
I'm attempting to create a method that will allow me to retrieve a value from the last row of a database, and then insert it into an EditText field. (This is a value that the user will not change all that often, so it would be helpful if when they do set it, it stays set when they come back to it).
My method, based on a similar method I have for getting the total of a specific column, is as such. code...
If I run the program without this statement, it works fine and the value saves to the db. As soon as I try to run it with this, I get a force close. Any suggestions?
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Apr 20, 2010
So I have an app on the market, and with an update I want to add some columns to the database. No problems so far. But I want to detect if the database in use is missing these columns, and add them if this is the case. I need this to be done dynamically and not just after the update to the new version, because the application is supposed to still be able to import older databases. Normally I would be able to use the PRAGMA query, but Im not sure how to do this with Android. I cant use execSQL since it is a query, and I cant figure out how to use PRAGMA with the query()-function.
Ofcourse I could just catch exceptions and then add the column, or always add the columns to each table before I start to work with it, but that is not a neat solution.
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Jul 15, 2010
I have two files, one called "part1.txt" and another one called "part2.txt", which look like following
part1.txt part2.txt
lili like eating apple
lucy like playing football
Now i want to insert the contents of these two files into a single table with the schema
table_name(linefrompart1 varchar(100), linefrompart2 varchar(50))
My program reads the first file line by line and insert the data into the first column. But if it reads the second file and tries to insert the data line by line into the second column, it doesn't work the way i want. A table which i want should look like following
linefrompart1 linefrompart2
lili like eating apple
lucy like playing football
But instead i got the following table
linefrompart1 linefrompart2
lili null
lucy null
null like eating apple
null like playing football
Does somebody know how i can fix this problem?
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Dec 16, 2009
I want to know how to store the images in SQLite database in android.and also how to retrieve it. anyone give the samplecode or any URL give me to develop my application.
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Oct 21, 2011
I am new to android development and have been tasked with developing an app. One of the screens will require there to be a list of people with some thumbnail information about them, similar to:
Code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
[code]....
This information will be stored in an SQLite DB. Now I can see that listView seems only to work with a single column. What is the best way to go about this?
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Jun 21, 2009
I am trying to utilize what has allready been written for this, in my own database
I will actually post my code so someone may be able to pick out what is wrong
This is the error i get: 06-21 19:57:35.511: ERROR/AndroidRuntime(796): Caused by:
code:................
This is the method its faulting on in Class:
code:..............................
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May 4, 2010
Can I create index on a column in the create table command in sqlite?I tried this command below in sqlite3 in Android shell. It seems to work.But, in sqlite's query language specification, specifying a column to be indexed is not supported.
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Oct 12, 2009
I have a database that I download external and save on my sdcard. But this database is also used for an iPhone app and has a column id and not _id (sqlite uses _id). How can i rename this column to _id?
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Oct 7, 2009
I have a TEXT column and I want to match all rows where the value has a certain prefix. For example, WHERE mycol LIKE 'myprefix%' However, I noticed in some optimization guidelines that this will not use the index and instead you should do this:WHERE mycol >= 'myprefix' AND mycol < 'myprefiy'Instead of simple A-Z chars, I have a whole variety of UTF-8 chars (think chinese characters).My question is, how to work out the next char in UTF-8? Is it enough to add one to the codepoint,
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May 8, 2010
I am trying to update a datetime column in an android sqlite db to use international date format (yyyy-mm-dd) instead of the current format (mm/dd/yyyy). I want to use the sqlite date() function to reformat the current value of the column. I thought it would be as simple as the following: update tblename set thedate = date(thedate)
But the above does not work.
How would i write the sql statement to accomplish this?
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Jun 23, 2010
I'm working on an Android App where the user has different options for sorting the displayed data that comes from the database. Currently my orderBy string that I pass to Androids query() method looks like this:
"LOWER("+columnName+") ASC"
The problem with this is that if the data type in the column specified by columnName is integer, calling LOWER() on it will cause it to be sorted alphabetically, i.e. based only on the leftmost digit, which of course doesn't make any sense for numeric data. Hence I only want to apply LOWER() if the data type of the column is not integer. What I have in mind is a statement like this:
"CASE WHEN [data type of columnName is integer] THEN "+columnName+" ASC ELSE LOWER("+columName+") ASC END"
The part in the brackets is what I don't know how to do. Does SQLite provide a function to determine a column's data type?
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Oct 12, 2010
I uploaded an update to one of my apps. I caught a bug in testing shortly after. I noticed that the Upload Upgrade link had disappeared, and I only have the ability to completely remove the application. I uploaded the last update yesterday, so it has been about 15 hours. I'm guessing there is a 24 hour waiting period so that you don't flood the market with updates, but I can't find documentation to confirm.
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Oct 11, 2009
I have an SQL which uses something like "LIMIT 100". If the cursor returns 100 rows, is there an efficient way of distinguishing between whether the LIMIT caused it or not? I suppose I could just call LIMIT 101 instead but I was hoping for a nicer way.
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May 8, 2013
I am developing an application in android allowing the user to maintain his weight by providing him diet suggestions. I have done with that part and now, I need to display user weight tracking details using bar graph. I am able to fetch the Weight and Login date column data from the sqlite database to List<String>. I don't understand the way to put these values into a Bar Graph with Date Column data as X-axis and Weight column data as Y-axis.
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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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Apr 22, 2010
I am trying to fetch sms messages from inbox, sent items and drafts. I would like to do a pagination for my list view for that it's imperative that I fetch records in pages/chunks.
I am not familiar with sqlite which is the database I understand android use to store the data. Can someone tell me how can I restrict the number of records I am fetching by using contentResolver.query?
Also what is the way to pull the sqlite database file onto my machine and browse/query it locally to experiment or see data on my machine?
Are there any other better ways to implement pagination in android?
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Nov 1, 2010
I have a database (stored on a Class 6 SD card) with a single empty table (5 columns). There is an index on each column. Performing a single INSERT statement (whether using an SQLiteStatement or calling SQLiteDatabase.insert()) takes about 800ms on my N1 (2.2.1). The INSERT statement does NOT do anything fancy (like subselects). Is there any way to speed this up?
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Sep 1, 2010
I need to store an retrieve a vector of an unknown number of objects in an android sqlite database. Essentially, the setup is this: I am developing a task management app, where the user can add as many notes as they like to their tasks. My current setup uses one database, with one row per task. This presents a problem when I need to associate multiple notes and their associated information with one task. I can see two approaches: try to store an array of notes or a vector or something as a BLOB in the task's row, or have another notes database in which each row contains a note and it's info, as well the id of the task which the note belongs to. This seems a little easier to implement, as all I would have to do to retrieve the data would be to get a cursor of all notes matching a particular id and then iterate through that to display them to the user. However, it seems a little inefficient to have a whole new database just for notes, and it makes syncing and deleting notes a little more difficult as well. What do you think? Is it worth it to have a separate notes database? Should I use a BLOB or go for the separate database? If a BLOB, are there any good tutorials out there for storing and retrieving objects as BLOBs?
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Oct 27, 2010
I am new to android development.currently i am facing a problem while inserting/retrieving image to sqlite database using android Code...
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Jul 30, 2010
I'm trying to get a query that returns rows only with a specified name, and sort descending by week (integer).
Everytime I try and run it it gives me a FC and logcat says
CODE:..........
It says that there is no such column, which doesn't make sense because it should be looking at the names in the row and returning the ones that match. Also if I put KEY_NAME + "=" + name as null, it says that there is no such column WeekDESC which doesn't make sense either cause it is just supposed to be sorting by an integer. I have gotten this code working before, but I misplaced it and can't seem to get it working again...
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Aug 10, 2010
See title for explanation.
Here is the method I'm using:
CODE:.........
And here is the call to the method:
CODE:...........
Why it would be throwing the "No Column Found with name=Test", although my DB explorer shows there is indeed a column named name and a value in a row named Test?
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Nov 16, 2010
How do I store and retrieve a byte array (image data) to and from a SQLite database in Android?
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May 5, 2010
I'm not sure how to set up the desc.text file could anyone help?
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Jul 14, 2010
I created a sql lite database with the following columns:
static final String dbName="demoDB";
static final String tableName="Employees";
static final String colID="EmployeeID";
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+tableName+" ("+colID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer);");
I want to select all the records in the database like this and display them in a gridview:SQLiteDatabase db=this.getWritableDatabase();Cursor cur= db.rawQuery("Select "+colName+", "+colAge+" from "+tableName, new String [] {});String [] from=new String []{DatabaseHelper.colName,DatabaseHelper.colAge};
int [] to=new int [] {R.id.colName,R.id.colAge};
SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
GridView grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(sca);but i receive the following exception:java.lang.IllegalArgumentException: column '_id' does not exist.the db table does not have a column with name '_id'so what is wrong with this code
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Jul 16, 2010
This has got me all confused! I'm trying to return the max value from a column in my database but the return value is always the name of the column.
The query I use:
private static final String SELECTMAX = "SELECT MAX(?) FROM " + TABLE_NAME ;
The (test) function to return the max value:
CODE:............
The column i'm querying is an INTEGER type but the result 's' is always the column name and not the desired value.
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Sep 4, 2010
I have one EditText, and I want to get the current column position.
I am using SDK 1.5
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Mar 12, 2010
I have an android application that shows a grid view that shows:
1
2
3
4
GridView gridview=(GridView)findViewById(R.id.GridView_test);
DataBaseHelper dbhelper=new DataBaseHelper(this);
ArrayList<String> test=new ArrayList<String>(5);
backlinksadapter.add("1");
backlinksadapter.add("2");
backlinksadapter.add("3");
backlinksadapter.add("4");
ArrayAdapter mAdapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, test);
gridview.setAdapter(mAdapter);
By the moment is working, but i would like to show foreach line of the grid, 2 columns with the values of a 2 dimensional array (something like the GridView in ASP.Net - as datasource -).
I would like to show:
1 | Person 1
2 | Person 2
3 | Person 3
4 | Person 4
Any idea?
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Aug 13, 2009
How can you specify a column span in an android's gridview?
I have a gridview that displays 3 images for each row. Sometimes, there are images that have to span 2 rows.
Is it possible to do that in Android?
or should I be using a different view?
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Aug 21, 2010
The add/remove columns UI of TweetDeck android app is very promising. But I have no idea how to make one like that.
If I make it with HorizontalScrollView, and the children with layout_width set to "fill_parent" code...
I can't scroll horizontally and only see one view.
If I set the layout_width with number like this: layout_width="320sp" then the two columns sit next to each other and I can scroll horizontally.
Do you have any idea how TweetDeck makes theirs?
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Mar 20, 2010
Been reading about this for the Nexus and it looks like some are having luck using it on the Droid. Going to play with it later...
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