Android :: Create A Indexed Column In Sqlite
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.
View Complete Thread with Replies
Sponsored Links:
Related Forum Messages:
Android :: SQLite Matching Prefix On Indexed Column
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,
View Replies!
View Related
Android :: Sqlite - No Such Column Name SQLITEexception
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:..............................
View Replies!
View Related
Android :: Detect If A Table Contains A Column In Droid / Sqlite
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.
View Replies!
View Related
Android :: Reference Sqlite Db Column To Use In Update Statement
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?
View Replies!
View Related
Android :: Determining Data Type Of Column In SQLite
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?
View Replies!
View Related
Android :: Retrieve Single Column Of Last Row In Sqlite / Droid Using ORDER ID Desc Limit 1
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?
View Replies!
View Related
Android :: Create Column Like Layout For ListView Rows?
I have a relative layout which looks like this: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/nameText" android:layout_width="wrap_content"......................
View Replies!
View Related
Android :: Sqlite Exception:java.lang.Illegal Argument Exception Column Id Does Not Exist
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
View Replies!
View Related
Android :: Select Max - Column - Returning Only Column Name
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.
View Replies!
View Related
Android :: How To Create A Sqlite Dist Db Function
We are building an Android App that will use user's current location (lat, long) and show top 50 venues around the current location, sorted by distance.We have these venues stored in an SQLite DB. We plan to ship with the sqlite DB with the app.In order to fetch only the relevant top 50 closest venues, we want to define a db function DIST (to calculate distance between two points) and use it in our query.How can I define a custom SQLite function for Android Apps? What will be the Java API call to do this?We have successfully implemented this approach in our iPhone App - using Objective C.
View Replies!
View Related
Android :: How To Use SQLite Database? (Create / Open)
I am trying to use SQLiteDatabase.openDatabase( "/data/data/edwin11.myapp/databases/myapp.db", null, (SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.NO_LOCALIZED_COLLATORS)); To create/open a database instead of making use of the SQLiteOpenHelper (because I want to pass in the flag SQLiteDatabase.NO_LOCALIZED_COLLATORS. However, I am getting this exception for that line of code: 04-18 09:50:03.585: ERROR/Database(3471): sqlite3_open_v2("/data/data/edwin11.myapp/databases/myapp.db", &handle, 6, NULL) failed 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): java.lang.RuntimeException: An error occured while executing doInBackground() 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.os.AsyncTask$3.done(AsyncTask.java:200) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:234) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:258) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask.run(FutureTask.java:122) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.lang.Thread.run(Thread.java:1060) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): Caused by: android.database.sqlite.SQLiteException: unable to open database file 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1584) 04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:638)... Doing some testing just before that line of code (using File.isExists) shows that the file /data/data/edwin11.myapp/databases/myapp.db does not exist. Would that be the cause of the error? (Or am I just using SQLiteDatabase.openDatabase the wrong way?) Would it help if I create the file beforehand? (Shouldn't that be taken care of by the SQLiteDatabase.CREATE_IF_NECESSARY flag that I passed in?) If creating the file manually is the way to go, is it just an empty file, or do I have to write something to it?
View Replies!
View Related
Android :: Create A Standalone Sqlite Database And Then Put Into My Application?
I want to create a sqlite database by importing data from some data files, like csv etc., and then put this database into one of my android application and then deploy into the Android device. By now the samples and tutorial what I found are all taliking about creating the sqlite database at runtime when running the android application on the device. Is there anyway I can create it offline and then attach it to my application later? Any tools and docs for this?
View Replies!
View Related
Android : Create A Sqlite Database That I Can Manually Input Data From My Computer
I have certain needs that I am having trouble making an app for. I was hoping to be able to create a sqlite database that I can manually input data from my computer and search the data on my droid. I wanted to set up tags or full data search within each sqlite database object so and pull up a listing of best matches for the given search term. The use for it is that I work on an Air Force Base and my job is very broad. I wanted to custom build an app that I could list all of the information pertaining to my job and be able to search it as I work to find solutions to problems way quicker than we are doing it now. Is there any such app. I've been trying to create my own and it looks like it would be a mix between notepad and searchable dictionary but not quite.
View Replies!
View Related
Android :: Column Id Does Not Exist
the error in my logcat is such Logcat 08-29 08:20:57.961: ERROR/AndroidRuntime(1766): java.lang.RuntimeException: Unable to start activity ComponentInfo{one.two/one.two.Booking}: java.lang.IllegalArgumentException: column '_id' does not exist 08-29 08:20:57.961: ERROR/AndroidRuntime(1766): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268) 08-29 08:20:57.961: ERROR/AndroidRuntime(1766): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284).................
View Replies!
View Related
Android :: Get Count Column
I'd like to get the value of Count column from cursor. CODE:............... I tried to get this count column value from cursor like below Cursor cR = mDbHelper.getRCount(cplace);if (cR.getCount() > 0){long lCount = cR.getLong(0);}cR.close();} I got the debug error. How to get it? Could I use nested cursors?
View Replies!
View Related
Android :: TableLayout - Row And Column
I want to design a table whose first column items remain fixed when user scrolls horizontally, but should scroll when the user scrolls vertically. Similarly the first row items remain fixed when user scrolls vertically, but should scroll when the user scrolls horizontally. Can this be achieved using a TableLayout? Or is there any other combination of widgets that I could use?
View Replies!
View Related
Android :: SQLiteException - No Such Column -1
One of my android apps performs the following specific SQLite query: CODE:................ Now that works on some Android phones, but on a few of them it crashes with the following error: CODE:.................. For some reason, "-1" is interpreted as a column rather than a number... that doesn't make much sense and when I read the SQLite query language I see no need to escape this number in parentheses. Could it be an issue of a different version of SQLite? Would adding parentheses this help any? Instead, I'll probably rewrite it using >= 0 but still I'd like to understand what's going on.
View Replies!
View Related
Android :: Column _id Does Not Exist
I'm having trouble with something that works in the Notepad example. Here's the code from the NotepadCodeLab/Notepadv1Solution: CODE:................. This code seems to work fine. But just to be clear, I ran the adb utility and run sqlite3 I inspected the schema as follows: CODE:............... All seems good to me. Now on to My App, which as far as I can see is basically the same with a few minor changes. I've simplified and simplified my code, but the problem persists. CODE:.............. When I run my app, I get a RuntimeException and the following prints in LogCat from my Log.e() statement: LogCat Message: java.lang.IllegalArgumentException: column '_id' does not exist So, back to sqlite3 to see what's different about my schema: CODE:................. I don't see how I'm missing the '_id'. Can anyone point out what I've done wrong? One thing that's different between my app and the Notepad example is that I started by creating my application from scratch using the Eclipse wizard while the sample app comes already put together. Is there some sort of environmental change I need to make for a new app to use a sqlite database?
View Replies!
View Related
Android :: Two Column Table
I'm not big into UI programming so this may be an easy thing I overlooked. I am trying have a screen that shows 8 TextView in a 2 column x 4 row table. And, of course, I want the TextViews, that might have different lengths, to be centered. I tried this in a table layout, for obvious reasons but I feel like this is not the way to do it because it doesn't have much control where I put everything once it is in a row. Should I be using a different combinations of layouts or is there something I overlooked.
View Replies!
View Related
Android :: Id Column In List Adapter
I am trying to use a list adapter. While querying, i need to have a column called "_id" which helps to scroll through the database. I have an other primary key in this table. Can I use a custom column name, or am i bound to the "_id" column.
View Replies!
View Related
Android :: ID Column In Contacts Database
I read that the different entries in different tables are linked via the _ID column in that table. For example a contact might have an _ID = 1 I get via ContactsContract.Contacts._ID And now I want to read the phone number of that contact using CODE:............. This works fine, but what I would expect is that if the _ID of the contact is 1 that the _ID of the phone number is as well one since they belong together, but they are not equal. So the question is how does Android match these entries?
View Replies!
View Related
Android :: DDMS - Lost The Tag Column
This is an incredibly dumb question. So, apologies. But I can't find the answer anywhere and it's driving me nuts. In DDMS, I have lost the tag column, i.e. the first part of the message from Log.d(tag, message). I can see time, log type, process id, and message - but not tag! Anyone know how to get it back? I've tried right-clicking the columns, looking through the menus, etc - no joy.
View Replies!
View Related
Android :: Add Space Between Column In TableLayout
I am just developing application in android . i am building a test game TicTacToe . i am generating the GUI Programmatically i know i can develop the same gui using xml but again i am doing this for learning. okay, i have created a TableLayout and add three TableRows in it and each row i have created three buttons to create tictactoe interface . the problem i am facing is that when i add buttons in column in table row and run it there is no spacing between buttons. i have also use setPadding() method but it adds spacing around the whole row not in between columns. Here is the code:........................
View Replies!
View Related
Android :: Column Headings In TableLayout
I'd like to have column headings in a TableLayout and I'd like those headings to remain visible when the table is scrolled vertically. One option is to create a separate TableLayout just for the column headings but it's a little complicated keeping the column widths consistent between the two tables.
View Replies!
View Related
Android :: Bind More Then One Column To A Textview
I am curious if there is a way to bind more then one db column to a resource. I need to bind more information to R.id.secondLine then just the difficulty column. But I'm unsure how to go about this? I'm currently subclassing SimpleCursorAdapter. Should I subclass another adapter? If so How to do I go about it? CODE:............................
View Replies!
View Related
Android :: Set A EditText In A Certain Column Of A TableLayout?
I have a TableLayout on one Android Activity UI. It has two columns. Now I need to add a new row, and put an EditText box in second column of that new row. And also, I want that EditText full fill the whole cell. I have some code like this: CODE:.......................... It puts the EditText in the second column fine, but the EditText is too small. I tried to use etText.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); but that seems to disabled the TableRow.LayoutParams setting. I guess each control can only have one LayoutParamas setting. So, how to make the EditText as a 4 lines text editor and also make sure it is in the second column of that row?
View Replies!
View Related
Android :: TableLayout Column Sizing
I have a TableLayout with three columns that represents a form with requiredSymbol | label | inputfield. I want the input field to fill the remaining width of the screen right to the label. So far the only solution I found is this CODE:.................... The maxWidth needs to be there are some value, which is actually ignored. Then the stretchColumns value does its thing nicely. Note that this also works if the content of the EditText would otherwise make the table span beyond the screen border (imho a bug..). This works nicely now but seems a little bit of a hack to me. Is there a better way?
View Replies!
View Related
Android :: Want A Central Column Using Grid View
What I want is a central column using Grid View, but everything I try does not work. It always aligns to the left. I have tried messing around with layout_gravity and gravity to no avail. I have a Grid View in a Linear Layout: <Linear Layout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent".
View Replies!
View Related
Android :: Multi Column List View
I am trying to get a multiple column list view. The hello in the picture is the second column i m trying to achieve. Here is the link to picture. http://www.flickr.com/photos/34403563@N02/5057967965/ Here is my xml code, if someone can help me with xml properties for label 3 it would be quite helpful. code:.................
View Replies!
View Related
Android :: Display A Two Column ListView In Droid?
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?
View Replies!
View Related
Android :: How To LABEL An Invalid Column For Contact Method?
I am having a bear of a time figuring out what colums exist for email contact methods. Specifically, I want to find out the "home", "work" or "other" of an email address. I have tried looking for it under integer "TYPE" (illegal column), and under Strings "LABEL" (illegal column) and "NAME" (this works, but it is the owner/person's name, not the name of the email address). Is there a place where these schemas (as they are actually used) is documented well? the Javadocs seem to mislead me................
View Replies!
View Related
|
TRACKER
