Android :: Android ContentProvider Database Query Multiple Tables
May 7, 2010
I'm writing an RSS reader for Android. I've faced a certain difficulty which the problem I can't resolve since databases aren't my expertise.. So i figured out maybe one of you could help me out! I currently have 3 tables (Categories, links and feeds). My goal is too link a feed to multiple categories. Therefor I'm using a Link table. My databases is an Android ContentProvider (sqlite) and looks like the following:
| Categories | | Links | | Feeds |
|------------| |---------| |-------|
| _ID | | Category| | _ID |
| Title | | Feed | | Title |
| URL |
I currently wrote the following code in my FeedListActivity to retrieve a list of links and their feeds.
CODE:.................
Now my question:
I was wondering how I could optimize this database layout, code or query so I would get my entries in a more efficient way. Because i believe this link table or the query to retrieve links isn't needed! Or am i doing this the correct way?
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Oct 6, 2009
I want to operate on multiple tables. I searched a lot but everywhere I could find is single table with one content provider.
How can I use multiple tables under one content provider? How can I get result from two/three tables ?
Can I provide my own SQL select query from multiple tables in ContentProvider?
Can anybody give me any example or link where I can get idea?
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Feb 22, 2010
How to create two or more tables in one database in single class which extends sqliteopenhelper in one function oncreate.
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Apr 5, 2009
How to retrieve data from two tables via the ContentProvider way? I.E. the database of Calendar application, include many tables including Events and Deleted, and some others. I want to retrive records in Events table, whose _sync_id field is also in Deleted table. Usually, we write a SQL sentence like: select (all fields in Events) from Events as e, Deleted as d where e._sync_id = d._sync_id or select * rom Events as e where e._sync_id in select _sync_id from Deleted etc. But, how can I accomplish it in the ContentProvider way? I saw ContentProvider.query take a Uri as the first parameter, but pity that I don't know how to build one that could fulfill my purpose.
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Sep 27, 2010
I'm trying to reduce the number of queries I do to the Android's database. Basically I want to get any email or IM address that contains a user defined search term. Right now I'm doing two separate queries:
Email:...............
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Oct 11, 2009
I have been playing around with the SearchableDictionary sample application trying to understand it.
I set a breakpoint in DictionaryProvider.query() and verified that it's going in there when I turn on search for this application (settings > search > searchable items > Searchable Dictionary).
Then I tried modifying the AndroidManifest.xml file, changing the launch activity to .WordActivity --
CODE:..............
I also had to change WordActivity so it would startup (albeit not be useful) --
CODE:...............
My expectation was that when I ran it and typed something in the QSB (search box on the main android page), it would still trigger the breakpoint. It's like it doesn't even recognize that the app should be part of the search anymore. I try moving the manifest changes back and it goes back to working.
The thing that led me down this path was that I am trying to write my own ContentProvider, and I can't get the QSB to call my query method. So what gives with this sample code here? What is preventing (or enabling) query() to be called from the QSB?
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Jul 30, 2009
I am trying to create a database with two tables. Employees and Computers. A spinner with employee names fill properly when I don't try create and do anything with the second table...
The code to create is:
CODE:.........................
Is there somehting I am doing wrong during the creating, as the rest of the code (to read data) is exactly the same...
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Oct 6, 2010
I created a data base named as example.db with some tables in SqlLite. It worked fine. It was also created in data/data/com.mypackage.myapp/databases/example.db. Now, I need to open that database and see the content in the database.
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Nov 10, 2010
I have this database file under the usual databases folder and a bunch of tables inside it. Please note that I don't want to retrieve under the command line. I know I can use the ".tables" command. I want to retrieve a list of all tables in it, using code, so that I can execute some specific algorithms on each of them. Also, I didn't find any questions with this problem on Android, so please forgive me if there is any. I was wondering if there is any function I can use under Databases, but I didn't find any either.
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Oct 16, 2010
Where do the tables created using SQlite database will be stored in Android? how to access them and see the data contained in them.
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Jan 27, 2010
I am new to Android and i would like to know if there's any tool to see databases (.db) tables and data into these tables.
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Aug 22, 2010
I'd like to populate a listview from 2 tables. Anyone know how I can achieve this? Currently what I have looks like but it only works with one adapter.
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Oct 21, 2009
Is it possible to create a custom ContentProvider to
* access android existing database (e.g. Contacts, SMS)?
* extend an Exciting ContentProvider which has access to android existing database (e.g. ContactsProvider to access Contacts DB)?
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Aug 18, 2010
I just encountered the following situation. I have an Android app with a scenario which I guess may happen in multiple apps. It's about tagging/labeling/categorizing, call it as you want.After CommonsWare's feedback here a bit of a clarification. I'm weird about doing the second query to the DB inside the CursorAdapter, basically this would result in one query per row and I fear this will heavily impact my performance (I've still to test it on a real device with a substantial amount of data to see how much this impacts).My question therefore is on whether there are some strategies on how to avoid this given my data model or whether I have to basically "live" with that :)
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Aug 7, 2010
I have implemented the search functionality using the android search dialog.to search multiple columns of a table using LIKE query.But search became slow as I have written a query in such a way that every time the text of each field(like the sample fields title,description category etc.) will be searched. title LIKE "---"OR description LIKE ''---"OR.....category LIKE "---"OR location LIKE"---"to. So is there any other way to speed up the functionality..
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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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Oct 20, 2010
Please direct me to a description of the techniques that the ContentProvider employs to access data. I am trying to understand how it works as well as what is tunable or even if its meant to be tunable. It the memory management tiered, cached, virtual, flat? Is it file based, shmem based, stream based? Can there be a combination thereof?
Any information, suggestions, or references are welcome. The android fundamentals page says: "The data can be stored in the file system, in an SQLite database, or in any other manner that makes sense;" but the android ContenProvider page barely skins the onion.
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Sep 16, 2009
In android, How can I query the name of the MMS sender and text of the MMS from MMS database? For SMS, there are these 2 columns for that: Sms.PERSON_ID and Sms.Body. But what is the equivalent columns in MMS Table?
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Jul 22, 2009
I wanted to remove duplicates from the database. In my db duplication can be defined by combination of multiple columns. For example :............
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Sep 23, 2009
Can anybody suggest what functionality to provide in a query utility class/classes? The idea is to provide a database utility package for android developers. I just wanna do it for android community and of course for my learning.:-)
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Sep 3, 2010
In my android app i need to get 50,000 database entry(text) and compare them with a value when the activity started(in onCreate()).I am doing this with the simplest way : i get the whole table from db to a cursor.However this way is too laggy.Are there any other way to do it more effective?The app is "scrabble solver" that is why i am not using WHERE close in my query (Take the whole data annd compare it with combination of the input letters).At first i was using a big table which contains whole possible words.Now i am using 26 tables.This reduced the lag and i am making database call on a thread that solved a lot problems too.It is still little bit laggy but much better.
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Jun 5, 2009
Can you please tell me how can I query all phone numbers of all Contacts in the Database? Where can I find some examples for that?
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Feb 25, 2010
My Android app has a ContactsList activity in which I simply display a list of contacts that are on the phone. Only recently I noticed that my activity only displays contacts synced with my main Google account. I have two Google accounts on my test phone and ideally I want my activity to display the contacts for both accounts (or multiple accounts). How do I query across multiple accounts?
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Jun 16, 2009
I have the following code which queries 1 number of a contact. It works. But how can I change it so that I can query multiple numbers (work, mobile, home) for the same contact and the type of each number?int phoneColumnIndex = cursor.getColumnIndex(People.NUMBER); if (phoneColumnIndex != -1) {String phone Number = cursor.getString (phone ColumnIndex); System.out.println (" phoneNumber:" + phoneNumber);
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Jul 22, 2010
I'm trying to structure a URI that accesses my data by id. Currently my URIs are query based like so: How could I structure a similar URI so that I could query for notes in multiple lists?
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May 20, 2010
I've got a database. In its "tags" column, rows can have a combination of multiple values "A, B, C"--such that: row 1 has "A" row 2 has "A, C" row 3 has "B, A" and so on, in various permutations. I am trying to implement search using a managedQuery such that I can return a cursor that contains rows with one or more values in the query. For example, if the user enters "C, A" for a search, s/he should get all rows that have A, C, or A and C. I'm splitting the user query on the comma (",") character, and the final call is as follows (parameters replaced by actual values):
mActivity.managedQuery("content_uri", [id, title, tags], "title LIKE ? OR tags LIKE ?", [%A% OR %C%, %A% OR %C%], "title ASC")
Even though there are rows in the database that contain A, C, or A and C--the managedQuery returns nothing. Thankfully, if the query is for "A", or for "C", the appropriate rows with "A" or "C" or "A and C" are returned. It's just that a query with more than one search term returns nothing. What am I doing wrong here? My guess is that %A% OR %C% is incorrect logic, but why?
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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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Nov 5, 2012
I'm populating a listview from a database query and I can't seem to figure out what is going wrong.
As you will see in the image, the query is returning some sort of id. I've done a ton of googling, but the problem is that I don't know what to search!
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Apr 10, 2009
Has anyone other than me needed to make consecutive queries to a sqlitedatabase? My application works sometimes but other times (about 98% of the time), the app will crash. What I'm doing is using the sqlitedatabase.query(..) to return a cursor which I parse, I make multiple successive queries to the database and parse different recordsets/cursors.
My question would be does a sqlitedatabase need to recover or clean up after a .query is issued?
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Apr 27, 2010
I have been trying to find a discussion on the best way to handle a common sqlite database which is shared by multiple Activities (or multiple Activities and Services). This is all in the same application.
It seems that if each Activity has:
CODE:.........................
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