StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAndroid: opening and closing SQLite database
primarykey
Id
16171512
data
AcceptedAnswerId
16172985
AnswerCount
2
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-04-23T14:07:10.100
FavoriteCount
1
LastActivityDate
2013-04-23T15:23:52.877
LastEditDate
2013-04-23T15:23:52.877
LastEditorUserId
1584654
OwnerUserId
1584654
ParentId
0
PostTypeId
1
Score
3
ViewCount
1556
LastEditorDisplayName
text
Body
I'm developing and android application in which I often use access the local database. This database can be accessed from differents therads, so I have a coordination problem for the database. I use the following <code>open()</code> and <code>close()</code> method. <pre><code>public void open(){ mDb=mDbHelper.getWritableDatabase(); } public void close(){ mDb.close(); } </code></pre> So, usually, when I need to access the db for some operations I open the database, then I perform some operation, and finally I close the database. The code I typically use for this purpose is the following: <pre><code> try { dbManager.open(); // database operation } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { dbManager.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } </code></pre> But, if for this piece of code is used from differnts threads (supposing thread A and thread B) the following situation may occurs: <pre><code>A thread: performs open() B thread: perfroms open() A thread: perfroms some operation A thread: performs close() B thread: try to perform some operation but it fails! </code></pre> So, the only solution I can guess I to perform <code>open()</code> when my application starts and <code>close()</code> when my application is stopped. I'm not sure that this can be this a good solution? In effect, the documentation of <code>getWritableDatabase()</code> method (called from my <code>open()</code>) says: <pre><code>Make sure to call close() when you no longer need the database </code></pre> So, anyone can suggest me an alternative solution?
Tags
<android><database><sqlite><android-sqlite>
Title
Android: opening and closing SQLite database
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USGVillani82
UserOwnerUserId
1. USGVillani82
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POAndroid: opening and closing SQLite database
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 POAndroid: opening and closing SQLite database
 UserUserId
 USstinepike
 VoteTypeVoteTypeId
 VTFavorite
3. VO
 singulars
 PostPostId
 POAndroid: opening and closing SQLite database
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

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.