android-sqlite

问题 I want my users to be able to reset the application, then I need to reset the SQLite database that I have created. How can I do that? I want to reset the database or delete and recreate the database. 回答1: Just delete your database by context.deleteDatabase(DATABASE_NAME); Please make sure to close your database before deleting. 回答2: Bit late but this can help other people public void clearDatabase(String TABLE_NAME) { String clearDBQuery = "DELETE FROM "+TABLE_NAME; db.execSQL(clearDBQuery);

问题 I want my users to be able to reset the application, then I need to reset the SQLite database that I have created. How can I do that? I want to reset the database or delete and recreate the database. 回答1: Just delete your database by context.deleteDatabase(DATABASE_NAME); Please make sure to close your database before deleting. 回答2: Bit late but this can help other people public void clearDatabase(String TABLE_NAME) { String clearDBQuery = "DELETE FROM "+TABLE_NAME; db.execSQL(clearDBQuery);

问题 I have a button in recycleview(part of cardview, which is generated for each insertion) which increments an specific column with id in SQLite, the data gets changed but I have to relaunch the activity for it to change. The changed data has to be shown in textview. I am new to this, how can I make them change dynamically? public class attendence_recycleadapter extends RecyclerView.Adapter<attendence_recycleadapter.ViewHolder> { private List<attendence> mattendence_list; private Context

问题 I have an app that depends on SQLite for data which is populated by xmls shipped with the app in the assets folder. When you run the app the first time it sets a shared preference config_run = false. then i check if config_run = false then parse the xml and dump the data into db set config_run = true Now i realize that when i have to push an update on Google Play and add more content into the XML. Even though i change the database version from 1 to 2. The import script wont run because shared

问题 I have a view pager in the MainActivity , this view pager contains two tabs RecentFeed and SavedFeed both uses the same FeedFragment as both has same layout Now I want to update the contents of these fragments when a new gcm message is recieved or there occurs a change in my database here is what have done so far : I created a changelistening interface as follows- public interface OnDatabaseChangeListener { void onChange(); } Then used this in helper class to notify changes as follows private

问题 I have a view pager in the MainActivity , this view pager contains two tabs RecentFeed and SavedFeed both uses the same FeedFragment as both has same layout Now I want to update the contents of these fragments when a new gcm message is recieved or there occurs a change in my database here is what have done so far : I created a changelistening interface as follows- public interface OnDatabaseChangeListener { void onChange(); } Then used this in helper class to notify changes as follows private

问题 I have a view pager in the MainActivity , this view pager contains two tabs RecentFeed and SavedFeed both uses the same FeedFragment as both has same layout Now I want to update the contents of these fragments when a new gcm message is recieved or there occurs a change in my database here is what have done so far : I created a changelistening interface as follows- public interface OnDatabaseChangeListener { void onChange(); } Then used this in helper class to notify changes as follows private

问题 This is addendum to my question SQLiteDatabase Cursor empty only on Android 5.0+ devices. That one will be closed as I was not sure what is causing the bug - thought it was a cursor note being properly filled. Now I have discovered what is causing empty cursor. Up to Android 5.0, search suggestions work by querying the database with the query: SELECT rowid AS _id, suggest_text_1, suggest_text_2, rowid AS suggest_intent_data_id FROM fts WHERE (fts MATCH ?) //for example '*e*' As of Android 5.0

问题 How can I do the following? I want to select a specific column in my room query. This column will be specified by as a parameter in the query function. Imagine my database looks like the following: +----+---------+---------+---------+---------+ | ID | Column1 | Column2 | Column3 | Column4 | +----+---------+---------+---------+---------+ | 1 | 13 | 45 | 77 | 12 | +----+---------+---------+---------+---------+ | 2 | 5 | 34 | 67 | 7 | +----+---------+---------+---------+---------+ | 3 | 8 | 33 |

问题 I am trying to copy created database sqlite file from android memory to an sdcard but I am getting "failed to copy" error. Is there a way to create the database sqlite file so it can be easily copied? Do I need to set permissions anywhere on the device? 回答1: Yes you do need permissions and how depends upon the API if less than 23 then you need to have <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> in your manifest (AndroidManifest.xml). If 23 or greater then you