sqliteopenhelper

问题 In my application I have a listview. I get my data with a query from a SQLiteDatabase. When I get the data from the db I get this error: It occurs when I go from line 20 to 21. I tried placing cursor.deactivate() and cursor.close() on regel 50. But with no result. Anyone knows why I get this error and how to solve it? Thanks :) 回答1: You have to close the cursor before the database. Put your code in a try / catch block and in a finally block, close the cursor and then close the database: try {

问题 I want to insert the data from JSON array into the SQLite database. I have created two classes CategoryHelper.java and AndroidJSONParsingActivity.java to get the java response. When I run the code got the exception in databaseHelper.saveCategoryRecord(id,name); My API is working fine and giving me the data. My code is below: CategoryHelper.java package com.androidhive.jsonparsing; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import

问题 In my android app, I use SQLiteOpenHelper to implements ContentProvider. Query, add, delete operations are all through ContentProvider. But in one of my android phone(htc g13), I found *.db-wal file in directory /data/data/[package name]/databases. And the file size increate very fast when operating with ContentProvider. It occupied user RAM space too much. It is recommended to close the SQLiteOpenHelper to solve my problem (it is useful) in post enter link description here. But I want to

问题 I know this has been asked a couple of times before, but in all those questions neither the OP's nor the people who answered, provided clear examples. So what I'm trying to ask here is if having a class like this public class MyDatabaseDB { // database constants public static final String DB_NAME = "mydatabase.db"; public static final int DB_VERSION = 1; // list table constants public static final String LIST_TABLE = "list"; public static final String LIST_ID = "_id"; public static final int

问题 sqlite: (1) near ")": syntax error I don't understand, I thought (and still do) that I put every space (and ect.) needed maybe someone could help me? thanks for your time public class DatabaseHandler extends SQLiteOpenHelper { private static final int DATABASE_VERSION = 3; private static final String DATABASE_NAME = "rekordai"; private static final String TABLE_REKORDAI = "rekordai"; private static final String KEY_ID = "id"; private static final String KEY_REKORDAI = "rekordai"; public

问题 I know this is a pre-asked question. But still I am not able to find solutions. I am opening a database with a SQLiteOpenHelper and applying insert and query method in SQLiteDatabase object. But I am getting NullPointerException in query method -- Here is my openhelper class: public class MovieDbHelper extends SQLiteOpenHelper { private static final int DATABASE_VERSION = 2; static final String DATABASE_NAME = "movie.db"; public MovieDbHelper(Context context) { super(context, DATABASE_NAME,

问题 android cant copy my pre create db from assets , the old db still exist in data/data/packagename/dabases, i want to change old db with new one ive tried to change this.getReadableDatabase(); into SQLiteDatabse db = this.getReadabledatabase() if (db.isOpen()){ db.close(); } public void createDatabase(){ boolean dbExist = checkDatabase(); if(!dbExist){ this.getReadableDatabase(); SQl try { copyDatabase(); }catch (IOException e){ Log.e(this.getClass().toString(),"eror kopi"); throw new Error(

问题 I'm trying to use the SQLite rawQuery method, based on the code here: Android record exists() in database? ...but I get " The method rawQuery(String, String[]) is undefined for the type OdaaDBOpenHelper Authorize_Activity_DynamicControls.java " with this code: OdaaDBOH = new OdaaDBOpenHelper(this); . . . private boolean RecordExists(String _id) { // This: Cursor cursor = OdaaDBOH.rawQuery("select 1 from NAPOLEON_DYNAMITE_TABLE where _id=%s", // or this: //Cursor cursor =

问题 This issue only applies to an SDK 28 device (emulator). My SQLite database created with SQLiteOpenHelper works perfectly in the app, however when I export it to a disk (either by means of Android studio or by the code), much of its data is lost. Changes made to this database in the app are immediately reflected in the app but are not reflected in the exported database file. The database file that I am trying to export is located here: DDMS -> file explorer -> data -> data -> my package name -

问题 I am making an android app that searches for restaurants in a SQLite database. I currently use a custom loader (that I found online) to load a cursor from the database and then take that cursor and populate a listview with a SimpleCursorAdapter. I want all the data to be bound but only the name of the restaurant to be displayed (because when I click on a list item I want to get all the data and send it to a new activity that displays the data). If I specify the restaurant name and restaurant