android-sqlite

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . I am confused the which one good for android perspective either Ormlite or sqlite . please can you give me suggestion which one is better for use our android app. And makes easy to use and supported all android devices? I want to use the ormlite in our project but before i

问题 I'm trying to select some data from database and I have two slices of code to do it: cursor = builder.query(db, new String[]{"col1", "col2", "col3"}, "id = ?", new String[]{getSID(db)}, null, null, null); and cursor = builder.query(db, new String[]{"col1", "col2", "col3"}, "id = " + getSID(db), null, null, null, null); The difference between them is that first one seems to be more correct according to documentation, but it also doesn't work - cursor is empty. Instead of the second one - I'm

问题 I am a newbie of android world. I have a problem of the coding. It was just a tiny error buy i dont know it doesnt work even i change others method but the error still the same error. Here the error occur at logcat: java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor com.example.zellon.surveyapps.DatabaseHelper.getAData()' on a null object reference I just want to select the data in the database to get an id but cant cuz of the error above. I will give a

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . My application will contain a custom calendar, and according to this calendar user can create events and reminders. And the thing is, is it possible to create a custom calendar in android ? (I mean I want to create events in my calendar and these events will not appear in main

问题 I have parsed JSON successfully but now i want to Cache it for offline usage, even internet is not available, and if any new entry comes i want to cache that as well. And what would be the best option to cache data ? SharedPreferences or SQLite database Here is my code, which i am using to Parse JSON: public class MainActivity extends Activity { ArrayList<Actors> actorsList; ActorAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState)

问题 I have a two dimensional ArrayList of type String which is the input to the adapter class of the RecyclerView . The data in the list is taken from an SQLite database everytime when onResume() is called. I have implemented a drag and drop feature and an onMove() function that swaps the list elements successfully. However, I need to store the modified list before onResume() is called which will rewrite the list and fill it with old positions. My guess is to implement the rewriting functionality

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 I need to use SQLCipher for android...i've already made my app using SQLite and want to just convert it to SQLCipher. The problem is, I know nothing about SQLCipher. I have read about it in this link: http://sqlcipher.net/sqlcipher-for-android/ But i'm not too clear, still. I was wondering if you could provide some basic sqlcipher for android tutorials, where everything is taught in an easy way from the absolute basics. Thanks! 回答1: To properly use SQL Cipher for Android you must use external

问题 !Database consists of multiple tables and multiple columns as shown & i have pasted this law.sqlite in assets folder. Database consists of multiple tables and multiple columns as shown & i have pasted this law.sqlite in assets folder. Suppose i want to access all the elements of column AS_name as shown . So how should i code for it? 回答1: Try this: Cursor cursor = db.rawQuery("SELECT DISTINCT AS_name FROM Articles",null); // If you want in order then add "ORDER BY AS_name AESC" in sql query.

问题 Using the typical _id column and joining tables and selecting all columns when creating a cursor, will result in a cursor that contains multiple _id columns. To access a specific _id column would then require using the actual offset, as opposed to the column name. Using hard coded offsets can be problematic, it makes the code harder to read and thus to maintain. For example two tables shops and aisles as per shops Table has columns _id shopname aisles has columns _id aisleshoplink aislename