android-sqlite

问题 Mac OS-X Android Eclipse with ADT SQLite I'm new to creating Android Apps and Ive researched this heavily but I'm getting nowhere. I need to query my SQLite database to return all the rows between 2 dates. What I have learnt from my research so far is that there is no DateTime column in Androids SQLite database and I have to save it as a text column. But I think the problem lies with trying to compare Strings but I can't figure out a way around it. Here is my code : DB = currentContext

问题 We are trying to create a mobile app using PhoneGap/Cordova. We need to ship this app with a pre-populated SQLite db. We are able to copy the DB using below code. But when we try to access tables from copied DB in our App we get 'No Such Table' error. Can anyone help us in identifying the cause ? We copied the database using the below code to data/data/package_name/databases folder. try { File dbFile = getDatabasePath("Bee_dict.db"); if(!dbFile.exists()){ this.copy("Bee_dict.db",dbFile

问题 When the mainactivity tries to open the database for the first time after the app is installed, the SQLiteHelper Oncreate method is triggered (as one would expect). I want to then populate the database after the datatables are created in OnCreate, but doing so requires me to open the database again in my content creator class (which is called from OnCreate). The app crashes when it tries to open the database in the content creator class Basically I'm trying to populate the database once it is

问题 Thanks in advance. I am developing a Car Review Application, where user can log in and displayed all the review from the Database. All the the data is being stored in MYSQLdatabase first. I am using json to connect to the MYSQLdatabase and SQLiteDatabase. But the problem is that, after log in the application screen huge no. of data is coming from the server and it is being inserted in our SQLite Database. After that it is being retrieved from database and displayed in the Application Screen

问题 I would like to create a multi table database with all the RUD (minus the C) in a databasehandler class, but have all the tables created and updated in a helper class. Here is what i've been using for a single table: package com.cc.folfapptest; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class ConfigDatabaseHandler extends

问题 Is it better to have a single big SQLiteOpenHelper subclass that defines onCreate and onUpgrade methods for every table in the database, or is better to have many SQLiteOpenHelper subclasses, one for each table? Is there a best practice? Or are both acceptable, but with different good and bad side effects? 回答1: You should have a single SQLiteOpenHelper class for all the tables. Check this link. 回答2: Just for the sake of a different approach: You can always overried on the onOpen(..) method

问题 I have upgraded my Nexus 7 with Android 5.0 Lollipop, Before that my application going well with SQLite Database but now Whenever I execute any type of query, It gives me log cat error like: 12-09 12:37:04.942: E/SQLiteLog(13041): (284) automatic index on area(server_id) 12-09 12:37:04.942: E/SQLiteLog(13041): (284) automatic index on account(area_id) 12-09 12:37:04.942: E/SQLiteLog(13041): (284) automatic index on staff_visit(account_id) 12-09 12:37:04.942: E/SQLiteLog(13041): (284)

问题 Hi everybody I was stuck at a point, the problem is that I have three classes shown below and I want to instantiate my DatabaseHelper class in AsyncTask class. Could you please help, how can I get context in AsyncTask class? Problem Solved MainActivity class public class MainActivity extends Activity { ... FetchData fetchData = new FetchData(); fetchData.execute(); ... } DatabaseHelper public class DatabaseHelper extends SQLiteOpenHelper { .... public DatabaseHelper(Context context) { super

问题 I Would like to select all entries from an SQLite table if the entries timestamp matches todays date. I am querying an SQLite database as follows: // Tasks table name private static final String TABLE_TASKS = "tasks"; // Tasks Table Columns names private static final String KEY_ID = "id"; private static final String KEY_TIMESTAMP = "timestampGMT"; private static final String KEY_DESCRIPTION = "description"; String selectQuery = "SELECT * FROM " + TABLE_TASKS + " WHERE "+ KEY_TIMESTAMP+">=date

问题 I have developed an App ..For that I have a database and it has many tables. One of the table has date column. My question is I have to sort the dates and have to pick oldest one Like Oct-24-2012 from below table column Column_Date ------------ Nov-07-2012 Nov-21-2012 Nov-25-2012 Oct-25-2012 Oct-24-2102 How should I do that....I have stored the date column in string... If I need to change the datatype for date Column, Let me know which Datatype should i used. And How Should I sort the Column