android-sqlite

问题 I want to get MAX value of one column in sqlite table. The problem is the type of data is long in fact but stored as text in the table.How can I do with this strange situation. I've tried of this below but it's not correct SELECT MAX(ColumnName) FROM TABLE; But it returned value but not correct!Please someone can help me 回答1: you could always cast the text to an int: SELECT MAX(CAST(ColunmName) as int) from TABLE 来源： https://stackoverflow.com/questions/41634060/how-to-get-max-value-of-column

问题 i have a problem when i'm using the Sqlite of android. The log show me that : SQLiteConnectionPool(1730): **The connection pool for /data/data/dev.xx.xx/databases/XX has been closed but there are still 1 connections in use. They will be closed as they are released back to the pool.** 08-02 14:15:41.490: D/AndroidRuntime(1730): Shutting down VM 08-02 14:15:41.490: W/dalvikvm(1730): threadid=1: thread exiting with uncaught exception (group=0xb4d74908) 08-02 14:15:41.510: E/AndroidRuntime(1730):

问题 i am creating an android application that use sqlite and images from drawable. what i need is to display the images existing in drawable folder according to their names in the sqlite database but the system display an error : The method getResources() is undefined for the type CustomAdapterMatchSchedule this is my code: row_list_match_schedule.xml <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/RelativeLayout1"

问题 I added the support library & appcompat to work with lower versions, then the code is working fine in higher versions, but in lower version the app crashes when it tries to fetch data from sqlite. While running in 2.2 the logcat showing these errors: 07-17 21:46:36.361: I/Database(520): sqlite returned: error code = 1, msg = no such table: Schedules 07-17 21:46:36.371: W/System.err(520): android.database.sqlite.SQLiteException: no such table: Schedules: , while compiling: SELECT DISTINCT *

问题 I am working on a student grade submission program that accepts the following inputs: Student ID, Student First Name, Student Last Name, Class ID, Class Name, Grade Points, and Letter Grade. In order to prevent data redundancy I have created three different tables. However when attempting to "modify" or "delete" an entry with two values from distinct tables I am running into a problem. (For instance delete WHERE student.id is equal to the student.id in STUDENT_TABLE and WHERE class.id is

问题 I am working on an android app with SQLite database. I want to implement the following feature: when there is new data available, clients' app will download the new data to its sqlite database automatically. I read a lot of relate posts, many people recommended that GCM is the best approach to do such function by creating a GCM server to send notification to clients' device. For example, this tutorial. However, it just display the message sent by GCM server on client's app. What should the

问题 I am following the MVVM Model. I would like to have Real-time data from SQLite database through Room (Results shall available as soon as data changes in Database). With LiveData, we can get results in Activity/Fragment. Callback also won't good on this type of requirement since data should be pushed from the database. Is there any way I can get in any class outside of activity/fragment?. Thanx in advance for your help. EDIT Putting sample code for better understanding..Is there a way to

问题 i have an android activity that use sqlite database and listview that extend baseAdapter. what i need is to display the data included in the sqlite to be displayed in the list view. the sqlite contain name of images that exist in the drawable folder. so my question how to use this listView that extend Baseadapter after getting data in the activity?? can anyone help me ?? ItemDetails.java package com.devleb.expandablelistdemo3; public class ItemDetails { String Name; int image; String stad

问题 Hi all i'm new in Android and this application is my first app for use database. in my application i have DatabaseHandler class with this simple structure public class DatabaseHandler extends SQLiteOpenHelper{ private static String DB_PATH = ""; private static final String DATABASE_NAME = "tsms"; private static String RECEIVE_FIELDS_TABLE = "ReceiveFields"; private static final String COLUMN_ID = "id"; public DatabaseHandler(Context context) { super(context, DATABASE_NAME, null, DATABASE

问题 I am new in Android Development. Currently, working with SQLite Database in Android. My problem is that I have a large amount of data which I have to store in SQLite Database in Android. There are 2 tables: One having 14927 rows and the other one has 9903 rows. Currently the database in sql. And I have copy these data in excel sheet but don't understand how can I import these data in SQLite Database. I go through the following link: Inserting large amount of data into android sqlite database?