sqlite

Ruby on Rails - sqlite 3 rake migrations not updating the database

由 ↘锁芯ラ 提交于 2020-01-14 05:26:40
问题 I am using RoR (3.2.2) and SQLite 3 (1.3.5). When I initially generate a model I am able to successfully create a database. However, whenever I try to use the migration generator it appears to not have any issues in the command line (no errors), but when I check the database nothing has updated or changed. For example, I create this database: $ rails generate model User name:string email:string db/migrate/[timestamp]_create_users.rb class CreateUsers < ActiveRecord::Migration def change

how to fetch data from sqlite table and display it in textview in android?

由 ε祈祈猫儿з 提交于 2020-01-14 05:13:13
问题 I have been working on some sqlite database and i have created one table,and have successfully inserted data,How to fetch the data and display in a textview? public class EmployeeTable{ public static final String KEY_NAME = "emp_name"; public static final String KEY_DESIGNATION = "emp_designation"; public static final String KEY_ROWID = "_id"; private static final String TAG = "EmployeeTable"; private DatabaseHelper mDbHelper; private SQLiteDatabase mDb; private static final String DATABASE

Reload View and Controller in Ionic Framework

由 荒凉一梦 提交于 2020-01-14 04:59:25
问题 I am building up an mobile application using Ionic Framework and Cordova Sqlite. I am displaying the data from the sqlite database in an ionic list. Each of the ionic list item has a button to delete the corresponding item from the database. On the click of the button, the data gets deleted from the database, but it continues to appear in the ionic list, until I go back to some other view and come back to it. I need to refresh the view immediately and remove that item from the list also. Also

Android upgrade db not updating db version after successful upgrade

由 房东的猫 提交于 2020-01-14 04:10:06
问题 I am trying to add three new table to my existing sqlite db and I'm running into problems with the db version not updating after a successful upgrade. Below is the DatabaseHelper that runs: private static class DatabaseHelper extends SQLiteOpenHelper { public DatabaseHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase db) { Log.w(TAG, "Current db version is " + db.getVersion()); db

Wrong sql script generated for sqlite database by ebean in the Play framework

由 孤街醉人 提交于 2020-01-14 03:45:08
问题 I am using the play framework 2.1 and using the evolution to automatically generate sql scripts for me. The database I use is sqlite3. It seems the evolution can't generate correct script for sqlite3. The incorrect script I got is: create table algorithm ( id bigint AUTOINCREMENT primary key, name varchar(255), description varchar(255)) ; I am new to sqlite3. By searching online I realized that: autoincrement can only works with Integer autoincrement should be placed after primary key So

Inserting string to SQLite using Android

由 北战南征 提交于 2020-01-14 03:24:08
问题 How do we insert strings that have commas (,) in them into SQLite database using Android ? If there are no commas within the values to be inserted, then insertion happens fine. Say for example see the Android code:- db.execSQL("insert into Student ( id, name, mark ) values (1, 'Geevarghese', 100)"); Inserting into the db works well. If I modify my question to add the address to the database, like the following, db.execSQL("insert into Student ( id, name, mark, address ) values (1,

Why could select_for_update simply be ignored with databases that don't support it?

由 大兔子大兔子 提交于 2020-01-14 02:58:04
问题 The Django docs for select_for_update say Using select_for_update() on backends which do not support SELECT ... FOR UPDATE (such as SQLite) will have no effect. SELECT ... FOR UPDATE will not be added to the query, and an error isn’t raised if select_for_update() is used in autocommit mode. This strikes me as an odd and potentially dangerous decision, especially since select_for_update is used to lock rows. If I write code that uses select_for_update , I would rely on it actually being

SQLite database leak found

由 拜拜、爱过 提交于 2020-01-13 20:18:14
问题 I'm creating an application. I'm getting this error: 11-08 13:46:24.665: ERROR/Database(443): java.lang.IllegalStateException: /data/data/com.testproj/databases/Testdb SQLiteDatabase created and never closed I can't seem to find the reason for this, as it somethimes shows me the error, sometimes not. Here is my code: public class SQLiteAssistant extends SQLiteOpenHelper { public SQLiteAssistant(Context context){ super(context, DB_NAME, null, DB_VERSION_NUMBER); this.myContext = context; }

Android学习之SQLite的基本使用

由 雨燕双飞 提交于 2020-01-13 20:10:19
本文主要是针对于初学者使用。 AndroidStudio使用版本： Android Studio 3.5 Build #AI-191.8026.42.35.5791312, built on August 9, 2019 JRE: 1.8.0_202-release-1483-b03 amd64 JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o Windows 7 6.1 Android手机测试版本：Android6.0，华为荣耀6 本博文的实现功能：通过输入Activity，保存输入数据进入SQLite数据库，然后通过宁一个Activity显示出SQLite中的数据信息。 （一）、 在手机上进行数据库的开发，基本步骤主要是以下几步，数据库名： record.db，数据表名：personinfo_record ： 1、创建数据库： 创建数据库需要继承SQLiteOpenHelper这个抽象类。 本文中使用的方法是普遍使用方法，可以借鉴。如下： public class DBHelperSub extends SQLiteOpenHelper implements Serializable { private String dbName; private Context context; private SQLiteDatabase

SQLite Insert Statement with C++

由 廉价感情. 提交于 2020-01-13 20:00:51
问题 Below is the code I have tried on a test2.cpp I checked my database and found out no new record had been added. What actually went wrong in my statement? #include <iostream> #include <sqlite3.h> //g++ -o test2 test2.cpp -lsqlite3 using namespace std; int main() { int counter = 0; sqlite3 *db; sqlite3_stmt * stmt; string username = "panda"; string name = "Kungfu Panda"; string department = "normal"; string password = "hellopassword"; string sqlstatement = "INSERT INTO abe_account (" + username
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