sqlite

问题 I am using Recyclerview on a fragment when i run the app and open the activity it crashes.I am new to android so i am not able to implement Recyclerview with SQlite as i followed some code on internet and implemented in my code but my app crashes log 02-25 11:53:20.362 19942-19942/com.navinkadlak.typroject E/AndroidRuntime: FATAL EXCEPTION: main Process: com.navinkadlak.typroject, PID: 19942 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.support.v7

问题 I am using Recyclerview on a fragment when i run the app and open the activity it crashes.I am new to android so i am not able to implement Recyclerview with SQlite as i followed some code on internet and implemented in my code but my app crashes log 02-25 11:53:20.362 19942-19942/com.navinkadlak.typroject E/AndroidRuntime: FATAL EXCEPTION: main Process: com.navinkadlak.typroject, PID: 19942 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.support.v7

问题 I am working on a small project. Building a text based football simulator. I have set up an database with SQLite with the basic information such as Name, Surname, Attack, Defense what I need some help with is reading the database into my C# script to be able to use these values in my existing database. In short I want to call on a player with C# and read the information in the database into a variable for me to do further calculations with. Thanks in advance. 回答1: On Windows, as well as Linux

问题 Hi i have this two tables ( not sure if they are written correctly) an agenda can contain many Tasks, my question is how do i write the methods to add/delete/load my tasks in my agenda, i am not sure how this work when you have a foreign key ? Thank you. Agenda.cs in the Models folder [Table("Agenda")] public class Agenda { [PrimaryKey, AutoIncrement] public int ID { get; set; } public string Topic { get; set; } public string Duration { get; set; } public DateTime Date { get; set; }

问题 I'm use SQLite3 to query for tile blobs I downloaded from openmaptiles. I'm able to get the blob from my DB and convert it into a Data however when I pass the Data to result of loadTile(at path:result:) I don't see the tile rendering. I'm wondering if maybe I need to convert it to some type of image data for it to render. However I'm fairly certain that .mbtiles uses blob data from png or jpeg image types which should be fine. Why might tiles not render on screen if I have appropriate Data

问题 I have a fairly basic flask set up (been coding using sublime text). For testing purposes, I am now trying to run the following .py file. It contains a query that generates the data: user_data. I am trying to see what the result of that data is. from datetime import datetime from flask import Flask, render_template, url_for import sqlite3 app = Flask(__name__) db_locale='users.db' def query_comments(): connie=sqlite3.connect(db_locale) c=connie.cursor() c.execute(""" SELECT * FROM comments ""

问题 I'm building a website with Django and I need to have a GPS coordinate attribute in my User model. I will be using GeoDjango, which needs PostgreSQL and, since my website is already working with the sqlite3 default database, I need to install a PostgreSQL database to the project in order to create a Coordinates model in it and link it to the User model of the SQLite database. I found lots of tutorials on the internet about "how to use multiple databases" but they are all very basics. Since I

问题 I'm building a website with Django and I need to have a GPS coordinate attribute in my User model. I will be using GeoDjango, which needs PostgreSQL and, since my website is already working with the sqlite3 default database, I need to install a PostgreSQL database to the project in order to create a Coordinates model in it and link it to the User model of the SQLite database. I found lots of tutorials on the internet about "how to use multiple databases" but they are all very basics. Since I

问题 I'm writing program using sqlite. I've got class dataSend_task , that periodicaly select data from BD and send it to server. In dataSend_task i've got method callback , that I want to sent as argument to sqlite3_exec . I've got error: error: cannot convert ‘std::function<int(void*, int, char**, char**)>’ to ‘int (*)(void*, int, char**, char**)’ for argument ‘3’ to ‘int sqlite3_exec(sqlite3*, const char*, int (*)(void*, int, char**, char**), void*, char**)’ if (sqlite3_exec(this->db, this->SQL

问题 I am fetching the SQLite's data in the textView and it is showing following error. I've also set permission of READ and WRITE_EXTERNAL_STORAGE in mainfest but still I'm getting this error: this is quotes.java file: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.birnepal.entrancekoguide/databases/"; private static final String Table_name = "quotes"; private static final String