sqlite

问题 DataBase movies.db tables directors (movie_id, person_id) movies (id, title, year) people (id, name, birth) ratings (movie_id, rating, votes) stars (movie_id, person_id) you can download the database . Question I'm new in programming, so I decided, to begin with, CS50 Harvard course here is the problem and the test solution: In 13.sql, write a SQL query to list the names of all people who starred in a movie in which Kevin Bacon also starred. Your query should output a table with a single

问题 DataBase movies.db tables directors (movie_id, person_id) movies (id, title, year) people (id, name, birth) ratings (movie_id, rating, votes) stars (movie_id, person_id) you can download the database . Question I'm new in programming, so I decided, to begin with, CS50 Harvard course here is the problem and the test solution: In 13.sql, write a SQL query to list the names of all people who starred in a movie in which Kevin Bacon also starred. Your query should output a table with a single

问题 I have ConsoleApplication on .NET Core and also i added my DbContext to dependencies, but howewer i have an error: Unable to create an object of type 'MyContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728 i've added: var context = host.Services.GetRequiredService<MyContext>(); Also i've added private readonly DbContextOptions<MyContext> _opts; in my Post Class: using (MyContext db = new MyContext(_opts)) { db.Posts.Add(postData);

问题 I'm getting an error from an sqlite3 query for which I can't find any reference material. Googling the string takes me deep in the sqlite code itself, and that's so opaque I can't make heads or tails of it. The table schema: CREATE TABLE quote ( seqnum INTEGER, session STRING, timestamp_sip INTEGER, timestamp_1 INTEGER, market_center STRING, symbol STRING, bid_price INTEGER, bid_lots INTEGER, offer_price INTEGER, offer_lots INTEGER, flags INTEGER, PRIMARY KEY (symbol, seqnum) ); The query:

问题 If I have some sample data, how do I put it into SQLite (preferably fully automated)? {"uri":"/","user_agent":"example1"} {"uri":"/foobar","user_agent":"example1"} {"uri":"/","user_agent":"example2"} {"uri":"/foobar","user_agent":"example3"} 回答1: I found the easiest way to do this is by using jq and CSV as an intermediary format. Edit : as pointed out (thanks @Leo), the original question did show newline delimited JSON objects, which each on their own conform to rfc4627, but not all together

问题 I try to use optimistic concurrency check in EF Core with SQLite. The simplest positive scenario (even without concurrency itself) gives me Microsoft.EntityFrameworkCore.DbUpdateConcurrencyException: 'Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded . Entity: public class Blog { public Guid Id { get; set; } public string Name { get; set; } public byte[] Timestamp { get; set; } } Context: internal

问题 I am moving my Django code from 2.1.7 directly to the new Django 2.2. The only problem I encountered in my Centos7 development environment was that my local development database (sqlite3) version was incompatible using my Python 3.6.7. The error I was getting from "manage.py runserver" was: django.core.exceptions.ImproperlyConfigured: SQLite 3.8.3 or later I am unable to use another version of Python because this is the maximum supported by AWS elasticbeanstalk. The Python 3.6.7 seems to come

问题 I have sqLite databasae with quotes in it. I want to fetch those text in the textview randomly. this is my java class for database: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.app.materialwallpaper/databases/"; private static final String Table_name = "quotes"; private static final String quotes = "quotes"; private static final String uid = "_id"; private static final int

问题 I have sqLite databasae with quotes in it. I want to fetch those text in the textview randomly. this is my java class for database: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.app.materialwallpaper/databases/"; private static final String Table_name = "quotes"; private static final String quotes = "quotes"; private static final String uid = "_id"; private static final int

问题 I'm trying to get the questions from the SqLite for the quiz. I am getting unknowing error. I'm not understanding how to solve that error and how I got that. I'm getting stuck in this since many days. go through many docs but it is not helping to solve the error. This is my DBHelper: public class DBHelper extends SQLiteOpenHelper { private String packageName; private static final String db_name = "quiz_db.db"; private String db_path; private static int db_version = 1; Context con; public