sqlite

Add data to many-to-many relation with one SQL command

由 删除回忆录丶 提交于 2021-01-01 08:12:18
问题 I have a basic understanding of SQL databases and I might overlooked something, but I cannot figure out the following problem: there is a many-to-many relationship (for example: users - user_roles - roles). Is it possible to add (new) role to a (new) user with one SQL command (atomic operation)? Currently I use Sqlite. I am aware of the SELECT last_insert_rowid(); command and with this and several SQL commands I can achieve what I want. But I want to incorporate it into one command (so the

Add data to many-to-many relation with one SQL command

由 北城余情 提交于 2021-01-01 08:11:54
问题 I have a basic understanding of SQL databases and I might overlooked something, but I cannot figure out the following problem: there is a many-to-many relationship (for example: users - user_roles - roles). Is it possible to add (new) role to a (new) user with one SQL command (atomic operation)? Currently I use Sqlite. I am aware of the SELECT last_insert_rowid(); command and with this and several SQL commands I can achieve what I want. But I want to incorporate it into one command (so the

.NET 5 excludes some libraries from single file publication

由 て烟熏妆下的殇ゞ 提交于 2020-12-31 16:46:54
问题 I have a little problem with single file executable publish with .NET 5. Infact, it does not include all libraries in the executable file, and produces multiple files. In my example I'm using a library for SQLite (Microsoft.Data.Sqlite) and, after compilation, e_sqlite3.dll is not included. Instead, in the output folder, it produces two files (excluding the pdb file): > e_sqlite3.dll > WpfApp1.exe 回答1: By reading documentation Single-file doesn't bundle native libraries by default. On Linux,

.NET 5 excludes some libraries from single file publication

由 拥有回忆 提交于 2020-12-31 16:42:30
问题 I have a little problem with single file executable publish with .NET 5. Infact, it does not include all libraries in the executable file, and produces multiple files. In my example I'm using a library for SQLite (Microsoft.Data.Sqlite) and, after compilation, e_sqlite3.dll is not included. Instead, in the output folder, it produces two files (excluding the pdb file): > e_sqlite3.dll > WpfApp1.exe 回答1: By reading documentation Single-file doesn't bundle native libraries by default. On Linux,

.NET 5 excludes some libraries from single file publication

由 你离开我真会死。 提交于 2020-12-31 16:37:16
问题 I have a little problem with single file executable publish with .NET 5. Infact, it does not include all libraries in the executable file, and produces multiple files. In my example I'm using a library for SQLite (Microsoft.Data.Sqlite) and, after compilation, e_sqlite3.dll is not included. Instead, in the output folder, it produces two files (excluding the pdb file): > e_sqlite3.dll > WpfApp1.exe 回答1: By reading documentation Single-file doesn't bundle native libraries by default. On Linux,

python17-Django基础(一)

由 百般思念 提交于 2020-12-31 06:00:54
知识预览 一 Django基本命令 二 路由配置系统（URLconf） 三 编写视图 四 Template 五 数据库与ORM admin的配置 一 什么是web框架？ 框架，即framework，特指为解决一个开放性问题而设计的具有一定约束性的支撑结构，使用框架可以帮你快速开发特定的系统，简单地说，就是你用别人搭建好的舞台来做表演。 对于所有的Web应用，本质上其实就是一个socket服务端，用户的浏览器其实就是一个socket客户端。 import socket def handle_request(client): buf = client.recv(1024 ) client.send( " HTTP/1.1 200 OK\r\n\r\n " .encode( " utf8 " )) client.send( " <h1 style='color:red'>Hello, yuan</h1> " .encode( " utf8 " )) def main(): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.bind(( ' localhost ' ,8001 )) sock.listen( 5 ) while True: connection, address = sock.accept()

Pre-packaged database has an invalid schema error

由 烈酒焚心 提交于 2020-12-31 04:30:55
问题 I'm building an Android application based on an old Android project. In my new application I'm using Room. I have to use the same database that is used in the first project. Furthermore, I've extracted the database from the first project using com.amitshekhar.android:debug-db library. After obtaining the database file I would like to open it with the Room. I am building database like this: Room.databaseBuilder( androidContext(), Database::class.java, "database.db" ).createFromAsset("database

Pre-packaged database has an invalid schema error

由 断了今生、忘了曾经 提交于 2020-12-31 04:30:20
问题 I'm building an Android application based on an old Android project. In my new application I'm using Room. I have to use the same database that is used in the first project. Furthermore, I've extracted the database from the first project using com.amitshekhar.android:debug-db library. After obtaining the database file I would like to open it with the Room. I am building database like this: Room.databaseBuilder( androidContext(), Database::class.java, "database.db" ).createFromAsset("database

How do I call SQLitePCL.Batteries.Init().?

由 六月ゝ 毕业季﹏ 提交于 2020-12-30 04:52:23
问题 I am attempting to create an SQLite database for my application and have come across this error. System.Exception: 'You need to call SQLitePCL.raw.SetProvider(). If you are using a bundle package, this is done by calling SQLitePCL.Batteries.Init().' I created a simple console app the run the exact same code for creation, with no issues. The code looks like this! using (var dataContext = new SampleDBContext()) { dataContext.Accounts.Add(new Account() { AccountName = name, AccountBalance =

How do I call SQLitePCL.Batteries.Init().?

由 不想你离开。 提交于 2020-12-30 04:51:30
问题 I am attempting to create an SQLite database for my application and have come across this error. System.Exception: 'You need to call SQLitePCL.raw.SetProvider(). If you are using a bundle package, this is done by calling SQLitePCL.Batteries.Init().' I created a simple console app the run the exact same code for creation, with no issues. The code looks like this! using (var dataContext = new SampleDBContext()) { dataContext.Accounts.Add(new Account() { AccountName = name, AccountBalance =
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