sqlite

分享5个免费的在线 SQL 数据库环境，简直太方便了！

由 拜拜、爱过 提交于 2021-02-11 13:18:11
关注我 们, 设为星标,每天7:30不见不散,架构路上与您共享 回复" 架构师 "获取资源 今天给大家分享几个在线的免费 SQL 运行环境，也就是在线数据库。这些网站可以帮助我们快速运行一些 SQL 语句的测试或者验证，同时还可以在网络上进行分享，关键不需要自己安装数据库。 SQL Fiddle SQL Fiddle 提供了 MySQL、Oracle、PostgreSQL、SQLite 以及 SQL Server 数据库环境，使用时无需注册。 其中，左侧文本框用于输入初始化语句创建表结构和数据，点击“Build Schema📥”运行；也可以通过“Text to DDL”将格式化文本转换为 DDL 语句。右侧文本框用于输入 SQL 语句，点击“Run SQL▶️”执行，执行结果显示在页面下方；“Run SQL▶️”可以选择输出结果的格式，包括表格、普通文本 以及 Markdown 三种格式。 另外，复制网页地址可以分享本次测试的数据和结果，以上截图的地址为：http://sqlfiddle.com/#!9/a6c585/1。 DB Fiddle DB Fiddle 提供了 MySQL、PostgreSQL 以及 SQLite 数据库的 最新版本 ，使用时无需注册，同时也提供了付费版本。 其中，最左侧文本框可以输入本次测试的标题和描述。中间文本框用于输入初始化语句，点击“▶️Run

分享5个免费的在线 SQL 数据库环境，简直太方便了！

由 时光毁灭记忆、已成空白 提交于 2021-02-11 13:06:02
点击上方蓝色“ 程序猿DD ”，选择“设为星标” 回复“ 资源 ”获取独家整理的学习资料！ 作者 | 不剪发的Tony老师 来源 | blog.csdn.net/horses/article/details/108603935 大今天给大家分享几个在线的免费 SQL 运行环境，也就是在线数据库。这些网站可以帮助我们快速运行一些 SQL 语句的测试或者验证，同时还可以在网络上进行分享，关键不需要自己安装数据库。 SQL Fiddle SQL Fiddle 提供了 MySQL、Oracle、PostgreSQL、SQLite 以及 SQL Server 数据库环境，使用时无需注册。 SQL Fiddle 其中，左侧文本框用于输入初始化语句创建表结构和数据，点击“Build Schema📥”运行；也可以通过“Text to DDL”将格式化文本转换为 DDL 语句。 右侧文本框用于输入 SQL 语句，点击“Run SQL▶️”执行，执行结果显示在页面下方；“Run SQL▶️”可以选择输出结果的格式，包括表格、普通文本 以及 Markdown 三种格式。 另外，复制网页地址可以分享本次测试的数据和结果，以上截图的地址为：http://sqlfiddle.com/#!9/a6c585/1。 地址：http://sqlfiddle.com/ DB Fiddle DB Fiddle 提供了

update Flaw in My python tkinter sqlite application

由 て烟熏妆下的殇ゞ 提交于 2021-02-11 12:50:30
问题 i a beginner and i am trying to make a blood sugar tracking application using python Tkinter and Sqlite, so the problem is that after "selecting" a row from treeview widget and "updating" its values the Blue highlight no longer exists but the data is stored and if the "UPDATE" button/function is clicked again even without selecting a row from treeview the values on the previously selected row get updated. import numpy as np from tkinter import * from tkinter import messagebox from tkinter

update Flaw in My python tkinter sqlite application

由 荒凉一梦 提交于 2021-02-11 12:50:22
问题 i a beginner and i am trying to make a blood sugar tracking application using python Tkinter and Sqlite, so the problem is that after "selecting" a row from treeview widget and "updating" its values the Blue highlight no longer exists but the data is stored and if the "UPDATE" button/function is clicked again even without selecting a row from treeview the values on the previously selected row get updated. import numpy as np from tkinter import * from tkinter import messagebox from tkinter

SQL: grouping to have exact rows

由 拈花ヽ惹草 提交于 2021-02-11 12:42:37
问题 Let's say there is a schema: |date|value| DBMS is SQLite. I want to get N groups and calculate AVG(value) for each of them. Sample: 2020-01-01 10:00|2.0 2020-01-01 11:00|2.0 2020-01-01 12:00|3.0 2020-01-01 13:00|10.0 2020-01-01 14:00|2.0 2020-01-01 15:00|3.0 2020-01-01 16:00|11.0 2020-01-01 17:00|2.0 2020-01-01 18:00|3.0 Result (N=3): 2020-01-01 11:00|7.0/3 2020-01-01 14:00|15.0/3 2020-01-01 17:00|16.0/3 I need to use a windowing function, like NTILE, but it seems NTILE is not usable after

Sandbox Sqlite with EF Core

由 戏子无情 提交于 2021-02-11 12:29:20
问题 I'm making a small web app which currently is using sqlite + EF Core 2.1 for storing data. Are there any solutions that I can sandbox my sqlite database file ? I mean to load my sqlite database with its data and triggers from my physical db file into memory. Everytime when I turn on/off VS debugger, database will be refreshed with my existing data in physical file . Thank you, 回答1: Here's some code that literally does what you asked: var sandboxConnection = new SqliteConnection("Data Source=

iPhone as Xcode simulator doesn't read from sqlite database

由 徘徊边缘 提交于 2021-02-11 09:10:42
问题 I have coded an app that utilizes the sqlite database that ships with Xcode. It works well on the mac but when I select iPhone as simulator the app (on iPhone) doesn't read database data. Do I need to code access to the sqlite database differently from how it accesses it on the mac? Here is my function to get data from a database that is used in a picker view. This picker view does not populate when I use an iPhone (linked to the computer via usb). However it populates when I run any of the

iPhone as Xcode simulator doesn't read from sqlite database

由 时光毁灭记忆、已成空白 提交于 2021-02-11 09:07:09
问题 I have coded an app that utilizes the sqlite database that ships with Xcode. It works well on the mac but when I select iPhone as simulator the app (on iPhone) doesn't read database data. Do I need to code access to the sqlite database differently from how it accesses it on the mac? Here is my function to get data from a database that is used in a picker view. This picker view does not populate when I use an iPhone (linked to the computer via usb). However it populates when I run any of the

Check if contact has been changed on android native contacts to update my db (sqlite)

由 那年仲夏 提交于 2021-02-11 08:46:26
问题 Im developing a birthday reminder android app. I retrieve all phone contacts and store in sqlite (name, phone, birthdate). My question is if I can check if user, for example, changes contact name or phone apply this update to my sqlite database. Do android contacts have any id or something? Thanks! EDIT: I need to store in a new database table because I have a column 'msg' which sends automatically and SMS if today is someone's birthday. 回答1: To answer you question, you can see the

How to update specific data into SQLite in Xamarin

由 感情迁移 提交于 2021-02-11 08:12:01
问题 I have created a database using SQLite which store student details including Student Name (String) Student Password (String) Student ID (String) Student Attendance(Boolean) In my solution, there are 3 view controller as describe below: ViewController1 : Table View, Display List of Students. ViewController2 : Normal View Controller with 3 text field and 1 switch button to get all 4 user detail. ViewController3 : A button that enable user to tap, and turn the attendance (boolean) to on. I would
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