sqlite

Visual Studio 2017:SQLite/SQL Server Compact ToolBox使用

妖精的绣舞 提交于 2020-02-04 15:14:59
1.首先是下载安装插件:SQLite/SQL Server Compact Toolbox,也可以从工具-->扩展和更新-->联机-->搜索:SQLite/SQL Server Compact Toolbox,附下载地址:https://marketplace.visualstudio.com/items?itemName=ErikEJ.SQLServerCompactSQLiteToolbox 2.重启Visual Studio 2017,在选择数据源的时候就可以选择SQLite了,但是连接的时候会报错,因为没有安装SQLite的DataProvider,所以还要再安装一个插件dotConnect ADO.NET Data Provider for SQLite,安装步骤同上,附下载地址:https://marketplace.visualstudio.com/items?itemName=DevartSoftware.dotConnectADONETDataProviderforSQLiteStandardEditi 3.然后重启Visual Studio 2017即可。 注:sql server 2012开始, Sql Server Compact Edition被移到VS里面去了,VS里面有个localdb就是他了 来源: https://www.cnblogs.com

sqlite - how to escape semicolons in a string in an insert statement [closed]

人盡茶涼 提交于 2020-02-04 14:40:10
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . EDIT: Problem solved... and unrelated to the phrasing of the question... sorry for the waste of time :-\ I realize that typically you'd want to use some

sqlite - how to escape semicolons in a string in an insert statement [closed]

我的梦境 提交于 2020-02-04 14:39:19
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . EDIT: Problem solved... and unrelated to the phrasing of the question... sorry for the waste of time :-\ I realize that typically you'd want to use some

Unable to upload image to Django Project, getting Form object has no attribute 'save'

怎甘沉沦 提交于 2020-02-04 03:53:18
问题 I am trying to upload an image file through a file input from a template. I have followed all the instructions but getting this error when attaching the file and clicking on submit. AttributeError: 'PicUpForm' object has no attribute 'save' and hence my image is not uploading to the specified directory as well as the record is not inserting into my sqlitedb FOLLOWING ARE ALL THE NECESSARY CODES I HAVE USED: views.py def add_image(request): form = PicUpForm() if request.method == "POST": form

应用EF访问SQLite数据

非 Y 不嫁゛ 提交于 2020-02-04 02:19:36
创建项目,应用EF访问SQLite 1、创建项目 项目结构初始结构如下图所示,Netage.Data.SQLite 类库项目用于定义访问数据的接口和方法,Netage.SQLiteTest.UI 控制台项目引用 Netage.Data.SQLite 类库,调用其相应的方法来访问数据。 2、在项目中加入SQLite类库 右键 Netage.Data.SQLite 项目,选择"Manage Nuget Packages"菜单,在输入框中输入"System.Data.SQLite",查询到"System.Data.SQLite(x86/x64)",并单击安装。如图所示: 安装完成后,在"Netage.Data.SQLite"项目中就引入了相应的类库。 3、定义数据上下文及相应的实体类 public class MyContext : DbContext { public DbSet<Person> Persons { get; set; } public MyContext() : base("SqliteTest") { } } public class Person { public int Id { get; set; } public string Name { get; set; } public DateTime BirthDay { get; set; } } 4

Python基础知识学习(十六)——Python操作SQLite

浪尽此生 提交于 2020-02-03 11:55:59
目录 1.SQLite数据库的基本使用 2.Pycharm连接数据库 3.在Python中使用SQLite(sqlit3模块) 上节课我们知道了可以将数据存储在csv、json、excel文件并且介绍了Python操作文件的方法,但当项目规模扩大后,仅仅使用文件存储数据满足不了项目的需求。这时就需要使用数据库。 数据库管理系统DBMS(Database Management System)是一种操纵和管理数据库的大型软件,用于建立、使用和维护数据库。数据库管理系统应用于大型项目是用户与数据之间交互的途径。 1.SQLite数据库的基本使用 本节课主要介绍SQLite这个数据库,可使用SQLite Expert Professional软件,同时在Pycharm中也集成了这个数据库。 SQLite数据库是动态类型的,它仅有五种类型,可以动态的适应其他数据库中的字段。 NULL 空字段 INTEGER 整型(包含short int long...) REAL 浮点型(包含float double decimal...) TEXT 字符型(包含char string varchar navchar) BLOB 二进制型 SQL语句: 查询全部字段—SELECT * FROM 表 插入字段——INSERT INTO 表 (字段1,字段2...) values (值1,值2...) 修改字段

SQL logic error or missing database no such table when deleting from database

这一生的挚爱 提交于 2020-02-03 08:24:02
问题 My connection: Public con As SQLiteConnection = New SQLiteConnection("Data Source=trancebeats.s3db") and I open connection when form load Insert new value: Public Sub InsertNewCatSub() prUpdate.Value = 0 prUpdate.Maximum = 1 lblUpdateResults.Text = prUpdate.Value & " of " & prUpdate.Maximum & " Checked" lblUpdateResults.ForeColor = Color.Red TotUpd = 0 TotNew = 0 Dim filename1 = Path.GetFileNameWithoutExtension(NewCat) Dim filename2 = filename1.Replace("[", "") Dim filename3 = filename2

SQL logic error or missing database no such table when deleting from database

雨燕双飞 提交于 2020-02-03 08:22:26
问题 My connection: Public con As SQLiteConnection = New SQLiteConnection("Data Source=trancebeats.s3db") and I open connection when form load Insert new value: Public Sub InsertNewCatSub() prUpdate.Value = 0 prUpdate.Maximum = 1 lblUpdateResults.Text = prUpdate.Value & " of " & prUpdate.Maximum & " Checked" lblUpdateResults.ForeColor = Color.Red TotUpd = 0 TotNew = 0 Dim filename1 = Path.GetFileNameWithoutExtension(NewCat) Dim filename2 = filename1.Replace("[", "") Dim filename3 = filename2

SQL logic error or missing database no such table when deleting from database

此生再无相见时 提交于 2020-02-03 08:22:24
问题 My connection: Public con As SQLiteConnection = New SQLiteConnection("Data Source=trancebeats.s3db") and I open connection when form load Insert new value: Public Sub InsertNewCatSub() prUpdate.Value = 0 prUpdate.Maximum = 1 lblUpdateResults.Text = prUpdate.Value & " of " & prUpdate.Maximum & " Checked" lblUpdateResults.ForeColor = Color.Red TotUpd = 0 TotNew = 0 Dim filename1 = Path.GetFileNameWithoutExtension(NewCat) Dim filename2 = filename1.Replace("[", "") Dim filename3 = filename2