https://github.com/mertjsx/csharp_sqlite_example
This project tries to explain how to use C# with SQLite in Bulgarian.
https://github.com/mertjsx/csharp_sqlite_example
csharp database dotnet education example example-code sqlite
Last synced: 13 days ago
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This project tries to explain how to use C# with SQLite in Bulgarian.
- Host: GitHub
- URL: https://github.com/mertjsx/csharp_sqlite_example
- Owner: MertJSX
- License: mit
- Created: 2025-03-04T19:52:30.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2025-03-04T21:45:04.000Z (about 1 year ago)
- Last Synced: 2025-07-10T03:52:55.951Z (10 months ago)
- Topics: csharp, database, dotnet, education, example, example-code, sqlite
- Language: C#
- Homepage:
- Size: 12.7 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Свързване на програмата с локална база данни SQLite
## Изтегляне на библиотеката [Microsoft.Data.Sqlite](https://learn.microsoft.com/en-us/dotnet/standard/data/sqlite/?tabs=visual-studio)
Отваряме *Package Manager Console* от:
```Tools > NuGet Package Manager > Package Manager Console```
Пишем командата:
```
Install-Package Microsoft.Data.Sqlite
```
## Свързване
```cs
SqliteConnection connection = new SqliteConnection("Data Source=database.db"); // name of file
connection.Open();
```
## Място на съхранение на базата данни
Базата данни се съхранява като файл. В този случай може да го намерим в
```
(Директория на проект)\bin\Debug\net8.0\database.db
```
Разширението на файла завършва с **.db**
Може да го отворим с различни инструменти като най-лесен пример:
- Да използваме extension на **Visual Studio Code**
- Да използваме уеб инструмент като [SQLite Viewer](https://sqliteviewer.app/)
## Създаване на таблица
След свързването продължаваме, като създаваме таблицата, ако не съществува. Затова може да добавим "IF NOT EXISTS" след "CREATE TABLE":
```cs
SqliteCommand createTableCommand = connection.CreateCommand();
createTableCommand.CommandText =
@"CREATE TABLE IF NOT EXISTS users (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
username TEXT,
email TEXT,
password TEXT);";
createTableCommand.ExecuteNonQuery();
```
## Добавяне на нов запис
Като имаме готова таблица **users** може да добавим нови записи или потребители в нашия случай. Използваме така наречени **placeholders**, за да избегнем [SQL Inject](https://www.w3schools.com/sql/sql_injection.asp) атаките. Например "@uname", "@email", "@pass":
```cs
SqliteCommand insertCommand = connection.CreateCommand();
insertCommand.CommandText =
@"INSERT INTO users(username, email, password)
VALUES(@uname, @email, @pass);";
Console.Write("Please enter name to insert: ");
insertCommand.Parameters.AddWithValue("@uname", Console.ReadLine());
Console.Write("Please enter email to insert: ");
insertCommand.Parameters.AddWithValue("@email", Console.ReadLine());
Console.Write("Please enter password to insert: ");
insertCommand.Parameters.AddWithValue("@pass", Console.ReadLine());
insertCommand.ExecuteNonQuery();
```
## Извличане на данни
```cs
SqliteCommand selectCommand = connection.CreateCommand();
selectCommand.CommandText =
@"SELECT username, email, password
FROM users
WHERE username = @name";
Console.Write("Please enter name to search: ");
selectCommand.Parameters.AddWithValue("@name", Console.ReadLine());
SqliteDataReader reader = selectCommand.ExecuteReader();
while (reader.Read())
{
string userName = reader.GetString(0);
string userEmail = reader.GetString(1);
string userPassword = reader.GetString(2);
Console.WriteLine("Hello, " + userName + "!");
Console.WriteLine("Your email is " + userEmail);
Console.WriteLine("Your password is " + userPassword);
}
reader.Close();
```
## Пример с UPDATE заявка
```cs
SqliteCommand updateCommand = connection.CreateCommand();
updateCommand.CommandText =
@"UPDATE users SET email = @email
WHERE username = @username";
Console.Write("Enter name to change email: ");
updateCommand.Parameters.AddWithValue("@username", Console.ReadLine());
Console.Write("Enter new email: ");
updateCommand.Parameters.AddWithValue("@email", Console.ReadLine());
updateCommand.ExecuteNonQuery();
```