C# sqlite demo.rar

sqlite demo

《C#与SQLite数据库操作详解》 SQLite是一个轻量级的、开源的、自包含的数据库引擎，常用于嵌入式系统和桌面应用程序，尤其在移动开发领域中广泛应用。本教程将通过C#语言，详细讲解如何进行SQLite数据库的创建、修改、删除以及查询等操作，帮助开发者更好地理解和运用SQLite数据库。一、SQLite数据库简介 SQLite是一个基于ACID的事务型数据库引擎，无需服务器进程，可以直接在文件系统中运行。它支持SQL标准，具有良好的跨平台性，可在Windows、Linux、Mac OS X等多种操作系统上运行。由于其体积小、速度快、无需配置的特点，被广泛应用于移动应用和小型项目。二、C#与SQLite连接在C#中，我们可以使用System.Data.SQLite库来操作SQLite数据库。需要在项目中引用这个库，可以通过NuGet包管理器安装。然后，创建SQLiteConnection对象，通过ConnectionString连接到SQLite数据库文件。 ```csharp using System.Data.SQLite; // 创建数据库连接字符串 string connectionString = "Data Source=myDatabase.db;Version=3;"; // 创建SQLite连接 SQLiteConnection connection = new SQLiteConnection(connectionString); connection.Open(); ``` 三、数据库操作 1. **创建数据库**：使用SQLiteCommand对象执行SQL语句，如CREATE DATABASE命令。 2. **创建表**：创建表的SQL语句通常包括CREATE TABLE关键字，表名，以及列定义。例如： ```csharp string createTableSql = "CREATE TABLE IF NOT EXISTS Students (Id INTEGER PRIMARY KEY AUTOINCREMENT, Name TEXT, Age INT)"; SQLiteCommand command = new SQLiteCommand(createTableSql, connection); command.ExecuteNonQuery(); ``` 3. **插入数据**：使用INSERT INTO语句，通过SQLiteCommand的ExecuteNonQuery方法执行。 4. **查询数据**：使用SELECT语句，通过SQLiteCommand的ExecuteReader方法获取SQLiteDataReader，遍历结果集。 5. **更新数据**：使用UPDATE语句，指定WHERE子句以确定更新的行。 6. **删除数据**：使用DELETE语句，同样需指定WHERE子句。 7. **索引操作**：可以使用CREATE INDEX语句创建索引，提高查询效率。例如： ```csharp string createIndexSql = "CREATE INDEX idx_Students_Name ON Students (Name)"; SQLiteCommand indexCommand = new SQLiteCommand(createIndexSql, connection); indexCommand.ExecuteNonQuery(); ``` 8. **视图操作**：视图是基于一个或多个表的虚拟表，可以使用CREATE VIEW语句创建。视图可以简化复杂的查询，也可以保护数据。例如： ```csharp string createViewSql = "CREATE VIEW StudentAges AS SELECT Name, Age FROM Students WHERE Age > 18"; SQLiteCommand viewCommand = new SQLiteCommand(createViewSql, connection); viewCommand.ExecuteNonQuery(); ``` 四、事务处理 SQLite支持事务，可以确保数据的一致性和完整性。在C#中，通过BeginTransaction、Commit和Rollback方法实现事务操作。 ```csharp connection.BeginTransaction(); try { // 执行一系列操作 connection.Commit(); } catch (Exception ex) { connection.Rollback(); throw ex; } ``` 五、总结通过C#与SQLite的结合，开发者可以在各种应用场景中轻松地进行数据库操作。无论是简单的数据存储还是复杂的业务逻辑，SQLite都能提供高效、可靠的解决方案。在实际开发中，根据需求选择合适的数据访问模式（如ADO.NET、Entity Framework等），可以进一步提升开发效率和代码质量。以上内容仅为基础操作，实际开发中可能涉及更多高级特性和优化策略，如存储过程、触发器、事务管理、并发控制等。持续学习和实践，才能更好地掌握SQLite在C#中的应用。

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