请使用 Microsoft.Data.Sqlite 来编写针对Sqlite数据访问帮助类，至少拥有对DataTable、DataSet格式的支持

好的，下面是一个简单的 Sqlite 数据访问帮助类，它使用 Microsoft.Data.Sqlite 库来实现对 Sqlite 数据库的基本操作，并支持将查询结果转换为 DataTable 和 DataSet 格式：

using Microsoft.Data.Sqlite;
using System.Data;

public class SqliteHelper
{
    private string connectionString;

    public SqliteHelper(string connectionString)
    {
        this.connectionString = connectionString;
    }

    public DataTable ExecuteQuery(string sql, params SqliteParameter[] parameters)
    {
        using (var connection = new SqliteConnection(connectionString))
        {
            connection.Open();
            using (var command = new SqliteCommand(sql, connection))
            {
                command.Parameters.AddRange(parameters);
                using (var reader = command.ExecuteReader())
                {
                    var dataTable = new DataTable();
                    dataTable.Load(reader);
                    return dataTable;
                }
            }
        }
    }

    public DataSet ExecuteQueryDataSet(string sql, params SqliteParameter[] parameters)
    {
        using (var connection = new SqliteConnection(connectionString))
        {
            connection.Open();
            using (var command = new SqliteCommand(sql, connection))
            {
                command.Parameters.AddRange(parameters);
                using (var adapter = new SqliteDataAdapter(command))
                {
                    var dataSet = new DataSet();
                    adapter.Fill(dataSet);
                    return dataSet;
                }
            }
        }
    }

    public int ExecuteNonQuery(string sql, params SqliteParameter[] parameters)
    {
        using (var connection = new SqliteConnection(connectionString))
        {
            connection.Open();
            using (var command = new SqliteCommand(sql, connection))
            {
                command.Parameters.AddRange(parameters);
                return command.ExecuteNonQuery();
            }
        }
    }
}

使用示例：

// 创建 SqliteHelper 实例
var helper = new SqliteHelper("Data Source=mydb.db");

// 执行查询并转换为 DataTable
var dataTable = helper.ExecuteQuery("SELECT * FROM mytable WHERE id = @id", new SqliteParameter("@id", 1));

// 执行查询并转换为 DataSet
var dataSet = helper.ExecuteQueryDataSet("SELECT * FROM mytable");

// 执行非查询语句
var rowsAffected = helper.ExecuteNonQuery("UPDATE mytable SET name = @name WHERE id = @id", 
    new SqliteParameter("@name", "new name"), new SqliteParameter("@id", 1));

注意需要在项目中安装 Microsoft.Data.Sqlite 库，可以使用 NuGet 进行安装。