使用SQLite

Question

我目前正准备使用MySql工作台，Visual Studio，XAMPP和MySQL连接器制作的c＃应用程序。我想在其他计算机上启用此应用程序，而无需使用如此多的程序/安装。

在做了一些研究（并在这里查看其他问题）之后，我得出结论，SQLite是最好的选择。但是，我不确定如何恰当地实现这一点。我已经查看了几个转换插件/脚本（.sql文件到sqlite数据库）但是我无法让它们正常运行。

如果有人有任何链接，他们可以指出我或有关如何实施SQLite的任何想法请告诉我！

提前致谢！

更新：好的，所以我花了一天时间尝试使我的应用程序与SQLite兼容，但是我没有成功。使用mysql数据库部署应用程序的最佳方法是什么？最终用户的工作量最少？

感谢大家的贡献！

Answer 1

转换插件/脚本也没有太多运气。我最终为我需要的少量表编写了自己的转换。这是一个使用我的表之一的简单示例，您可以根据自己的目的轻松修改：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SQLite;
using MySql.Data.MySqlClient;


namespace SampleConversion
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    private void create_SQLite_database()
    {
        string connectionString = "Data Source=" + Application.StartupPath + "\\pthData.sqlite;Version=3;";

        try
        {
            SQLiteConnection.CreateFile("pthData.sqlite");
        }
        catch (SQLiteException ex)
        {
            MessageBox.Show("Unable to create the SQLite database\n" + ex.Message + "\nConnection string: " + connectionString, "Create SQLite file/database error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1, MessageBoxOptions.ServiceNotification);
        }
        catch (Exception ex)
        {
            MessageBox.Show("Unable to create the SQLitedatabase\n" + ex.Message + "\nConnection string: " + connectionString, "Create SQLite file/database error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1, MessageBoxOptions.ServiceNotification);
        }
        // file created, now create tables
        SQLiteConnection cn = new SQLiteConnection(connectionString);
        if (cn.State == ConnectionState.Closed)
            cn.Open();

        SQLiteCommand cmd;
        string commandString = "Create table if not exists USTimeZones\n";

        // create time zones file
        commandString += "(state nvarchar(30), city nvarchar(100), county nvarchar(50), timezone nvarchar(10), ";
        commandString += "timetype int, latitude nvarchar(10), longitude nvarchar(10),  ";
        commandString += "PRIMARY KEY(state, city, county, timezone, timetype))";
        cmd = new SQLiteCommand(commandString, cn);
        try
        {
            cmd.ExecuteNonQuery();
        }
        catch (SQLiteException sqlexception)
        {
            MessageBox.Show(sqlexception.Message + "\n Command string: " + commandString, "Error creating USTimeZones", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1, MessageBoxOptions.ServiceNotification);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message + "\n Command string: " + commandString, "Error creating USTimeZoness", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1, MessageBoxOptions.ServiceNotification);
        }

    }


    private void btnMySql_Click(object sender, EventArgs e)
    {
        string cmd = "";
        int count = 0;

        create_SQLite_database(); // Create the SQLite database file and a table within it

        string MySQLconnectionString = "Server=MyServerAddress;Database=PTHData;uid=username;pwd=passwordhere;database=USTimeZones";
        string SQLiteconnectionString = "Data Source=" + Application.StartupPath + "\\pthData.sqlite;Version=3;";

        // open the input and output database
        SQLiteConnection SQLiteconnection = new SQLiteConnection(SQLiteconnectionString);
        try
        {
            SQLiteconnection.Open();
        }
        catch (SQLiteException ex)
        {
            string errorMessages = "A SQLite exception occurred on open.\n" + ex.Message;
            MessageBox.Show(errorMessages, "Convert");
            return;
        }
        MySqlConnection MySQLconnection = new MySqlConnection(MySQLconnectionString);
        try
        {
            MySQLconnection.Open();
        }
        catch (SqlException ex)
        {
            string errorMessages = "A MySQL exception occurred on open.\n" + ex.Message;
            MessageBox.Show(errorMessages, "Convert");
            return;
        }

        //Databases are not open, time to convert
        MySqlCommand cmdread = new MySqlCommand();
        cmdread.Connection = MySQLconnection;
        cmdread.CommandText = "Select * from USTimeZones";
        MySqlDataReader drread = null;

        SQLiteCommand cmdwrite = new SQLiteCommand();
        cmdwrite.Connection = SQLiteconnection;

        try
        {
            drread = cmdread.ExecuteReader();
            while (drread.Read())
            {
                drread["timezone"].ToString();
                cmd = "Insert into USTimeZones values ('" + drread["state"].ToString() + "','" +
                    drread["city"].ToString() + "','" + drread["county"].ToString() + "','" +
                    drread["timezone"].ToString() + "','" + drread["timetype"].ToString() + "','" +
                    drread["latitude"].ToString() + "','" + drread["longitude"].ToString() + "')";
                cmdwrite.CommandText = cmd;
                try
                {
                    cmdwrite.ExecuteNonQuery();
                    count++;
                }
                catch (SQLiteException ex)
                {
                    string errorMessages = "An SQL exception occurred on writing the SQLite record.\n" + ex.Message;
                    MessageBox.Show(errorMessages, "Convert");
                    SQLiteconnection.Close();
                    MySQLconnection.Close();
                    return;
                }

            }
        }
        catch (MySqlException ex)
        {
            string errorMessages = "A MySQL exception occurred reading records.\n" + ex.Message;
            MessageBox.Show(errorMessages, "Convert");
        }
        catch (Exception ex)
        {
            string errorMessages = "A General exception occurred reading records.\n" + ex.Message;
            MessageBox.Show(errorMessages, "Convert");
        }

        MessageBox.Show("Records written: " + count.ToString(), "Conversion complete");
        drread.Close();
        MySQLconnection.Close();
        SQLiteconnection.Close();

    }
}

}

还有一个“SQL Server Compact / SQLite工具箱”，您可以从Visual Studio NuGet包管理器加载，我发现它也非常有用。