一、如要使用SQLite，可以从Visual Studio中的“程序包管理器控制台”输入以下命令完成安装：
PM> Install-Package System.Data.SQLite.Core
SQLite则会安装到项目中，支持32位或64位，如下图所示：
二、新建一个SQLite数据库，名称命名为Test.db，其表名称及列定义如下：
三、新建一个控制台应用的解决方案，并输入以下代码，看看SQLite的执行时间：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Diagnostics;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
SQLiteConnection connection = Run(() => new SQLiteConnection("Data Source = Test.db"), "连接对象初始化");
Run(() => connection.Open(), "打开连接");
SQLiteCommand command = Run(() => new SQLiteCommand(connection), "命令对象初始化");
Run(() =>
{
command.CommandText = $"DELETE FROM Info;VACUUM;UPDATE sqlite_sequence SET seq ='0' where name ='Info';";
command.ExecuteNonQuery();
}, "执行DELETE命令及收缩数据库");
Run(() =>
{
for (int i = 0; i < 3000; i++)
{
command.CommandText = $"INSERT INTO Info(Name, Age) VALUES ('A{i:000}','{i}')";
command.ExecuteNonQuery();
}
command.ExecuteScalar();
}, "[---使用事务---]事务执行INSERT命令");
List<Test> list1 = Run(() =>
{
command.CommandText = $"SELECT * FROM Info";
List<Test> tests = new List<Test>();
SQLiteDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Test t = new Test
{
ID = (long)reader[0],
Name = (string)reader[1],
Age = (long)reader[2]
};
tests.Add(t);
}
reader.Close();
return tests;
}, "[---不使用事务---]使用ExecuteReader方式执行SELECT命令");
DataTable table1 = Run(() =>
{
command.CommandText = $"SELECT * FROM Info";
SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
DataTable _table = new DataTable();
adapter.Fill(_table);
return _table;
}, "[---不使用事务---]使用Fill Table方式执行SELECT命令");
Run(() =>
{
command.CommandText = $"DELETE FROM Info;VACUUM;UPDATE sqlite_sequence SET seq ='0' where name ='Info';";
command.ExecuteNonQuery();
}, "执行DELETE命令及收缩数据库");
SQLiteTransaction transaction = Run(() => connection.BeginTransaction(), "开始事务");
Run(() =>
{
for (int i = 0; i < 3000; i++)
{
command.CommandText = $"INSERT INTO Info(Name, Age) VALUES ('A{i:000}','{i}')";
command.ExecuteNonQuery();
}
var result = command.ExecuteScalar();
}, "[---使用事务---]执行INSERT命令");
List<Test> list2 = Run(() =>
{
command.CommandText = $"SELECT * FROM Info";
List<Test> tests = new List<Test>();
SQLiteDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Test t = new Test
{
ID = (long)reader[0],
Name = (string)reader[1],
Age = (long)reader[2]
};
tests.Add(t);
}
reader.Close();
return tests;
}, "[---使用事务---]使用ExecuteReader方式执行SELECT命令");
DataTable table2 = Run(() =>
{
command.CommandText = $"SELECT * FROM Info";
SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
DataTable _table = new DataTable();
adapter.Fill(_table);
return _table;
}, "[---使用事务---]使用Fill Table方式执行SELECT命令");
Run(() => transaction.Commit(), "提交事务");
Run(() => connection.Close(), "关闭连接");
Console.ReadKey();
}
public static void Run(Action action,string description)
{
Stopwatch sw = Stopwatch.StartNew();
action();
Console.WriteLine($"--> {description}: {sw.ElapsedMilliseconds}ms");
}
public static T Run<T>(Func<T> func, string description)
{
Stopwatch sw = Stopwatch.StartNew();
T result = func();
Console.WriteLine($"--> {description}: {sw.ElapsedMilliseconds}ms");
return result;
}
}
class Test
{
public long ID { set; get; }
public string Name { set; get; }
public long Age { set; get; }
}
}
