C# SQLite执行效率的优化教程

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; }
 }
}

public int ExecuteNonQuery(string sql, params SQLiteParameter[] parameters) 
 { 
  int affectedRows = 0; 
  using (SQLiteConnection connection = new SQLiteConnection(connectionString)) 
  { 
  using (SQLiteCommand command = new SQLiteCommand(connection)) 
  { 
   try 
   { 
   connection.Open(); 
   command.CommandText = sql; 
   if (parameters.Length != 0) 
   { 
    command.Parameters.AddRange(parameters); 
   } 
   affectedRows = command.ExecuteNonQuery(); 
   } 
   catch (Exception) { throw; } 
  } 
  } 
  return affectedRows; 
 }