性能

FreeSql现实了强大功能的同时，性能没有受到影响，项目中使用反射或耗时的操作都经过了缓存处理。读取数据部分采用了ExpressionTree，使得FreeSql解析实体数据的速度与Dapper非常接近。

测试代码

IFreeSql mysql = new FreeSql.FreeSqlBuilder()
    .UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=100")
    .UseLogger(new LoggerFactory().CreateLogger("FreeSql.MySql"))
    //由于null会默认输出日志到控制台，影响测试结果。这里传入一个空的日志输出对象
    .UseAutoSyncStructure(false)
    //关闭自动迁移功能
    .Build();

class Song {
    public int Id { get; set; }
    public string Title { get; set; }
    public string Url { get; set; }
    public DateTime Create_time { get; set; }
    public bool Is_deleted { get; set; }
}

测试方法忽略第一次执行结果，以第二次执行结果为准。

测试结果

	数量	Query<Class>	Query<Tuple>	Query<dynamic>	ToList
Dapper	131072	623.4959ms	424.2411ms	644.8897ms	-
FreeSql	131072	647.0552ms	577.3532ms	944.7454ms	622.8980ms
				(不推荐)	(推荐)

FreeSql以微小的性能差距输了，原因是支持了更多的类型，某些类型解析需要Parse、递归或循环处理。

由于Dapper没有批量插入/更新/删除的功能，并且都是执行一条SQL命令，测试结果没有意义。

FreeSql批量插入使用的命令：INSERT INTO Song (...) VALUES(...),VALUES(...),VALUES(...)...

执行SQL返回实体列表 Dapper.Query<Class> VS FreeSql.Query<Class>

[Fact]
public void QueryEntity() {
    var sb = new StringBuilder();
    var time = new Stopwatch();

    time.Restart();
    List<Song> dplist1 = null;
    using (var conn = g.mysql.Ado.MasterPool.Get()) {
        dplist1 = Dapper.SqlMapper.Query<Song>(conn.Value, "select * from song").ToList();
    }
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Entity Counts: {dplist1.Count}; ORM: Dapper");

    time.Restart();
    var t3 = g.mysql.Ado.Query<Song>("select * from song");
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Entity Counts: {t3.Count}; ORM: FreeSql*");
}

执行SQL返回元组列表 Dapper.Query<Tuple> VS FreeSql.Query<Tuple>

[Fact]
public void QueryTuple() {
    var sb = new StringBuilder();
    var time = new Stopwatch();

    time.Restart();
    List<(int, string, string)> dplist2 = null;
    using (var conn = g.mysql.Ado.MasterPool.Get()) {
        dplist2 = Dapper.SqlMapper.Query<(int, string, string)>(conn.Value, "select * from song").ToList();
    }
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Tuple Counts: {dplist2.Count}; ORM: Dapper");

    time.Restart();
    var t4 = g.mysql.Ado.Query<(int, string, string)>("select * from song");
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Tuple Counts: {t4.Count}; ORM: FreeSql*");
}

执行SQL返回dynamic列表 Dapper.Query<dynamic> VS FreeSql.Query<dynamic>

[Fact]
public void QueryDynamic() {
    var sb = new StringBuilder();
    var time = new Stopwatch();

    time.Restart();
    List<dynamic> dplist3 = null;
    using (var conn = g.mysql.Ado.MasterPool.Get()) {
        dplist3 = Dapper.SqlMapper.Query<dynamic>(conn.Value, "select * from song").ToList();
    }
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Dynamic Counts: {dplist3.Count}; ORM: Dapper");
    
    time.Restart();
    var t5 = g.mysql.Ado.Query<dynamic>("select * from song");
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Dynamic Counts: {t3.Count}; ORM: FreeSql*");
}

Dapper.Query VS FreeSql.ToList

[Fact]
public void QueryList() {
    var sb = new StringBuilder();
    var time = new Stopwatch();

    time.Restart();
    var t3 = g.mysql.Select<Song>().ToList();
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; ToList Entity Counts: {t3.Count}; ORM: FreeSql*");

    time.Restart();
    List<Song> dplist1 = null;
    using (var conn = g.mysql.Ado.MasterPool.Get()) {
        dplist1 = Dapper.SqlMapper.Query<Song>(conn.Value, "select * from song").ToList();
    }
    time.Stop();
    sb.AppendLine($"Elapsed: {time.Elapsed}; Query Entity Counts: {dplist1.Count}; ORM: Dapper");
}

更多测试源码：FreeSql/FreeSql.Tests.PerformanceTests/MySqlAdoTest.cs