FreeSql （十二）更新數據時指定列

時間 2019-11-05

標籤 freesql 十二更新數據指定简体版

原文原文鏈接

var connstr = "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;" + 
    "Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10";

IFreeSql fsql = new FreeSql.FreeSqlBuilder()
    .UseConnectionString(FreeSql.DataType.MySql, connstr)
    .UseAutoSyncStructure(true) //自動同步實體結構到數據庫
    .Build();

[Table(Name = "tb_topic")]
class Topic {
    [Column(IsIdentity = true, IsPrimary = true)]
    public int Id { get; set; }
    public int Clicks { get; set; }
    public string Title { get; set; }
    public DateTime CreateTime { get; set; }
}

更新指定列

fsql.Update<Topic>(1).Set(a => a.CreateTime, DateTime.Now).ExecuteAffrows();
//UPDATE `tb_topic` SET `CreateTime` = '2018-12-08 00:04:59' WHERE (`Id` = 1)

支持 Set() 屢次，至關於拼接html

更新指定列，累加

fsql.Update<Topic>(1).Set(a => a.Clicks + 1).ExecuteAffrows();
//UPDATE `tb_topic` SET `Clicks` = ifnull(`Clicks`,0) + 1 WHERE (`Id` = 1)

更新指定列，一次指定

fsql.Update<Topic>(1).Set(a => new Topic {
    Clicks = a.Clicks + 1,
    Time = DateTime.Now
}).ExecuteAffrows();
//UPDATE `tb_topic` SET `Clicks` = `Clicks` + 1, Time = now() WHERE (`Id` = 1)

自定義SQL

update.SetRaw("Title = @title", new { title = "新標題" }).Where("Id = @id", 1).ExecuteAffrows();
//UPDATE `tb_topic` SET Title = @title WHERE (Id = @id)

API

方法	返回值	參數	描述
SetSource	<this>	T1 \| IEnumerable	更新數據，設置更新的實體
Set	<this>	Lambda, value	設置列的新值，Set(a => a.Name, "newvalue")
Set	<this>	Lambda	設置列的的新值爲基礎上增長，Set(a => a.Clicks + 1)，至關於 clicks=clicks+1;
SetRaw	<this>	string, parms	設置值，自定義SQL語法，SetRaw("title = ?title", new { title = "newtitle" })
Where	<this>	Lambda	表達式條件，僅支持實體基礎成員（不包含導航對象）
Where	<this>	string, parms	原生sql語法條件，Where("id = ?id", new { id = 1 })
Where	<this>	T1 \| IEnumerable	傳入實體或集合，將其主鍵做爲條件
WhereExists	<this>	ISelect	子查詢是否存在
WithTransaction	<this>	DbTransaction	設置事務對象
ToSql	string		返回即將執行的SQL語句
ExecuteAffrows	long		執行SQL語句，返回影響的行數
ExecuteUpdated	List<T1>		執行SQL語句，返回更新後的記錄