FreeSql (十三)更新數據時忽略列

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; }
}

保存實體,忽略一些列

fsql.Update<Topic>().SetSource(item).IgnoreColumns(a => a.Clicks).ExecuteAffrows();
//UPDATE `tb_topic` SET `Title` = ?p_0, `CreateTime` = ?p_1 WHERE (`Id` = 1)

fsql.Update<Topic>().SetSource(item).IgnoreColumns(a => new { a.Clicks, a.CreateTime }).ExecuteAffrows();
//UPDATE `tb_topic` SET `Title` = ?p_0 WHERE (`Id` = 1)

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
IgnoreColumns <this> Lambda 忽略的列
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

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