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";
static 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(); //請務必定義成 Singleton 單例模式
[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() 多次，相當於拼接
更新指定列，累加
fsql.Update<Topic>(1)
.Set(a => a.Clicks + 1)
.Set(a => a.Time == DateTime.Now)
.ExecuteAffrows();
//UPDATE `tb_topic` SET `Clicks` = ifnull(`Clicks`,0) + 1, `Time` = now()
//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)
根據 Dto 更新
fsql.Update<T>()
.SetDto(new { title = "xxx", clicks = 2 })
.Where(a => a.Id == 1)
.ExecuteAffrows();
//UPDATE `tb_topic` SET `Title` = ?p_0, `Clicks` = ?p_1
//WHERE (Id = 1)
fsql.Update<T>()
.SetDto(new Dictionary<string, object> { ["title"] = "xxx", ["clicks"] = 2 })
.Where(a => a.Id == 1)
.ExecuteAffrows();
//效果同上
自定義SQL
fsql.Update<Topic>()
.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 | 設置列的的新值為基礎上增加，Set(a => a.Clicks + 1)，相當於 clicks=clicks+1 |
| SetDto | <this> | object | 根據 dto 更新的方法 |
| 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，將其主鍵作為條件 |
| 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，返回更新后的記錄 |
系列文章導航
-
（十二）更新數據時指定列