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) //自动同步实体结构到数据库 .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() 多次,相当于拼接

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)
自定义SQL
update.SetRaw("Title = @title", new { title = "新标题" }).Where("Id = @id",
1).ExecuteAffrows(); //UPDATE `tb_topic` SET Title = @title WHERE (Id = @id)
API

方法 返回值 参数 描述
SetSource <this> T1 | IEnumerable 更新数据,设置更新的实体
Set <this> Lambda, value 设置列的新值,Set(a => a.Name, "newvalue")
Set <this> Lambda 设置列的的新值为基础上增加,Set(a => a.Clicks + 1),相当于 clicks=clicks+1;
SetRaw <this> string, parms 设置值,自定义SQL语法,SetRaw("title = ?title", new { title
= "newtitle" })
Where <this> Lambda 表达式条件,仅支持实体基础成员(不包含导航对象)
Where <this> string, parms 原生sql语法条件,Where("id = ?id", new { id = 1 })
Where <this> T1 | IEnumerable 传入实体或集合,将其主键作为条件
WhereExists <this> ISelect 子查询是否存在
WithTransaction <this> DbTransaction 设置事务对象
ToSql string 返回即将执行的SQL语句
ExecuteAffrows long 执行SQL语句,返回影响的行数
ExecuteUpdated List<T1> 执行SQL语句,返回更新后的记录
系列文章导航

*
(一)入门 <https://www.cnblogs.com/FreeSql/p/11531300.html>

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(二)自动迁移实体 <https://www.cnblogs.com/FreeSql/p/11531301.html>

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(三)实体特性 <https://www.cnblogs.com/FreeSql/p/11531302.html>

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(四)实体特性 Fluent Api <https://www.cnblogs.com/FreeSql/p/11531304.html>

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(五)插入数据 <https://www.cnblogs.com/FreeSql/p/11531306.html>

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(六)批量插入数据 <https://www.cnblogs.com/FreeSql/p/11531309.html>

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(七)插入数据时忽略列 <https://www.cnblogs.com/FreeSql/p/11531316.html>

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(八)插入数据时指定列 <https://www.cnblogs.com/FreeSql/p/11531318.html>

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(九)删除数据 <https://www.cnblogs.com/FreeSql/p/11531320.html>

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(十)更新数据 <https://www.cnblogs.com/FreeSql/p/11531321.html>

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(十一)更新数据 Where <https://www.cnblogs.com/FreeSql/p/11531324.html>

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(十二)更新数据时指定列

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(十三)更新数据时忽略列 <https://www.cnblogs.com/FreeSql/p/11531334.html>

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(十四)批量更新数据 <https://www.cnblogs.com/FreeSql/p/11531335.html>

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(十五)查询数据 <https://www.cnblogs.com/FreeSql/p/11531339.html>

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(十六)分页查询 <https://www.cnblogs.com/FreeSql/p/11531341.html>

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(十七)联表查询 <https://www.cnblogs.com/FreeSql/p/11531346.html>

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(十八)导航属性 <https://www.cnblogs.com/FreeSql/p/11531352.html>

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(十九)多表查询 <https://www.cnblogs.com/FreeSql/p/11531362.html>

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(二十)多表查询 WhereCascade <https://www.cnblogs.com/FreeSql/p/11531372.html>

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(二十一)查询返回数据 <https://www.cnblogs.com/FreeSql/p/11531376.html>

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(二十二)Dto 映射查询 <https://www.cnblogs.com/FreeSql/p/11531381.html>

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(二十三)分组、聚合 <https://www.cnblogs.com/FreeSql/p/11531384.html>

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(二十四)Linq To Sql 语法使用介绍 <https://www.cnblogs.com/FreeSql/p/11531392.html>

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(二十五)延时加载 <https://www.cnblogs.com/FreeSql/p/11531395.html>

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(二十六)贪婪加载 Include、IncludeMany、Dto、ToList
<https://www.cnblogs.com/FreeSql/p/11531404.html>

*
(二十七)将已写好的 SQL 语句,与实体类映射进行二次查询
<https://www.cnblogs.com/FreeSql/p/11531416.html>

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(二十八)事务 <https://www.cnblogs.com/FreeSql/p/11531423.html>

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(二十九)Lambda 表达式 <https://www.cnblogs.com/FreeSql/p/11531425.html>

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(三十)读写分离 <https://www.cnblogs.com/FreeSql/p/11531430.html>

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(三十一)分区分表 <https://www.cnblogs.com/FreeSql/p/11531435.html>

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(三十二)Aop <https://www.cnblogs.com/FreeSql/p/11531471.html>

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(三十三)CodeFirst 类型映射 <https://www.cnblogs.com/FreeSql/p/11531543.html>

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(三十四)CodeFirst 迁移说明 <https://www.cnblogs.com/FreeSql/p/11531550.html>

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(三十五)CodeFirst 自定义特性 <https://www.cnblogs.com/FreeSql/p/11531576.html>