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; }
}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)| 方法 | 返回值 | 参数 | 描述 |
|---|---|---|---|
| SetSource | <this> | T1 | IEnumerable |
更新数据，设置更新的实体 |
| IgnoreColumns | <this> | Lambda | 忽略的列 |
| 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 |
原文：https://www.cnblogs.com/FreeSql/p/11531334.html