FreeSql提供丰富的数据库更新功能,支持单条或批量更新,在特定的数据库执行还可以返回更新后的记录。
static IFreeSql fsql = new FreeSql.FreeSqlBuilder()
.UseConnectionString(FreeSql.DataType.MySql, connectionString)
.UseAutoSyncStructure(true) //自动同步实体结构到数据库
.Build(); //请务必定义成 Singleton 单例模式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; }
}
更新实体
方法1:(推荐)
只更新变化的属性,依赖 FreeSql.Repository
var repo = fsql.GetRepository<Topic>();var item = repo.Where(a => a.Id == 1).First(); //此时快照 item
item.Title = "newtitle";
repo.Update(item); //对比快照时的变化//UPDATE `Topic` SET `Title` = @p_0//WHERE (`Id` = 1)
是不是觉得先查询再更新,啰嗦?
var repo = fsql.GetRepository<Topic>();var item = new Topic { Id = 1 };
repo.Attach(item); //此时快照 item
item.Title = "newtitle";
repo.Update(item); //对比快照时的变化//UPDATE `Topic` SET `Title` = @p_0//WHERE (`Id` = 1)
方法2:(原始)
//v1.5.0 忽略更新 null 值的属性
fsql.Update<Topic>()
.SetSourceIgnore(item, col => col == null)
.ExecuteAffrows();
var item = new Topic { Id = 1, Title = "newtitle" };
fsql.Update<Topic>()
.SetSource(item)
.ExecuteAffrows();//UPDATE `Topic` SET `Clicks` = @p_0, `Title` = @p_1, `CreateTime` = @p_2
//WHERE (`Id` = 1)
fsql.Update<Topic>()
.SetSource(item)
.UpdateColumns(a => new { a.Title, a.CreateTime })
.ExecuteAffrows();//UPDATE `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 `Topic` SET `Title` = @p_0
//WHERE (`Id` = 1)var items = new List<Topic>();for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 });
fsql.Update<Topic>()
.SetSource(items)
.ExecuteAffrows();//UPDATE `Topic` SET `Clicks` = CASE `Id` WHEN 1 THEN @p_0 WHEN 2 THEN @p_1 WHEN 3 THEN @p_2 WHEN 4 THEN @p_3 WHEN 5 THEN @p_4 WHEN 6 THEN @p_5 WHEN 7 THEN @p_6 WHEN 8 THEN @p_7 WHEN 9 THEN @p_8 WHEN 10 THEN @p_9 END,
//`Title` = CASE `Id` WHEN 1 THEN @p_10 WHEN 2 THEN @p_11 WHEN 3 THEN @p_12 WHEN 4 THEN @p_13 WHEN 5 THEN @p_14 WHEN 6 THEN @p_15 WHEN 7 THEN @p_16 WHEN 8 THEN @p_17 WHEN 9 THEN @p_18 WHEN 10 THEN @p_19 END,
//`CreateTime` = CASE `Id` WHEN 1 THEN @p_20 WHEN 2 THEN @p_21 WHEN 3 THEN @p_22 WHEN 4 THEN @p_23 WHEN 5 THEN @p_24 WHEN 6 THEN @p_25 WHEN 7 THEN @p_26 WHEN 8 THEN @p_27 WHEN 9 THEN @p_28 WHEN 10 THEN @p_29 END
//WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10))
fsql.Update<Topic>()
.SetSource(items)
.IgnoreColumns(a => new { a.Clicks, a.CreateTime })
.ExecuteAffrows();//UPDATE `Topic` SET `Title` = CASE `Id` WHEN 1 THEN @p_0 WHEN 2 THEN @p_1 WHEN 3 THEN @p_2 WHEN 4 THEN @p_3 WHEN 5 THEN @p_4 WHEN 6 THEN @p_5 WHEN 7 THEN @p_6 WHEN 8 THEN @p_7 WHEN 9 THEN @p_8 WHEN 10 THEN @p_9 END
//WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10))
fsql.Update<Topic>()
.SetSource(items)
.Set(a => a.CreateTime, DateTime.Now)
.ExecuteAffrows();//UPDATE `Topic` SET `CreateTime` = @p_0
//WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10))
指定 Set 列更新后,SetSource 将失效
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 |
CommandTimeout | <this> | int | 命令超时设置(秒) |
WithTransaction | <this> | DbTransaction | 设置事务对象 |
WithConnection | <this> | DbConnection | 设置连接对象 |
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 |