From a0acece7e504247e9970721ce48a355a00874cc8 Mon Sep 17 00:00:00 2001
From: 28810 <28810@YEXIANGQIN>
Date: Wed, 13 May 2020 16:52:12 +0800
Subject: [PATCH] =?UTF-8?q?-=20=E5=A2=9E=E5=8A=A0=20IUpdate.SetIf=20?=
 =?UTF-8?q?=E6=96=B9=E6=B3=95=EF=BC=9B#309?=
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Content-Transfer-Encoding: 8bit

---
 FreeSql/Interface/Curd/IUpdate.cs             | 19 +++++++++++++++++++
 .../Internal/CommonProvider/UpdateProvider.cs |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/FreeSql/Interface/Curd/IUpdate.cs b/FreeSql/Interface/Curd/IUpdate.cs
index 41a8758b..289f3096 100644
--- a/FreeSql/Interface/Curd/IUpdate.cs
+++ b/FreeSql/Interface/Curd/IUpdate.cs
@@ -93,6 +93,15 @@ namespace FreeSql
         /// <returns></returns>
         IUpdate<T1> Set<TMember>(Expression<Func<T1, TMember>> column, TMember value);
         /// <summary>
+        /// 设置列的新值，Set(a => a.Name, "newvalue")
+        /// </summary>
+        /// <typeparam name="TMember"></typeparam>
+        /// <param name="condition">true 时生效</param>
+        /// <param name="column">lambda选择列</param>
+        /// <param name="value">新值</param>
+        /// <returns></returns>
+        IUpdate<T1> SetIf<TMember>(bool condition, Expression<Func<T1, TMember>> column, TMember value);
+        /// <summary>
         /// 设置列的的新值为基础上增加，格式：Set(a => a.Clicks + 1) 相当于 clicks=clicks+1
         /// <para></para>
         /// 指定更新，格式：Set(a => new T { Clicks = a.Clicks + 1, Time = DateTime.Now }) 相当于 set clicks=clicks+1,time='2019-06-19....'
@@ -102,6 +111,16 @@ namespace FreeSql
         /// <returns></returns>
         IUpdate<T1> Set<TMember>(Expression<Func<T1, TMember>> exp);
         /// <summary>
+        /// 设置列的的新值为基础上增加，格式：Set(a => a.Clicks + 1) 相当于 clicks=clicks+1
+        /// <para></para>
+        /// 指定更新，格式：Set(a => new T { Clicks = a.Clicks + 1, Time = DateTime.Now }) 相当于 set clicks=clicks+1,time='2019-06-19....'
+        /// </summary>
+        /// <typeparam name="TMember"></typeparam>
+        /// <param name="condition">true 时生效</param>
+        /// <param name="exp"></param>
+        /// <returns></returns>
+        IUpdate<T1> SetIf<TMember>(bool condition, Expression<Func<T1, TMember>> exp);
+        /// <summary>
         /// 设置值，自定义SQL语法，SetRaw("title = ?title", new { title = "newtitle" })
         /// </summary>
         /// <param name="sql">sql语法</param>
diff --git a/FreeSql/Internal/CommonProvider/UpdateProvider.cs b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
index 4f85e510..1a7cf8ab 100644
--- a/FreeSql/Internal/CommonProvider/UpdateProvider.cs
+++ b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
@@ -400,6 +400,7 @@ namespace FreeSql.Internal.CommonProvider
             SetPriv(cols.First().Column, value);
             return this;
         }
+        public IUpdate<T1> SetIf<TMember>(bool condition, Expression<Func<T1, TMember>> column, TMember value) => condition ? Set(column, value) : this;
         public IUpdate<T1> Set<TMember>(Expression<Func<T1, TMember>> exp)
         {
             var body = exp?.Body;
@@ -459,6 +460,7 @@ namespace FreeSql.Internal.CommonProvider
             _setIncr.Append(", ").Append(_commonUtils.QuoteSqlName(cols.First().Column.Attribute.Name)).Append(" = ").Append(expt);
             return this;
         }
+        public IUpdate<T1> SetIf<TMember>(bool condition, Expression<Func<T1, TMember>> exp) => condition ? Set(exp) : this;
         public IUpdate<T1> SetRaw(string sql, object parms = null)
         {
             if (string.IsNullOrEmpty(sql)) return this;