From c04b7ab1de3ec8180c5b9aa96ea41a200578bf41 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Fri, 22 Sep 2023 17:20:18 +0800
Subject: [PATCH] Synchronization code

---
 .../Abstract/FastestProvider/Private.cs       |  4 +++-
 .../Abstract/FastestProvider/Setting.cs       |  6 ++++++
 .../SqlSugar/Entities/DbFastestProperties.cs  |  1 +
 Src/Asp.Net/SqlSugar/Interface/IFastest.cs    |  1 +
 .../SqlBuilder/SqlServerFastBuilder.cs        | 19 +++++++++++++++++--
 5 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Private.cs b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Private.cs
index 385895e86..528782a33 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Private.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Private.cs
@@ -19,7 +19,9 @@ namespace SqlSugar
                     result.CharacterSet = this.CharacterSet;
                     return result;
                 case DbType.SqlServer:
-                    return new SqlServerFastBuilder();
+                    var result2= new SqlServerFastBuilder();
+                    result2.DbFastestProperties.IsOffIdentity = this.IsOffIdentity;
+                    return result2;
                 case DbType.Sqlite:
                     return new SqliteFastBuilder(this.entityInfo);
                 case DbType.Oracle:
diff --git a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Setting.cs b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Setting.cs
index 11f515a75..8321461f5 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Setting.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Setting.cs
@@ -14,6 +14,7 @@ namespace SqlSugar
         private string CacheKeyLike { get; set; }
         private string CharacterSet { get; set; }
         private bool IsDataAop { get; set; }
+        private bool IsOffIdentity { get; set; }
         public IFastest<T> SetCharacterSet(string CharacterSet) 
         {
             this.CharacterSet = CharacterSet;
@@ -44,6 +45,11 @@ namespace SqlSugar
             this.Size = size;
             return this;
         }
+        public IFastest<T> OffIdentity() 
+        {
+            this.IsOffIdentity = true;
+            return this;
+        }
         public SplitFastest<T> SplitTable() 
         {
             SplitFastest<T> result = new SplitFastest<T>();
diff --git a/Src/Asp.Net/SqlSugar/Entities/DbFastestProperties.cs b/Src/Asp.Net/SqlSugar/Entities/DbFastestProperties.cs
index 6459532c1..a84fd1c79 100644
--- a/Src/Asp.Net/SqlSugar/Entities/DbFastestProperties.cs
+++ b/Src/Asp.Net/SqlSugar/Entities/DbFastestProperties.cs
@@ -10,5 +10,6 @@ namespace SqlSugar
     {
         public bool HasOffsetTime { get; set; }
         public string[] WhereColumns { get; set; }
+        public bool IsOffIdentity { get;  set; }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Interface/IFastest.cs b/Src/Asp.Net/SqlSugar/Interface/IFastest.cs
index 91b99412a..1347fe4e4 100644
--- a/Src/Asp.Net/SqlSugar/Interface/IFastest.cs
+++ b/Src/Asp.Net/SqlSugar/Interface/IFastest.cs
@@ -12,6 +12,7 @@ namespace SqlSugar
         IFastest<T> RemoveDataCache(string cacheKey);
         IFastest<T> AS(string tableName);
         IFastest<T> PageSize(int Size);
+        IFastest<T> OffIdentity();
         IFastest<T> SetCharacterSet(string CharacterSet);
         IFastest<T> EnableDataAop();
         int BulkCopy(List<T> datas);
diff --git a/Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs b/Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
index a8dcae24a..58c8bacb2 100644
--- a/Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerFastBuilder.cs
@@ -37,11 +37,26 @@ namespace SqlSugar
             SqlBulkCopy copy;
             if (this.Context.Ado.Transaction == null)
             {
-                copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection);
+                if (this.DbFastestProperties?.IsOffIdentity == true)
+                { 
+                    copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection, SqlBulkCopyOptions.KeepIdentity,null);
+                }
+                else
+                {
+                    copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection);
+                }
             }
             else
             {
-                copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection, SqlBulkCopyOptions.CheckConstraints, (SqlTransaction)this.Context.Ado.Transaction);
+                if (this.DbFastestProperties?.IsOffIdentity == true)
+                {
+                    copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection, SqlBulkCopyOptions.KeepIdentity, (SqlTransaction)this.Context.Ado.Transaction);
+                }
+                else
+                {
+
+                    copy = new SqlBulkCopy((SqlConnection)this.Context.Ado.Connection, SqlBulkCopyOptions.CheckConstraints, (SqlTransaction)this.Context.Ado.Transaction);
+                }
             }
             if (this.Context.Ado.Connection.State == ConnectionState.Closed)
             {