diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
index 9ee401be1..bbf4bcf92 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
@@ -216,6 +216,13 @@ namespace SqlSugar
             resolveExpress.MappingColumns = Context.MappingColumns;
             resolveExpress.MappingTables = Context.MappingTables;
             resolveExpress.IgnoreComumnList = Context.IgnoreColumns;
+            resolveExpress.InitMappingInfo = this.Context.InitMppingInfo;
+            resolveExpress.RefreshMapping = () =>
+            {
+                resolveExpress.MappingColumns = Context.MappingColumns;
+                resolveExpress.MappingTables = Context.MappingTables;
+                resolveExpress.IgnoreComumnList = Context.IgnoreColumns;
+            };
             resolveExpress.Resolve(expression, resolveType);
             this.Parameters.AddRange(resolveExpress.Parameters);
             var reval = resolveExpress.Result;
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
index 2fdaeff12..cd0ef0fdb 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
@@ -28,9 +28,9 @@ namespace SqlSugar
         public int ExecuteCommand()
         {
             PreToSql();
+            Check.Exception(UpdateBuilder.WhereValues.IsNullOrEmpty() && GetPrimaryKeys().IsNullOrEmpty(), "You cannot have no primary key and no conditions");
             string sql = UpdateBuilder.ToSqlString();
             RestoreMapping();
-            Check.Exception(UpdateBuilder.WhereValues.IsNullOrEmpty() && GetPrimaryKeys().IsNullOrEmpty(), "You cannot have no primary key and no conditions");
             return this.Ado.ExecuteCommand(sql, UpdateBuilder.Parameters == null ? null : UpdateBuilder.Parameters.ToArray());
         }
         public Task<int> ExecuteCommandAsync()
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/ExpressionContext.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/ExpressionContext.cs
index ffcfabbd6..ee0eaa8ac 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/ExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/ExpressionContext.cs
@@ -99,6 +99,8 @@ namespace SqlSugar
         }
         public virtual string SqlTranslationLeft { get { return "["; } }
         public virtual string SqlTranslationRight { get { return "]"; } }
+        public virtual Action<Type> InitMappingInfo { get; set; }
+        public virtual Action RefreshMapping { get; set; }
         #endregion
 
         #region Core methods 
@@ -143,7 +145,7 @@ namespace SqlSugar
             else if (isMapping)
             {
                 var mappingInfo = this.MappingTables.FirstOrDefault(it => it.EntityName.Equals(entityName, StringComparison.CurrentCultureIgnoreCase));
-                return SqlTranslationLeft + (mappingInfo == null ? entityName : mappingInfo.EntityName) + SqlTranslationRight;
+                return SqlTranslationLeft + (mappingInfo == null ? entityName : mappingInfo.DbTableName) + SqlTranslationRight;
             }
             else if (isComplex)
             {
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Subquery/Items/SubFromTable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Subquery/Items/SubFromTable.cs
index 7d2832817..f9f157965 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Subquery/Items/SubFromTable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Subquery/Items/SubFromTable.cs
@@ -38,7 +38,13 @@ namespace SqlSugar
         {
             var exp = expression as MethodCallExpression;
             var resType = exp.Method.ReturnType;
-            var name = resType.GetGenericArguments().First().Name;
+            var entityType = resType.GetGenericArguments().First();
+            var name = entityType.Name;
+            if (this.Context.InitMappingInfo != null)
+            {
+                this.Context.InitMappingInfo(entityType);
+                this.Context.RefreshMapping();
+            }
             return "FROM "+this.Context.GetTranslationTableName(name, true);
         }
     }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/ILambdaExpressions.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/ILambdaExpressions.cs
index 6d390cd5b..1707894e7 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/ILambdaExpressions.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/ILambdaExpressions.cs
@@ -22,6 +22,8 @@ namespace SqlSugar
         ExpressionResult Result { get; set; }
         string SqlParameterKeyWord { get; }
         string SingleTableNameSubqueryShortName { get; set; }
+         Action<Type> InitMappingInfo { get; set; }
+         Action RefreshMapping { get; set; }
 
         string GetAsString(string fieldName, string fieldValue);
         void Resolve(Expression expression, ResolveExpressType resolveType);
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
index ce42d1529..af0f0ecb6 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>4.5.2.6</Version>
+    <Version>4.5.2.8</Version>
     <Copyright>sun_kai_xuan</Copyright>
     <PackageProjectUrl>https://github.com/sunkaixuan/SqlSugar</PackageProjectUrl>
     <PackageLicenseUrl></PackageLicenseUrl>