Update exp to sql

Src/Asp.Net/SqlSugar/ExpressionsToSql/ExpressionContext.cs

@@ -246,6 +246,12 @@ namespace SqlSugar
             return string.Format(" {0} {1} {2} ", GetTranslationColumnName(fieldValue), "AS", GetTranslationColumnName(asName));
         }
 
+        public virtual string GetAsString2(string asName, string fieldValue)
+        {
+            if (fieldValue.Contains(".*") || fieldValue == "*") return fieldValue;
+            return string.Format(" {0} {1} {2} ",fieldValue, "AS", GetTranslationColumnName(asName));
+        }
+
         public virtual string GetEqString(string eqName, string fieldValue)
         {
             return string.Format(" {0} {1} {2} ", GetTranslationColumnName(eqName), "=", GetTranslationColumnName(fieldValue));

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve_Item.cs

@@ -15,8 +15,15 @@ namespace SqlSugar
         {
             this.Expression = item;
             this.Start();
+            if (ExpressionTool.GetMethodName(item) == "MappingColumn")
+            {
+                parameter.Context.Result.Append(this.Context.GetAsString2(asName, parameter.CommonTempData.ObjToString()));
+            }
+            else
+            {
                 parameter.Context.Result.Append(this.Context.GetAsString(asName, parameter.CommonTempData.ObjToString()));
             }
+        }
 
         private void ResloveCountAny(ExpressionParameter parameter, Expression item, string asName)
         {