Support Discrimator

Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs

@@ -227,6 +227,17 @@ namespace SqlSugar
         protected virtual void Execute(Type entityType)
         {
             var entityInfo = this.Context.EntityMaintenance.GetEntityInfoNoCache(entityType);
+            if (entityInfo.Discrimator.HasValue())
+            {
+                Check.ExceptionEasy(!Regex.IsMatch(entityInfo.Discrimator, @"^(?:\w+:\w+)(?:,\w+:\w+)*$"), "The format should be type:cat for this type, and if there are multiple, it can be FieldName:cat,FieldName2:dog ", "格式错误应该是type:cat这种格式，如果是多个可以FieldName:cat,FieldName2:dog，不要有空格");
+                var array = entityInfo.Discrimator.Split(',');
+                foreach (var disItem in array)
+                {
+                    var name = disItem.Split(':').First();
+                    var value = disItem.Split(':').Last();
+                    entityInfo.Columns.Add(new EntityColumnInfo() { IsOnlyIgnoreUpdate = true, DbColumnName = name, UnderType = typeof(string), PropertyName = name, Length = 50 });
+                }
+            }
             if (this.MappingTables.ContainsKey(entityType)) 
             {
                 entityInfo.DbTableName = this.MappingTables[entityType];

Src/Asp.Net/SqlSugar/Abstract/DynamicBuilder/Helper.cs

@@ -39,13 +39,17 @@ namespace SqlSugar
                   attributeType.GetProperty(nameof(SugarTable.TableName)),
                   attributeType.GetProperty(nameof(SugarTable.TableDescription)) ,
                   attributeType.GetProperty(nameof(SugarTable.IsDisabledUpdateAll)) ,
-                  attributeType.GetProperty(nameof(SugarTable.IsDisabledDelete))
+                  attributeType.GetProperty(nameof(SugarTable.IsDisabledDelete)),
+                  attributeType.GetProperty(nameof(SugarTable.IsCreateTableFiledSort)),
+                  attributeType.GetProperty(nameof(SugarTable.Discrimator))
             }
             , new object[] {
                     sugarTable.TableName,
                     sugarTable.TableDescription ,
                     sugarTable.IsDisabledUpdateAll,
-                    sugarTable.IsDisabledDelete
+                    sugarTable.IsDisabledDelete,
+                    sugarTable.IsCreateTableFiledSort,
+                    sugarTable.Discrimator
              });
             return attributeBuilder;
         }

Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs

@@ -62,6 +62,7 @@ namespace SqlSugar
                 result.IsDisabledUpdateAll = sugarTable.IsDisabledUpdateAll;
                 result.IsDisabledDelete = sugarTable.IsDisabledDelete;
                 result.IsCreateTableFiledSort = sugarTable.IsCreateTableFiledSort;
+                result.Discrimator = sugarTable.Discrimator;
             }
             var indexs = type.GetCustomAttributes(typeof(SugarIndexAttribute));
             if (indexs != null && indexs.Any())

Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/InsertableHelper.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
 namespace SqlSugar
@@ -292,6 +293,17 @@ namespace SqlSugar
                 }
                 insertItem.Add(columnInfo);
             }
+            if (EntityInfo.Discrimator.HasValue()) 
+            {
+                Check.ExceptionEasy(!Regex.IsMatch(EntityInfo.Discrimator, @"^(?:\w+:\w+)(?:,\w+:\w+)*$"), "The format should be type:cat for this type, and if there are multiple, it can be FieldName:cat,FieldName2:dog ", "格式错误应该是type:cat这种格式，如果是多个可以FieldName:cat,FieldName2:dog，不要有空格");
+                var array = EntityInfo.Discrimator.Split(',');
+                foreach (var disItem in array)
+                {
+                    var name = disItem.Split(':').First();
+                    var value = disItem.Split(':').Last();
+                    insertItem.Add(new DbColumnInfo() { DbColumnName = name, PropertyName = name, PropertyType = typeof(string), Value = value });
+                }
+            }
         }
 
         private string GetDbColumnName(string propertyName)

Src/Asp.Net/SqlSugar/Entities/DiscriminatorObject .cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SqlSugar 
+{
+    public struct DiscriminatorObject
+    {
+        public string FieldName { get; set; }
+        public string FieldValue { get; set; }
+    }
+}

Src/Asp.Net/SqlSugar/Entities/EntityInfo.cs

@@ -19,5 +19,6 @@ namespace SqlSugar
         public bool IsDisabledUpdateAll { get; set; }
         public List<SugarIndexAttribute> Indexs { get;  set; }
         public bool IsCreateTableFiledSort { get; set; }
+        public string Discrimator { get; set; }
     }
 }

Src/Asp.Net/SqlSugar/Entities/Mapping/SugarMappingAttribute.cs

@@ -14,6 +14,7 @@ namespace SqlSugar
         public bool IsDisabledDelete { get; set; }
         public bool IsDisabledUpdateAll { get; set; }
         public bool IsCreateTableFiledSort { get; set; }
+        public string Discrimator { get; set; } 
         public SugarTable(string tableName) {
             this.TableName = tableName;
         }

Src/Asp.Net/SqlSugar/SqlSugar.csproj

@@ -151,6 +151,7 @@
     <Compile Include="Abstract\UpdateProvider\UpdateMethodInfo.cs" />
     <Compile Include="Abstract\UpdateProvider\UpdateableHelper.cs" />
     <Compile Include="Abstract\UpdateProvider\SplitTableUpdateByObjectProvider.cs" />
+    <Compile Include="Entities\DiscriminatorObject .cs" />
     <Compile Include="Entities\PropertyMetadata.cs" />
     <Compile Include="Entities\DbFastestProperties.cs" />
     <Compile Include="Entities\DefaultCustom.cs" />