Support pgsql dictionary null

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

@@ -41,6 +41,17 @@ namespace SqlSugar
             var mappings = this.MappingTypes.Where(it => it.Key == dbTypeName);
             return mappings.HasValue() ? mappings.First().Key : "string";
         }
+
+        public string GetCsharpTypeNameByDbTypeName(string dbTypeName)
+        {
+            var mappings = this.MappingTypes.Where(it => it.Key == dbTypeName);
+            if (mappings == null || mappings.Count() == 0)
+            {
+                return "string";
+            }
+            var result = mappings.First().Value.ObjToString();
+            return result;
+        }
         public virtual string GetConvertString(string dbTypeName)
         {
             string result = string.Empty;

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

@@ -103,6 +103,7 @@ namespace SqlSugar
             #endregion
             if (this.IsSingle)
             {
+                var isDic = this.EntityInfo.DbTableName.StartsWith("Dictionary`");
                 foreach (var item in this.InsertBuilder.DbColumnInfoList)
                 {
                     if (this.InsertBuilder.Parameters == null) this.InsertBuilder.Parameters = new List<SugarParameter>();
@@ -119,6 +120,15 @@ namespace SqlSugar
                     {
                         paramters.IsArray = true;
                     }
+                    if (item.Value == null && isDic)
+                    {
+                        var type = this.SqlBuilder.GetNullType(this.InsertBuilder.GetTableNameString, item.DbColumnName);
+                        if (type != null)
+                        {
+                            paramters = new SugarParameter(this.SqlBuilder.SqlParameterKeyWord + item.DbColumnName, item.Value, type);
+
+                        }
+                    }
                     this.InsertBuilder.Parameters.Add(paramters);
                 }
             }

Src/Asp.Net/SqlSugar/Abstract/UpdateProvider/UpdateableHelper.cs

@@ -268,6 +268,7 @@ namespace SqlSugar
             #endregion
             if (this.IsSingle)
             {
+                var isDic = this.EntityInfo.DbTableName.StartsWith("Dictionary`");
                 foreach (var item in this.UpdateBuilder.DbColumnInfoList)
                 {
                     if (this.UpdateBuilder.Parameters == null) this.UpdateBuilder.Parameters = new List<SugarParameter>();
@@ -284,6 +285,14 @@ namespace SqlSugar
                     {
                         parameter.IsArray = true;
                     }
+                    if (item.Value == null && isDic)
+                    {
+                        var type = this.SqlBuilder.GetNullType(this.UpdateBuilder.GetTableNameString, item.DbColumnName);
+                        if (type != null)
+                        {
+                            parameter = new SugarParameter(this.SqlBuilder.SqlParameterKeyWord + item.DbColumnName, item.Value, type);
+                        }
+                    }
                     this.UpdateBuilder.Parameters.Add(parameter);
                 }
             }

Src/Asp.Net/SqlSugar/Interface/IDbBind.cs

@@ -21,6 +21,7 @@ namespace SqlSugar
         string GetConvertString(string dbTypeName);
         string GetDbTypeName(string csharpTypeName);
         string GetCsharpTypeName(string dbTypeName);
+        string GetCsharpTypeNameByDbTypeName(string dbTypeName);
         List<KeyValuePair<string, CSharpDataType>> MappingTypes { get; }
         List<T> DataReaderToList<T>(Type type, IDataReader reader);
         Task<List<T>> DataReaderToListAsync<T>(Type entityType, IDataReader dataReader);

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs

@@ -108,12 +108,12 @@ namespace SqlSugar
             var columnInfo=this.Context.DbMaintenance.GetColumnInfosByTableName(tableName).FirstOrDefault(z => z.DbColumnName.EqualCase(columnName));
             if (columnInfo != null) 
             {
-                var cTypeName=this.Context.Ado.DbBind.GetCsharpTypeName(UtilConstants.StringType.Name);
-                var value=UtilMethods.ConvertDataByTypeName(cTypeName, "");
+                var cTypeName=this.Context.Ado.DbBind.GetCsharpTypeNameByDbTypeName(columnInfo.DataType);
+                var value=UtilMethods.GetTypeByTypeName(cTypeName);
                 if (value != null) 
                 {
                     var key = "GetNullType_" + tableName + columnName;
-                    return new ReflectionInoCacheService().GetOrCreate(key, () => value.GetType());
+                    return new ReflectionInoCacheService().GetOrCreate(key, () => value);
                 }
             }
             return null;

Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs

@@ -636,6 +636,103 @@ namespace SqlSugar
             }
             return dic;
         }
+
+        public static Type GetTypeByTypeName(string ctypename)
+        {
+ 
+            if (ctypename.EqualCase(UtilConstants.DecType.Name))
+            {
+                return UtilConstants.DecType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.DobType.Name))
+            {
+                return UtilConstants.DobType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.DateType.Name))
+            {
+                return UtilConstants.DateType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.IntType.Name))
+            {
+                return UtilConstants.IntType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.BoolType.Name))
+            {
+                return UtilConstants.BoolType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.LongType.Name))
+            {
+                return UtilConstants.LongType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.ShortType.Name))
+            {
+                return UtilConstants.ShortType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.DateTimeOffsetType.Name))
+            {
+                return UtilConstants.DateTimeOffsetType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.GuidType.Name))
+            {
+                return UtilConstants.GuidType;
+            }
+            else if (ctypename.EqualCase("int"))
+            {
+                return UtilConstants.IntType;
+            }
+            else if (ctypename.EqualCase("long"))
+            {
+                return UtilConstants.LongType;
+            }
+            else if (ctypename.EqualCase("short"))
+            {
+                return UtilConstants.ShortType;
+            }
+            else if (ctypename.EqualCase("byte"))
+            {
+                return UtilConstants.ByteType;
+            }
+            else if (ctypename.EqualCase("uint"))
+            {
+                return UtilConstants.UIntType;
+            }
+            else if (ctypename.EqualCase("ulong"))
+            {
+                return UtilConstants.ULongType;
+            }
+            else if (ctypename.EqualCase("ushort"))
+            {
+                return UtilConstants.UShortType;
+            }
+            else if (ctypename.EqualCase("uint32"))
+            {
+                return UtilConstants.UIntType;
+            }
+            else if (ctypename.EqualCase("uint64"))
+            {
+                return UtilConstants.ULongType;
+            }
+            else if (ctypename.EqualCase("bool"))
+            {
+                return UtilConstants.BoolType;
+            }
+            else if (ctypename.EqualCase("ToBoolean"))
+            {
+                return UtilConstants.BoolType;
+            }
+            else if (ctypename.EqualCase("uint16"))
+            {
+                return UtilConstants.UShortType;
+            }
+            else if (ctypename.EqualCase(UtilConstants.ByteArrayType.Name))
+            {
+                return UtilConstants.ByteArrayType;
+            }
+            else
+            {
+                return UtilConstants.StringType;
+            }
+        }
         public static object ConvertDataByTypeName(string ctypename,string value)
         {
             var item = new ConditionalModel() {