Update pgsql subinsert datetime bug

Src/Asp.Net/PgSqlTest/Demo/Demo3_Insertable.cs

@@ -71,7 +71,7 @@ namespace OrmTest
                 Id = 0,
                 Items = new List<OrderItem>() {
                       new OrderItem(){
-                           CreateTime=DateTime.Now,
+                         
                            OrderId=0,
                             Price=1,
                              ItemId=1

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

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Data.SqlTypes;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
@@ -243,7 +244,16 @@ namespace SqlSugar
                 }
                 else
                 {
-                    insertDictionary.Add(item.DbColumnName, item.PropertyInfo.GetValue(insetObject));
+                    var value = item.PropertyInfo.GetValue(insetObject);
+                    if (value == null&&this.Context.CurrentConnectionConfig.DbType==DbType.PostgreSQL) 
+                    {
+                       var underType= UtilMethods.GetUnderType(item.PropertyInfo.PropertyType);
+                        if (underType == UtilConstants.DateType)
+                        {
+                            value = SqlDateTime.Null;
+                        }
+                    }
+                    insertDictionary.Add(item.DbColumnName, value);
                 }
             }
             return insertDictionary;

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/PostgreSQLProvider.cs

@@ -90,6 +90,11 @@ namespace SqlSugar
             foreach (var parameter in parameters)
             {
                 if (parameter.Value == null) parameter.Value = DBNull.Value;
+                if(parameter.Value is System.Data.SqlTypes.SqlDateTime&&parameter.DbType==System.Data.DbType.AnsiString)
+                {
+                    parameter.DbType = System.Data.DbType.DateTime;
+                    parameter.Value = DBNull.Value;
+                }
                 var sqlParameter = new NpgsqlParameter();
                 sqlParameter.ParameterName = parameter.ParameterName;
                 sqlParameter.Size = parameter.Size;