Update mysql bulkcopy

Src/Asp.Net/SqlSugar/Abstract/FastestProvider/Private.cs

@@ -175,6 +175,14 @@ namespace SqlSugar
                 }
             }
             ).Copy();
+            List<string> uInt64TypeName = new List<string>();
+            foreach (DataColumn item in tempDataTable.Columns)
+            {
+                if (item.DataType == typeof(UInt64))
+                {
+                    uInt64TypeName.Add(item.ColumnName);
+                }
+            }
             var temColumnsList = tempDataTable.Columns.Cast<DataColumn>().Select(it => it.ColumnName.ToLower()).ToList();
             var columns = dt.Columns.Cast<DataColumn>().Where(it => temColumnsList.Contains(it.ColumnName.ToLower())).ToList();
             foreach (DataRow item in dt.Rows)
@@ -184,13 +192,13 @@ namespace SqlSugar
                 {
 
                     dr[column.ColumnName] = item[column.ColumnName];
-                    if (dr[column.ColumnName] == null)
+                    if (dr[column.ColumnName] == null|| dr[column.ColumnName] == DBNull.Value)
                     {
                         dr[column.ColumnName] = DBNull.Value;
                     }
-                    if (column.DataType==UtilConstants.BoolType&&this.context.CurrentConnectionConfig.DbType.IsIn(DbType.MySql, DbType.MySqlConnector)) 
+                    else if(column.DataType==UtilConstants.BoolType&&this.context.CurrentConnectionConfig.DbType.IsIn(DbType.MySql, DbType.MySqlConnector)) 
                     {
-                        if (Convert.ToBoolean(dr[column.ColumnName]) == false) 
+                        if (Convert.ToBoolean(dr[column.ColumnName]) == false&&uInt64TypeName.Any(z => z.EqualCase(column.ColumnName))) 
                         {
                             dr[column.ColumnName] = DBNull.Value;
                         }