| 1. | Gets the number of items in the underlying data source
获取基础数据源中的项数。 |
| 2. | Moves to the next item in the underlying data source
移动到基础数据源的下一项。 |
| 3. | Moves to the first item in the underlying data source
移动到基础数据源的第一项。 |
| 4. | Refreshes the schema from the underlying data source
刷新基础数据源的架构。 （从 |
| 5. | Deletes the current row from the underlying data source
从基础数据源删除当前行。 |
| 6. | The underlying data types must always be the same
基础数据类型必须始终一致。 |
| 7. | Gets a list of data from the underlying data storage
从基础数据存储获取数据列表。 |
| 8. | Moves to the last item in the underlying data source
移动到基础数据源的最后一项。 |
| 9. | Inserts a new row into the underlying data source
将新行插入到基础数据源。 |
| 10. | Moves to the previous item in the underlying data source
移动到基础数据源的上一项。 |
