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                # SPI_scroll_cursor_fetch ## Name SPI_scroll_cursor_fetch?--?從一個游標中抓取一些行 ## Synopsis ``` void SPI_scroll_cursor_fetch(Portal portal, FetchDirection direction, long count) ``` ## 描述 `SPI_scroll_cursor_fetch`從一個游標中抓取一些行。 這個函數等效于SQL命令的`FETCH`。 ## 參數 `Portal` `portal` 包含游標的入口 `FetchDirection` `direction` `FETCH_FORWARD`、`FETCH_BACKWARD`、 `FETCH_ABSOLUTE`或`FETCH_RELATIVE`之一 `long` `count` `FETCH_FORWARD`或`FETCH_BACKWARD` 抓取的最大行數;`FETCH_ABSOLUTE`抓取的絕對行數; 或`FETCH_RELATIVE`抓取的相對行數。 ## 返回值 如果成功,`SPI_processed`和`SPI_tuptable` 的設置和`SPI_execute`里一樣。 ## 注意 參閱SQL[FETCH](#calibre_link-74)命令獲取`direction` 和`count`參數的解釋的詳細信息。 如果游標的規劃沒有帶有`CURSOR_OPT_SCROLL`選項創建, 那么方向值而不是`FETCH_FORWARD`會失敗。
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