> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/client-interfaces/ecpg/ecpg-sql-commands/ecpg-sql-open.md).

# OPEN

### OPEN

OPEN — 開啟動態游標

### 語法

```

OPEN cursor_name
OPEN cursor_name USING value [, ... ]
OPEN cursor_name USING SQL DESCRIPTOR descriptor_name
```

### 說明

`OPEN` 開啟游標，並可選擇將實際值繫結至游標宣告中的預留位置。游標必須事先以 `DECLARE` 命令宣告。執行 `OPEN` 會使查詢開始在伺服器上執行。

### 參數

*`cursor_name`* [#](#ECPG-SQL-OPEN-CURSOR-NAME) : 要開啟的游標名稱。可以是 SQL 識別字或主機變數。

*`value`* [#](#ECPG-SQL-OPEN-VALUE) : 要繫結至游標預留位置的值。可以是 SQL 常數、主機變數，或含指標的主機變數。

*`descriptor_name`* [#](#ECPG-SQL-OPEN-DESCRIPTOR-NAME) : 含有要繫結至游標預留位置之值的描述區名稱。可以是 SQL 識別字或主機變數。

### 範例

```

EXEC SQL OPEN a;
EXEC SQL OPEN d USING 1, 'test';
EXEC SQL OPEN c1 USING SQL DESCRIPTOR mydesc;
EXEC SQL OPEN :curname1;
```

### 相容性

SQL 標準規定了 `OPEN`。

### 另請參閱

[DECLARE](/client-interfaces/ecpg/ecpg-sql-commands/ecpg-sql-declare.md), [CLOSE](/reference/sql-commands/sql-close.md)

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/ecpg-sql-open.html)（英文原文，待翻譯）


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