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| + | ====== OPEN Statement - PL/HQL Reference ====== | ||
| + | OPEN statement opens a cursor. | ||
| + | |||
| + | **Syntax**: | ||
| + | |||
| + | <code language=sql> | ||
| + | OPEN cursor_name [FOR expression | select_statement]; | ||
| + | </code> | ||
| + | |||
| + | **Description:** | ||
| + | | cursor_name | The name of the previously declared cursor if FOR clause is not specified | | ||
| + | | FOR expression | Variable or expression that contains a dynamic SQL | | ||
| + | | FOR select_statement | SELECT statement | | ||
| + | |||
| + | **Examples:** | ||
| + | |||
| + | Open the previously declared cursor: | ||
| + | |||
| + | <code language=sql> | ||
| + | DECLARE tabname VARCHAR(20) DEFAULT 'db.orders'; | ||
| + | DECLARE id INT; | ||
| + | DECLARE cur CURSOR FOR 'SELECT id FROM ' || tabname; | ||
| + | OPEN cur; | ||
| + | FETCH cur INTO id; | ||
| + | WHILE SQLCODE=0 THEN | ||
| + | PRINT id; | ||
| + | FETCH cur INTO id; | ||
| + | END WHILE; | ||
| + | CLOSE cur; | ||
| + | </code> | ||
| + | |||
| + | Open a cursor using a dynamic SQL: | ||
| + | |||
| + | <code language=sql> | ||
| + | DECLARE tabname VARCHAR(20) DEFAULT 'db.orders'; | ||
| + | DECLARE id INT; | ||
| + | OPEN cur FOR 'SELECT id FROM ' || tabname; | ||
| + | FETCH cur INTO id; | ||
| + | WHILE SQLCODE=0 THEN | ||
| + | PRINT id; | ||
| + | FETCH cur INTO id; | ||
| + | END WHILE; | ||
| + | CLOSE cur; | ||
| + | </code> | ||
| + | |||
| + | **Compatibility:** Oracle, IBM DB2, Teradata, SQL Server, PostgreSQL, MySQL and Netezza. | ||
| + | |||
| + | **See also:** | ||
| + | * [[declare-cursor|DECLARE CURSOR]] | ||
| + | * [[fetch|FETCH]] | ||
| + | * [[close|CLOSE]] | ||
| + | * [[sqlcode|SQLCODE]] | ||
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