游标在fetch的时候出错，sqlcode=420，然后进行错误处理的时候去关闭游标报出501的错误。
是游标fetch的时候出错，游标会自动关闭吗？还是出现一些固定的错误的时候游标才会自动关闭（比如sqlcode=420的错误）。
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SQL0501N The cursor specified in a FETCH or CLOSE statement is not
open.
Explanation:
The program attempted to either: (1) FETCH using a cursor, or (2) CLOSE
a cursor at a time when the specified cursor was not open.
The statement cannot be processed.
User response:
Check for a previous message (SQLCODE) that may have closed the cursor.
Note that after the cursor is closed, any fetches or close cursor
statements receive SQLCODE -501.
If no previous SQLCODEs have been issued, correct the application
program to ensure that the cursor is open when the FETCH or CLOSE
statement is executed.