Groovy - Related information

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• Groovy sql, if the query result is empty set, but I want to use a value to represent it, what to do with it?

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36cee-2b3a8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36cee-2b3a8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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