当语句、结果集和游标不再被使用时，pureQuery会自动关闭它们。
pureQuery helps you by automatically closing statements, result sets, and cursors when they are not in use anymore.
当语句、结果集和游标不再被使用时，pureQuery会自动关闭它们。
pureQuery helps you by automatically closing statements, result sets, and cursors when they are not in use anymore.
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