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how to check update statement really modify a record
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You can of course bypass the whole issue by phrasing your UPDATE statement more carefully.  For example, only choosing candidates for which you know a change needs to be made:

UPDATE t SET x=5 WHERE id==47 AND x IS NOT 5;

Will only attempt to change rows where a change is required and will not attempt to change rows where a change is not required.  It says nothing, of course, about whether or not there is a row after the update which has id == 37 and x == 5.