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dbClearResult() returns TRUE, invisibly, for result sets obtained from dbSendQuery(), dbSendStatement(), or dbSendQueryArrow(),

Failure modes

An attempt to close an already closed result set issues a warning for dbSendQuery(), dbSendStatement(), and dbSendQueryArrow(),


dbClearResult() frees all resources associated with retrieving the result of a query or update operation. The DBI backend can expect a call to dbClearResult() for each dbSendQuery() or dbSendStatement() call.