For 'execute': return boolean value true if the first result is a ResultSet object; false if it is an update count or there are no results .For 'executeUpdate': return int value either the row count for INSERT, UPDATE or DELETE statements, or 0 for SQL statements that return nothing
可以看JDK DOC，里面说的很详细
true if the first result is a ResultSet object; false if it is an update count or there are no results .For 'executeUpdate': return int value
either the row count for INSERT, UPDATE or DELETE statements, or 0 for SQL statements that return nothing