No one ever done it in the Majors, BUT you might be talking about the most consecutive hits. In that case, the record is 12 and is held by Pinky Higgins, of the Red Sox, in 1938 and Walt Dropo, of the Tigers, in 1952
The most hits in an MLB game is 9 by Johnny Burnett of the Cleveland Indians in an 18 inning game in 1932. For a 9 inning game the record is 7 held by Wilbert Robinson of the 1892 Baltimore Orioles...