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[ibatis] delete, update, insert return value 리턴 값 (iBatis return values)


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# insert : 성공 시 null 반환, 실패하면 에러 발생
# update : 성공 시 1, 실패 시 0 반환
# delete : 삭제한 row수를 반환
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# insert :
  -> success : null
  -> fail : error

# update :
  -> success : 1
  -> fail : 0

# delete :
  -> success : delete row count
  -> fail : error

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