Gyumin kim/step2 user with mvc framework #5
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* `UserDao`: `update`, `findAll` 구현 * controller에서 `DataBase` 대신 `UserDao` 사용
* `JdbcTemplate` 생성, `UserDao`에서 익명 클래스로 구현
* `JdbcTemplate`: `User`에 대한 의존관계 제거
* `JdbcTemplate`과 `SelectJdbcTemplate` 통합
* callback interface 추가 (`PreparedStatementSetter`, `RowMapper`)
* Generic 사용 * 가변인자를 받아 쿼리에 인자 전달 * lambda 활용
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