동적 쿼리

BooleanBuilder builder = new BooleanBuilder(); if (usernameCond != null) { builder.and(member.username.eq(usernameCond); } queryFactory .selectFrom(member) .where(builder) .fetch();

queryFactory .selectFrom(member) .where(usernameEq(usernameCond)) .fetch(); private BooleanExpression usernameEq(String usernameCond) { if (usernameCond == null) { return null; } return member.username.eq(usernameCond); }