<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><span style="color:#f92672">from</span> collections <span style="color:#f92672">import</span> deque </span></span><span

<h3 id="jdbc">JDBC</h3> <blockquote> <p>자바 프로그램을 DB와 연결해주는 API</p> </blockquote> <h3 id="jdbc-드라이버">JDBC 드라이버</h3> <blockquote> <p>DBMS와 통신을 담당하는 자바 클래스</p> </blockquote> <ul> <li>JDBC 드라이버는 4가지 종류가 있다 (Type 1~4)</li> <li>Mysql은 Type 4를 지원한다</li> <li>예제 - Connection을 직접 연결 <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:

<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><span style="color:#f92672">import</span> heapq </span></span><span style="display:flex;"><span style="white-space:pre;

<h3 id="jdbc">JDBC</h3> <blockquote> <p>자바 프로그램을 DB와 연결해주는 API</p> </blockquote> <h3 id="jdbc-드라이버">JDBC 드라이버</h3> <blockquote> <p>DBMS와 통신을 담당하는 자바 클래스</p> </blockquote> <ul> <li>JDBC 드라이버는 4가지 종류가 있다 (Type 1~4)</li> <li>Mysql은 Type 4를 지원한다</li> <li>예제 - Connection을 직접 연결 <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:

<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><span style="color:#f92672">from</span> collections <span style="color:#f92672">import</span> deque </span></span><span

<h3 id="프록시-객체">프록시 객체</h3> <ul> <li>프록시는 JPA의 실제 엔티티를 필요할 때만 꺼내쓰도록하는 가짜 객체이다</li> <li>em.find 대신 em.getReference를 사용하면 프록시 객체를 얻을 수 있다</li> <li>JPA에서는 프록시 객체를 사용하여 지연 로딩을 지원한다 <ul> <li>FetchType.EAGER (즉시 로딩) <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;use

<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-python" data-lang="python"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><span style="color:#66d9ef">def</span> <span style="color:#a6e22e">solution</span>(n, left, right): </span></span><span

<h3 id="문제상황">문제상황</h3> <ul> <li> <p>MockMvc를 이용하여 Controller를 테스트하고 있었다</p> </li> <li> <p>createUser 메소드는 인자로 UserResponse(DTO) 객체를 받는다</p> </li> <li> <p>UserResponse 내 int타입의 age변수의 값이 null로 들어오는 문제가 있었다</p> </li> <li> <p>UserController.java</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span style="white-