#30 jpa basic: jpql

hello-jpa/src/main/java/com/hello/jpa/query/JpaMain.java

@@ -0,0 +1,57 @@
+package com.hello.jpa.query;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Root;
+import java.util.List;
+
+public class JpaMain {
+
+    public static void main(String[] args) {
+        EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
+
+        EntityManager em = emf.createEntityManager();
+
+        EntityTransaction tx = em.getTransaction();
+        tx.begin();
+
+        try {
+            Member member = new Member();
+            member.setName("member");
+            em.persist(member);
+            Member member2 = new Member();
+            member2.setName("kim2");
+            em.persist(member2);
+
+            List<Member> result = em.createQuery(
+                    "select m from Member m where m.name like '%kim%'",
+                    Member.class
+            ).getResultList();
+
+            result.forEach(System.out::println);
+
+            CriteriaBuilder cb = em.getCriteriaBuilder();
+            CriteriaQuery<Member> query = cb.createQuery(Member.class);
+            Root<Member> m = query.from(Member.class);
+            CriteriaQuery<Member> cq = query.select(m).where(cb.equal(m.get("name"), "kim"));
+
+            List<Member> result2 = em.createQuery(cq).getResultList();
+            result2.forEach(System.out::println);
+
+            List<Member> result3 = em.createNativeQuery("select * from member", Member.class).getResultList();
+            result3.forEach(System.out::println);
+
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+        } finally {
+            em.close();
+        }
+
+        emf.close();
+    }
+}

hello-jpa/src/main/java/com/hello/jpa/query/Member.java

@@ -0,0 +1,39 @@
+package com.hello.jpa.query;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Member {
+
+    @Id @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "Member{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}

hello-jpa/src/main/resources/META-INF/persistence.xml

@@ -36,7 +36,8 @@
 <!--        <class>com.hello.jpa.proxy.ex01.Child</class>-->
 <!--        <class>com.hello.jpa.valuetype.ex00.Member</class>-->
 <!--        <class>com.hello.jpa.valuetype.ex01.Member</class>-->
-        <class>com.hello.jpa.valuetype.ex02.Member</class>
+<!--        <class>com.hello.jpa.valuetype.ex02.Member</class>-->
+        <class>com.hello.jpa.query.Member</class>
 
         <properties>
             <!-- 필수 속성 -->