JDBC 라이브러리 구현하기

app/build.gradle

@@ -17,6 +17,9 @@ dependencies {
     implementation project(':mvc')
     implementation project(':jdbc')
 
+    implementation 'org.springframework:spring-tx:5.3.23'
+    implementation 'org.springframework:spring-jdbc:5.3.23'
+
     implementation 'org.apache.tomcat.embed:tomcat-embed-core:10.1.0-M16'
     implementation 'org.apache.tomcat.embed:tomcat-embed-jasper:10.1.0-M16'
     implementation 'ch.qos.logback:logback-classic:1.2.10'

app/src/main/java/com/techcourse/dao/UserDao.java

@@ -1,6 +1,7 @@
 package com.techcourse.dao;
 
 import com.techcourse.domain.User;
+import nextstep.jdbc.JdbcTemplate;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -21,6 +22,10 @@ public UserDao(final DataSource dataSource) {
         this.dataSource = dataSource;
     }
 
+    public UserDao(final JdbcTemplate jdbcTemplate) {
+        this.dataSource = null;
+    }
+
     public void insert(final User user) {
         final var sql = "insert into users (account, password, email) values (?, ?, ?)";
 

app/src/main/java/com/techcourse/dao/UserHistoryDao.java

@@ -0,0 +1,62 @@
+package com.techcourse.dao;
+
+import com.techcourse.domain.UserHistory;
+import nextstep.jdbc.JdbcTemplate;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+public class UserHistoryDao {
+
+    private static final Logger log = LoggerFactory.getLogger(UserHistoryDao.class);
+
+    private final DataSource dataSource;
+
+    public UserHistoryDao(final DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    public UserHistoryDao(final JdbcTemplate jdbcTemplate) {
+        this.dataSource = null;
+    }
+
+    public void log(final UserHistory userHistory) {
+        final var sql = "insert into user_history (user_id, account, password, email, created_at, created_by) values (?, ?, ?, ?, ?, ?)";
+
+        Connection conn = null;
+        PreparedStatement pstmt = null;
+        try {
+            conn = dataSource.getConnection();
+            pstmt = conn.prepareStatement(sql);
+
+            log.debug("query : {}", sql);
+
+            pstmt.setLong(1, userHistory.getUserId());
+            pstmt.setString(2, userHistory.getAccount());
+            pstmt.setString(3, userHistory.getPassword());
+            pstmt.setString(4, userHistory.getEmail());
+            pstmt.setObject(5, userHistory.getCreatedAt());
+            pstmt.setString(6, userHistory.getCreateBy());
+            pstmt.executeUpdate();
+        } catch (SQLException e) {
+            log.error(e.getMessage(), e);
+            throw new RuntimeException(e);
+        } finally {
+            try {
+                if (pstmt != null) {
+                    pstmt.close();
+                }
+            } catch (SQLException ignored) {}
+
+            try {
+                if (conn != null) {
+                    conn.close();
+                }
+            } catch (SQLException ignored) {}
+        }
+    }
+}

app/src/main/java/com/techcourse/domain/UserHistory.java

@@ -0,0 +1,59 @@
+package com.techcourse.domain;
+
+import java.time.LocalDateTime;
+
+public class UserHistory {
+
+    private Long id;
+
+    private final long userId;
+    private final String account;
+    private final String password;
+    private final String email;
+
+    private final LocalDateTime createdAt;
+
+    private final String createBy;
+
+    public UserHistory(final User user, final String createBy) {
+        this(null, user.getId(), user.getAccount(), user.getPassword(), user.getEmail(), createBy);
+    }
+
+    public UserHistory(final Long id, final long userId, final String account, final String password, final String email, final String createBy) {
+        this.id = id;
+        this.userId = userId;
+        this.account = account;
+        this.password = password;
+        this.email = email;
+        this.createdAt = LocalDateTime.now();
+        this.createBy = createBy;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public long getUserId() {
+        return userId;
+    }
+
+    public String getAccount() {
+        return account;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public String getCreateBy() {
+        return createBy;
+    }
+}

app/src/main/java/com/techcourse/service/UserService.java

@@ -0,0 +1,32 @@
+package com.techcourse.service;
+
+import com.techcourse.dao.UserDao;
+import com.techcourse.dao.UserHistoryDao;
+import com.techcourse.domain.User;
+import com.techcourse.domain.UserHistory;
+
+public class UserService {
+
+    private final UserDao userDao;
+    private final UserHistoryDao userHistoryDao;
+
+    public UserService(final UserDao userDao, final UserHistoryDao userHistoryDao) {
+        this.userDao = userDao;
+        this.userHistoryDao = userHistoryDao;
+    }
+
+    public User findById(final long id) {
+        return userDao.findById(id);
+    }
+
+    public void insert(final User user) {
+        userDao.insert(user);
+    }
+
+    public void changePassword(final long id, final String newPassword, final String createBy) {
+        final var user = findById(id);
+        user.changePassword(newPassword);
+        userDao.update(user);
+        userHistoryDao.log(new UserHistory(user, createBy));
+    }
+}

app/src/main/resources/schema.sql

@@ -5,3 +5,14 @@ create table if not exists users (
     email varchar(100) not null,
     primary key(id)
 );
+
+create table if not exists user_history (
+    id bigint auto_increment,
+    user_id bigint not null,
+    account varchar(100) not null,
+    password varchar(100) not null,
+    email varchar(100) not null,
+    created_at datetime not null,
+    created_by varchar(100) not null,
+    primary key(id)
+);

app/src/test/java/com/techcourse/dao/UserDaoTest.java

@@ -6,8 +6,6 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.util.List;
-
 import static org.assertj.core.api.Assertions.assertThat;
 
 class UserDaoTest {
@@ -19,52 +17,52 @@ void setup() {
         DatabasePopulatorUtils.execute(DataSourceConfig.getInstance());
 
         userDao = new UserDao(DataSourceConfig.getInstance());
-        final User user = new User("gugu", "password", "[email protected]");
+        final var user = new User("gugu", "password", "[email protected]");
         userDao.insert(user);
     }
 
     @Test
     void findAll() {
-        final List<User> users = userDao.findAll();
+        final var users = userDao.findAll();
 
         assertThat(users).isNotEmpty();
     }
 
     @Test
     void findById() {
-        final User user = userDao.findById(1L);
+        final var user = userDao.findById(1L);
 
         assertThat(user.getAccount()).isEqualTo("gugu");
     }
 
     @Test
     void findByAccount() {
-        final String account = "gugu";
-        final User user = userDao.findByAccount(account);
+        final var account = "gugu";
+        final var user = userDao.findByAccount(account);
 
         assertThat(user.getAccount()).isEqualTo(account);
     }
 
     @Test
     void insert() {
-        final String account = "insert-gugu";
-        final User user = new User(account, "password", "[email protected]");
+        final var account = "insert-gugu";
+        final var user = new User(account, "password", "[email protected]");
         userDao.insert(user);
 
-        final User actual = userDao.findById(2L);
+        final var actual = userDao.findById(2L);
 
         assertThat(actual.getAccount()).isEqualTo(account);
     }
 
     @Test
     void update() {
-        final String newPassword = "password99";
-        final User user = userDao.findById(1L);
+        final var newPassword = "password99";
+        final var user = userDao.findById(1L);
         user.changePassword(newPassword);
 
         userDao.update(user);
 
-        final User actual = userDao.findById(1L);
+        final var actual = userDao.findById(1L);
 
         assertThat(actual.getPassword()).isEqualTo(newPassword);
     }

app/src/test/java/com/techcourse/service/MockUserHistoryDao.java

@@ -0,0 +1,18 @@
+package com.techcourse.service;
+
+import com.techcourse.dao.UserHistoryDao;
+import com.techcourse.domain.UserHistory;
+import nextstep.jdbc.DataAccessException;
+import nextstep.jdbc.JdbcTemplate;
+
+public class MockUserHistoryDao extends UserHistoryDao {
+
+    public MockUserHistoryDao(final JdbcTemplate jdbcTemplate) {
+        super(jdbcTemplate);
+    }
+
+    @Override
+    public void log(final UserHistory userHistory) {
+        throw new DataAccessException();
+    }
+}

app/src/test/java/com/techcourse/service/UserServiceTest.java

@@ -0,0 +1,63 @@
+package com.techcourse.service;
+
+import com.techcourse.config.DataSourceConfig;
+import com.techcourse.dao.UserDao;
+import com.techcourse.dao.UserHistoryDao;
+import com.techcourse.domain.User;
+import com.techcourse.support.jdbc.init.DatabasePopulatorUtils;
+import nextstep.jdbc.DataAccessException;
+import nextstep.jdbc.JdbcTemplate;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+@Disabled
+class UserServiceTest {
+
+    private JdbcTemplate jdbcTemplate;
+    private UserDao userDao;
+
+    @BeforeEach
+    void setUp() {
+        this.jdbcTemplate = new JdbcTemplate(DataSourceConfig.getInstance());
+        this.userDao = new UserDao(jdbcTemplate);
+
+        DatabasePopulatorUtils.execute(DataSourceConfig.getInstance());
+        final var user = new User("gugu", "password", "[email protected]");
+        userDao.insert(user);
+    }
+
+    @Test
+    void testChangePassword() {
+        final var userHistoryDao = new UserHistoryDao(jdbcTemplate);
+        final var userService = new UserService(userDao, userHistoryDao);
+
+        final var newPassword = "qqqqq";
+        final var createBy = "gugu";
+        userService.changePassword(1L, newPassword, createBy);
+
+        final var actual = userService.findById(1L);
+
+        assertThat(actual.getPassword()).isEqualTo(newPassword);
+    }
+
+    @Test
+    void testTransactionRollback() {
+        // 트랜잭션 롤백 테스트를 위해 mock으로 교체
+        final var userHistoryDao = new MockUserHistoryDao(jdbcTemplate);
+        final var userService = new UserService(userDao, userHistoryDao);
+
+        final var newPassword = "newPassword";
+        final var createBy = "gugu";
+        // 트랜잭션이 정상 동작하는지 확인하기 위해 의도적으로 MockUserHistoryDao에서 예외를 발생시킨다.
+        assertThrows(DataAccessException.class,
+                () -> userService.changePassword(1L, newPassword, createBy));
+
+        final var actual = userService.findById(1L);
+
+        assertThat(actual.getPassword()).isNotEqualTo(newPassword);
+    }
+}

jdbc/build.gradle

@@ -7,6 +7,9 @@ repositories {
 }
 
 dependencies {
+    implementation 'org.springframework:spring-tx:5.3.23'
+    implementation 'org.springframework:spring-jdbc:5.3.23'
+
     implementation 'org.apache.commons:commons-lang3:3.12.0'
     implementation 'ch.qos.logback:logback-classic:1.2.10'
 
@@ -18,6 +21,6 @@ dependencies {
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
 }
 
-tasks.named('test') {
+test {
     useJUnitPlatform()
 }