diff --git a/app/src/main/java/com/techcourse/dao/UserDao.java b/app/src/main/java/com/techcourse/dao/UserDao.java
index e7603b5451..7817ef7587 100644
--- a/app/src/main/java/com/techcourse/dao/UserDao.java
+++ b/app/src/main/java/com/techcourse/dao/UserDao.java
@@ -4,252 +4,50 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
 
-import javax.sql.DataSource;
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.util.ArrayList;
 import java.util.List;
 
 public class UserDao {
 
     private static final Logger log = LoggerFactory.getLogger(UserDao.class);
 
-    private final DataSource dataSource;
-
-    public UserDao(final DataSource dataSource) {
-        this.dataSource = dataSource;
-    }
+    private final JdbcTemplate jdbcTemplate;
 
     public UserDao(final JdbcTemplate jdbcTemplate) {
-        this.dataSource = (DataSource) jdbcTemplate;
+        this.jdbcTemplate = jdbcTemplate;
     }
 
     public void insert(final User user) {
-        final var sql = "insert into users (account, password, email) values (?, ?, ?)";
-
-        Connection connection = null;
-        PreparedStatement preparedStatement = null;
-        try {
-            connection = dataSource.getConnection();
-            preparedStatement = connection.prepareStatement(sql);
-
-            log.debug("query : {}", sql);
-
-            preparedStatement.setString(1, user.getAccount());
-            preparedStatement.setString(2, user.getPassword());
-            preparedStatement.setString(3, user.getEmail());
-            preparedStatement.executeUpdate();
-        } catch (SQLException e) {
-            log.error(e.getMessage(), e);
-            throw new RuntimeException(e);
-        } finally {
-            try {
-                if (preparedStatement != null) {
-                    preparedStatement.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (connection != null) {
-                    connection.close();
-                }
-            } catch (SQLException ignored) {
-            }
-        }
+        String sql = "insert into users (account, password, email) values (?, ?, ?)";
+        jdbcTemplate.update(sql, user.getAccount(), user.getPassword(), user.getEmail());
     }
 
     public void update(final User user) {
-        // todo
-
-        final String sql = "UPDATE users SET account = ?, password = ? WHERE email = ?";
-
-        Connection conn = null;
-        PreparedStatement pstmt = null;
-        try {
-            conn = dataSource.getConnection();
-            pstmt = conn.prepareStatement(sql);
-
-            log.debug("query : {}", sql);
-
-            pstmt.setString(1, user.getAccount());
-            pstmt.setString(2, user.getPassword());
-            pstmt.setString(3, user.getEmail());
-            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) {
-            }
-        }
+        String sql = "UPDATE users SET account = ?, password = ? WHERE email = ?";
+        jdbcTemplate.update(sql, user.getAccount(), user.getPassword(), user.getEmail());
     }
 
     public List<User> findAll() {
-        // todo
-
-        final String sql = "SELECT id, account, password, email FROM users";
-
-        Connection conn = null;
-        PreparedStatement pstmt = null;
-        ResultSet rs = null;
-        List<User> userList = new ArrayList<>();
-
-        try {
-            conn = dataSource.getConnection();
-            pstmt = conn.prepareStatement(sql);
-            rs = pstmt.executeQuery();
-
-            log.debug("query : {}", sql);
-
-            while (rs.next()) {
-                User user = new User(
-                        rs.getLong("id"),
-                        rs.getString("account"),
-                        rs.getString("password"),
-                        rs.getString("email")
-                );
-                userList.add(user);
-            }
-            return userList;
-        } catch (SQLException e) {
-            log.error(e.getMessage(), e);
-            throw new RuntimeException(e);
-        } finally {
-            try {
-                if (rs != null) {
-                    rs.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (pstmt != null) {
-                    pstmt.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (conn != null) {
-                    conn.close();
-                }
-            } catch (SQLException ignored) {
-            }
-        }
+        String sql = "SELECT id, account, password, email FROM users";
+        return jdbcTemplate.query(sql, rowMapper());
     }
 
     public User findById(final Long id) {
-        final var sql = "select id, account, password, email from users where id = ?";
-
-        Connection conn = null;
-        PreparedStatement pstmt = null;
-        ResultSet rs = null;
-        try {
-            conn = dataSource.getConnection();
-            pstmt = conn.prepareStatement(sql);
-            pstmt.setLong(1, id);
-            rs = pstmt.executeQuery();
-
-            log.debug("query : {}", sql);
-
-            if (rs.next()) {
-                return new User(
-                        rs.getLong(1),
-                        rs.getString(2),
-                        rs.getString(3),
-                        rs.getString(4));
-            }
-            return null;
-        } catch (SQLException e) {
-            log.error(e.getMessage(), e);
-            throw new RuntimeException(e);
-        } finally {
-            try {
-                if (rs != null) {
-                    rs.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (pstmt != null) {
-                    pstmt.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (conn != null) {
-                    conn.close();
-                }
-            } catch (SQLException ignored) {
-            }
-        }
+        String sql = "select id, account, password, email from users where id = ?";
+        return jdbcTemplate.queryForObject(sql, rowMapper(), id);
     }
 
     public User findByAccount(final String account) {
-        // todo
-
-        final var sql = "select id, account, password, email from users where account = ?";
-
-        Connection conn = null;
-        PreparedStatement pstmt = null;
-        ResultSet rs = null;
-        try {
-            conn = dataSource.getConnection();
-            pstmt = conn.prepareStatement(sql);
-            pstmt.setString(1, account);
-            rs = pstmt.executeQuery();
-
-            log.debug("query : {}", sql);
-
-            if (rs.next()) {
-                return new User(
-                        rs.getLong(1),
-                        rs.getString(2),
-                        rs.getString(3),
-                        rs.getString(4));
-            }
-            return null;
-        } catch (SQLException e) {
-            log.error(e.getMessage(), e);
-            throw new RuntimeException(e);
-        } finally {
-            try {
-                if (rs != null) {
-                    rs.close();
-                }
-            } catch (SQLException ignored) {
-            }
-
-            try {
-                if (pstmt != null) {
-                    pstmt.close();
-                }
-            } catch (SQLException ignored) {
-            }
+        String sql = "select id, account, password, email from users where account = ?";
+        return jdbcTemplate.queryForObject(sql, rowMapper(), account);
+    }
 
-            try {
-                if (conn != null) {
-                    conn.close();
-                }
-            } catch (SQLException ignored) {
-            }
-        }
+    private RowMapper<User> rowMapper() {
+        return (resultSet) -> new User(
+                resultSet.getLong("id"),
+                resultSet.getString("account"),
+                resultSet.getString("password"),
+                resultSet.getString("email"));
     }
 }
diff --git a/app/src/test/java/com/techcourse/dao/UserDaoTest.java b/app/src/test/java/com/techcourse/dao/UserDaoTest.java
index 773d7faf82..7e9cc2b01a 100644
--- a/app/src/test/java/com/techcourse/dao/UserDaoTest.java
+++ b/app/src/test/java/com/techcourse/dao/UserDaoTest.java
@@ -5,6 +5,7 @@
 import com.techcourse.support.jdbc.init.DatabasePopulatorUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.springframework.jdbc.core.JdbcTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -16,7 +17,7 @@ class UserDaoTest {
     void setup() {
         DatabasePopulatorUtils.execute(DataSourceConfig.getInstance());
 
-        userDao = new UserDao(DataSourceConfig.getInstance());
+        userDao = new UserDao(new JdbcTemplate(DataSourceConfig.getInstance()));
         final var user = new User("gugu", "password", "hkkang@woowahan.com");
         userDao.insert(user);
     }