[JDBC 라이브러리 구현하기 - 1단계] 에밀(김대희) 미션 제출합니다.

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

@@ -1,121 +1,68 @@
 package com.techcourse.dao;
 
 import com.techcourse.domain.User;
-import org.springframework.jdbc.core.JdbcTemplate;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.sql.DataSource;
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
 import java.util.List;
+import org.springframework.jdbc.core.JdbcTemplate;
 
 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 = null;
+        this.jdbcTemplate = jdbcTemplate;
     }
 
     public void insert(final User user) {
         final var sql = "insert into users (account, password, email) values (?, ?, ?)";
 
-        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) {}
-        }
+        jdbcTemplate.execute(sql, ps -> {
+            ps.setString(1, user.getAccount());
+            ps.setString(2, user.getPassword());
+            ps.setString(3, user.getEmail());
+        });
     }
 
     public void update(final User user) {
-        // todo
+        final var sql = "update users set account = ?, password = ?, email = ? where id = ?";
+
+        jdbcTemplate.execute(sql, ps -> {
+            ps.setString(1, user.getAccount());
+            ps.setString(2, user.getPassword());
+            ps.setString(3, user.getEmail());
+            ps.setLong(4, user.getId());
+        });
     }
 
     public List<User> findAll() {
-        // todo
-        return null;
+        final var sql = "select id, account, password, email from users";
+
+        return jdbcTemplate.queryAll(sql, rs -> new User(
+            rs.getLong(1),
+            rs.getString(2),
+            rs.getString(3),
+            rs.getString(4)
+        ));
     }
 
     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) {}
-        }
+        return jdbcTemplate.query(sql,  rs -> new User(
+            rs.getLong(1),
+            rs.getString(2),
+            rs.getString(3),
+            rs.getString(4)
+        ), id);
     }
 
     public User findByAccount(final String account) {
-        // todo
-        return null;
+        final var sql = "select id, account, password, email from users where account = ?";
+
+        return jdbcTemplate.query(sql,  rs -> new User(
+            rs.getLong(1),
+            rs.getString(2),
+            rs.getString(3),
+            rs.getString(4)
+        ), account);
     }
 }

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", "[email protected]");
         userDao.insert(user);
     }

jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java

@@ -1,9 +1,16 @@
 package org.springframework.jdbc.core;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.sql.DataSource;
+import org.springframework.dao.DataAccessException;
 
 public class JdbcTemplate {
 
@@ -14,4 +21,121 @@ public class JdbcTemplate {
     public JdbcTemplate(final DataSource dataSource) {
         this.dataSource = dataSource;
     }
+
+
+    public DataSource getDataSource() {
+        return dataSource;
+    }
+
+    public void execute(String sql, MyPreparedStatementCallback myPreparedStatementCallback) {
+        Connection conn = null;
+        PreparedStatement pstmt = null;
+
+        try {
+            conn = dataSource.getConnection();
+
+            log.info("query: {}", sql);
+            pstmt = conn.prepareStatement(sql);
+
+            myPreparedStatementCallback.execute(pstmt);
+            pstmt.executeUpdate();
+        } catch (SQLException e) {
+            throw new DataAccessException(e);
+        } finally {
+            try {
+                if (pstmt != null) {
+                    pstmt.close();
+                }
+            } catch (SQLException ignored) {}
+
+            try {
+                if (conn != null) {
+                    conn.close();
+                }
+            } catch (SQLException ignored) {}
+        }
+    }
+
+    public <T> List<T> queryAll(String sql, ObjectMapper<T> objectMapper, Object... params) {
+        Connection conn = null;
+        PreparedStatement pstmt = null;
+        ResultSet rs = null;
+        try {
+            conn = dataSource.getConnection();
+
+            log.info("query: {}", sql);
+            pstmt = conn.prepareStatement(sql);
+            for (int i = 1; i <= params.length; i++) {
+                pstmt.setObject(i, params[i - 1]);
+            }
+            rs = pstmt.executeQuery();
+
+            List<T> list = new ArrayList<>();
+            while (rs.next()) {
+                list.add(objectMapper.map(rs));
+            }
+            return list;
+        } catch (SQLException e) {
+            throw new DataAccessException(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) {}
+        }
+    }
+
+    public <T> T query(String sql, ObjectMapper<T> objectMapper, Object... params) {
+        Connection conn = null;
+        PreparedStatement pstmt = null;
+        ResultSet rs = null;
+        try {
+            conn = dataSource.getConnection();
+
+            log.info("query: {}", sql);
+            pstmt = conn.prepareStatement(sql);
+            for (int i = 1; i <= params.length; i++) {
+                pstmt.setObject(i, params[i - 1]);
+            }
+            rs = pstmt.executeQuery();
+
+            if (rs.next()) {
+                return objectMapper.map(rs);
+            }
+            return null;
+        } catch (SQLException e) {
+            throw new DataAccessException(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) {}
+        }
+    }
 }

jdbc/src/main/java/org/springframework/jdbc/core/MyPreparedStatementCallback.java

@@ -0,0 +1,11 @@
+package org.springframework.jdbc.core;
+
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+@FunctionalInterface
+public interface MyPreparedStatementCallback {
+
+    void execute(PreparedStatement pstmt) throws SQLException;
+
+}

jdbc/src/main/java/org/springframework/jdbc/core/ObjectMapper.java

@@ -0,0 +1,10 @@
+package org.springframework.jdbc.core;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@FunctionalInterface
+public interface ObjectMapper<T> {
+
+    T map(ResultSet rs) throws SQLException;
+}

study/src/main/java/aop/config/DataSourceConfig.java

@@ -14,6 +14,7 @@ public class DataSourceConfig {
     public DataSource dataSource() {
         return new EmbeddedDatabaseBuilder()
                 .setType(EmbeddedDatabaseType.H2)
+                .setName("test;DB_CLOSE_DELAY=-1;MODE=MYSQL;")
                 .addScript("classpath:schema.sql")
                 .build();
     }

study/src/main/resources/application.yml

@@ -1,5 +1,6 @@
 spring:
   jpa:
+    open-in-view: false
     show-sql: true
     generate-ddl: true
     hibernate: