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#21 jdbc: refactoring

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This commit is contained in:
haerong22
2022-09-20 01:59:05 +09:00
parent 53c5d34a3b
commit 67c8588ada
5 changed files with 123 additions and 67 deletions
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39
my-framework/jdbc-practice/src/main/java/org/example/ConnectionManager.java
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@@ -3,15 +3,40 @@ package org.example;
import com.zaxxer.hikari.HikariDataSource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
public class ConnectionManager {
public static DataSource getDataSource() {
HikariDataSource hikariDataSource = new HikariDataSource();
hikariDataSource.setDriverClassName("org.h2.Driver");
hikariDataSource.setJdbcUrl("jdbc:h2:mem://localhost/~/jdbc-practice;MODE=MySQL;DB_CLOSE_DELAY=-1");
hikariDataSource.setUsername("sa");
hikariDataSource.setPassword("");
return hikariDataSource;
public static final String DB_DRIVER = "org.h2.Driver";
public static final String DB_URL = "jdbc:h2:mem://localhost/~/jdbc-practice;MODE=MySQL;DB_CLOSE_DELAY=-1";
public static final String DB_USERNAME = "sa";
public static final String DB_PASSWORD = "";
public static final int DB_MAX_POOL_SIZE = 40;
private static final DataSource ds;
static {
HikariDataSource hikariDataSource = new HikariDataSource();
hikariDataSource.setDriverClassName(DB_DRIVER);
hikariDataSource.setJdbcUrl(DB_URL);
hikariDataSource.setUsername(DB_USERNAME);
hikariDataSource.setPassword(DB_PASSWORD);
hikariDataSource.setMaximumPoolSize(DB_MAX_POOL_SIZE);
hikariDataSource.setMinimumIdle(DB_MAX_POOL_SIZE);
ds = hikariDataSource;
}
public static Connection getConnection() {
try {
return ds.getConnection();
} catch (SQLException e) {
throw new IllegalStateException(e);
}
}
public static DataSource getDataSource() {
return ds;
}
}

62
my-framework/jdbc-practice/src/main/java/org/example/JdbcTemplate.java Normal file
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@@ -0,0 +1,62 @@
package org.example;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class JdbcTemplate {
public void executeUpdate(User user, String sql, PreparedStatementSetter pss) throws SQLException {
Connection con = null;
PreparedStatement pstmt = null;
try {
con = ConnectionManager.getConnection();
pstmt = con.prepareStatement(sql);
pss.setter(pstmt);
pstmt.executeUpdate();
} finally {
if (pstmt != null) {
pstmt.close();
}
if (con != null) {
con.close();
}
}
}
public Object executeQuery(String sql, PreparedStatementSetter pss, RowMapper rowMapper) throws SQLException {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
con = ConnectionManager.getConnection();
pstmt = con.prepareStatement(sql);
pss.setter(pstmt);
rs = pstmt.executeQuery();
Object obj = null;
if (rs.next()) {
obj = rowMapper.map(rs);
}
return obj;
} finally {
if (rs != null) {
rs.close();
}
if (pstmt != null) {
pstmt.close();
}
if (con != null) {
con.close();
}
}
}
}

9
my-framework/jdbc-practice/src/main/java/org/example/PreparedStatementSetter.java Normal file
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@@ -0,0 +1,9 @@
package org.example;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public interface PreparedStatementSetter {
void setter(PreparedStatement pstmt) throws SQLException;
}

9
my-framework/jdbc-practice/src/main/java/org/example/RowMapper.java Normal file
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@@ -0,0 +1,9 @@
package org.example;
import java.sql.ResultSet;
import java.sql.SQLException;
public interface RowMapper {
Object map(ResultSet rs) throws SQLException;
}

71
my-framework/jdbc-practice/src/main/java/org/example/UserDao.java
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@@ -4,80 +4,31 @@ import java.sql.*;
public class UserDao {
private Connection getConnection() {
String url = "jdbc:h2:mem://localhost/~/jdbc-practice;MODE=MySQL;DB_CLOSE_DELAY=-1";
String id = "sa";
String pw = "";
try {
Class.forName("org.h2.Driver");
return DriverManager.getConnection(url, id, pw);
} catch (Exception e) {
return null;
}
}
public void create(User user) throws SQLException {
Connection con = null;
PreparedStatement pstmt = null;
JdbcTemplate jdbcTemplate = new JdbcTemplate();
try {
con = getConnection();
String sql = "INSERT INTO USERS VALUES (?, ?, ?, ?)";
String sql = "INSERT INTO USERS VALUES (?, ?, ?, ?)";
pstmt = con.prepareStatement(sql);
jdbcTemplate.executeUpdate(user, sql, pstmt -> {
pstmt.setString(1, user.getUserId());
pstmt.setString(2, user.getPassword());
pstmt.setString(3, user.getName());
pstmt.setString(4, user.getEmail());
pstmt.executeUpdate();
} finally {
if (pstmt != null) {
pstmt.close();
}
if (con != null) {
con.close();
}
}
});
}
public User findByUserId(String userId) throws SQLException {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
JdbcTemplate jdbcTemplate = new JdbcTemplate();
String sql = "SELECT userId, password, name, email FROM USERS WHERE userId = ?";
try {
con = getConnection();
String sql = "SELECT userId, password, name, email FROM USERS WHERE userId = ?";
pstmt = con.prepareStatement(sql);
pstmt.setString(1, userId);
rs = pstmt.executeQuery();
User user = null;
if (rs.next()) {
user = new User(
return (User) jdbcTemplate.executeQuery(
sql,
(pstmt) -> pstmt.setString(1, userId),
(rs) -> new User(
rs.getString("userId"),
rs.getString("password"),
rs.getString("name"),
rs.getString("email")
);
}
return user;
} finally {
if (rs != null) {
rs.close();
}
if (pstmt != null) {
pstmt.close();
}
if (con != null) {
con.close();
}
}
));
}
}