16.DAO设计思想与搭建骨架_UserDaoImpl

package jdbc.domain.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import jdbc.domain.User;
import jdbc.domain.dao.DataException;
import jdbc.domain.dao.UserDao;
import test.jdbc.JdbcUtil;

public class UserDaoImpl implements UserDao {

public void addUser(User user) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "insert into user1(ID, NAME, BIRTHDAY, MONEY) values(?, ?, ?, ?)";
try {
conn = JdbcUtil.getConnection();
ps = conn.prepareStatement(sql);
ps.setInt(1, user.getId());
ps.setString(2, user.getName());
ps.setDate(3, new java.sql.Date(user.getBirthday().getTime()));
ps.setInt(4, user.getMoney());
ps.executeUpdate();
} catch (SQLException e) {
throw new DataException(e.getMessage(), e);
} finally {
JdbcUtil.free(rs, ps, conn);
}
}

public void deleteUser(User user) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "delete from user1 where id = ?";
try {
conn = JdbcUtil.getConnection();
ps = conn.prepareStatement(sql);
ps.setInt(1, user.getId());
ps.executeUpdate();
} catch (SQLException e) {
throw new DataException(e.getMessage(), e);
} finally {
JdbcUtil.free(rs, ps, conn);
}
}

public User findUser(String loginName, String password) {
String sql = "select id,name,birthday,money from user1 where name=?";
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
User user = null;
try {
conn = JdbcUtil.getConnection();
ps = conn.prepareStatement(sql);
ps.setString(1, loginName);
rs = ps.executeQuery();
while (rs.next()) {
user = mappingUser(rs);
}
} catch (SQLException e) {
throw new DataException(e.getMessage(), e);
} finally {
JdbcUtil.free(rs, ps, conn);
}
return user;
}

public User getUser(int id) {
String sql = "select id,name,birthday,money from user1 where id=?";
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
User user = null;
try {
conn = JdbcUtil.getConnection();
ps = conn.prepareStatement(sql);
ps.setInt(1, id);
rs = ps.executeQuery();
while (rs.next()) {
user = mappingUser(rs);
}
} catch (SQLException e) {
throw new DataException(e.getMessage(), e);
} finally {
JdbcUtil.free(rs, ps, conn);
}
return user;
}

private User mappingUser(ResultSet rs) throws SQLException {
User user;
user = new User();
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setBirthday(rs.getDate("birthday"));
user.setMoney(rs.getInt("money"));
return user;
}

public void updateUser(User user) {
String sql = "update user1 set NAME = ?, BIRTHDAY=? WHERE ID=?";
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = JdbcUtil.getConnection();
ps = conn.prepareStatement(sql);
ps.setString(1, user.getName());
ps.setDate(2, new java.sql.Date(user.getBirthday().getTime()));
ps.setInt(3, user.getId());
ps.executeUpdate();
} catch (SQLException e) {
throw new DataException(e.getMessage(), e);
} finally {
JdbcUtil.free(rs, ps, conn);
}
}

}