Spring中JdbcTemplate中使用RowMapper

Spring中JdbcTemplate中使用RowMapper

博客分类：

 
• spring

 

package com.cxl.demo.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import com.cxl.demo.entity.User;
public class UserDaoImpl {
    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public List<User> getUserByName(String username) {
        String sql = "select * from t_user where username = ?";
        Object[] params = new Object[] { username };
        List<User> users = null;
        /**
         * 使用接口实现类
         */
        users = jdbcTemplate.query(sql, params, new UserRowMapper());
        /**
         * 使用匿名内部类
         * 如果UserRowMapper类只使用一次，单独为其创建一个类多余，可以使用匿名类
         * 省略了书写一个实现类
         */
        users = jdbcTemplate.query(sql, params,
                new RowMapper<User>() {
                    @Override
                    public User mapRow(ResultSet rs, int rowNum) throws SQLException {
                        User user = new User();
                        user.setId(rs.getInt("id"));
                        user.setUsername(rs.getString("username"));
                        user.setPassword(rs.getString("password"));
                        return user;
                    }
                });
        return (users != null && users.size() > 0) ? users : null;
    }

    public class UserRowMapper implements RowMapper<User> {

        @Override
        public User mapRow(ResultSet rs, int rowNum) throws SQLException {
            User user = new User();
            user.setId(rs.getInt("id"));
            user.setUsername(rs.getString("username"));
            user.setPassword(rs.getString("password"));
            return user;
        }

    }
}