Spring JdbcTemplate 查询方法中的RowMapper实现汇总

实现一、在内部建立内联类实现RowMapper接口
package hysteria.contact.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import hysteria.contact.dao.ItemDAO;
import hysteria.contact.domain.Item;

public class ItemDAOImpl implements ItemDAO {
private JdbcTemplate jdbcTemplate;

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

public Item insert(Item item) {
   String sql = "INSERT INTO items(user_id,name,phone,email) VALUES(?,?,?,?)";
   Object[] params = new Object[]{item.getUserId(),item.getName(),item.getPhone(),item.getEmail()};
  int[] types = new int[]{Types.INTEGER,Types.VARCHAR,Types.CHAR,Types.VARCHAR};
   jdbcTemplate.update(sql,params,types);
  return item;
}

public Item update(Item item) {
   String sql = "UPDATE items SET name = ?, phone = ?, email = ? WHERE id = ?";
   Object[] params = new Object[] {item.getName(),item.getPhone(),item.getEmail(),item.getId()};
  int[] types = new int[] {Types.VARCHAR,Types.CHAR,Types.VARCHAR,Types.VARCHAR,Types.INTEGER};
   jdbcTemplate.update(sql,params,types);

  return item;
}

public void delete(Item item) {
   String sql = "DELETE FROM items WHERE id = ?";
   Object[] params = new Object[] {item.getId()};
  int[] types = new int[]{Types.INTEGER};
   jdbcTemplate.update(sql,params,types);
}

public Item findById(int id) {
   String sql = "SELECT * FROM items WHERE id = ?";
   Object[] params = new Object[] {id};
  int[] types = new int[] {Types.INTEGER};
   List items = jdbcTemplate.query(sql,params,types,new ItemMapper());
  if(items.isEmpty()){
   return null;
   }
  return (Item)items.get(0);
}

public List findAll() {
   String sql = "SELECT * FROM items";
  return jdbcTemplate.query(sql,new ItemMapper());
}


public List findAllByUser(int user_id) {
   String sql = "SELECT * FROM items WHERE user_id = ?";
   Object[] params = new Object[]{user_id};
  int[] types = new int[]{Types.INTEGER};
   List items = jdbcTemplate.query(sql,params,types,new ItemMapper());
  return items;
}

protected class ItemMapper implements RowMapper {

  public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
    Item item = new Item();
    item.setId(rs.getInt("id"));
    item.setUserId(rs.getInt("user_id"));
    item.setName(rs.getString("name"));
    item.setPhone(rs.getString("phone"));
    item.setEmail(rs.getString("email"));

   return item;
   }

}


}