Spring JdbcTemplate 查询方法中的RowMapper实现汇总

http://blog.chinaunix.net/uid-10018502-id-2972078.html

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;

}

}

}