Spring JDBCTemplate Query方法查询

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


  public List<Item> 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;
  }

 }


}