Question

spring得rowmapper进不去都有什么原因

spring得rowmapper进不去都有什么原因

Answer 1

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<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;
}

}

}