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;
}
}
}
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