Spring JdbcTemplate 使用总结

1、查询Object

    public Classify queryClassifById(int id){

        String sql="select * from t_classify where id=?";

        Object[] args = new Object[] { id };

        Classify classify = jdbcTemplate.queryForObject( sql, args, ParameterizedBeanPropertyRowMapper.newInstance(Classify.class));

        return classify;

    }

2、查询List

    public List<Classify> getAllMenu(){

        String sql="select * from t_classify";

        List<Classify> list = jdbcTemplate.query( sql, ParameterizedBeanPropertyRowMapper.newInstance(Classify.class));

        return list;

    }

3、查询记录数

    public int getCount(){

        String sql="select count(*) from t_classify";

        return jdbcTemplate.queryForInt(sql);

    }

4、获得自增长主键

    public int insert(final News news) {

        final String sql = "insert into t_news(title, content)"

                + " values(?,?)";

        KeyHolder keyHolder=new GeneratedKeyHolder();

        jdbcTemplate.update(new PreparedStatementCreator() {

            @Override

            public PreparedStatement createPreparedStatement(Connection conn)

                    throws SQLException {

                PreparedStatement ps=conn.prepareStatement(sql);

                ps.setString(1, news.getTitle());

                ps.setString(2, news.getContent());return ps;

            }

        },keyHolder);

        return keyHolder.getKey().intValue();

    }