jdbcTemplate进行CRUD，查询结果转json

通过Spring的jdbcTemplate作为dao层的框架，将获取到的字段名，及其值，通过put放在jsonObject或jsonArray中，将json返回。

public class SpringJdbcService {
    private static Logger logger = LoggerFactory.getLogger(SpringJdbcService.class, SpringJdbcService.class.getName());

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 查询
     *
     * @return JSONArray json数组
     */
    public JSONArray getJSONArray(String sql, Object[] params) {
        return getJSONArray(sql, params, false);
    }

    public JSONArray getJSONArray(String sql, Object[] params, final boolean toUpper) {

        logger.info("get sql:" + sql);
        if (params != null && params.length > 0) {
            for (Object o : params) {
                logger.info("value:" + o);
            }
        }

        return jdbcTemplate.query(sql, params, new ResultSetExtractor<JSONArray>() {
            @Override
            public JSONArray extractData(ResultSet resultSet) throws SQLException, DataAccessException {
                ResultSetMetaData rsd = resultSet.getMetaData();
                int clength = rsd.getColumnCount();
                JSONArray ja = new JSONArray();
                String columnName;
                try {
                    while (resultSet.next()) {
                        JSONObject jo = new JSONObject();

                        for (int i = 0; i < clength; i++) {
                            columnName = rsd.getColumnLabel(i + 1);
                            columnName = toUpper ? columnName.toUpperCase() : columnName.toLowerCase();
                            jo.put(columnName, resultSet.getObject(i + 1));
                        }
                        ja.put(jo);
                    }
                } catch (Exception e) {

                }
                return ja;
            }
        });

    }

    public JSONObject getJSONObject(String sql) {
        return getJSONObject(sql, new Object[]{});
    }

    /**
     * 说明：查询，返回的是Json对象
     *
     * @return JSONObject
     */
    public JSONObject getJSONObject(String sql, Object[] params) {
        return getJSONObject(sql, params, false);
    }

    public JSONObject getJSONObject(String sql, Object[] params, final boolean toUpper) {
        logger.info("save sql:" + sql);
        if (params != null && params.length > 0) {
            for (Object o : params) {
                logger.info("value:" + o);
            }
        }
        return jdbcTemplate.query(sql, params, new ResultSetExtractor<JSONObject>() {
            @Override
            public JSONObject extractData(ResultSet resultSet) throws SQLException, DataAccessException {
                ResultSetMetaData rsd = resultSet.getMetaData();
                int clength = rsd.getColumnCount();
                String columnName;
                try {
                    if (resultSet.next()) {
                        JSONObject jo = new JSONObject();

                        for (int i = 0; i < clength; i++) {
                            columnName = rsd.getColumnLabel(i + 1);
                            columnName = toUpper ? columnName.toUpperCase() : columnName.toLowerCase();
                            jo.put(columnName, resultSet.getObject(i + 1));
                        }
                        return jo;
                    }
                } catch (Exception e) {

                }
                return null;
            }
        });

    }

    /**
     * 说明：插入数据
     *
     * @param sql
     * @param params
     * @return
     */
    public long insert(final String sql, final Object[] params) {
        logger.info("save sql:" + sql);
        if (params != null && params.length > 0) {
            for (Object o : params) {
                logger.info("value:" + o);
            }
        }

        KeyHolder keyHolder = new GeneratedKeyHolder();
        jdbcTemplate.update(new PreparedStatementCreator() {
            public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
                PreparedStatement ps = con.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
                if (params == null) {
                    return ps;
                }

                Object op = null;
                int alength = params.length;
                for (int i = 0; i < alength; ++i) {
                    op = params[i];
                    StatementCreatorUtils.setParameterValue(ps, i + 1, -2147483648, op);
                }
                return ps;
            }
        }, keyHolder);

        return keyHolder.getKey().longValue();
    }

    /**
     * 添加
     * Edited
     *
     * @param
     * @return int
     * <p>
     * 注册保存的save1/，勿调用！！！
     */
    public long save(final String sql, Object[] params) {
        logger.info("save sql:" + sql);
        if (params != null && params.length > 0) {
            for (Object o : params) {
                logger.info("value:" + o);
            }
        }
        KeyHolder keyHolder = new GeneratedKeyHolder();
        jdbcTemplate.update(new PreparedStatementCreator() {
            @Override
            public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
                PreparedStatement ps = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
                Blob b = connection.createBlob();

                return ps;
            }
        }, keyHolder);
        return keyHolder.getKey().longValue();
    }

    /**
     * 修改
     * Edited
     *
     * @param
     * @return int
     */
    public int update(String sql) {
        int flag = jdbcTemplate.update(sql);
        return flag;
    }

    /**
     * 说明：更新
     *
     * @param sql
     * @param params
     * @return
     */
    public int update(String sql, Object[] params) {
        logger.info("save sql:" + sql);
        if (params != null && params.length > 0) {
            for (Object o : params) {
                logger.info("value:" + o);
            }
        }
        return jdbcTemplate.update(sql, params);
    }