python向mysql中儲存JSON及Nodejs取出

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雖然把JSON資料存入mysql也是比較蛋疼，但是相比使用Nodejs嵌套處理多個mysql查詢並拼接返回資料也算是沒mongo時的一個折中方案了。

我使用python拼接了一個json格式的字串，卻遇到了一些問題

1，如果把json資料轉成str存入，那麼nodejs擷取資料的時候就無法使用json格式了

處理方法就是

import jsondata = json.dumps(data_dict, ensure_ascii=False)

通過dumps就可以把python的字典轉化成JSON

轉碼後的JSON資料如下，可以到http://www.bejson.com/ 去驗證JSON格式是否正確

{"tongji1": [{"sum_profit": 6032, "counts": 15, "win_counts": 8, "span": "09:15:00"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "09:45:00"}, {"sum_profit": 1542, "counts": 1, "win_counts": 1, "span": "10:15:00"}, {"sum_profit": 3084, "counts": 2, "win_counts": 2, "span": "10:45:00"}, {"sum_profit": 1122, "counts": 1, "win_counts": 1, "span": "11:15:00"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "13:15:00"}, {"sum_profit": -738, "counts": 1, "win_counts": 0, "span": "13:45:00"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "14:15:00"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "14:45:00"}], "tongji2": [{"sum_profit": 11042, "counts": 20, "win_counts": 12, "span": "1"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "16"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "31"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "6"}, {"sum_profit": 0, "counts": 0, "win_counts": 0, "span": "61"}], "tongji345": {"avg_lose": 8, "avg_win_span": 0, "avg_win": 1907, "avg_lose_span": 0, "avg_max_lose_day": 389, "avg_max_win_day": 813, "avg_trade_counts": 1}}

 

2，MySQLdb插入資料時的一些注意事項

sql = """insert into trades_info_f (id, data) values (‘%s‘, ‘%s‘)""" % (id,data)

如上代碼，使用""" """避免了JSON串的內部轉義雙引號，這樣就可以存入資料庫了

 

3，在Nodejs端擷取json資料

exports.tongji = (req, res) ->  openid = req.query.id  sql = "SELECT data from trades_info_f WHERE id = ‘" + id + "‘"   console.log sql   mysqldb.query sql, (err, rows, fields) ->    console.log err if err     console.log rows    console.log rows[0].data    data = JSON.parse(rows[0].data)    return res.jsonp {‘status‘:0, ‘message‘:‘ok‘, ‘data‘:data}

通過如下語句擷取的資料rows需要進一步的處理

如下的是未經處理資料

[ { data: ‘{"tongji1": [{"sum_profit": 42174, "counts": 784, "win_counts": 398, "span": "09:15:00"}, {"sum_profit": 14647, "counts": 757, "win_counts": 377, "span": "09:45:00"}, {"sum_profit": 51188, "counts": 757, "win_counts": 375, "span": "10:15:00"}, {"sum_profit": 72475, "counts": 771, "win_counts": 409, "span": "10:45:00"}, {"sum_profit": 4820, "counts": 689, "win_counts": 338, "span": "11:15:00"}, {"sum_profit": 57657, "counts": 691, "win_counts": 346, "span": "13:15:00"}, {"sum_profit": 73766, "counts": 718, "win_counts": 388, "span": "13:45:00"}, {"sum_profit": 267, "counts": 681, "win_counts": 327, "span": "14:15:00"}, {"sum_profit": 12207, "counts": 582, "win_counts": 303, "span": "14:45:00"}], "tongji2": [{"sum_profit": 469066, "counts": 5528, "win_counts": 2807, "span": "1"}, {"sum_profit": -150245, "counts": 142, "win_counts": 45, "span": "16"}, {"sum_profit": -51352, "counts": 19, "win_counts": 5, "span": "31"}, {"sum_profit": -113061, "counts": 1452, "win_counts": 751, "span": "6"}, {"sum_profit": -23535, "counts": 107, "win_counts": 48, "span": "61"}], "tongji345": {"avg_lose": 3592, "avg_win_span": 4, "avg_win": 625, "avg_lose_span": 4, "avg_max_lose_day": -2760, "avg_max_win_day": 1977, "avg_trade_counts": 41}}‘ } ]

rows[0].data就獲得了所需的str資料，之後使用JSON.parse()轉換為JSON資料

{"tongji1": [{"sum_profit": 42174, "counts": 784, "win_counts": 398, "span": "09:15:00"}, {"sum_profit": 14647, "counts": 757, "win_counts": 377, "span": "09:45:00"}, {"sum_profit": 51188, "counts": 757, "win_counts": 375, "span": "10:15:00"}, {"sum_profit": 72475, "counts": 771, "win_counts": 409, "span": "10:45:00"}, {"sum_profit": 4820, "counts": 689, "win_counts": 338, "span": "11:15:00"}, {"sum_profit": 57657, "counts": 691, "win_counts": 346, "span": "13:15:00"}, {"sum_profit": 73766, "counts": 718, "win_counts": 388, "span": "13:45:00"}, {"sum_profit": 267, "counts": 681, "win_counts": 327, "span": "14:15:00"}, {"sum_profit": 12207, "counts": 582, "win_counts": 303, "span": "14:45:00"}], "tongji2": [{"sum_profit": 469066, "counts": 5528, "win_counts": 2807, "span": "1"}, {"sum_profit": -150245, "counts": 142, "win_counts": 45, "span": "16"}, {"sum_profit": -51352, "counts": 19, "win_counts": 5, "span": "31"}, {"sum_profit": -113061, "counts": 1452, "win_counts": 751, "span": "6"}, {"sum_profit": -23535, "counts": 107, "win_counts": 48, "span": "61"}], "tongji345": {"avg_lose": 3592, "avg_win_span": 4, "avg_win": 625, "avg_lose_span": 4, "avg_max_lose_day": -2760, "avg_max_win_day": 1977, "avg_trade_counts": 41}}

 OK，開啟Postman，格式正確了

 

python向mysql中儲存JSON及Nodejs取出