我一直在使用Cassandra的DB 2.0.1(CQL 3)解壓卡桑德拉地圖類型
CREATE TABLE fans (id text PRIMARY KEY, fans map<text, text>);
INSERT INTO fans (id, fans) VALUES ('John', {'fruit' : 'apple', 'band' : 'Beatles'});
UPDATE fans SET fans = fans + {'movie' : 'Cassablanca'} WHERE id = 'John';
它工作的優良創建了一些數據。
cqlsh:testdb> SELECT * FROM fans;
id | fans
------+---------------------------------------------------------------
John | {'band': 'Beatles', 'fruit': 'apple', 'movie': 'Cassablanca'}
(1 rows)
現在我試圖用PHP(thobbs/phpcassa v1.1.0)獲取數據。
include_once ("/include/autoload.php");
$pool = new phpcassa\Connection\ConnectionPool('testdb');
$connection = $pool->get();
$rows = $connection->client->execute_cql3_query("SELECT id, fans FROM fans", cassandra\Compression::NONE, cassandra\ConsistencyLevel::ONE);
var_dump($rows->rows);
$pool->return_connection($connection);
unset($connection);
$pool->close();
它也工作正常。
array (size=1)
0 =>
object(cassandra\CqlRow)[10]
public 'key' => string '' (length=0)
public 'columns' =>
array (size=2)
0 =>
object(cassandra\Column)[11]
public 'name' => string 'id' (length=2)
public 'value' => string 'John' (length=4)
public 'timestamp' => null
public 'ttl' => null
1 =>
object(cassandra\Column)[12]
public 'name' => string 'fans' (length=4)
public 'value' => string '��band�Beatles�fruit�apple�movie�Cassablanca' (length=51)
public 'timestamp' => null
public 'ttl' => null
的問題是如何打開該表示爲圖中的值? 我可以看到
��band�Beatles�fruit�apple�movie�Cassablanca
,我知道這是showld
{'band': 'Beatles', 'fruit': 'apple', 'movie': 'Cassablanca'}
是否有任何內部功能反序列化或解包編碼字符串轉換成地圖或數組?
我wroute一個功能讀取不可打印符號:
function unistr_to_ords($str, $encoding = 'UTF-8') {
$str = mb_convert_encoding($str, 'UCS-4BE', $encoding);
$ords = array();
for ($i = 0; $i < mb_strlen($str, 'UCS-4BE'); $i++) {
$s2 = mb_substr($str, $i, 1, 'UCS-4BE');
$val = unpack('N', $s2);
$ords[] = $val[1];
}
return($ords);
}
當我嘗試將其與值I看到以下結果:
array (size=51)
0 => int 0
1 => int 3
2 => int 0
3 => int 4
4 => int 98
5 => int 97
6 => int 110
7 => int 100
8 => int 0
9 => int 7
10 => int 66
11 => int 101
12 => int 97
13 => int 116
14 => int 108
15 => int 101
16 => int 115
17 => int 0
18 => int 5
19 => int 102
20 => int 114
21 => int 117
22 => int 105
23 => int 116
24 => int 0
25 => int 5
26 => int 97
27 => int 112
28 => int 112
29 => int 108
30 => int 101
31 => int 0
32 => int 5
33 => int 109
34 => int 111
35 => int 118
36 => int 105
37 => int 101
38 => int 0
39 => int 11
40 => int 67
41 => int 97
42 => int 115
43 => int 115
44 => int 97
45 => int 98
46 => int 108
47 => int 97
48 => int 110
49 => int 99
50 => int 97
正如我理解0(零)是一個分離器,在0之後是一個長度,例如第一個03表示地圖中的3個項目。那麼04意味着4是單詞'band'的長度,那麼07意味着單詞'Beatles'的長度爲7的新單詞等等。
但是是否有任何內部提取地圖,列表或集的內置方法或函數?