查询Aerospike中的地图的钥匙

我试图在aerospike中存储地图，并根据地图的关键点获取数据。查询Aerospike中的地图的钥匙

首先，我创建了完事指数在那里我存储地图

aql> create mapkeys index status on test.myset (state) String 
aql> show indexes 
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+ 
| ns  | bin  | indextype | set  | state | indexname | path | sync_state | type  | 
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+ 
| "test" | "state" | "MAPKEYS" | "myset" | "RW" | "status" | "state" | "synced" | "STRING" | 
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+ 
1 row in set (0.000 secs) 
OK

然后我用Java客户端存储地图

AerospikeClient client = new AerospikeClient("127.0.0.1",3000); 

    WritePolicy writePolicy = new WritePolicy(); 
    writePolicy.timeout=500; 

    for(int i = 1;i<10;i++){ 
     Key key = new Key("test","myset",""+i); 
     client.delete(writePolicy, key); 

     HashMap<String,String> map = new HashMap<String,String>(); 
     map.put("key1", "string1"); 
     map.put("key2", "string2"); 
     map.put("key3", "string3"); 

     Bin bin = new Bin("state", map); 
     client.put(writePolicy, key, bin); 

    }

我通过APL和检查数据数据显然存在。

aql> select * from test.myset 
+--------------------------------------------------------+ 
| state             | 
+--------------------------------------------------------+ 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
| {"key1":"string1", "key2":"string2", "key3":"string3"} | 
+--------------------------------------------------------+ 
10 rows in set (0.019 secs)

现在，当我尝试查询基于索引创建它给

aql> select * from test.myset where status = 'key1' 
0 rows in set (0.000 secs) 
Error: (204) AEROSPIKE_ERR_INDEX 

aql> select * from test.myset where state = 'key1' 
0 rows in set (0.000 secs) 
Error: (201) AEROSPIKE_ERR_INDEX_NOT_FOUND

有人可以帮助我。我搜索了那个错误，但没有找到任何信息。谢谢。

来源

2016-04-03 Pardha.Saradhi

在我们深入挖掘之前，你的意思是做'where state ='而不是'where status ='？ – Aaron

@Aaron，我试着使用状态，它给出了一个不同的错误。相应地更新问题。 –

除了数字，字符串和Geo2DSphere类型之外，Aerospike支持MapKeys，MapValues，Lists上的二级索引。

对于您的情况，您可以按照以下方式在Mapkey上进行查询。

select * from test.myset in mapkeys where state='key1'

这应该会返回结果。

在AQL，如果你输入的帮助，你应该得到的查询

SELECT <bins> FROM <ns>[.<set>] 
    SELECT <bins> FROM <ns>[.<set>] WHERE <bin> = <value> 
    SELECT <bins> FROM <ns>[.<set>] WHERE <bin> BETWEEN <lower> AND <upper> 
    SELECT <bins> FROM <ns>[.<set>] WHERE PK = <key> 
    SELECT <bins> FROM <ns>[.<set>] IN <indextype> WHERE <bin> = <value> 
    SELECT <bins> FROM <ns>[.<set>] IN <indextype> WHERE <bin> BETWEEN <lower> AND <upper>

以下同样，您可以运行的MapValue查询也是如此。

来源

2016-04-06 07:52:24 Aveek

更新：

由于塞式3.8.1，Secondary Index on List and Map are officially supported的。

原始响应：

查询通过在地图上的键，图值，或列表值次要索引是 not officially supported yet。

也就是说，功能和语法有些可用。您需要：

与MAPKEYS类型，MAPVALUES或LIST（你使用类型STRING此刻）
Select如下（你缺少的部分IN MAPKEYS）创建辅助索引：

SELECT * FROM namespace.setname IN MAPKEYS WHERE bin = 'keyValue'

如果在AQL控制台中键入help，则查询语法以及其他一些位可用。

来源

2016-04-04 17:10:44 Aaron

查询Aerospike中的地图的钥匙

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