{"id":50139,"date":"2023-02-08T00:13:11","date_gmt":"2024-02-04T19:32:18","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%89%8d%e5%be%80cassandra-day%e7%9a%84%e8%b7%af%e4%b8%8a%e3%80%91%e4%bd%bf%e7%94%a8%e5%af%b9%e8%b1%a1%e6%98%a0%e5%b0%84%e8%bf%9b%e8%a1%8c%e6%95%b0%e6%8d%ae%e5%ba%93%e7%bc%96%e7%a8%8b\/"},"modified":"2024-04-29T13:35:58","modified_gmt":"2024-04-29T05:35:58","slug":"%e3%80%90%e5%89%8d%e5%be%80cassandra-day%e7%9a%84%e8%b7%af%e4%b8%8a%e3%80%91%e4%bd%bf%e7%94%a8%e5%af%b9%e8%b1%a1%e6%98%a0%e5%b0%84%e8%bf%9b%e8%a1%8c%e6%95%b0%e6%8d%ae%e5%ba%93%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%89%8d%e5%be%80cassandra-day%e7%9a%84%e8%b7%af%e4%b8%8a%e3%80%91%e4%bd%bf%e7%94%a8%e5%af%b9%e8%b1%a1%e6%98%a0%e5%b0%84%e8%bf%9b%e8%a1%8c%e6%95%b0%e6%8d%ae%e5%ba%93%e7%bc%96%e7%a8%8b\/","title":{"rendered":"\u3010\u524d\u5f80Cassandra Day\u7684\u8def\u4e0a\u3011\u4f7f\u7528\u5bf9\u8c61\u6620\u5c04\u8fdb\u884c\u6570\u636e\u5e93\u7f16\u7a0b\uff08Python\uff09"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u4e1c\u4eac\u7684\u5361\u6851\u5fb7\u62c9\u65e5<\/h2>\n

\u4eca\u5e74\u76846\u67081\u65e5\uff0cCassandra Day\u5c06\u5728\u65e5\u672c\u4e3e\u529e\u3002\u53bb\u5e74\uff0cCassandra Day\u5df2\u7ecf\u5728\u67cf\u6797\u3001\u4f26\u6566\u3001\u963f\u59c6\u65af\u7279\u4e39\u3001\u6cb3\u5185\u3001\u96c5\u52a0\u8fbe\u3001\u4f11\u65af\u987f\u3001\u5723\u514b\u62c9\u62c9\u3001\u897f\u96c5\u56fe\u548c\u65b0\u52a0\u5761\u6210\u529f\u4e3e\u529e\u8fc7\u3002<\/p>\n

\u8fd9\u6b21\u5728\u4e1c\u4eac\u4e3e\u529e\u6d3b\u52a8\uff0c\u6211\u4eec\u5c06\u53d1\u5e03\u4e0eApache Cassandra\u76f8\u5173\u7684\u6587\u7ae0\u3002<\/p>\n

\"image.png\"<\/div>\n

\u5173\u4e8eApache Cassandra<\/h2>\n

Apache Cassandra\u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u3002<\/p>\n

\u4e0e\u5176\u4ed6\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u76f8\u540c\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u591a\u4e2a\u901a\u7528\u670d\u52a1\u5668\u6765\u6784\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\uff08\u4e3a\u4e86\u5f00\u53d1\u7b49\u76ee\u7684\uff0c\u4e5f\u53ef\u4ee5\u53ea\u4f7f\u7528\u4e00\u4e2a\u670d\u52a1\u5668\u6765\u6784\u5efa\uff09\u3002<\/p>\n

\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u7701\u7565\u8be6\u7ec6\u7684\u8bf4\u660e\uff0c\u5c06\u4ecb\u7ecd\u611f\u5174\u8da3\u7684\u4eba\u7684\u89d2\u8272\u59d4\u6258\u7ed9\u5b98\u65b9\u7f51\u7ad9\u6216\u7ef4\u57fa\u767e\u79d1\u3002<\/p>\n

 <\/p>\n

\u901a\u8fc7\u5bf9\u8c61\u6620\u5c04\u6765\u8fdb\u884c\u6570\u636e\u5e93\u7f16\u7a0b<\/h1>\n

\u6570\u636e\u5e93\u548c\u5bf9\u8c61\u6620\u5c04<\/h3>\n

\u5728\u6570\u636e\u5e93\u4e2d\u7ba1\u7406\u7684\u6570\u636e\uff08\u8bb0\u5f55\uff09\u548c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u4f7f\u7528\u7684\u6570\u636e\uff08\u5bf9\u8c61\uff09\u4e4b\u95f4\u7684\u8f6c\u6362\u901a\u5e38\u9700\u8981\u638c\u63e1\u4e13\u7528\u5e93\uff0c\u5c24\u5176\u662f\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\u3002\u8fd9\u6837\u7684\u529f\u80fd\u88ab\u79f0\u4e3a\u5bf9\u8c61\uff08\u5173\u7cfb\uff09\u6620\u5c04\u3002<\/p>\n

Cassandra\u4e0e\u5bf9\u8c61\u6620\u5c04<\/h3>\n

\u5728Cassandra\u4e2d\uff0c\u5bf9\u8c61\u6620\u5c04\u529f\u80fd\u7531cassandra.cqlengine\u5305\u63d0\u4f9b\u3002<\/p>\n

\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5229\u7528\u8be5\u7a0b\u5e8f\u5305\u63d0\u4f9b\u7684\u5bf9\u8c61\u6620\u5c04\u529f\u80fd\u8fdb\u884c\u7f16\u7a0b\u7684\u6982\u8981\u3002<\/p>\n

 <\/p>\n

\u5173\u4e8e\u5904\u7406Cassandra\u6570\u636e\u6a21\u578b\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u8003\u4e0a\u8ff0\u6587\u6863\u3002\u7136\u800c\uff0cCassandra\u4f7f\u7528CQL\uff08Cassandra Query Language\uff09\u534f\u8bae\u8fdb\u884c\u672c\u5730\u8bbf\u95ee\uff0c\u5982\u679c\u4f60\u6709\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7ecf\u9a8c\uff0c\u4f60\u5e94\u8be5\u53ef\u4ee5\u51e0\u4e4e\u5b8c\u5168\u7406\u89e3\u4e0b\u9762\u7684\u4ee3\u7801\uff08\u5982\u679c\u51fa\u73b0\u4e0d\u719f\u6089\u7684\u672f\u8bed\u5982”\u805a\u7c7b\u952e”\uff0c\u8bf7\u9002\u65f6\u67e5\u9605\u76f8\u5173\u6587\u6863\u3002\u4e0d\u8fc7\uff0c\u5e94\u8be5\u6ca1\u6709\u95ee\u9898\u6765\u638c\u63e1\u6574\u4f53\u7684\u6982\u5ff5\uff09\u3002<\/p>\n

\u793a\u4f8b\u7a0b\u5e8f<\/h2>\n

\u9996\u5148\uff0c\u6211\u4eec\u5c06\u5c55\u793a\u793a\u4f8b\u7a0b\u5e8f\u7684\u6574\u4f53\u7ed3\u6784\u3002<\/p>\n

import<\/span> uuid<\/span>\r\nfrom<\/span> cassandra.cqlengine<\/span> import<\/span> columns<\/span>\r\nfrom<\/span> cassandra.cqlengine<\/span> import<\/span> connection<\/span>\r\nfrom<\/span> datetime<\/span> import<\/span> datetime<\/span>\r\nfrom<\/span> cassandra.cqlengine.management<\/span> import<\/span> sync_table<\/span>\r\nfrom<\/span> cassandra.cqlengine.models<\/span> import<\/span> Model<\/span>\r\n\r\n# \u307e\u305a\u3001\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\r\n<\/span>class<\/span> ExampleModel<\/span>(<\/span>Model<\/span>):<\/span>\r\n    example_id<\/span>      =<\/span> columns<\/span>.<\/span>UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>,<\/span> default<\/span>=<\/span>uuid<\/span>.<\/span>uuid4<\/span>)<\/span>\r\n    example_type<\/span>    =<\/span> columns<\/span>.<\/span>Integer<\/span>(<\/span>index<\/span>=<\/span>True<\/span>)<\/span>\r\n    created_at<\/span>      =<\/span> columns<\/span>.<\/span>DateTime<\/span>()<\/span>\r\n    description<\/span>     =<\/span> columns<\/span>.<\/span>Text<\/span>(<\/span>required<\/span>=<\/span>False<\/span>)<\/span>\r\n\r\n# \u6b21\u306bCassandra\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u63a5\u7d9a\u3092\u884c\u3044\u307e\u3059\u3002\r\n# \u5229\u7528\u3067\u304d\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u3092\u53c2\u7167\uff1a http:\/\/datastax.github.io\/python-driver\/api\/cassandra\/cluster.html\r\n# \u914d\u5217\u3068\u3057\u3066\u3001\u63a5\u7d9a\u5148\u30db\u30b9\u30c8\u306e\u30ea\u30b9\u30c8\u3092Cluster\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u4f5c\u6210\u6642\u306b\u6e21\u3057\u307e\u3059\uff08\u3053\u3053\u3067\u306f\u958b\u767a\u74b0\u5883\u3092\u60f3\u5b9a\u3057\u3001\u30ed\u30fc\u30ab\u30eb\u30db\u30b9\u30c8\u4e00\u3064\u3092\u5229\u7528\uff09\u3002\r\n<\/span>connection<\/span>.<\/span>setup<\/span>([<\/span>'<\/span>127.0.0.1<\/span>'<\/span>],<\/span> \"<\/span>cqlengine<\/span>\"<\/span>,<\/span> protocol_version<\/span>=<\/span>3<\/span>)<\/span>\r\n\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u5728Python\u547d\u4ee4\u884c\u754c\u9762\u4e0a\u6267\u884c\u5e76\u8f93\u51fa\u7ed3\u679c\u7684\u793a\u4f8b\u56fe\u50cf\u3002<\/p>\n
# \u4ee5\u4e0b\u306e\u64cd\u4f5c\u306b\u3088\u308a\u3001\u5b9a\u7fa9\u3057\u305f\u30e2\u30c7\u30eb\u306e\u30c6\u30fc\u30d6\u30eb\u304cCassandra\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\r\n<\/span>>>><\/span> sync_table<\/span>(<\/span>ExampleModel<\/span>)<\/span>\r\n\r\n#\u3000\u3053\u308c\u3067\u30c6\u30fc\u30d6\u30eb\u306b\u30ec\u30b3\u30fc\u30c9\uff08\u5217\uff09\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\r\n<\/span>>>><\/span> em1<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>0<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example1<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em2<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>0<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example2<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em3<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>0<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example3<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em4<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>0<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example4<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em5<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>1<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example5<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em6<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>1<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example6<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em7<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>1<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example7<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n>>><\/span> em8<\/span> =<\/span> ExampleModel<\/span>.<\/span>create<\/span>(<\/span>example_type<\/span>=<\/span>1<\/span>,<\/span> description<\/span>=<\/span>\"<\/span>example8<\/span>\"<\/span>,<\/span> created_at<\/span>=<\/span>datetime<\/span>.<\/span>now<\/span>())<\/span>\r\n\r\n# \u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3066\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\r\n<\/span>>>><\/span> ExampleModel<\/span>.<\/span>objects<\/span>.<\/span>count<\/span>()<\/span>\r\n8<\/span>\r\n>>><\/span> q<\/span> =<\/span> ExampleModel<\/span>.<\/span>objects<\/span>(<\/span>example_type<\/span>=<\/span>1<\/span>)<\/span>\r\n>>><\/span> q<\/span>.<\/span>count<\/span>()<\/span>\r\n4<\/span>\r\n>>><\/span> for<\/span> instance<\/span> in<\/span> q<\/span>:<\/span>\r\n>>><\/span>     print<\/span> instance<\/span>.<\/span>description<\/span>\r\nexample5<\/span>\r\nexample6<\/span>\r\nexample7<\/span>\r\nexample8<\/span>\r\n\r\n# \u3053\u3053\u3067\u306f\u3001\u8ffd\u52a0\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u9069\u7528\u3057\u307e\u3059\u3002\r\n# query\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u3053\u3053\u3067\u623b\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8(q2)\u306f\u3001\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\r\n<\/span>>>><\/span> q2<\/span> =<\/span> q<\/span>.<\/span>filter<\/span>(<\/span>example_id<\/span>=<\/span>em5<\/span>.<\/span>example_id<\/span>)<\/span>\r\n\r\n>>><\/span> q2<\/span>.<\/span>count<\/span>()<\/span>\r\n1<\/span>\r\n>>><\/span> for<\/span> instance<\/span> in<\/span> q2<\/span>:<\/span>\r\n>>><\/span>     print<\/span> instance<\/span>.<\/span>description<\/span>\r\nexample5<\/span>\r\n<\/code><\/pre>\n
\u6a21\u578b\u6982\u8981<\/h2>\n
\u6a21\u578b\u662f\u8868\u793aCQL\u8868\u683c\u7684Python\u7c7b\u3002\u6a21\u578b\u662f\u4eceModel\u6d3e\u751f\u51fa\u6765\u7684\uff0c\u5e76\u5b9a\u4e49\u4e86\u57fa\u672c\u8868\u683c\u5c5e\u6027\u548c\u8868\u683c\u5217\u3002<\/p>\n
\u6a21\u578b\u7684\u5217\u4f1a\u6620\u5c04\u5230CQL\u8868\u7684\u5217\u4e0a\u3002\u901a\u8fc7\u5728\u6a21\u578b\u7c7b\u4e2d\u5b9a\u4e49\u5217\u7684\u5c5e\u6027\uff0c\u53ef\u4ee5\u5b9a\u4e49CQL\u5217\u3002\u4e3a\u4e86\u4f7f\u6a21\u578b\u6709\u6548\uff0c\u81f3\u5c11\u9700\u8981\u4e00\u4e2a\u4e3b\u952e\u5217\u548c\u4e00\u4e2a\u975e\u4e3b\u952e\u5217\u3002\u4e0eCQL\u7c7b\u4f3c\uff0c\u5b9a\u4e49\u5217\u7684\u987a\u5e8f\u4e5f\u5f88\u91cd\u8981\u3002\u8fd9\u4e0e\u5728\u5bf9\u5e94\u7684\u8868\u4e2d\u5b9a\u4e49\u5217\u7684\u987a\u5e8f\u76f8\u540c\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u5b9a\u4e49\u6a21\u578b\u7684\u57fa\u672c\u793a\u4f8b\u3002\u6709\u5173\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u6587\u6863\u3002<\/p>\n
\u6865\u672c\u662f\u6a21\u7279\u7684\u5178\u8303\u3002<\/h2>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7ee7\u627f\u81eaModel\u7c7b\u5e76\u5177\u6709\u5217first_name\u548clast_name\u7684Person\u7c7b\u3002<\/p>\n
from<\/span> cassandra.cqlengine<\/span> import<\/span> columns<\/span>\r\nfrom<\/span> cassandra.cqlengine.models<\/span> import<\/span> Model<\/span>\r\n\r\n class<\/span> Person<\/span>(<\/span>Model<\/span>):<\/span>\r\n     id<\/span> =<\/span> columns<\/span>.<\/span>UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n     first_name<\/span>  =<\/span> columns<\/span>.<\/span>Text<\/span>()<\/span>\r\n     last_name<\/span> =<\/span> columns<\/span>.<\/span>Text<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u6b64”Person”\u7c7b\u5bf9\u5e94\u4ee5\u4e0bCQL\u8868\u3002\u53ef\u4ee5\u4f7f\u7528”create table”\u8bed\u53e5\u6765\u8868\u793a\u3002<\/p>\n
CREATE<\/span> TABLE<\/span> cqlengine<\/span>.<\/span>person<\/span> (<\/span>\r\n    id<\/span> uuid<\/span>,<\/span>\r\n    first_name<\/span> text<\/span>,<\/span>\r\n    last_name<\/span> text<\/span>,<\/span>\r\n    PRIMARY<\/span> KEY<\/span> (<\/span>id<\/span>)<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u53e6\u4e00\u79cd\u6a21\u578b\u5b9a\u4e49\u65b9\u6cd5\u7684\u4f8b\u5b50\uff0c\u5373Comment\u7c7b\u3002<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u4f5c\u4e3a\u4e00\u4e2a\u65b0\u7684\u8981\u7d20\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528clustering_order=”DESC”\u8fd9\u4e2a\u964d\u5e8f(DESC)\u7684\u805a\u7c7b\u952e\u3002<\/p>\n
from<\/span> cassandra.cqlengine<\/span> import<\/span> columns<\/span>\r\nfrom<\/span> cassandra.cqlengine.models<\/span> import<\/span> Model<\/span>\r\n\r\nclass<\/span> Comment<\/span>(<\/span>Model<\/span>):<\/span>\r\n    photo_id<\/span> =<\/span> columns<\/span>.<\/span>UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n    comment_id<\/span> =<\/span> columns<\/span>.<\/span>TimeUUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>,<\/span> clustering_order<\/span>=<\/span>\"<\/span>DESC<\/span>\"<\/span>)<\/span>\r\n    comment<\/span> =<\/span> columns<\/span>.<\/span>Text<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8ff0\u7684 Comment \u6a21\u578b\u5bf9\u5e94\u7684\u8868\u683c\u5982\u4e0b\u6240\u793a\u3002\u901a\u8fc7 create table \u8bed\u53e5\u521b\u5efa\u3002<\/p>\n
CREATE<\/span> TABLE<\/span> comment<\/span> (<\/span>\r\n  photo_id<\/span> uuid<\/span>,<\/span>\r\n  comment_id<\/span> timeuuid<\/span>,<\/span>\r\n  comment<\/span> text<\/span>,<\/span>\r\n  PRIMARY<\/span> KEY<\/span> (<\/span>photo_id<\/span>,<\/span> comment_id<\/span>)<\/span>\r\n)<\/span> WITH<\/span> CLUSTERING<\/span> ORDER<\/span> BY<\/span> (<\/span>comment_id<\/span> DESC<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u540c\u6b65\u8fd9\u4e9b\u6a21\u578b\u5230\u6570\u636e\u5e93\uff0c\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\u3002\uff08\u6ce8\u610f\uff0c\u5728\u6b64\u5904\uff0cPerson\u548cComment\u4e0d\u662f\u5bf9\u8c61\uff0c\u800c\u662f\u7c7b\uff09<\/p>\n
from<\/span> cassandra.cqlengine.management<\/span> import<\/span> sync_table<\/span>\r\nsync_table<\/span>(<\/span>Person<\/span>)<\/span>\r\nsync_table<\/span>(<\/span>Comment<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u6a21\u578b\u540c\u6b65\u9700\u8981\u8fdb\u884c\u6a21\u5f0f\u66f4\u6539\u3002\u5fc5\u987b\u8003\u8651\u5bf9\u6570\u636e\u5e93\u7684\u5f71\u54cd\u5e76\u8fdb\u884c\u64cd\u4f5c\u3002\u6709\u5173\u6ce8\u610f\u4e8b\u9879\uff0c\u8bf7\u53c2\u9605\u6587\u6863\u4e2d\u7684\u6a21\u5f0f\u7ba1\u7406\u8bf4\u660e\u3002<\/p>\n
\u6a21\u578b\u64cd\u4f5c<\/h2>\n
\u6a21\u578b\u5b9e\u4f8b\u53ef\u4ee5\u901a\u8fc7\u7c7b\u4f3c\u5b57\u5178\u64cd\u4f5c\u7684\u65b9\u5f0f\u8fdb\u884c\u8bbf\u95ee\uff0c\u5177\u4f53\u5982\u4e0b\u3002<\/p>\n
class<\/span> Person<\/span>(<\/span>Model<\/span>):<\/span>\r\n    first_name<\/span>  =<\/span> columns<\/span>.<\/span>Text<\/span>()<\/span>\r\n    last_name<\/span> =<\/span> columns<\/span>.<\/span>Text<\/span>()<\/span>\r\n\r\nkevin<\/span> =<\/span> Person<\/span>.<\/span>create<\/span>(<\/span>first_name<\/span>=<\/span>\"<\/span>Kevin<\/span>\"<\/span>,<\/span> last_name<\/span>=<\/span>\"<\/span>Deldycke<\/span>\"<\/span>)<\/span>\r\ndict<\/span>(<\/span>kevin<\/span>)<\/span>  # returns {'first_name': 'Kevin', 'last_name': 'Deldycke'}\r\n<\/span>kevin<\/span>[<\/span>'<\/span>first_name<\/span>'<\/span>]<\/span>  # returns 'Kevin'\r\n<\/span>kevin<\/span>.<\/span>keys<\/span>()<\/span>  # returns ['first_name', 'last_name']\r\n<\/span>kevin<\/span>.<\/span>values<\/span>()<\/span>  # returns ['Kevin', 'Deldycke']\r\n<\/span>kevin<\/span>.<\/span>items<\/span>()<\/span>  # returns [('first_name', 'Kevin'), ('last_name', 'Deldycke')]\r\n<\/span>\r\nkevin<\/span>[<\/span>'<\/span>first_name<\/span>'<\/span>]<\/span> =<\/span> '<\/span>KEVIN5000<\/span>'<\/span>  # changes the models first name\r\n<\/span><\/code><\/pre>\n
\u6a21\u578b\u9a8c\u8bc1\u7684\u6269\u5c55<\/h2>\n
\u6bcf\u6b21\u5c06\u6a21\u578b\u5b9e\u4f8b\u4fdd\u5b58\u5230cqlengine\u4e2d\u65f6\uff0c\u6a21\u578b\u5185\u7684\u6570\u636e\u5c06\u6839\u636e\u4e3a\u6a21\u578b\u5b9a\u4e49\u7684\u67b6\u6784\u8fdb\u884c\u9a8c\u8bc1\u3002\u8fd9\u79cd\u9a8c\u8bc1\u901a\u5e38\u662f\u663e\u800c\u6613\u89c1\u7684\u3002\u4f8b\u5982\uff0c\u5b83\u4f1a\u786e\u4fdd\u4e0d\u4f1a\u6df7\u6dc6\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0d\u4f1a\u5c06\u6587\u672c\u4fdd\u5b58\u4e3a\u6574\u6570\u5217\u3002\u6b64\u5916\uff0c\u5b83\u8fd8\u4f1a\u6267\u884c\u5fc5\u8981\u7684\u8f6c\u6362\u4ee5\u6b63\u786e\u4fdd\u5b58\u6570\u636e\u3002<\/p>\n
\u7136\u800c\uff0c\u9664\u4e86\u786e\u4fdd\u5728\u5c1d\u8bd5\u63d2\u5165\u6570\u636e\u65f6\u4e0d\u4f1a\u5728Cassandra\u6570\u636e\u5e93\u4e2d\u51fa\u73b0\u9519\u8bef\u4e4b\u5916\uff0c\u8fd8\u53ef\u80fd\u5e0c\u671b\u6dfb\u52a0\u989d\u5916\u7684\u7ea6\u675f\u548c\u8f6c\u6362\u3002\u8981\u5b9a\u4e49\u989d\u5916\u7684\u9a8c\u8bc1\u903b\u8f91\u4ee5\u9a8c\u8bc1\u6a21\u578b\uff0c\u9700\u8981\u6269\u5c55\u8be5\u6a21\u578b\u7684validate\u65b9\u6cd5\u3002<\/p>\n
class<\/span> Member<\/span>(<\/span>Model<\/span>):<\/span>\r\n    person_id<\/span> =<\/span> UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n    name<\/span> =<\/span> Text<\/span>(<\/span>required<\/span>=<\/span>True<\/span>)<\/span>\r\n\r\n    def<\/span> validate<\/span>(<\/span>self<\/span>):<\/span>\r\n        super<\/span>(<\/span>Member<\/span>,<\/span> self<\/span>).<\/span>validate<\/span>()<\/span>\r\n        if<\/span> self<\/span>.<\/span>name<\/span> ==<\/span> '<\/span>jon<\/span>'<\/span>:<\/span>\r\n            raise<\/span> ValidationError<\/span>(<\/span>'<\/span>no jon<\/span>\\'<\/span>s allowed<\/span>'<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u9a8c\u8bc1\u5931\u8d25\uff0c\u53ef\u4ee5\u5f15\u53d1(cassandra.cqlengine.) ValidationError\u3002\u7136\u800c\uff0c\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u4e5f\u53ef\u4ee5\u8003\u8651\u5c06\u5176\u8f6c\u6362\u4e3a\u5931\u8d25\u9a8c\u8bc1\u7684\u9ed8\u8ba4\u503c\u7b49\u5176\u4ed6\u5904\u7406\u65b9\u6cd5\u3002<\/p>\n
\u6a21\u578b\u7684\u7ee7\u627f<\/h2>\n
\u4f7f\u7528\u5355\u4e2aCQL\u8868\u683c\uff0c\u60a8\u53ef\u4ee5\u4fdd\u5b58\u548c\u52a0\u8f7d\u4e0d\u540c\u7684\u6a21\u578b\u7c7b\u3002\u8fd9\u5bf9\u4e8e\u5e0c\u671b\u5c06\u4e0d\u540c\u5bf9\u8c61\u7c7b\u578b\u5b58\u50a8\u5728\u5355\u4e2aCassandra\u884c\u4e2d\u7684\u60c5\u51b5\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u5047\u8bbe\u6709\u4e00\u4e2a\u5b58\u50a8\u732b\u548c\u72d7\u76f8\u5173\u4fe1\u606f\u7684\u5ba0\u7269\u8868\u683c\u3002<\/p>\n
class<\/span> Pet<\/span>(<\/span>Model<\/span>):<\/span>\r\n    __table_name__<\/span> =<\/span> '<\/span>pet<\/span>'<\/span>\r\n    owner_id<\/span> =<\/span> UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n    pet_id<\/span> =<\/span> UUID<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n    pet_type<\/span> =<\/span> Text<\/span>(<\/span>discriminator_column<\/span>=<\/span>True<\/span>)<\/span>\r\n    name<\/span> =<\/span> Text<\/span>()<\/span>\r\n\r\n    def<\/span> eat<\/span>(<\/span>self<\/span>,<\/span> food<\/span>):<\/span>\r\n        pass<\/span>\r\n\r\n    def<\/span> sleep<\/span>(<\/span>self<\/span>,<\/span> time<\/span>):<\/span>\r\n        pass<\/span>\r\n\r\nclass<\/span> Cat<\/span>(<\/span>Pet<\/span>):<\/span>\r\n    __discriminator_value__<\/span> =<\/span> '<\/span>cat<\/span>'<\/span>\r\n    cuteness<\/span> =<\/span> Float<\/span>()<\/span>\r\n\r\n    def<\/span> tear_up_couch<\/span>(<\/span>self<\/span>):<\/span>\r\n        pass<\/span>\r\n\r\nclass<\/span> Dog<\/span>(<\/span>Pet<\/span>):<\/span>\r\n    __discriminator_value__<\/span> =<\/span> '<\/span>dog<\/span>'<\/span>\r\n    fierceness<\/span> =<\/span> Float<\/span>()<\/span>\r\n\r\n    def<\/span> bark_all_night<\/span>(<\/span>self<\/span>):<\/span>\r\n        pass<\/span>\r\n<\/code><\/pre>\n
\u5728\u8c03\u7528sync_table\u4e4b\u540e\uff0c\u6bcf\u4e2a\u6a21\u578b\u5b9a\u4e49\u7684\u5217\u5c06\u88ab\u6dfb\u52a0\u5230pet\u8868\u4e2d\u3002\u6b64\u5916\uff0c\u4fdd\u5b58\u6a21\u578b\u7684Cat\u548cDog\u884c\u6240\u9700\u7684\u5143\u6570\u636e\u5c06\u88ab\u4fdd\u5b58\uff0c\u4ee5\u4fbf\u8bc6\u522b\u5b83\u4eec\u662f\u732b\u8fd8\u662f\u72d7\u3002<\/p>\n
\u8981\u4f7f\u7528\u7ee7\u627f\u6765\u8bbe\u7f6e\u6a21\u578b\u7ed3\u6784\uff0c\u8bf7\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
    \n
  • \n
      \u8b58\u5225\u5b50\uff08\u3053\u3053\u3067\u306fpet_type\uff09\u3068\u3057\u3066\u8a2d\u5b9a\u3055\u308c\u305f\u5217\u3092\u6301\u3064\u57fa\u672c\u30e2\u30c7\u30eb\u3092\u4f5c\u6210\u3059\u308b(distriminator_column=True\u306b\u3088\u308a\u6307\u5b9a)\u3002<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u30b5\u30d6\u30af\u30e9\u30b9 \u30e2\u30c7\u30eb\u3092\uff08\u8907\u6570\uff09\u5b9a\u7fa9\u3057\u3001__discriminator_value__\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\uff08\u305d\u308c\u305e\u308c\uff09\u4e00\u610f\u306e\u5024\u3092\u5b9a\u7fa9\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
          sync_table\u3092\u5404\u30b5\u30d6\u30c6\u30fc\u30d6\u30eb\u3067\u5b9f\u884c\u3059\u308b<\/p>\n
          \u81ea\u5b9a\u4e49\u7c7b\u578b<\/h2>\n
          cqlengine\u53ef\u4ee5\u5bf9\u7528\u6237\u5b9a\u4e49\u7c7b\u578b\uff08UDT\uff1aUser Defined Type\uff09\u8fdb\u884c\u5efa\u6a21\u3002
          \nUDT\u53ef\u4ee5\u4f5c\u4e3a\u6a21\u578b\uff08\u8868\uff09\u7684\u5b57\u6bb5\u88ab\u4f7f\u7528\uff0c\u800c\u4e0d\u662f\u5355\u72ec\u4f7f\u7528\u3002
          \nUDT\u5b9e\u4f8b\u901a\u8fc7\u5bf9\u5e94\u4e8e\u8868\u7684\u6a21\u578b\u8fdb\u884c\u521b\u5efa\u3001\u4fdd\u5b58\u548c\u67e5\u8be2\u3002<\/p>\n
          from<\/span> cassandra.cqlengine.columns<\/span> import<\/span> *<\/span>\r\nfrom<\/span> cassandra.cqlengine.models<\/span> import<\/span> Model<\/span>\r\nfrom<\/span> cassandra.cqlengine.usertype<\/span> import<\/span> UserType<\/span>\r\n\r\nclass<\/span> address<\/span>(<\/span>UserType<\/span>):<\/span>\r\n    street<\/span> =<\/span> Text<\/span>()<\/span>\r\n    zipcode<\/span> =<\/span> Integer<\/span>()<\/span>\r\n\r\nclass<\/span> users<\/span>(<\/span>Model<\/span>):<\/span>\r\n    __keyspace__<\/span> =<\/span> '<\/span>account<\/span>'<\/span>\r\n    name<\/span> =<\/span> Text<\/span>(<\/span>primary_key<\/span>=<\/span>True<\/span>)<\/span>\r\n    addr<\/span> =<\/span> UserDefinedType<\/span>(<\/span>address<\/span>)<\/span>\r\n\r\nusers<\/span>.<\/span>create<\/span>(<\/span>name<\/span>=<\/span>\"<\/span>Joe<\/span>\"<\/span>,<\/span> addr<\/span>=<\/span>address<\/span>(<\/span>street<\/span>=<\/span>\"<\/span>Easy St.<\/span>\"<\/span>,<\/span> zipcode<\/span>=<\/span>99999<\/span>))<\/span>\r\nuser<\/span> =<\/span> users<\/span>.<\/span>objects<\/span>(<\/span>name<\/span>=<\/span>\"<\/span>Joe<\/span>\"<\/span>)[<\/span>0<\/span>]<\/span>\r\nprint<\/span> user<\/span>.<\/span>name<\/span>,<\/span> user<\/span>.<\/span>addr<\/span>\r\n# Joe address(street=u'Easy St.', zipcode=99999)\r\n<\/span><\/code><\/pre>\n
          UDT\u88ab\u5b9a\u4e49\u4e3a\u7ee7\u627fUserType\u7684\u7c7b\uff0c\u5e76\u901a\u8fc7\u4e3a\u5176\u5c5e\u6027\u5b57\u6bb5\u8bbe\u7f6e\u76f8\u5e94\u6570\u636e\u7c7b\u578b\u7684\u5b9e\u4f8b\u6765\u8fdb\u884c\u5efa\u6a21\u3002
          \n\u7136\u540e\uff0c\u901a\u8fc7\u5c06UDT\u7c7b\u58f0\u660e\u4e3aUserDefinedType\u7c7b\u7684\u53c2\u6570\uff0c\u53ef\u4ee5\u5728\u6a21\u578b\u7684\uff08\u5b57\u6bb5\/\u884c\uff09\u5b9a\u4e49\u4e2d\u4f7f\u7528UDT\u3002<\/p>\n
          “Sync_table\u5c06\u9690\u5f0f\u540c\u6b65\u5305\u542b\u5728\u8868\u4e2d\u7684\u6240\u6709UDT\u3002\u6216\u8005\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528sync_type()\u6765\u663e\u5f0f\u5730\u521b\u5efa\/\u4fee\u6539UDT\u3002”<\/p>\n
          \u58f0\u660e\u540e\uff0c\u7c7b\u578b\u5c06\u81ea\u52a8\u6ce8\u518c\u7ed9\u9a71\u52a8\u7a0b\u5e8f\uff0c\u56e0\u6b64\u67e5\u8be2\u7ed3\u679c\u5c06\u8fd4\u56deUserType\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n
          \u6700\u7ec8<\/h1>\n
          \u672c\u6b21\u4ecb\u7ecd\u4e86\u5728\u4f7f\u7528Python\u8fdb\u884cCassandra\u7f16\u7a0b\u65f6\uff0c\u5bf9\u8c61\u6620\u5c04\u7684\u5de5\u4f5c\u539f\u7406\u3002\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u4f7f\u7528\u5bf9\u8c61\u6620\u5c04\uff0c\u800c\u662f\u4f7f\u7528CQL\u67e5\u8be2\u6765\u8fdb\u884c\u7f16\u7a0b\u3002\u5728\u9879\u76ee\u4e2d\u4f7f\u7528Cassandra\u65f6\uff0c\u4ecb\u7ecd\u4e86\u5bf9\u8c61\u6620\u5c04\u4f5c\u4e3a\u4e00\u79cd\u53ef\u9009\u7684\u9009\u62e9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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