{"id":1270,"date":"2017-05-25T21:30:31","date_gmt":"2017-05-25T13:30:31","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=1270"},"modified":"2018-12-17T20:20:35","modified_gmt":"2018-12-17T12:20:35","slug":"%e4%bb%8ephp%e5%ae%a2%e6%88%b7%e7%ab%af%e7%9c%8bmongodb%e9%80%9a%e4%bf%a1%e5%8d%8f%e8%ae%ae","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=1270","title":{"rendered":"\u4ecePHP\u5ba2\u6237\u7aef\u770bMongoDB\u901a\u4fe1\u534f\u8bae"},"content":{"rendered":"

MongoDB<\/a><\/span> \u7684 PHP \u5ba2\u6237\u7aef\u6709\u4e00\u4e2a MongoCursor<\/a><\/span> \u7c7b\uff0c\u5b83\u662f\u7528\u4e8e\u83b7\u53d6\u4e00\u6b21\u67e5\u8be2\u7ed3\u679c\u96c6\u7684\u53e5\u67c4\uff08\u6216\u8005\u53eb\u6e38\u6807\uff09\uff0c\u8fd9\u4e2a\u7b80\u5355\u7684\u53d6\u6570\u636e\u64cd\u4f5c\uff0c\u5185\u90e8\u5b9e\u73b0\u5176\u5b9e\u4e0d\u662f\u90a3\u4e48\u7b80\u5355\u3002\u672c\u6587\u5c31\u901a\u8fc7\u5bf9 MongoCursor \u7c7b\u4e00\u4e9b\u64cd\u4f5c\u8fdb\u884c\u5206\u6790\uff0c\u5411\u5927\u5bb6\u63ed\u5f00 MongoDB \u5ba2\u6237\u7aef\u670d\u52a1\u5668\u901a\u4fe1\u7684\u4e00\u4e9b\u5185\u90e8\u7ec6\u8282\u3002<\/p>\n

getNext\u4e0e\u7f51\u7edc\u8bf7\u6c42<\/h3>\n

\u901a\u5e38\u6765\u8bf4\uff0c\u6bcf\u4e00\u6b21find\u64cd\u4f5c\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2aMongoCursor\u5bf9\u8c61\uff0c\u5728\u8fd9\u4e2a\u5bf9\u8c61\u4e0a\u8c03\u7528getNext\u65b9\u6cd5\uff0c\u5c31\u80fd\u591f\u83b7\u5f97\u4e00\u6761\u7ed3\u679c\u6570\u636e\u3002\u5faa\u73af\u8c03\u7528getNext\u65b9\u6cd5\u5c31\u80fd\u83b7\u53d6\u591a\u6761\u6570\u636e\u3002\u4e0b\u9762\u6211\u4eec\u5c31\u6765\u770b\u770b\u5176\u5185\u90e8\u53d6\u6570\u636e\u7684\u5177\u4f53\u903b\u8f91\u3002<\/p>\n

\u9996\u5148\u6211\u4eec\u7528\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u6765\u751f\u6210\u4e00\u4e2aMongoCursor\u5bf9\u8c61\uff1a<\/p>\n

$m = new Mongo();\n$collection = $m->demoDb->demoCollection;\n$cursor = $collection->find();<\/code><\/pre>\n
\u5f53\u6211\u4eec\u8c03\u7528 find \u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a MongoCursor \u5bf9\u8c61\uff0c\u800c\u8fd9\u65f6\u5019\u53ea\u662f\u751f\u6210\u4e00\u4e2a\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u800c\u5df2\uff0c\u5e76\u4e0d\u4f1a\u628a\u6211\u4eec\u7684 find \u67e5\u8be2\u53d1\u9001\u5230\u670d\u52a1\u7aef\uff0c\u56e0\u4e3a\u5728\u751f\u6210 MongoCursor \u5bf9\u8c61\u540e\uff0c\u6211\u4eec\u8fd8\u53ef\u80fd\u5bf9\u5b83\u505a\u4e00\u4e9b\u5176\u5b83\u64cd\u4f5c\uff0c\u6bd4\u5982 sort\uff0climit \u7b49\u7b49\u3002\u8fd9\u5c31\u5bf9\u67e5\u8be2\u6761\u4ef6\u8fdb\u884c\u4e86\u6539\u53d8\u3002<\/p>\n
\u90a3\u4ec0\u4e48\u65f6\u5019 PHP \u4f1a\u5bf9 MongoDB \u53d1\u8d77 find \u7684\u7f51\u7edc\u8bf7\u6c42\u5462\uff0c\u662f\u5728 MongoCursor \u8c03\u7528 getNext \u65b9\u6cd5\u7684\u65f6\u5019\u3002\u6bd4\u5982\u6211\u4eec\u5728\u4e0a\u9762\u4ee3\u7801\u7684\u57fa\u7840\u4e0a\uff0c\u518d\u6267\u884c sort \u548c getNext \u4e24\u4e2a\u65b9\u6cd5\uff1a<\/p>\n
$cursor->sort( array( 'name' => 1 ) );\n$result = $cursor->getNext();<\/code><\/pre>\n
\u8fd9\u65f6\u5019\u7b2c\u4e8c\u884c\u4ee3\u7801\u5c31\u4f1a\u89e6\u53d1 find \u7684\u7f51\u7edc\u8bf7\u6c42\uff0c\u5177\u4f53\u8bf7\u6c42\u7684\u5185\u5bb9\u5982\u4e0b\u56fe\uff0c\u4e0b\u56fe\u662f\u5bf9\u8fd9\u6b21\u8bf7\u6c42\u7684\u4e8c\u8fdb\u5236\u534f\u8bae\u8fdb\u884c\u89e3\u6790\u540e\u7684\u6570\u636e\u7ed3\u6784\u5c55\u793a\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u4ece\u4e0a\u9762\u56fe\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cNumber to Return \u5b57\u6bb5\u662f0\uff0cMongoDB \u534f\u8bae\u91cc0\u8868\u793a\u4e0d\u505a\u9650\u5236\uff0c\u83b7\u53d6\u5168\u90e8\u6570\u636e\u3002\u6240\u4ee5\u8fd9\u4e00\u6b21\u7684 find \u64cd\u4f5c\u4f1a\u628a\u6240\u6709\u8fd9\u4e2a collection \u4e2d\u7684\u6240\u6709\u6570\u636e\u90fd\u62ff\u5230\u3002\u800c\u6211\u4eec\u8c03\u7528\u4e00\u6b21 getNext \u5b9e\u9645\u4e0a\u53ea\u62ff\u5230\u4e00\u6761\u6570\u636e\u3002\u90a3\u662f\u4e0d\u662f\u8bf4\u6211\u4eec\u6bcf\u8c03\u4e00\u6b21 getNext\uff0cPHP \u5c31\u4f1a\u8fdb\u884c\u4e00\u6b21\u7f51\u7edc\u8bf7\u6c42\u83b7\u53d6\u4e00\u6761\u6570\u636e\u5462\uff1f\u7ed3\u679c\u5f53\u7136\u662f\u5426\u5b9a\u7684\uff0c\u8fd9\u6837\u6548\u7387\u672a\u514d\u4e5f\u592a\u4f4e\u4e86\u3002\u90a3\u597d\uff0c\u90a3\u662f\u4e0d\u662f PHP \u5728\u7b2c\u4e00\u6b21\u8c03\u7528 getNext \u5c31\u628a\u6240\u6709\u6570\u636e\u62ff\u56de\u6765\uff0c\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u7136\u540e\u540e\u7eed\u7684 getNext \u8c03\u7528\u90fd\u5728\u672c\u5730\u5185\u5b58\u91cc\u53d6\u5c31\u884c\u4e86\u5462\uff1f\u7ed3\u679c\u8fd8\u662f\u5426\u5b9a\u7684\uff0c\u8fd9\u6837\u6570\u636e\u91cf\u5927\u70b9 PHP \u5c31\u5bb9\u6613\u88ab\u66b4\u83ca\u4e86\u5427\u3002<\/p>\n
\u6240\u4ee5\u4e8b\u5b9e\u4e0a\u662f\u600e\u4e48\u505a\u7684\u5462\uff1f\u6211\u4eec\u6765\u770b\u4e0b\u9762\u4e00\u5f20\u56fe\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u56fe\u4e0a\u7684 Number Returned \u7684\u503c\u662f101\uff0c\u4e5f\u5c31\u662f\u8bf4 MongoDB \u7ed9\u6211\u4eec\u8fd4\u56de\u4e86101\u6761\u6570\u636e\uff0c\u8fd9\u4e2a101\u5b9e\u9645\u4e0a\u5c31\u662f\u670d\u52a1\u5668\u9ed8\u8ba4\u7684 batchSize \u5927\u5c0f\u3002\u4e5f\u5c31\u662f\u8bf4\u5728\u6ca1\u6709\u6307\u5b9a\u8fd4\u56de\u591a\u5c11\u6761\u7684\u60c5\u51b5\u4e0b\uff0c\u4f1a\u9ed8\u8ba4\u8fd4\u56de101\u6761\u6570\u636e\u3002\u8fd9101\u6761\u6570\u636e\u4f1a\u5b58\u5728 PHP \u7684\u5185\u5b58\u4e2d\uff0c\u8fd9\u6837\u540e\u7eed\u7684100\u6b21 getNext \u8c03\u7528\uff0c\u90fd\u4e0d\u4f1a\u518d\u8fdb\u884c\u7f51\u7edc\u8bf7\u6c42\uff0c\u800c\u662f\u76f4\u63a5\u4ece\u5185\u5b58\u4e2d\u8fd4\u56de\u6570\u636e\u3002<\/p>\n
\u5982\u679c\u6211\u4eec\u5728\u4e0a\u9762\u7684 getNext \u540e\u518d\u8fdb\u884c\u4e0b\u9762\u7684\u8c03\u7528\u3002<\/p>\n
\/\/ skip the other 100 docs\nfor ($i = 0; $i < 100; $i++) { $cursor->getNext(); }\n\/\/ request document 102:\n$result = $cursor->getNext();<\/code><\/pre>\n
\u4e0a\u9762\u5148\u5faa\u73af\u8c03\u7528\u4e86100\u6b21 getNext\uff0c\u5185\u5b58\u4e2d\u7684101\u9879\u6570\u636e\u5c31\u90fd\u5df2\u7ecf\u88ab\u53d6\u5149\u4e86\uff0c\u7136\u540e\u5f53\u6211\u4eec\u518d\u6b21\u8c03\u7528 getNext \u53bb\u83b7\u53d6\u7b2c102\u6761\u6570\u636e\u7684\u65f6\u5019\uff0cPHP \u5185\u5b58\u4e2d\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\u53ef\u4ee5\u63d0\u4f9b\u4e86\uff0c\u8fd9\u65f6\u5019\u53c8\u4f1a\u518d\u53d1\u8d77\u4e00\u6b21\u5411 MongoDB \u670d\u52a1\u5668\u7684\u8bf7\u6c42\uff0c\u53bb\u83b7\u53d6\u66f4\u591a\u7684\u6570\u636e\u3002\u5ba2\u6237\u7aef\u8fd9\u6b21\u4f1a\u53d1\u8d77\u5982\u4e0b\u8bf7\u6c42\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u8fd9\u6b21\u6211\u4eec\u770b\u5230\uff0c\u8bf7\u6c42\u7684\u7801\u53d8\u6210\u4e86 Get More\u3002\u4e5f\u5c31\u662f\u5728\u4e0a\u6b21\u7684\u57fa\u7840\u4e0a\u83b7\u53d6\u66f4\u591a\u6570\u636e\u3002\u8fd9\u65f6\u5019\u5b9e\u9645 MongoDB \u4e0d\u4f1a\u518d\u6309\u4e00\u4e2a\u7279\u5b9a\u7684\u6761\u6570\u8fd4\u56de\u6570\u636e\uff0c\u800c\u662f\u6309\u4e00\u4e2a\u7279\u5b9a\u7684\u5927\u5c0f\uff0c\u76ee\u524d\u662f4M\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u4e00\u6b21\uff0cMongoDB \u4f1a\u8fd4\u56de\u6700\u591a4M\u7684\u6570\u636e\u3002\u5bf9\u4e0a\u9762\u7684\u8bf7\u6c42\uff0cMongoDB \u7684\u8fd4\u56de\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u8fd9\u6b21\u8fd4\u56de\u7ed3\u679c\u4e2d\uff0c\u6807\u8bc6\u4e86\u662f\u4ece\u7b2c101\u6761\u5f00\u59cb\uff0c\u5171\u8fd4\u56de\u4e8634673\u6761\u6570\u636e\u3002\u5927\u5c0f\u662f4194378\uff0c\u6b63\u597d\u662f4M\u3002<\/p>\n
\u8bbe\u7f6ebatchSize<\/h3>\n
\u4e0a\u9762\u6211\u4eec\u8bf4\u4e86\uff0cMongoDB \u9ed8\u8ba4\u7684 batchSize \u662f101\u6761\uff0c\u8fd9\u4e2a\u6761\u6570\u5b9e\u9645\u4e0a\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5ba2\u6237\u7aef\u6765\u8bbe\u5b9a\u7684\u3002\u5728 PHP \u4e2d\uff0c\u901a\u8fc7 batchSize \u51fd\u6570\u6765\u8fdb\u884c\u8bbe\u7f6e\u3002\u6bd4\u5982\u6211\u4eec\u7528\u4e0b\u9762\u547d\u4ee4\u8bbe\u5b9a batchSize \u4e3a25\uff1a<\/p>\n
$cursor = $collection->find()->sort( array( 'name' => 1 ) );\n$cursor->batchSize(25);\n$result = $cursor->getNext();<\/code><\/pre>\n
\u4e0a\u9762\u4ee3\u7801\u8c03\u7528\u4e86\u4e00\u6b21 getNext\uff0c\u6309\u4e0a\u9762\u8bb2\u5230\u7684\uff0c\u4f1a\u4e00\u6b21\u6027\u6279\u91cf\u53d6N\u6761\u6570\u636e\u56de\u5ba2\u6237\u7aef\u3002\u4e0a\u9762\u4ee3\u7801\u8fd0\u884c\u65f6\u4ea7\u751f\u7684\u7f51\u7edc\u8bf7\u6c42\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cNumber to Return\u88ab\u8bbe\u7f6e\u4e3a\u4e8625\u3002<\/p>\n
\u5982\u679c\u6211\u4eec\u518d\u5faa\u73af\u6267\u884cgetNext\u51fd\u657025\u6b21\uff0c\u52a0\u4e0a\u4e0a\u9762\u4ee3\u7801\u4e00\u5171\u6267\u884c26\u6b21\uff0c\u90a3\u4e48\u56e0\u4e3a\u7b2c\u4e00\u6b21\u53ea\u8fd4\u56de\u4e8625\u6761\u8bb0\u5f55\uff0c\u6240\u4ee5\u7b2c26\u6b21\u8c03\u7528getNext\u51fd\u6570\u65f6\u4f1a\u518d\u4e00\u6b21\u89e6\u53d1\u7f51\u7edc\u8bf7\u6c42\u3002\u8bf7\u6c42\u4f53\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u7531\u4e8e\u6211\u4eec\u8bbe\u5b9a\u4e86 batchSize \u4e3a25\uff0c\u6240\u4ee5\u8fd9\u4e00\u6b21\u8981\u6c42\u8fd4\u56de\u7684\u4e5f\u53ea\u670925\u6761\u3002\u670d\u52a1\u7aef\u8fd4\u56de\u7684\u6570\u636e\u4e5f\u5c31\u53ea\u670925\u6761\u3002<\/p>\n
\"\"<\/a><\/p>\n
\u4f7f\u7528limit<\/h3>\n
\u9664\u4e86 batchSize \u51fd\u6570\u4ee5\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u63a7\u5236\u6bcf\u6b21\u7f51\u7edc\u8bf7\u6c42\u6279\u91cf\u8fd4\u56de\u7684\u8bb0\u5f55\u6761\u6570\uff0c\u90a3\u5c31\u662f\u5728 MongoCursor \u4e0a\u8c03\u7528 limit \u51fd\u6570\uff0c\u76f4\u63a5\u8bbe\u7f6e\u9700\u8981\u83b7\u53d6\u7684\u8bb0\u5f55\u6761\u6570\u3002<\/p>\n
\u6bd4\u5982\u4e0b\u9762\u4ee3\u7801\uff0c\u6211\u4eec\u901a\u8fc7\u8bbe\u7f6e limit \u67e5\u8be2\u524d50000\u6761\u8bb0\u5f55\uff1a<\/p>\n
$cursor = $c->find()->sort( array( 'name' => 1 ) );\n$cursor->limit( 50000 );\n$res = $cursor->getNext();<\/code><\/pre>\n
\u4e0a\u9762\u4ee3\u7801\u4f1a\u53d1\u51fa\u4e0b\u9762\u7684\u8bf7\u6c42<\/p>\n
\"\"<\/a><\/p>\n
\u6211\u4eec\u770b\u5230\uff0c\u8981\u6c42\u8fd4\u56de\u7684\u6570\u76ee\u662f50000\u6761\uff0c\u90a3\u4e48MongoDB\u670d\u52a1\u5668\u662f\u4e0d\u662f\u5c31\u4e56\u4e56\u8fd4\u56de50000\u6761\u6570\u636e\u4e86\u5462\u3002\u8ba9\u6211\u4eec\u76f4\u63a5\u6765\u770b\u4e00\u4e0b\u5177\u4f53\u7684\u8fd4\u56de\u6570\u636e\u5305<\/p>\n
\"\"<\/a><\/p>\n
\u5f88\u9057\u61be\uff0cMongoDB \u670d\u52a1\u7aef\u53ea\u8fd4\u56de\u4e8634678\u6761\uff0c\u800c\u4e0d\u662f\u6211\u4eec\u7406\u60f3\u4e2d\u768450000\u6761\uff0c\u5176\u5b9e\u539f\u56e0\u4e5f\u5f88\u7b80\u5355\uff0c\u4ece Message Length \u7684\u503c\u5c31\u80fd\u770b\u51fa\u6765\uff0c\u56e0\u4e3a\u76ee\u524d\u8bf7\u6c42\u5305\u5df2\u7ecf\u8fbe\u52304M\u5927\u5c0f\u4e86\uff0c\u8fd9\u4e2a\u4e0a\u9650\u65e0\u6cd5\u903e\u8d8a\u3002\u6240\u4ee5\u53ea\u80fd\u8fd4\u56de34678\u6761\u6570\u636e\u4e86\u3002<\/p>\n
\u800c\u540c\u65f6\uff0c\u5ba2\u6237\u7aef\u5728\u6536\u5230\u8fd4\u56de\u7684\u6570\u636e\u5305\u65f6\uff0c\u53d1\u73b0\u53ea\u670934678\u6761\u6570\u636e\uff0c\u4e0d\u591f\u81ea\u5df1\u8981\u6c42\u768450000\u6761\uff0c\u8fd8\u5dee 50000 \u2013 34678 = 15322 \u6761\uff0c\u6240\u4ee5\u4f1a\u518d\u53d1\u8d77\u4e00\u6b21\u8bf7\u6c42\uff0c\u8981\u6c42\u670d\u52a1\u5668\u8fd4\u56de\u5269\u4f59\u768415322\u6761\u8bb0\u5f55\u3002\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/a><\/p>\n
batchSize \u548c limit \u76f8\u7ec4\u5408<\/h3>\n
\u6709\u65f6\u5019\u6211\u4eec\u53ef\u80fd\u4f1a\u9700\u8981\u53d6\u5f88\u591a\u6761\u6570\u636e\uff0c\u6bd4\u5982\u4e0a\u9762\u7684\uff0c\u901a\u8fc7\u8bbe\u7f6elimit\u4e3a50000\u6765\u83b7\u53d650000\u6761\u6570\u636e\uff0c\u800c\u53d6\u8fd950000\u6761\u6570\u636e\u7684\u83b7\u53d6\u53ef\u80fd\u4f1a\u8d85\u51fa\u6211\u4eec\u8bbe\u7f6e\u7684 MongoCursor \u7684 timeout \u9650\u5236\uff0c\u629b\u51fa Cursor \u8d85\u65f6\u7684\u5f02\u5e38\u3002\u8fd9\u65f6\u5019\u6211\u4eec\u53ef\u4ee5\u5728\u8bbe\u7f6e limit \u7684\u540c\u65f6\uff0c\u8bbe\u7f6e batchSize \u6765\u63a7\u5236\u6bcf\u4e24\u6b21\u8bf7\u6c42\u670d\u52a1\u5668\u7684\u65f6\u95f4\u95f4\u9694\u3002\u4ee5\u514d\u7531\u4e8e\u83b7\u53d6\u5927\u91cf\u6570\u636e\u5bfc\u81f4\u7684 MongoCursor \u8d85\u65f6\u3002<\/p>\n
\u6bd4\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\u91cc\uff0c\u6211\u4eec\u8981\u83b7\u53d6128\u6761\u6570\u636e\uff0c\u4f46\u662f\u901a\u8fc7\u8bbe\u7f6e batchSize \u6765\u63a7\u5236\u6bcf\u6b21\u53ea\u4ece\u670d\u52a1\u5668\u53d6\u56de50\u6761\u3002\u8fd9\u6837\u5728\u540e\u7eed\u7684 getNext \u8c03\u7528\u4e2d\uff0c\u5c31\u4f1a\u53d1\u751f\u4e09\u6b21\u7f51\u7edc\u8bf7\u6c42\uff0c\u5206\u522b\u8bf7\u6c42\u6570\u76ee\u662f50\u6761\uff0c50\u6761\uff0c28\u6761\u3002<\/p>\n
$cursor = $c->find()->sort( array( 'name' => 1 ) );\n$cursor->limit( 128 )->batchSize( 50 );\n$res = $cursor->getNext();\n\/\/ retrieve the other 127 documents that we still want\nfor ($i = 0; $i < 127; $i++) { $cursor->getNext(); }<\/code><\/pre>\n
\u5173\u4e8e batchSize \u51fd\u6570\u7684\u5c0f\u95ee\u9898<\/h3>\n
\u4e0a\u9762\u6211\u4eec\u8bf4\u4e86\u901a\u8fc7\u8bbe\u7f6e batchSiz e\u6765\u63a7\u5236\u5ba2\u6237\u7aef\u4e0e MongoDB \u670d\u52a1\u5668\u7684\u6570\u636e\u4ea4\u6362\u3002\u4f46\u662f\u8fd9\u91cc\u6709\u4e00\u4e2a\u7279\u4f8b\uff0c\u5f53 batchSize \u88ab\u8bbe\u7f6e\u4e3a1\uff0c\u6216\u8005\u662f\u8d1f\u6570\u65f6\uff0cMongoDB \u53ea\u4f1a\u8fd4\u56de\u7b2c\u4e00\u6b21\u8bf7\u6c42\u7684\u6570\u636e\u5305\uff0c\u7136\u540e\u76f4\u63a5\u5173\u95ed\u6389\u8fd9\u4e2a\u8fde\u63a5\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u6267\u884c\u4e0b\u9762\u7684\u547d\u4ee4\uff1a<\/p>\n
$cursor = $c->find()->sort( array( 'name' => 1 ) );\n$cursor->batchSize( 1 )->limit( 10 );\n$cursor->getNext();\nvar_dump( $cursor->getNext() );<\/code><\/pre>\n
\u4f1a\u53d1\u73b0\u6700\u540e\u4e00\u4e2a var_dump \u6253\u51fa\u6765\u7684\u603b\u662f NULL\u3002\u56e0\u4e3a\u6bcf\u4e00\u6b21\u6309 batchSize \u7684\u8bbe\u7f6e\u53ea\u8fd4\u56de\u4e861\u6761\u6570\u636e\uff0c\u7136\u540e\u8fde\u63a5\u5c31\u5173\u95ed\u4e86\u3002<\/p>\n
\u800c\u6211\u4eec\u53ea\u9700\u8981\u7a0d\u505a\u4fee\u6539\uff0c\u5c06 batchSize \u6539\u62102\uff0c\u60c5\u51b5\u5c31\u5927\u4e3a\u4e0d\u540c<\/p>\n
$cursor = $c->find()->sort( array( 'name' => 1 ) );\n$cursor->batchSize( 2 )->limit( 10 );\n$cursor->getNext(); \/\/ item 1\n$cursor->getNext(); \/\/ item 2\nvar_dump( $cursor->getNext() ); \/\/ item 3<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u867d\u7136\u7b2c\u4e00\u6b21\u7f51\u7edc\u8fd4\u56de\u5305\u88ab\u8bbe\u7f6e\u53ea\u8fd4\u56de\u4e24\u6761\u6570\u636e\uff0c\u4f46\u662f\u6bcf\u4e09\u6b21\u8c03 getNext \u65f6\u8fd8\u662f\u8fd4\u56de\u6570\u636e\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd8\u662f\u4ece\u670d\u52a1\u5668\u7b2c\u4e8c\u6b21\u83b7\u53d6\u5230\u6570\u636e\u4e86\u3002<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u901a\u8fc7\u4e0a\u9762\u7684\u5b9e\u9a8c\u7ed3\u679c\uff0c\u6211\u4eec\u5df2\u7ecf\u5927\u81f4\u5bf9 MongoDB \u5ba2\u6237\u7aef\u670d\u52a1\u5668\u901a\u4fe1\u534f\u8bae\u6709\u4e86\u5927\u81f4\u7684\u4e86\u89e3\uff0c\u66f4\u8be6\u7ec6\u7684\u5185\u5bb9\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5728 MongoDB \u5b98\u65b9\u6587\u6863\u4e2d\u627e\u5230\uff08Mongo Wire Protocal<\/a>\uff09<\/p>\n
\u6765\u6e90\uff1aderickrethans.nl<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
MongoDB \u7684 PHP \u5ba2\u6237\u7aef\u6709\u4e00\u4e2a MongoCursor \u7c7b\uff0c\u5b83\u662f\u7528\u4e8e\u83b7\u53d6\u4e00\u6b21\u67e5\u8be2\u7ed3\u679c\u96c6\u7684\u53e5\u67c4\uff08\u6216\u8005\u53eb\u6e38\u6807\uff09\uff0c\u8fd9\u4e2a\u7b80\u5355\u7684\u53d6\u6570\u636e\u64cd\u4f5c\uff0c\u5185\u90e8\u5b9e\u73b0\u5176\u5b9e\u4e0d\u662f\u90a3\u4e48\u7b80\u5355\u3002\u672c\u6587\u5c31\u901a\u8fc7\u5bf9 MongoCursor \u7c7b\u4e00\u4e9b\u64cd\u4f5c\u8fdb\u884c\u5206\u6790\uff0c\u5411\u5927\u5bb6\u63ed\u5f00 MongoDB \u5ba2\u6237\u7aef\u670d\u52a1\u5668\u901a\u4fe1\u7684\u4e00\u4e9b\u5185\u90e8\u7ec6\u8282\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[477,475,478,474,22,476],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1270"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1270"}],"version-history":[{"count":0,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1270\/revisions"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}