{"id":1032,"date":"2014-11-19T21:41:58","date_gmt":"2014-11-19T13:41:58","guid":{"rendered":"http:\/\/blog.turn.tw\/?p=1032"},"modified":"2014-11-20T00:13:45","modified_gmt":"2014-11-19T16:13:45","slug":"laravel%e7%a2%ba%e4%bf%9d%e8%b3%87%e6%96%99%e5%ba%ab%e6%ad%a3%e7%a2%ba%ef%bc%9atransaction%e8%88%87lock","status":"publish","type":"post","link":"https:\/\/blog.turn.tw\/?p=1032","title":{"rendered":"Laravel\u78ba\u4fdd\u8cc7\u6599\u5eab\u6b63\u78ba\uff1atransaction\u8207lock"},"content":{"rendered":"<p>\u6700\u8fd1\u5728\u958b\u767c\u4e0a\u78b0\u5230\u4e00\u500brequest\u8981\u57f7\u884c\u7684\u4efb\u52d9\u6bd4\u8f03\u591a\u3001\u5f8c\u9762\u7684\u4efb\u52d9\u727d\u626f\u5230\u7b2c3\u65b9API\u56e0\u6b64\u6709\u53ef\u80fdfail\uff0c\u6b64\u6642\u524d\u9762\u57f7\u884c\u7684\u4efb\u52d9\u9700\u8981\u5c07\u8cc7\u6599\u56de\u6eaf\u7684\u554f\u984c\u3002<\/p>\n<p>\u53e6\u5916\u9084\u78b0\u5230race condition\u7684\u8cc7\u6599\u5eab\u8cc7\u6599\u540c\u6b65\u554f\u984c\uff1a\u7576\u5169\u500b\u4f7f\u7528\u8005\u540c\u6642\u6309\u4e0b\u67d0\u500b\u6309\u9215\u6642\uff0c\u8cc7\u6599\u5eab\u7684\u8cc7\u6599\u6703\u51fa\u73fe\u554f\u984c\u3002<\/p>\n<p>\u524d\u8005\u9700\u8981\u5229\u7528\u8cc7\u6599\u5eab\u7684transaction\u529f\u80fd\u78ba\u4fdd\u4efb\u52d9\u5168\u57f7\u884c\u6216\u662f\u5168\u4e0d\u57f7\u884c\u3001\u5f8c\u8005\u9700\u8981\u7528\u5230lock\/unlock\u5c07\u67d0\u4e9b\u8cc7\u6599\u8868\u9396\u4f4f\u4e0d\u8b93\u5176\u4ed6\u7a0b\u5e8f\u4fee\u6539\u3002<\/p>\n<p>\u5728Laravel\u4e2d\uff0c\u8a72\u600e\u9ebc\u505a\u5462\uff1f\u67e5\u4e86\u4e00\u4e0b\uff0c\u5927\u6982\u6574\u7406\u51fa\u4f86\u3002<\/p>\n<h3>Transaction<\/h3>\n<p>\u6709\u5169\u7a2e\u4f5c\u6cd5\uff0c\u7b2c1\u7a2e\u4f7f\u7528closure\uff1a<\/p>\n<pre>\r\nDB::transaction(function()\r\n {\r\n      \/\/ do something\r\n });\r\n<\/pre>\n<p>\u7b2c2\u7a2e\u4e5f\u8a31\u6bd4\u8f03\u89aa\u5207\uff0c<\/p>\n<pre>\r\ntry {\r\n    DB::connection()->getPdo()->beginTransaction();\r\n    \/\/ database queries here\r\n    DB::connection()->getPdo()->commit();\r\n} catch (\\PDOException $e) {\r\n    \/\/ Woopsy\r\n    DB::connection()->getPdo()->rollBack();\r\n}\r\n<\/pre>\n<p>\u5728Laravel facades\u7684\u5354\u52a9\u4e0b\uff0c\u9019\u5169\u7a2e\u4f5c\u6cd5\u90fd\u6eff\u7c21\u6f54\u6709\u529b\u7684\u3002<br \/>\n\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u7b2c1\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u82e5\u662fclosure\u8981\u4f7f\u7528\u5230\u57f7\u884cclosure\u4e4b\u524d\u5b9a\u7fa9\u7684\u8b8a\u6578\uff0c\u8a18\u5f97\u4f7f\u7528\u95dc\u9375\u5b57\u300cuse\u300d\uff1a<\/p>\n<pre>\r\nDB::transaction(function() use ($user_id)\r\n{\r\n    \/\/ do something with $user_id\r\n});\r\n<\/pre>\n<h3>Lock<\/h3>\n<p>\u8981\u4fdd\u8b49\u4e00\u6b21\u53ea\u6709\u4e00\u500b\u7a0b\u5e8f\u5728\u4fee\u6539\u67d0\u5e7e\u5f35\u8cc7\u6599\u8868\uff0c\u4ee5Mysql\u4f86\u8aaa\u6709LOCK\u8ddfUNLOCK\u53ef\u4ee5\u7528\u3002Laravel\u4e26\u6c92\u6709\u76f4\u63a5\u652f\u63f4\u6b64\u529f\u80fd\uff0c\u4e0d\u904e\u9019\u6a23\u8b8a\u901a\u5c31\u53ef\u4ee5\u4e86\uff1a<\/p>\n<pre>\r\nDB::connection()->getPdo()->exec( 'LOCK TABLES items WRITE, accounts WRITE, orders WRITE' );\r\n\/\/ blah blah\r\nDB::connection()->getPdo()->exec( 'UNLOCK TABLES' );\r\n<\/pre>\n<p>\u9019\u908a\u4e00\u6b21\u7528WRTIE LOCK\u9396\u4f4f\u4e09\u5f35\u8cc7\u6599\u8868\u3002\u7576\u7136\u4e5f\u6709READ LOCK\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u5728\u958b\u767c\u4e0a\u78b0\u5230\u4e00\u500brequest\u8981\u57f7\u884c\u7684\u4efb\u52d9\u6bd4\u8f03\u591a\u3001\u5f8c\u9762\u7684\u4efb\u52d9\u727d\u626f\u5230\u7b2c3\u65b9API\u56e0\u6b64\u6709\u53ef\u80fdfail\uff0c\u6b64\u6642\u524d\u9762 &hellip; <a href=\"https:\/\/blog.turn.tw\/?p=1032\" class=\"more-link\">\u7e7c\u7e8c\u95b1\u8b80 <span class=\"screen-reader-text\">Laravel\u78ba\u4fdd\u8cc7\u6599\u5eab\u6b63\u78ba\uff1atransaction\u8207lock<\/span> <span class=\"meta-nav\">&rarr;<\/span> <\/a><\/p>\n","protected":false},"author":1,"featured_media":855,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[2],"tags":[14,16,17,15],"_links":{"self":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/1032"}],"collection":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1032"}],"version-history":[{"count":6,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/1032\/revisions"}],"predecessor-version":[{"id":1040,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/1032\/revisions\/1040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/media\/855"}],"wp:attachment":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}