{"id":179590,"date":"2024-11-09T03:05:43","date_gmt":"2024-11-08T19:05:43","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179590\/"},"modified":"2024-11-09T03:05:44","modified_gmt":"2024-11-08T19:05:44","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-ios-%e4%b8%ad%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e7%9a%84%e5%a4%9a%e7%b7%9a%e7%a8%8b%e8%a8%aa%e5%95%8f%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-ios-%e5%a4%9a%e7%b7%9a%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179590\/","title":{"rendered":"\u5982\u4f55\u5728 iOS \u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab\uff1f (ios \u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab)"},"content":{"rendered":"

\u5982\u4f55\u5728 iOS \u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab\uff1f<\/h1>\n

\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2a\u554f\u6548\u7387\u5c0d\u65bc\u61c9\u7528\u7684\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u7279\u5225\u662f\u5728 iOS \u958b\u767c\u4e2d\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u5be6\u73fe\u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab\u6210\u70ba\u4e86\u958b\u767c\u8005\u9700\u8981\u9762\u5c0d\u7684\u4e00\u500b\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728 iOS \u4e2d\u5be6\u73fe\u9ad8\u6548\u591a\u7dda\u7a0b\u6578\u64da\u5eab\u8a2a\u554f\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n

\u591a\u7dda\u7a0b\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u591a\u7dda\u7a0b\u662f\u6307\u5728\u540c\u4e00\u9032\u7a0b\u4e2d\u540c\u6642\u904b\u884c\u591a\u500b\u7dda\u7a0b\u3002\u6bcf\u500b\u7dda\u7a0b\u53ef\u4ee5\u7368\u7acb\u57f7\u884c\u4efb\u52d9\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u901f\u5ea6\u548c\u6027\u80fd\u3002\u5728 iOS \u4e2d\uff0c\u4f7f\u7528\u591a\u7dda\u7a0b\u53ef\u4ee5\u907f\u514d\u4e3b\u7dda\u7a0b\u88ab\u963b\u585e\uff0c\u5f9e\u800c\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n

\u4f7f\u7528 GCD \u9032\u884c\u591a\u7dda\u7a0b\u6578\u64da\u5eab\u8a2a\u554f<\/h2>\n

Grand Central Dispatch\uff08GCD\uff09\u662f iOS \u63d0\u4f9b\u7684\u4e00\u500b\u5f37\u5927\u7684\u591a\u7dda\u7a0b\u7de8\u7a0b\u5de5\u5177\u3002\u5b83\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u8f15\u9b06\u5730\u7ba1\u7406\u7dda\u7a0b\uff0c\u4e26\u5be6\u73fe\u9ad8\u6548\u7684\u4e26\u884c\u8655\u7406\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 GCD \u9032\u884c\u6578\u64da\u5eab\u8a2a\u554f\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n

import UIKit\nimport SQLite3\n\nclass DatabaseManager {\n    var db: OpaquePointer?\n\n    init() {\n        \/\/ \u6253\u958b\u6578\u64da\u5eab\n        db = openDatabase()\n    }\n\n    func openDatabase() -> OpaquePointer? {\n        var db: OpaquePointer? = nil\n        let filePath = \"path\/to\/database.sqlite\"\n        if sqlite3_open(filePath, &db) == SQLITE_OK {\n            print(\"\u6210\u529f\u6253\u958b\u6578\u64da\u5eab\")\n        } else {\n            print(\"\u7121\u6cd5\u6253\u958b\u6578\u64da\u5eab\")\n        }\n        return db\n    }\n\n    func fetchData(completion: @escaping ([String]) -> Void) {\n        DispatchQueue.global(qos: .background).async {\n            var result: [String] = []\n            \/\/ \u57f7\u884c\u67e5\u8a62\n            let query = \"SELECT name FROM users\"\n            var statement: OpaquePointer?\n            if sqlite3_prepare_v2(self.db, query, -1, &statement, nil) == SQLITE_OK {\n                while sqlite3_step(statement) == SQLITE_ROW {\n                    let name = String(cString: sqlite3_column_text(statement, 0))\n                    result.append(name)\n                }\n            }\n            sqlite3_finalize(statement)\n            \/\/ \u56de\u5230\u4e3b\u7dda\u7a0b\u66f4\u65b0 UI\n            DispatchQueue.main.async {\n                completion(result)\n            }\n        }\n    }\n}\n<\/code><\/pre>\n
\u4f7f\u7528 NSOperationQueue \u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c<\/h2>\n
\u9664\u4e86 GCD\uff0cNSOperationQueue \u4e5f\u662f\u4e00\u500b\u7ba1\u7406\u591a\u7dda\u7a0b\u7684\u597d\u9078\u64c7\u3002\u5b83\u63d0\u4f9b\u4e86\u66f4\u9ad8\u5c64\u6b21\u7684\u62bd\u8c61\uff0c\u5141\u8a31\u958b\u767c\u8005\u66f4\u9748\u6d3b\u5730\u63a7\u5236\u4efb\u52d9\u7684\u57f7\u884c\u9806\u5e8f\u548c\u4f9d\u8cf4\u95dc\u4fc2\u3002<\/p>\n
class DatabaseOperation: Operation {\n    var result: [String] = []\n\n    override func main() {\n        if isCancelled { return }\n        \/\/ \u57f7\u884c\u6578\u64da\u5eab\u67e5\u8a62\n        let dbManager = DatabaseManager()\n        dbManager.fetchData { data in\n            self.result = data\n        }\n    }\n}\n\nlet operationQueue = OperationQueue()\nlet dbOperation = DatabaseOperation()\noperationQueue.addOperation(dbOperation)\n<\/code><\/pre>\n
\u907f\u514d\u6578\u64da\u7af6\u722d<\/h2>\n
\u5728\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u7af6\u722d\u662f\u4e00\u500b\u5e38\u898b\u554f\u984c\u3002\u7576\u591a\u500b\u7dda\u7a0b\u540c\u6642\u8a2a\u554f\u548c\u4fee\u6539\u540c\u4e00\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0c\u53ef\u4ee5\u4f7f\u7528\u9396\uff08\u5982 NSLock\uff09\u4f86\u4fdd\u8b77\u5171\u4eab\u8cc7\u6e90\u3002<\/p>\n
let lock = NSLock()\n\nfunc safeFetchData() {\n    lock.lock()\n    defer { lock.unlock() }\n    \/\/ \u57f7\u884c\u6578\u64da\u5eab\u64cd\u4f5c\n}\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728 iOS \u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab\u9700\u8981\u5408\u7406\u4f7f\u7528 GCD \u6216 NSOperationQueue\uff0c\u4e26\u6ce8\u610f\u907f\u514d\u6578\u64da\u7af6\u722d\u3002\u901a\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u5347\u61c9\u7528\u7684\u6027\u80fd\u548c\u7528\u6236\u9ad4\u9a57\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u548c\u670d\u52d9\u5668\u67b6\u69cb\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u9999\u6e2fVPS<\/a> \u548c \u96f2\u670d\u52d9\u5668<\/a> \u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u9078\u64c7\u6700\u4f73\u7684\u89e3\u6c7a\u65b9\u6848\u4ee5\u652f\u6301\u5176\u61c9\u7528\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u5728 iOS \u4e2d\u9ad8\u6548\u5be6\u73fe\u591a\u7dda\u7a0b\u8a2a\u554f\u6578\u64da\u5eab\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u8207\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-179590","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=179590"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179590\/revisions"}],"predecessor-version":[{"id":179591,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179590\/revisions\/179591"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}