{"id":173515,"date":"2024-11-07T18:40:19","date_gmt":"2024-11-07T10:40:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173515\/"},"modified":"2024-11-07T18:40:20","modified_gmt":"2024-11-07T10:40:20","slug":"%e5%a6%82%e4%bd%95%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e7%b5%84%e7%9a%84%e9%95%b7%e5%ba%a6%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8f%96%e5%87%ba%e4%be%86%e7%9a%84%e6%95%b8%e7%b5%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173515\/","title":{"rendered":"\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\uff1f (\u6578\u64da\u5eab\u53d6\u51fa\u4f86\u7684\u6578\u7d44\u9577\u5ea6)"},"content":{"rendered":"

\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\uff1f (\u6578\u64da\u5eab\u53d6\u51fa\u4f86\u7684\u6578\u7d44\u9577\u5ea6)<\/h1>\n

\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6578\u64da\u4e26\u5c07\u5176\u5b58\u5132\u5728\u6578\u7d44\u4e2d\u3002\u7121\u8ad6\u662f\u4f7f\u7528 PHP\u3001Python \u9084\u662f\u5176\u4ed6\u7de8\u7a0b\u8a9e\u8a00\uff0c\u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\u90fd\u662f\u4e00\u500b\u57fa\u672c\u800c\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u4e0d\u540c\u7684\u7de8\u7a0b\u74b0\u5883\u4e2d\u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n

\u6578\u64da\u5eab\u67e5\u8a62\u8207\u6578\u7d44\u7684\u751f\u6210<\/h2>\n

\u9996\u5148\uff0c\u7576\u6211\u5011\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u6578\u64da\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u9019\u4e9b\u6578\u64da\u901a\u5e38\u6703\u88ab\u5b58\u5132\u5728\u4e00\u500b\u6578\u7d44\u4e2d\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 PHP \u548c MySQL \u7684\u4e00\u500b\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n

<?php\n\/\/ \u9023\u63a5\u5230\u6578\u64da\u5eab\n$conn = new mysqli(\"localhost\", \"username\", \"password\", \"database\");\n\n\/\/ \u6aa2\u67e5\u9023\u63a5\nif ($conn->connect_error) {\n    die(\"\u9023\u63a5\u5931\u6557: \" . $conn->connect_error);\n}\n\n\/\/ \u67e5\u8a62\u6578\u64da\n$sql = \"SELECT * FROM users\";\n$result = $conn->query($sql);\n\n\/\/ \u5c07\u7d50\u679c\u5b58\u5132\u5728\u6578\u7d44\u4e2d\n$dataArray = array();\nif ($result->num_rows > 0) {\n    while($row = $result->fetch_assoc()) {\n        $dataArray[] = $row;\n    }\n}\n\n\/\/ \u7372\u53d6\u6578\u7d44\u7684\u9577\u5ea6\n$arrayLength = count($dataArray);\necho \"\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\u70ba: \" . $arrayLength;\n\n$conn->close();\n?><\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u7136\u5f8c\u57f7\u884c\u4e00\u500b\u67e5\u8a62\u4f86\u7372\u53d6\u6240\u6709\u7528\u6236\u7684\u6578\u64da\u3002\u63a5\u8457\uff0c\u6211\u5011\u5c07\u67e5\u8a62\u7d50\u679c\u5b58\u5132\u5728\u4e00\u500b\u6578\u7d44\u4e2d\uff0c\u4e26\u4f7f\u7528 PHP \u7684 count()<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u6578\u7d44\u7684\u9577\u5ea6\u3002<\/p>\n
\u4f7f\u7528 Python \u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6<\/h2>\n
\u5728 Python \u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 sqlite3<\/code> \u6a21\u7d44\u4f86\u9023\u63a5 SQLite \u6578\u64da\u5eab\uff0c\u4e26\u7372\u53d6\u67e5\u8a62\u7d50\u679c\u7684\u9577\u5ea6\u3002\u4ee5\u4e0b\u662f\u76f8\u61c9\u7684\u793a\u4f8b\uff1a<\/p>\n
import sqlite3\n\n# \u9023\u63a5\u5230\u6578\u64da\u5eab\nconn = sqlite3.connect('example.db')\n\n# \u5275\u5efa\u4e00\u500b\u6e38\u6a19\u5c0d\u8c61\ncursor = conn.cursor()\n\n# \u67e5\u8a62\u6578\u64da\ncursor.execute(\"SELECT * FROM users\")\ndataArray = cursor.fetchall()\n\n# \u7372\u53d6\u6578\u7d44\u7684\u9577\u5ea6\narrayLength = len(dataArray)\nprint(\"\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\u70ba:\", arrayLength)\n\n# \u95dc\u9589\u9023\u63a5\nconn.close()<\/code><\/pre>\n
\u5728\u9019\u500b Python \u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 fetchall()<\/code> \u65b9\u6cd5\u4f86\u7372\u53d6\u6240\u6709\u67e5\u8a62\u7d50\u679c\uff0c\u4e26\u4f7f\u7528 len()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u6578\u7d44\u7684\u9577\u5ea6\u3002<\/p>\n
\u5176\u4ed6\u7de8\u7a0b\u8a9e\u8a00\u7684\u793a\u4f8b<\/h2>\n
\u9664\u4e86 PHP \u548c Python\uff0c\u5176\u4ed6\u7de8\u7a0b\u8a9e\u8a00\u5982 Java\u3001JavaScript \u548c C# \u4e5f\u6709\u985e\u4f3c\u7684\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f Java \u7684\u4e00\u500b\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n
import java.sql.*;\nimport java.util.ArrayList;\n\npublic class Main {\n    public static void main(String[] args) {\n        try {\n            \/\/ \u9023\u63a5\u5230\u6578\u64da\u5eab\n            Connection conn = DriverManager.getConnection(\"jdbc:mysql:\/\/localhost:3306\/database\", \"username\", \"password\");\n            Statement stmt = conn.createStatement();\n            ResultSet rs = stmt.executeQuery(\"SELECT * FROM users\");\n\n            ArrayList<String> dataArray = new ArrayList<>();\n            while (rs.next()) {\n                dataArray.add(rs.getString(\"username\"));\n            }\n\n            \/\/ \u7372\u53d6\u6578\u7d44\u7684\u9577\u5ea6\n            int arrayLength = dataArray.size();\n            System.out.println(\"\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\u70ba: \" + arrayLength);\n\n            conn.close();\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u5728\u9019\u500b Java \u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 ArrayList<\/code> \u4f86\u5b58\u5132\u67e5\u8a62\u7d50\u679c\uff0c\u4e26\u4f7f\u7528 size()<\/code> \u65b9\u6cd5\u4f86\u7372\u53d6\u6578\u7d44\u7684\u9577\u5ea6\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7372\u53d6\u6578\u64da\u5eab\u6578\u7d44\u7684\u9577\u5ea6\u662f\u4e00\u500b\u57fa\u672c\u7684\u64cd\u4f5c\uff0c\u7121\u8ad6\u4f7f\u7528\u54ea\u7a2e\u7de8\u7a0b\u8a9e\u8a00\uff0c\u901a\u5e38\u90fd\u53ef\u4ee5\u901a\u904e\u76f8\u61c9\u7684\u51fd\u6578\u6216\u65b9\u6cd5\u4f86\u5be6\u73fe\u3002\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u5eab\u67e5\u8a62\u548c\u6578\u7d44\u64cd\u4f5c\uff0c\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u6280\u80fd\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u6578\u7d44\u7684\u9577\u5ea6\uff0c\u638c\u63e1\u6709\u6548\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\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-173515","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173515","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=173515"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173515\/revisions"}],"predecessor-version":[{"id":173516,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173515\/revisions\/173516"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}