{"id":62033,"date":"2024-10-13T15:38:17","date_gmt":"2024-10-13T07:38:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62033\/"},"modified":"2024-10-13T15:38:17","modified_gmt":"2024-10-13T07:38:17","slug":"java%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%86%e9%a0%81%e9%a1%af%e7%a4%ba%e7%9a%84%e6%96%b9%e6%b3%95-java%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%86%e9%a0%81%e9%a1%af%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62033\/","title":{"rendered":"Java\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u7684\u65b9\u6cd5 (java\u6578\u64da\u5eab\u5206\u9801\u986f\u793a)"},"content":{"rendered":"<h1 id=\"java%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%86%e9%a0%81%e9%a1%af%e7%a4%ba%e7%9a%84%e6%96%b9%e6%b3%95-ZIyMGqldVl\">Java\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u7684\u65b9\u6cd5<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6578\u64da\u7684\u986f\u793a\u65b9\u5f0f\u5c0d\u7528\u6236\u9ad4\u9a57\u81f3\u95dc\u91cd\u8981\u3002\u7576\u6578\u64da\u91cf\u9f90\u5927\u6642\uff0c\u5c07\u6240\u6709\u6578\u64da\u4e00\u6b21\u6027\u986f\u793a\u6703\u5c0e\u81f4\u9801\u9762\u52a0\u8f09\u7de9\u6162\uff0c\u4e26\u4e14\u7528\u6236\u96e3\u4ee5\u627e\u5230\u6240\u9700\u7684\u4fe1\u606f\u3002\u56e0\u6b64\uff0c\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u6210\u70ba\u4e86\u4e00\u7a2e\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Java\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u7684\u5206\u9801\u986f\u793a\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%86%e9%a0%81%e9%a1%af%e7%a4%ba%ef%bc%9f-ZIyMGqldVl\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u662f\u6307\u5c07\u67e5\u8a62\u7d50\u679c\u5206\u6210\u591a\u500b\u9801\u9762\uff0c\u6bcf\u6b21\u53ea\u986f\u793a\u4e00\u90e8\u5206\u6578\u64da\u3002\u9019\u6a23\u4e0d\u50c5\u63d0\u9ad8\u4e86\u9801\u9762\u7684\u52a0\u8f09\u901f\u5ea6\uff0c\u9084\u6539\u5584\u4e86\u7528\u6236\u7684\u700f\u89bd\u9ad4\u9a57\u3002\u901a\u5e38\uff0c\u5206\u9801\u986f\u793a\u9700\u8981\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u8981\u7d20\uff1a<\/p>\n<ul>\n<li>\u6bcf\u9801\u986f\u793a\u7684\u8a18\u9304\u6578\u91cf<\/li>\n<li>\u7576\u524d\u9801\u78bc<\/li>\n<li>\u7e3d\u8a18\u9304\u6578\u91cf<\/li>\n<li>\u7e3d\u9801\u6578<\/li>\n<\/ul>\n<h2 id=\"java%e4%b8%ad%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%86%e9%a0%81%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%ad%a5%e9%a9%9f-ZIyMGqldVl\">Java\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u7684\u57fa\u672c\u6b65\u9a5f<\/h2>\n<p>\u5728Java\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\uff0c\u901a\u5e38\u9700\u8981\u4f7f\u7528SQL\u8a9e\u53e5\u7684LIMIT\u548cOFFSET\u5b50\u53e5\u3002\u4ee5\u4e0b\u662f\u5be6\u73fe\u5206\u9801\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e8%a8%ad%e5%ae%9a%e5%88%86%e9%a0%81%e5%8f%83%e6%95%b8-ZIyMGqldVl\">1. \u8a2d\u5b9a\u5206\u9801\u53c3\u6578<\/h3>\n<p>\u9996\u5148\uff0c\u9700\u8981\u8a2d\u5b9a\u6bcf\u9801\u986f\u793a\u7684\u8a18\u9304\u6578\u91cf\u548c\u7576\u524d\u9801\u78bc\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>int pageSize = 10; \/\/ \u6bcf\u9801\u986f\u793a\u7684\u8a18\u9304\u6578\u91cf\nint currentPage = 1; \/\/ \u7576\u524d\u9801\u78bc<\/code><\/pre>\n<h3 id=\"2-%e8%a8%88%e7%ae%97offset-ZIyMGqldVl\">2. \u8a08\u7b97OFFSET<\/h3>\n<p>\u6839\u64da\u7576\u524d\u9801\u78bc\u548c\u6bcf\u9801\u986f\u793a\u7684\u8a18\u9304\u6578\u91cf\u8a08\u7b97OFFSET\u503c\uff1a<\/p>\n<pre><code>int offset = (currentPage - 1) * pageSize;<\/code><\/pre>\n<h3 id=\"3-%e7%b7%a8%e5%af%absql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-ZIyMGqldVl\">3. \u7de8\u5bebSQL\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<p>\u4f7f\u7528LIMIT\u548cOFFSET\u4f86\u7de8\u5bebSQL\u67e5\u8a62\u8a9e\u53e5\uff1a<\/p>\n<pre><code>String sql = \"SELECT * FROM your_table LIMIT ? OFFSET ?\";<\/code><\/pre>\n<h3 id=\"4-%e5%9f%b7%e8%a1%8c%e6%9f%a5%e8%a9%a2%e4%b8%a6%e7%8d%b2%e5%8f%96%e7%b5%90%e6%9e%9c-ZIyMGqldVl\">4. \u57f7\u884c\u67e5\u8a62\u4e26\u7372\u53d6\u7d50\u679c<\/h3>\n<p>\u4f7f\u7528PreparedStatement\u4f86\u57f7\u884c\u67e5\u8a62\u4e26\u7372\u53d6\u7d50\u679c\uff1a<\/p>\n<pre><code>try (Connection conn = DriverManager.getConnection(url, user, password);\n     PreparedStatement pstmt = conn.prepareStatement(sql)) {\n    pstmt.setInt(1, pageSize);\n    pstmt.setInt(2, offset);\n    \n    ResultSet rs = pstmt.executeQuery();\n    while (rs.next()) {\n        \/\/ \u8655\u7406\u7d50\u679c\n    }\n}<\/code><\/pre>\n<h3 id=\"5-%e7%8d%b2%e5%8f%96%e7%b8%bd%e8%a8%98%e9%8c%84%e6%95%b8%e9%87%8f-ZIyMGqldVl\">5. \u7372\u53d6\u7e3d\u8a18\u9304\u6578\u91cf<\/h3>\n<p>\u70ba\u4e86\u8a08\u7b97\u7e3d\u9801\u6578\uff0c\u9700\u8981\u7372\u53d6\u7e3d\u8a18\u9304\u6578\u91cf\uff1a<\/p>\n<pre><code>String countSql = \"SELECT COUNT(*) FROM your_table\";\ntry (PreparedStatement countPstmt = conn.prepareStatement(countSql);\n     ResultSet countRs = countPstmt.executeQuery()) {\n    if (countRs.next()) {\n        int totalRecords = countRs.getInt(1);\n        int totalPages = (int) Math.ceil((double) totalRecords \/ pageSize);\n    }\n}<\/code><\/pre>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-ZIyMGqldVl\">\u793a\u4f8b\u4ee3\u78bc<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5b8c\u6574\u7684\u793a\u4f8b\u4ee3\u78bc\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5728Java\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\uff1a<\/p>\n<pre><code>import java.sql.*;\n\npublic class PaginationExample {\n    public static void main(String[] args) {\n        String url = \"jdbc:mysql:\/\/localhost:3306\/your_database\";\n        String user = \"your_username\";\n        String password = \"your_password\";\n        \n        int pageSize = 10;\n        int currentPage = 1;\n        int offset = (currentPage - 1) * pageSize;\n\n        String sql = \"SELECT * FROM your_table LIMIT ? OFFSET ?\";\n        String countSql = \"SELECT COUNT(*) FROM your_table\";\n\n        try (Connection conn = DriverManager.getConnection(url, user, password);\n             PreparedStatement pstmt = conn.prepareStatement(sql);\n             PreparedStatement countPstmt = conn.prepareStatement(countSql)) {\n\n            pstmt.setInt(1, pageSize);\n            pstmt.setInt(2, offset);\n            ResultSet rs = pstmt.executeQuery();\n\n            while (rs.next()) {\n                \/\/ \u8655\u7406\u7d50\u679c\n                System.out.println(rs.getString(\"column_name\"));\n            }\n\n            ResultSet countRs = countPstmt.executeQuery();\n            if (countRs.next()) {\n                int totalRecords = countRs.getInt(1);\n                int totalPages = (int) Math.ceil((double) totalRecords \/ pageSize);\n                System.out.println(\"Total Pages: \" + totalPages);\n            }\n\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ZIyMGqldVl\">\u7e3d\u7d50<\/h2>\n<p>\u5728Java\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u901a\u904e\u4f7f\u7528LIMIT\u548cOFFSET\u5b50\u53e5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u67e5\u8a62\u7d50\u679c\u7684\u986f\u793a\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u9084\u6539\u5584\u4e86\u7528\u6236\u7684\u9ad4\u9a57\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u5206\u9801\u986f\u793a\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u529f\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Java\u5be6\u73fe\u6578\u64da\u5eab\u5206\u9801\u986f\u793a\u7684\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u7528\u6236\u754c\u9762\u64cd\u4f5c\uff0c\u8b93\u6578\u64da\u7ba1\u7406\u66f4\u4fbf\u6377\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-62033","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62033","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=62033"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62033\/revisions"}],"predecessor-version":[{"id":62034,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62033\/revisions\/62034"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}