{"id":62057,"date":"2024-10-13T15:49:20","date_gmt":"2024-10-13T07:49:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62057\/"},"modified":"2024-10-13T15:49:20","modified_gmt":"2024-10-13T07:49:20","slug":"java%e6%95%b8%e6%93%9a%e5%ba%abupdate%e8%aa%9e%e5%8f%a5%ef%bc%9a%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e4%bf%ae%e6%94%b9-java%e6%95%b8%e6%93%9a%e5%ba%abupdate%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62057\/","title":{"rendered":"Java\u6578\u64da\u5eabupdate\u8a9e\u53e5\uff1a\u5be6\u73fe\u6578\u64da\u4fee\u6539 (java\u6578\u64da\u5eabupdate\u8a9e\u53e5)"},"content":{"rendered":"<h1 id=\"java%e6%95%b8%e6%93%9a%e5%ba%abupdate%e8%aa%9e%e5%8f%a5%ef%bc%9a%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e4%bf%ae%e6%94%b9-XNbbobTYBw\">Java\u6578\u64da\u5eabupdate\u8a9e\u53e5\uff1a\u5be6\u73fe\u6578\u64da\u4fee\u6539<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002Java\u4f5c\u70ba\u4e00\u7a2e\u5ee3\u6cdb\u4f7f\u7528\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u5f0f\u4f86\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u5176\u4e2d\uff0cupdate\u8a9e\u53e5\u662f\u7528\u65bc\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u73fe\u6709\u6578\u64da\u7684\u91cd\u8981\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eJava\u4e2d\u5982\u4f55\u4f7f\u7528update\u8a9e\u53e5\u4f86\u5be6\u73fe\u6578\u64da\u7684\u4fee\u6539\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afupdate%e8%aa%9e%e5%8f%a5%ef%bc%9f-XNbbobTYBw\">\u4ec0\u9ebc\u662fupdate\u8a9e\u53e5\uff1f<\/h2>\n<p>\u5728SQL\u4e2d\uff0cupdate\u8a9e\u53e5\u7528\u65bc\u66f4\u65b0\u6578\u64da\u5eab\u8868\u4e2d\u7684\u73fe\u6709\u8a18\u9304\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u6839\u64da\u7279\u5b9a\u7684\u689d\u4ef6\u4f86\u9078\u64c7\u9700\u8981\u66f4\u65b0\u7684\u884c\uff0c\u4e26\u5c0d\u5176\u9032\u884c\u4fee\u6539\u3002\u57fa\u672c\u7684update\u8a9e\u53e5\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d\nSET \u5217\u540d1 = \u503c1, \u5217\u540d2 = \u503c2, ...\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u8868\u540d\u662f\u8981\u66f4\u65b0\u7684\u6578\u64da\u8868\uff0c\u5217\u540d\u662f\u9700\u8981\u4fee\u6539\u7684\u5b57\u6bb5\uff0c\u503c\u662f\u65b0\u7684\u6578\u64da\uff0c\u800c\u689d\u4ef6\u5247\u7528\u65bc\u6307\u5b9a\u54ea\u4e9b\u884c\u9700\u8981\u88ab\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8update%e8%aa%9e%e5%8f%a5-XNbbobTYBw\">\u5728Java\u4e2d\u4f7f\u7528update\u8a9e\u53e5<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u6211\u5011\u901a\u5e38\u4f7f\u7528JDBC\uff08Java Database Connectivity\uff09\u4f86\u57f7\u884cSQL\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528JDBC\u57f7\u884cupdate\u8a9e\u53e5\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u52a0\u8f09\u6578\u64da\u5eab\u9a45\u52d5\u7a0b\u5e8f<\/li>\n<li>\u5efa\u7acb\u6578\u64da\u5eab\u9023\u63a5<\/li>\n<li>\u5275\u5efaStatement\u6216PreparedStatement\u5c0d\u8c61<\/li>\n<li>\u57f7\u884cupdate\u8a9e\u53e5<\/li>\n<li>\u8655\u7406\u7d50\u679c<\/li>\n<li>\u95dc\u9589\u9023\u63a5<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-XNbbobTYBw\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528update\u8a9e\u53e5\u4f86\u66f4\u65b0\u6578\u64da\uff1a<\/p>\n<pre><code>import java.sql.Connection;\nimport java.sql.DriverManager;\nimport java.sql.PreparedStatement;\nimport java.sql.SQLException;\n\npublic class UpdateExample {\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        Connection connection = null;\n        PreparedStatement preparedStatement = null;\n\n        try {\n            \/\/ \u52a0\u8f09\u6578\u64da\u5eab\u9a45\u52d5\n            Class.forName(\"com.mysql.cj.jdbc.Driver\");\n            \/\/ \u5efa\u7acb\u9023\u63a5\n            connection = DriverManager.getConnection(url, user, password);\n            \/\/ \u5275\u5efaupdate\u8a9e\u53e5\n            String sql = \"UPDATE users SET email = ? WHERE id = ?\";\n            preparedStatement = connection.prepareStatement(sql);\n            preparedStatement.setString(1, \"newemail@example.com\");\n            preparedStatement.setInt(2, 1);\n            \/\/ \u57f7\u884c\u66f4\u65b0\n            int rowsAffected = preparedStatement.executeUpdate();\n            System.out.println(\"\u66f4\u65b0\u7684\u884c\u6578: \" + rowsAffected);\n        } catch (ClassNotFoundException | SQLException e) {\n            e.printStackTrace();\n        } finally {\n            \/\/ \u95dc\u9589\u8cc7\u6e90\n            try {\n                if (preparedStatement != null) preparedStatement.close();\n                if (connection != null) connection.close();\n            } catch (SQLException e) {\n                e.printStackTrace();\n            }\n        }\n    }\n}<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u52a0\u8f09\u4e86MySQL\u7684JDBC\u9a45\u52d5\uff0c\u7136\u5f8c\u5efa\u7acb\u4e86\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002\u63a5\u8457\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500bPreparedStatement\u5c0d\u8c61\uff0c\u4e26\u8a2d\u7f6e\u4e86\u8981\u66f4\u65b0\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u548c\u7528\u6236ID\u3002\u6700\u5f8c\uff0c\u6211\u5011\u57f7\u884c\u4e86update\u8a9e\u53e5\u4e26\u6253\u5370\u4e86\u53d7\u5f71\u97ff\u7684\u884c\u6578\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-XNbbobTYBw\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528update\u8a9e\u53e5\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li>\u59cb\u7d42\u4f7f\u7528PreparedStatement\u4f86\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\u3002<\/li>\n<li>\u5728\u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u78ba\u4fdd\u5df2\u7d93\u6b63\u78ba\u8a2d\u7f6e\u4e86\u689d\u4ef6\uff0c\u4ee5\u514d\u610f\u5916\u66f4\u65b0\u4e86\u4e0d\u61c9\u8a72\u4fee\u6539\u7684\u6578\u64da\u3002<\/li>\n<li>\u5728\u9032\u884c\u5927\u91cf\u6578\u64da\u66f4\u65b0\u6642\uff0c\u8003\u616e\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XNbbobTYBw\">\u7e3d\u7d50<\/h2>\n<p>Java\u4e2d\u7684update\u8a9e\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528JDBC\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u57f7\u884cupdate\u64cd\u4f5c\uff0c\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u670d\u52d9\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528Java\u6578\u64da\u5eabupdate\u8a9e\u53e5\u5be6\u73fe\u6578\u64da\u4fee\u6539\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u958b\u767c\u6d41\u7a0b\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-62057","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62057","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=62057"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62057\/revisions"}],"predecessor-version":[{"id":62058,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62057\/revisions\/62058"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}