{"id":181676,"date":"2024-11-09T19:04:22","date_gmt":"2024-11-09T11:04:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/181676\/"},"modified":"2024-11-09T19:04:23","modified_gmt":"2024-11-09T11:04:23","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e7%a9%b6java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7%ef%bc%88java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/181676\/","title":{"rendered":"\u6df1\u5165\u63a2\u7a76Java\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u6280\u5de7\uff08java\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\uff09"},"content":{"rendered":"<h1 id=\"%e6%b7%b1%e5%85%a5%e6%8e%a2%e7%a9%b6java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e6%8a%80%e5%b7%a7%ef%bc%88java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-xBaNmeEFEN\">\u6df1\u5165\u63a2\u7a76Java\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u6280\u5de7\uff08java\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u8edf\u4ef6\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u5df2\u7d93\u6210\u70ba\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\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eJava\u4e2d\u7684\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u6280\u5de7\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%ef%bc%9f-xBaNmeEFEN\">\u4ec0\u9ebc\u662f\u689d\u4ef6\u67e5\u8a62\uff1f<\/h2>\n<p>\u689d\u4ef6\u67e5\u8a62\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6aa2\u7d22\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u4e9b\u689d\u4ef6\u53ef\u4ee5\u662f\u57fa\u65bc\u67d0\u4e9b\u5b57\u6bb5\u7684\u503c\u3001\u7bc4\u570d\u6216\u5176\u4ed6\u908f\u8f2f\u904b\u7b97\u3002\u4f7f\u7528\u689d\u4ef6\u67e5\u8a62\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\uff0c\u4e26\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002<\/p>\n<h2 id=\"java%e4%b8%ad%e9%80%b2%e8%a1%8c%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-xBaNmeEFEN\">Java\u4e2d\u9032\u884c\u689d\u4ef6\u67e5\u8a62\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u901a\u5e38\u4f7f\u7528JDBC\uff08Java Database Connectivity\uff09API\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528JDBC\u9032\u884c\u689d\u4ef6\u67e5\u8a62\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u52a0\u8f09\u6578\u64da\u5eab\u9a45\u52d5\u7a0b\u5e8f\u3002<\/li>\n<li>\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002<\/li>\n<li>\u5275\u5efa\u4e00\u500bStatement\u6216PreparedStatement\u5c0d\u8c61\u3002<\/li>\n<li>\u57f7\u884c\u67e5\u8a62\u4e26\u8655\u7406\u7d50\u679c\u3002<\/li>\n<li>\u95dc\u9589\u9023\u63a5\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-xBaNmeEFEN\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<pre><code>import java.sql.Connection;\nimport java.sql.DriverManager;\nimport java.sql.PreparedStatement;\nimport java.sql.ResultSet;\n\npublic class DatabaseQuery {\n    public static void main(String[] args) {\n        String url = \"jdbc:mysql:\/\/localhost:3306\/yourdatabase\";\n        String user = \"yourusername\";\n        String password = \"yourpassword\";\n\n        try {\n            \/\/ \u52a0\u8f09\u9a45\u52d5\u7a0b\u5e8f\n            Class.forName(\"com.mysql.cj.jdbc.Driver\");\n            \/\/ \u5efa\u7acb\u9023\u63a5\n            Connection connection = DriverManager.getConnection(url, user, password);\n            \/\/ \u5275\u5efaPreparedStatement\n            String sql = \"SELECT * FROM users WHERE age &gt; ?\";\n            PreparedStatement preparedStatement = connection.prepareStatement(sql);\n            preparedStatement.setInt(1, 18);\n            \/\/ \u57f7\u884c\u67e5\u8a62\n            ResultSet resultSet = preparedStatement.executeQuery();\n\n            \/\/ \u8655\u7406\u7d50\u679c\n            while (resultSet.next()) {\n                System.out.println(\"User: \" + resultSet.getString(\"name\"));\n            }\n\n            \/\/ \u95dc\u9589\u9023\u63a5\n            resultSet.close();\n            preparedStatement.close();\n            connection.close();\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8preparedstatement%e7%9a%84%e5%84%aa%e5%8b%a2-xBaNmeEFEN\">\u4f7f\u7528PreparedStatement\u7684\u512a\u52e2<\/h2>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86PreparedStatement\u4f86\u57f7\u884c\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u6709\u5e7e\u500b\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u5b89\u5168\u6027\uff1a<\/strong>\u4f7f\u7528PreparedStatement\u53ef\u4ee5\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\uff0c\u56e0\u70ba\u5b83\u6703\u81ea\u52d5\u8655\u7406\u7528\u6236\u8f38\u5165\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u6027\u80fd\uff1a<\/strong>PreparedStatement\u5728\u57f7\u884c\u591a\u6b21\u76f8\u540c\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u70ba\u5b83\u53ea\u9700\u7de8\u8b6f\u4e00\u6b21\u3002<\/li>\n<li><strong>\u53ef\u8b80\u6027\uff1a<\/strong>\u4ee3\u78bc\u66f4\u6613\u65bc\u95b1\u8b80\u548c\u7dad\u8b77\uff0c\u56e0\u70ba\u67e5\u8a62\u8a9e\u53e5\u8207\u6578\u64da\u5206\u958b\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%80%b2%e9%9a%8e%e6%8a%80%e5%b7%a7-xBaNmeEFEN\">\u689d\u4ef6\u67e5\u8a62\u7684\u9032\u968e\u6280\u5de7<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u689d\u4ef6\u67e5\u8a62\uff0c\u9084\u6709\u4e00\u4e9b\u9032\u968e\u6280\u5de7\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6-xBaNmeEFEN\">1. \u4f7f\u7528\u591a\u500b\u689d\u4ef6<\/h3>\n<p>\u53ef\u4ee5\u4f7f\u7528AND\u548cOR\u904b\u7b97\u7b26\u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>String sql = \"SELECT * FROM users WHERE age &gt; ? AND city = ?\";\nPreparedStatement preparedStatement = connection.prepareStatement(sql);\npreparedStatement.setInt(1, 18);\npreparedStatement.setString(2, \"Hong Kong\");\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8like%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-xBaNmeEFEN\">2. \u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u9700\u8981\u9032\u884c\u6a21\u7cca\u67e5\u8a62\uff0c\u53ef\u4ee5\u4f7f\u7528LIKE\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>String sql = \"SELECT * FROM users WHERE name LIKE ?\";\npreparedStatement.setString(1, \"%John%\");\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%8e%92%e5%ba%8f%e5%92%8c%e9%99%90%e5%88%b6-xBaNmeEFEN\">3. \u4f7f\u7528\u6392\u5e8f\u548c\u9650\u5236<\/h3>\n<p>\u53ef\u4ee5\u4f7f\u7528ORDER BY\u4f86\u6392\u5e8f\u67e5\u8a62\u7d50\u679c\uff0c\u4e26\u4f7f\u7528LIMIT\u4f86\u9650\u5236\u8fd4\u56de\u7684\u8a18\u9304\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>String sql = \"SELECT * FROM users WHERE age &gt; ? ORDER BY name LIMIT ?\";\npreparedStatement.setInt(1, 18);\npreparedStatement.setInt(2, 10);\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xBaNmeEFEN\">\u7e3d\u7d50<\/h2>\n<p>Java\u4e2d\u7684\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u6280\u5de7\u662f\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u91cd\u8981\u6280\u80fd\u3002\u901a\u904e\u4f7f\u7528JDBC\u548cPreparedStatement\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5b89\u5168\u3001\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u57fa\u672c\u7684\u689d\u4ef6\u67e5\u8a62\u9084\u662f\u9032\u968e\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u9019\u4e9b\u77e5\u8b58\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u5728\u5be6\u969b\u9805\u76ee\u4e2d\u66f4\u597d\u5730\u8655\u7406\u6578\u64da\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\u7684Java\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\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":"<p>\u6df1\u5165\u63a2\u7a76Java\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u6280\u5de7\uff0c\u638c\u63e1\u9ad8\u6548\u67e5\u8a62\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u512a\u5316\u61c9\u7528\u6027\u80fd\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-181676","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181676","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=181676"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181676\/revisions"}],"predecessor-version":[{"id":181677,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181676\/revisions\/181677"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=181676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=181676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=181676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}