{"id":62095,"date":"2024-10-13T16:08:25","date_gmt":"2024-10-13T08:08:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62095\/"},"modified":"2024-10-13T16:08:25","modified_gmt":"2024-10-13T08:08:25","slug":"java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%96%b0%e5%a2%9e%e4%b8%80%e5%88%97%e6%93%8d%e4%bd%9c%e6%8c%87%e5%8d%97-java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%b7%bb%e5%8a%a0%e4%b8%80%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62095\/","title":{"rendered":"Java\u6578\u64da\u5eab\u65b0\u589e\u4e00\u5217\u64cd\u4f5c\u6307\u5357 (java\u6578\u64da\u5eab\u6dfb\u52a0\u4e00\u5217)"},"content":{"rendered":"<h1 id=\"java%e6%95%b8%e6%93%9a%e5%ba%ab%e6%96%b0%e5%a2%9e%e4%b8%80%e5%88%97%e6%93%8d%e4%bd%9c%e6%8c%87%e5%8d%97-phAKMnsarj\">Java\u6578\u64da\u5eab\u65b0\u589e\u4e00\u5217\u64cd\u4f5c\u6307\u5357<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5f0f\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\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728Java\u4e2d\u5c0d\u6578\u64da\u5eab\u9032\u884c\u65b0\u589e\u4e00\u5217\u7684\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e6%ba%96%e5%82%99%e5%b7%a5%e4%bd%9c-phAKMnsarj\">\u6e96\u5099\u5de5\u4f5c<\/h2>\n<p>\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u60a8\u9700\u8981\u78ba\u4fdd\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u5df2\u5b89\u88ddJava\u958b\u767c\u74b0\u5883\uff08JDK\uff09\u3002<\/li>\n<li>\u5df2\u5b89\u88dd\u4e26\u914d\u7f6e\u597d\u6578\u64da\u5eab\uff08\u5982MySQL\u3001PostgreSQL\u7b49\uff09\u3002<\/li>\n<li>\u5df2\u6dfb\u52a0\u76f8\u61c9\u7684\u6578\u64da\u5eab\u9a45\u52d5\u5230\u60a8\u7684\u9805\u76ee\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e6%95%b8%e6%93%9a%e5%ba%ab-phAKMnsarj\">\u9023\u63a5\u6578\u64da\u5eab<\/h2>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528JDBC\u9023\u63a5MySQL\u6578\u64da\u5eab\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>import java.sql.Connection;\nimport java.sql.DriverManager;\nimport java.sql.SQLException;\n\npublic class DatabaseConnection {\n    public static Connection connect() {\n        Connection connection = null;\n        try {\n            String url = \"jdbc:mysql:\/\/localhost:3306\/your_database\";\n            String user = \"your_username\";\n            String password = \"your_password\";\n            connection = DriverManager.getConnection(url, user, password);\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n        return connection;\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e6%96%b0%e5%a2%9e%e4%b8%80%e5%88%97%e7%9a%84sql%e8%aa%9e%e5%8f%a5-phAKMnsarj\">\u65b0\u589e\u4e00\u5217\u7684SQL\u8a9e\u53e5<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u65b0\u589e\u4e00\u5217\u7684\u64cd\u4f5c\u901a\u5e38\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684SQL\u8a9e\u53e5\u683c\u5f0f\uff1a<\/p>\n<pre><code>ALTER TABLE table_name ADD column_name column_type;\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u5728\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u65b0\u589e\u4e00\u5217\u201cage\u201d\uff0c\u5176\u985e\u578b\u70ba\u6574\u6578\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD age INT;\n<\/code><\/pre>\n<h2 id=\"%e5%9c%a8java%e4%b8%ad%e5%9f%b7%e8%a1%8c%e6%96%b0%e5%a2%9e%e4%b8%80%e5%88%97%e6%93%8d%e4%bd%9c-phAKMnsarj\">\u5728Java\u4e2d\u57f7\u884c\u65b0\u589e\u4e00\u5217\u64cd\u4f5c<\/h2>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u5c07\u5728Java\u4e2d\u57f7\u884c\u4e0a\u8ff0SQL\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u5b8c\u6574\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>import java.sql.Connection;\nimport java.sql.DriverManager;\nimport java.sql.SQLException;\nimport java.sql.Statement;\n\npublic class AddColumn {\n    public static void main(String[] args) {\n        Connection connection = DatabaseConnection.connect();\n        Statement statement = null;\n\n        try {\n            if (connection != null) {\n                statement = connection.createStatement();\n                String sql = \"ALTER TABLE users ADD age INT;\";\n                statement.executeUpdate(sql);\n                System.out.println(\"\u6210\u529f\u65b0\u589e\u4e00\u5217\uff1aage\");\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        } finally {\n            try {\n                if (statement != null) statement.close();\n                if (connection != null) connection.close();\n            } catch (SQLException e) {\n                e.printStackTrace();\n            }\n        }\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-phAKMnsarj\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u57f7\u884c\u65b0\u589e\u4e00\u5217\u64cd\u4f5c\u6642\uff0c\u8acb\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u60a8\u6709\u8db3\u5920\u7684\u6b0a\u9650\u4f86\u4fee\u6539\u6578\u64da\u5eab\u7d50\u69cb\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u6b64\u985e\u64cd\u4f5c\u6642\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\u5eab\u3002<\/li>\n<li>\u65b0\u589e\u7684\u5217\u53ef\u4ee5\u8a2d\u7f6e\u9ed8\u8a8d\u503c\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5728\u63d2\u5165\u65b0\u6578\u64da\u6642\u51fa\u73fe\u554f\u984c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-phAKMnsarj\">\u7e3d\u7d50<\/h2>\n<p>\u672c\u6587\u4ecb\u7d39\u4e86\u5982\u4f55\u5728Java\u4e2d\u5c0d\u6578\u64da\u5eab\u9032\u884c\u65b0\u589e\u4e00\u5217\u7684\u64cd\u4f5c\uff0c\u5305\u62ec\u9023\u63a5\u6578\u64da\u5eab\u3001\u57f7\u884cSQL\u8a9e\u53e5\u4ee5\u53ca\u6ce8\u610f\u4e8b\u9805\u3002\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u80fd\u5920\u5e6b\u52a9\u4ed6\u5011\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5f0f\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u6700\u4f73\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728Java\u6578\u64da\u5eab\u4e2d\u65b0\u589e\u4e00\u5217\u7684\u64cd\u4f5c\u6307\u5357\uff0c\u7c21\u55ae\u6b65\u9a5f\u52a9\u4f60\u8f15\u9b06\u5b8c\u6210\u6578\u64da\u5eab\u7d50\u69cb\u7684\u66f4\u65b0\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-62095","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62095","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=62095"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62095\/revisions"}],"predecessor-version":[{"id":62096,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62095\/revisions\/62096"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}