{"id":182212,"date":"2024-11-09T21:02:21","date_gmt":"2024-11-09T13:02:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/182212\/"},"modified":"2024-11-09T21:02:22","modified_gmt":"2024-11-09T13:02:22","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e8%a8%8e%e6%95%b8%e6%93%9a%e5%ba%abdao%e6%8c%81%e4%b9%85%e5%b1%a4%e7%9a%84%e8%a8%ad%e8%a8%88%e5%8e%9f%e7%90%86%e8%88%87%e5%af%a6%e7%8f%be%ef%bc%88%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/182212\/","title":{"rendered":"\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eabDAO\u6301\u4e45\u5c64\u7684\u8a2d\u8a08\u539f\u7406\u8207\u5be6\u73fe\uff08\u6578\u64da\u5eabdao\u6301\u4e45\u5c64\u8a2d\u8a08\uff09"},"content":{"rendered":"<h1 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id=\"4-%e9%8c%af%e8%aa%a4%e8%99%95%e7%90%86-JzBZgGYiup\">4. \u932f\u8aa4\u8655\u7406<\/h3>\n<p>DAO\u5c64\u61c9\u8a72\u80fd\u5920\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u7684\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u6e05\u6670\u7684\u932f\u8aa4\u4fe1\u606f\u3002<\/p>\n<h2 id=\"dao%e7%9a%84%e5%af%a6%e7%8f%be%e7%a4%ba%e4%be%8b-JzBZgGYiup\">DAO\u7684\u5be6\u73fe\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684DAO\u5be6\u73fe\u793a\u4f8b\uff0c\u4f7f\u7528Java\u8a9e\u8a00\u548cJDBC\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\uff1a<\/p>\n<pre><code>public class User {\n    private int id;\n    private String name;\n    private String email;\n\n    \/\/ getters and setters\n}\n\npublic interface UserDao {\n    void addUser(User user);\n    User getUser(int id);\n    void updateUser(User user);\n    void deleteUser(int id);\n}\n\npublic class UserDaoImpl implements UserDao {\n    private Connection connection;\n\n    public UserDaoImpl(Connection connection) {\n        this.connection = connection;\n    }\n\n    @Override\n    public void addUser(User user) {\n        String sql = \"INSERT INTO users (name, email) VALUES (?, ?)\";\n        try (PreparedStatement stmt = connection.prepareStatement(sql)) {\n            stmt.setString(1, user.getName());\n            stmt.setString(2, user.getEmail());\n            stmt.executeUpdate();\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n    @Override\n    public User getUser(int id) {\n        String sql = \"SELECT * FROM users WHERE id = ?\";\n        User user = null;\n        try (PreparedStatement stmt = connection.prepareStatement(sql)) {\n            stmt.setInt(1, id);\n            ResultSet rs = stmt.executeQuery();\n            if (rs.next()) {\n                user = new User();\n                user.setId(rs.getInt(\"id\"));\n                user.setName(rs.getString(\"name\"));\n                user.setEmail(rs.getString(\"email\"));\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n        return user;\n    }\n\n    @Override\n    public void updateUser(User user) {\n        String sql = \"UPDATE users SET name = ?, email = ? WHERE id = ?\";\n        try (PreparedStatement stmt = connection.prepareStatement(sql)) {\n            stmt.setString(1, user.getName());\n            stmt.setString(2, user.getEmail());\n            stmt.setInt(3, user.getId());\n            stmt.executeUpdate();\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n\n    @Override\n    public void deleteUser(int id) {\n        String sql = \"DELETE FROM users WHERE id = ?\";\n        try (PreparedStatement stmt = connection.prepareStatement(sql)) {\n            stmt.setInt(1, id);\n            stmt.executeUpdate();\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-JzBZgGYiup\">\u7d50\u8ad6<\/h2>\n<p>DAO\u6301\u4e45\u5c64\u7684\u8a2d\u8a08\u539f\u7406\u8207\u5be6\u73fe\u5c0d\u65bc\u69cb\u5efa\u53ef\u7dad\u8b77\u548c\u53ef\u64f4\u5c55\u7684\u61c9\u7528\u7a0b\u5f0f\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u9075\u5faa\u55ae\u4e00\u8077\u8cac\u539f\u5247\u3001\u63a5\u53e3\u8207\u5be6\u73fe\u5206\u96e2\u3001\u4e8b\u52d9\u7ba1\u7406\u548c\u932f\u8aa4\u8655\u7406\u7b49\u539f\u5247\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u8a2a\u554f\u908f\u8f2f\u3002\u96a8\u8457\u6280\u8853\u7684\u767c\u5c55\uff0cDAO\u6a21\u5f0f\u4e5f\u5728\u4e0d\u65b7\u6f14\u9032\uff0c\u672a\u4f86\u53ef\u80fd\u6703\u51fa\u73fe\u66f4\u591a\u7684\u6700\u4f73\u5be6\u8e10\u548c\u5de5\u5177\u4f86\u652f\u6301\u9019\u4e00\u6a21\u5f0f\u7684\u5be6\u73fe\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72\u60a8\u7684\u61c9\u7528\u7a0b\u5f0f\uff0c\u4eab\u53d7\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u914d\u7f6e\u9078\u64c7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eabDAO\u6301\u4e45\u5c64\u7684\u8a2d\u8a08\u539f\u7406\u8207\u5be6\u73fe\uff0c\u63ed\u793a\u9ad8\u6548\u6578\u64da\u5b58\u53d6\u8207\u7ba1\u7406\u7684\u95dc\u9375\u6280\u8853\u8207\u6700\u4f73\u5be6\u8e10\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-182212","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/182212","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=182212"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/182212\/revisions"}],"predecessor-version":[{"id":182213,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/182212\/revisions\/182213"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=182212"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=182212"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=182212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}