{"id":61023,"date":"2024-10-13T07:47:15","date_gmt":"2024-10-12T23:47:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61023\/"},"modified":"2024-10-13T07:47:15","modified_gmt":"2024-10-12T23:47:15","slug":"db4o%e8%a8%ad%e7%bd%ae%e8%87%aa%e5%a2%9eid%e7%9a%84%e6%96%b9%e6%b3%95%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61023\/","title":{"rendered":"DB4O\u8a2d\u7f6e\u81ea\u589eID\u7684\u65b9\u6cd5\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"db4o%e8%a8%ad%e7%bd%ae%e8%87%aa%e5%a2%9eid%e7%9a%84%e6%96%b9%e6%b3%95%e8%a9%b3%e8%a7%a3-BajHuqeZwv\">DB4O\u8a2d\u7f6e\u81ea\u589eID\u7684\u65b9\u6cd5\u8a73\u89e3<\/h1>\n<p>\u5728\u958b\u767c\u61c9\u7528\u7a0b\u5f0f\u6642\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u662f\u81f3\u95dc\u91cd\u8981\u7684\u4e00\u74b0\u3002DB4O\uff08DataBase for Objects\uff09\u662f\u4e00\u7a2e\u9762\u5411\u5c0d\u8c61\u7684\u6578\u64da\u5eab\uff0c\u7279\u5225\u9069\u5408\u7528\u65bcJava\u548c.NET\u74b0\u5883\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728DB4O\u4e2d\u8a2d\u7f6e\u81ea\u589eID\uff0c\u4ee5\u4fbf\u65bc\u7ba1\u7406\u548c\u8b58\u5225\u6578\u64da\u5be6\u9ad4\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%87%aa%e5%a2%9eid%ef%bc%9f-BajHuqeZwv\">\u4ec0\u9ebc\u662f\u81ea\u589eID\uff1f<\/h2>\n<p>\u81ea\u589eID\u662f\u4e00\u7a2e\u81ea\u52d5\u751f\u6210\u7684\u552f\u4e00\u6a19\u8b58\u7b26\uff0c\u901a\u5e38\u7528\u65bc\u6578\u64da\u5eab\u4e2d\u7684\u4e3b\u9375\u3002\u7576\u65b0\u8a18\u9304\u88ab\u63d2\u5165\u6642\uff0c\u6578\u64da\u5eab\u6703\u81ea\u52d5\u70ba\u5176\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684ID\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u624b\u52d5\u7ba1\u7406ID\u7684\u9ebb\u7169\uff0c\u4e26\u78ba\u4fdd\u6bcf\u500b\u8a18\u9304\u7684\u552f\u4e00\u6027\u3002<\/p>\n<h2 id=\"db4o%e4%b8%ad%e7%9a%84%e8%87%aa%e5%a2%9eid%e8%a8%ad%e7%bd%ae-BajHuqeZwv\">DB4O\u4e2d\u7684\u81ea\u589eID\u8a2d\u7f6e<\/h2>\n<p>\u5728DB4O\u4e2d\uff0c\u4e26\u6c92\u6709\u5167\u5efa\u7684\u81ea\u589eID\u529f\u80fd\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u901a\u904e\u4e00\u4e9b\u7de8\u7a0b\u6280\u5de7\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u8a2d\u7f6e\u81ea\u589eID\u7684\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%80%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8bid%e7%94%9f%e6%88%90%e5%99%a8-BajHuqeZwv\">\u6b65\u9a5f\u4e00\uff1a\u5275\u5efa\u4e00\u500bID\u751f\u6210\u5668<\/h3>\n<p>\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u5275\u5efa\u4e00\u500bID\u751f\u6210\u5668\u985e\uff0c\u9019\u500b\u985e\u5c07\u8ca0\u8cac\u751f\u6210\u552f\u4e00\u7684ID\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684ID\u751f\u6210\u5668\u793a\u4f8b\uff1a<\/p>\n<pre><code>public class IdGenerator {\n    private static int currentId = 0;\n\n    public static int getNextId() {\n        return ++currentId;\n    }\n}\n<\/code><\/pre>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%8c%ef%bc%9a%e5%9c%a8%e6%95%b8%e6%93%9a%e5%af%a6%e9%ab%94%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%87%aa%e5%a2%9eid-BajHuqeZwv\">\u6b65\u9a5f\u4e8c\uff1a\u5728\u6578\u64da\u5be6\u9ad4\u4e2d\u4f7f\u7528\u81ea\u589eID<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u9700\u8981\u5728\u6578\u64da\u5be6\u9ad4\u985e\u4e2d\u4f7f\u7528\u9019\u500bID\u751f\u6210\u5668\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u6578\u64da\u5be6\u9ad4\u985e\uff1a<\/p>\n<pre><code>public class User {\n    private int id;\n    private String name;\n\n    public User(String name) {\n        this.id = IdGenerator.getNextId();\n        this.name = name;\n    }\n\n    public int getId() {\n        return id;\n    }\n\n    public String getName() {\n        return name;\n    }\n}\n<\/code><\/pre>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%89%ef%bc%9a%e4%bf%9d%e5%ad%98%e6%95%b8%e6%93%9a%e5%af%a6%e9%ab%94-BajHuqeZwv\">\u6b65\u9a5f\u4e09\uff1a\u4fdd\u5b58\u6578\u64da\u5be6\u9ad4<\/h3>\n<p>\u7576\u6211\u5011\u5275\u5efa\u65b0\u7684\u7528\u6236\u5be6\u9ad4\u6642\uff0cID\u5c07\u81ea\u52d5\u751f\u6210\u4e26\u5206\u914d\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5c07\u7528\u6236\u5be6\u9ad4\u4fdd\u5b58\u5230DB4O\u4e2d\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>import com.db4o.Db4oEmbedded;\nimport com.db4o.ObjectContainer;\n\npublic class Main {\n    public static void main(String[] args) {\n        ObjectContainer db = Db4oEmbedded.openFile(\"database.db4o\");\n\n        try {\n            User user1 = new User(\"Alice\");\n            User user2 = new User(\"Bob\");\n\n            db.store(user1);\n            db.store(user2);\n        } finally {\n            db.close();\n        }\n    }\n}\n<\/code><\/pre>\n<h2 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