{"id":58395,"date":"2024-10-12T20:21:46","date_gmt":"2024-10-12T12:21:46","guid":{"rendered":"https:\/\/server.hk\/cnblog\/58395\/"},"modified":"2024-10-12T20:21:46","modified_gmt":"2024-10-12T12:21:46","slug":"android%e5%a4%9a%e8%a1%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e6%93%8d%e4%bd%9c-android-%e6%95%b8%e6%93%9a%e5%ba%ab-%e5%a4%9a%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/58395\/","title":{"rendered":"Android\u591a\u8868\u6578\u64da\u5eab\u64cd\u4f5c (android \u6578\u64da\u5eab \u591a\u8868)"},"content":{"rendered":"

Android\u591a\u8868\u6578\u64da\u5eab\u64cd\u4f5c (android \u6578\u64da\u5eab \u591a\u8868)<\/h1>\n

\u5728Android\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u64cd\u4f5c\u662f\u61c9\u7528\u7a0b\u5f0f\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u96a8\u8457\u61c9\u7528\u7a0b\u5f0f\u7684\u8907\u96dc\u6027\u589e\u52a0\uff0c\u958b\u767c\u8005\u7d93\u5e38\u9700\u8981\u8655\u7406\u591a\u500b\u6578\u64da\u8868\u4e4b\u9593\u7684\u95dc\u4fc2\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Android\u4e2d\u9032\u884c\u591a\u8868\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

1. Android\u6578\u64da\u5eab\u6982\u8ff0<\/h2>\n

Android\u4e3b\u8981\u4f7f\u7528SQLite\u4f5c\u70ba\u5167\u5efa\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u3002SQLite\u662f\u4e00\u500b\u8f15\u91cf\u7d1a\u7684\u95dc\u806f\u6578\u64da\u5eab\uff0c\u9069\u5408\u7528\u65bc\u79fb\u52d5\u8a2d\u5099\u3002\u5b83\u652f\u6301\u591a\u8868\u64cd\u4f5c\uff0c\u5141\u8a31\u958b\u767c\u8005\u5275\u5efa\u3001\u67e5\u8a62\u548c\u7ba1\u7406\u591a\u500b\u6578\u64da\u8868\u3002<\/p>\n

2. \u5275\u5efa\u6578\u64da\u8868<\/h2>\n

\u5728\u9032\u884c\u591a\u8868\u64cd\u4f5c\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5275\u5efa\u6578\u64da\u8868\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5275\u5efa\u5169\u500b\u6578\u64da\u8868\uff1a\u7528\u6236\u8868\u548c\u8a02\u55ae\u8868\u3002<\/p>\n

public class DatabaseHelper extends SQLiteOpenHelper {\n    private static final String DATABASE_NAME = \"mydatabase.db\";\n    private static final int DATABASE_VERSION = 1;\n\n    public DatabaseHelper(Context context) {\n        super(context, DATABASE_NAME, null, DATABASE_VERSION);\n    }\n\n    @Override\n    public void onCreate(SQLiteDatabase db) {\n        String createUserTable = \"CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)\";\n        String createOrderTable = \"CREATE TABLE orders (id INTEGER PRIMARY KEY, userId INTEGER, amount REAL, \" +\n                                   \"FOREIGN KEY(userId) REFERENCES users(id))\";\n        db.execSQL(createUserTable);\n        db.execSQL(createOrderTable);\n    }\n\n    @Override\n    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {\n        db.execSQL(\"DROP TABLE IF EXISTS orders\");\n        db.execSQL(\"DROP TABLE IF EXISTS users\");\n        onCreate(db);\n    }\n}<\/code><\/pre>\n
3. \u63d2\u5165\u6578\u64da<\/h2>\n
\u5275\u5efa\u6578\u64da\u8868\u5f8c\uff0c\u53ef\u4ee5\u63d2\u5165\u6578\u64da\u3002\u4ee5\u4e0b\u4ee3\u78bc\u5c55\u793a\u5982\u4f55\u5411\u7528\u6236\u8868\u548c\u8a02\u55ae\u8868\u4e2d\u63d2\u5165\u6578\u64da\u3002<\/p>\n
public void insertUser(String name) {\n    SQLiteDatabase db = this.getWritableDatabase();\n    ContentValues values = new ContentValues();\n    values.put(\"name\", name);\n    db.insert(\"users\", null, values);\n}\n\npublic void insertOrder(int userId, double amount) {\n    SQLiteDatabase db = this.getWritableDatabase();\n    ContentValues values = new ContentValues();\n    values.put(\"userId\", userId);\n    values.put(\"amount\", amount);\n    db.insert(\"orders\", null, values);\n}<\/code><\/pre>\n
4. \u67e5\u8a62\u6578\u64da<\/h2>\n
\u5728\u591a\u8868\u64cd\u4f5c\u4e2d\uff0c\u67e5\u8a62\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u6b65\u3002\u4ee5\u4e0b\u4ee3\u78bc\u5c55\u793a\u5982\u4f55\u67e5\u8a62\u7528\u6236\u53ca\u5176\u8a02\u55ae\u4fe1\u606f\u3002<\/p>\n
public Cursor getUserOrders() {\n    SQLiteDatabase db = this.getReadableDatabase();\n    String query = \"SELECT users.name, orders.amount FROM users \" +\n                   \"JOIN orders ON users.id = orders.userId\";\n    return db.rawQuery(query, null);\n}<\/code><\/pre>\n
5. \u66f4\u65b0\u548c\u522a\u9664\u6578\u64da<\/h2>\n
\u9664\u4e86\u63d2\u5165\u548c\u67e5\u8a62\uff0c\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\u4e5f\u662f\u591a\u8868\u64cd\u4f5c\u4e2d\u5e38\u898b\u7684\u9700\u6c42\u3002\u4ee5\u4e0b\u662f\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\u7684\u793a\u4f8b\u3002<\/p>\n
public void updateUser(int id, String newName) {\n    SQLiteDatabase db = this.getWritableDatabase();\n    ContentValues values = new ContentValues();\n    values.put(\"name\", newName);\n    db.update(\"users\", values, \"id = ?\", new String[]{String.valueOf(id)});\n}\n\npublic void deleteOrder(int orderId) {\n    SQLiteDatabase db = this.getWritableDatabase();\n    db.delete(\"orders\", \"id = ?\", new String[]{String.valueOf(orderId)});\n}<\/code><\/pre>\n
6. \u5c0f\u7d50<\/h2>\n
\u5728Android\u958b\u767c\u4e2d\uff0c\u8655\u7406\u591a\u8868\u6578\u64da\u5eab\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u901a\u904e\u4f7f\u7528SQLite\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5275\u5efa\u3001\u63d2\u5165\u3001\u67e5\u8a62\u3001\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5f8c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u61c9\u7528\u7a0b\u5f0f\u4e2d\u7684\u6578\u64da\u3002<\/p>\n
\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u96f2\u7aef\u74b0\u5883\u4e2d\u904b\u884c\u60a8\u7684\u61c9\u7528\u7a0b\u5f0f\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Android\u591a\u8868\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u7ba1\u7406\u548c\u67e5\u8a62\u591a\u500b\u6578\u64da\u8868\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u8207\u6578\u64da\u8655\u7406\u6548\u7387\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-58395","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58395","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=58395"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58395\/revisions"}],"predecessor-version":[{"id":58396,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58395\/revisions\/58396"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=58395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=58395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=58395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}