{"id":58423,"date":"2024-10-12T20:33:14","date_gmt":"2024-10-12T12:33:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/58423\/"},"modified":"2024-10-12T20:33:15","modified_gmt":"2024-10-12T12:33:15","slug":"android%e5%a6%82%e4%bd%95%e5%b0%8d%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f-android-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/58423\/","title":{"rendered":"Android\u5982\u4f55\u5c0d\u67e5\u8a62\u7684\u6578\u64da\u5eab\u9032\u884c\u6392\u5e8f (android \u67e5\u8a62\u6578\u64da\u5eab\u6392\u5e8f)"},"content":{"rendered":"<h1 id=\"android%e5%a6%82%e4%bd%95%e5%b0%8d%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f-android-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8e%92%e5%ba%8f-ohIyTKYIBz\">Android\u5982\u4f55\u5c0d\u67e5\u8a62\u7684\u6578\u64da\u5eab\u9032\u884c\u6392\u5e8f (android \u67e5\u8a62\u6578\u64da\u5eab\u6392\u5e8f)<\/h1>\n<p>\u5728Android\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u662f\u975e\u5e38\u666e\u904d\u7684\uff0c\u5c24\u5176\u662fSQLite\u6578\u64da\u5eab\u3002\u7576\u6211\u5011\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u6578\u64da\u6642\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff0c\u4ee5\u4fbf\u7528\u6236\u80fd\u5920\u66f4\u65b9\u4fbf\u5730\u67e5\u770b\u548c\u5206\u6790\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728Android\u4e2d\u5c0d\u67e5\u8a62\u7684\u6578\u64da\u5eab\u9032\u884c\u6392\u5e8f\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"sqlite%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b0%a1%e4%bb%8b-ohIyTKYIBz\">SQLite\u6578\u64da\u5eab\u7c21\u4ecb<\/h2>\n<p>SQLite\u662f\u4e00\u500b\u8f15\u91cf\u7d1a\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bcAndroid\u61c9\u7528\u4e2d\u3002\u5b83\u4e0d\u9700\u8981\u5b89\u88dd\u548c\u914d\u7f6e\uff0c\u4e26\u4e14\u652f\u6301\u5927\u591a\u6578SQL\u6a19\u6e96\u3002\u958b\u767c\u8005\u53ef\u4ee5\u4f7f\u7528SQLite\u4f86\u5b58\u5132\u61c9\u7528\u7684\u6578\u64da\uff0c\u4e26\u901a\u904eSQL\u8a9e\u53e5\u9032\u884c\u67e5\u8a62\u548c\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-ohIyTKYIBz\">\u6392\u5e8f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u6392\u5e8f\u901a\u5e38\u662f\u901a\u904e\u4f7f\u7528ORDER BY\u5b50\u53e5\u4f86\u5be6\u73fe\u7684\u3002\u9019\u500b\u5b50\u53e5\u53ef\u4ee5\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5217\u7684\u503c\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u5347\u5e8f\u6216\u964d\u5e8f\u6392\u5e8f\u3002\u4ee5\u4e0b\u662fORDER BY\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM table_name ORDER BY column1 [ASC|DESC];<\/code><\/pre>\n<p>\u5176\u4e2d\uff0cASC\u8868\u793a\u5347\u5e8f\uff0cDESC\u8868\u793a\u964d\u5e8f\u3002\u5982\u679c\u4e0d\u6307\u5b9a\u6392\u5e8f\u65b9\u5f0f\uff0c\u9ed8\u8a8d\u70ba\u5347\u5e8f\u3002<\/p>\n<h2 id=\"%e5%9c%a8android%e4%b8%ad%e4%bd%bf%e7%94%a8sqlite%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f-ohIyTKYIBz\">\u5728Android\u4e2d\u4f7f\u7528SQLite\u9032\u884c\u6392\u5e8f<\/h2>\n<p>\u5728Android\u4e2d\u4f7f\u7528SQLite\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u6392\u5e8f\u7684\u904e\u7a0b\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u5275\u5efa\u6578\u64da\u5eab\u548c\u8868\u683c<\/li>\n<li>\u63d2\u5165\u6578\u64da<\/li>\n<li>\u67e5\u8a62\u6578\u64da\u4e26\u9032\u884c\u6392\u5e8f<\/li>\n<\/ul>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e5%92%8c%e8%a1%a8%e6%a0%bc-ohIyTKYIBz\">1. \u5275\u5efa\u6578\u64da\u5eab\u548c\u8868\u683c<\/h3>\n<p>\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u5275\u5efa\u4e00\u500bSQLite\u6578\u64da\u5eab\u548c\u4e00\u500b\u8868\u683c\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u6578\u64da\u5eab\u548c\u8868\u683c\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>public class DatabaseHelper extends SQLiteOpenHelper {\n    private static final String DATABASE_NAME = \"example.db\";\n    private static final int DATABASE_VERSION = 1;\n    private static final String TABLE_NAME = \"users\";\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 createTable = \"CREATE TABLE \" + TABLE_NAME + \" (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)\";\n        db.execSQL(createTable);\n    }\n\n    @Override\n    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {\n        db.execSQL(\"DROP TABLE IF EXISTS \" + TABLE_NAME);\n        onCreate(db);\n    }\n}<\/code><\/pre>\n<h3 id=\"2-%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a-ohIyTKYIBz\">2. \u63d2\u5165\u6578\u64da<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u9700\u8981\u63d2\u5165\u4e00\u4e9b\u6578\u64da\u5230\u8868\u683c\u4e2d\uff1a<\/p>\n<pre><code>public void insertUser(String name, int age) {\n    SQLiteDatabase db = this.getWritableDatabase();\n    ContentValues values = new ContentValues();\n    values.put(\"name\", name);\n    values.put(\"age\", age);\n    db.insert(TABLE_NAME, null, values);\n    db.close();\n}<\/code><\/pre>\n<h3 id=\"3-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e4%b8%a6%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f-ohIyTKYIBz\">3. \u67e5\u8a62\u6578\u64da\u4e26\u9032\u884c\u6392\u5e8f<\/h3>\n<p>\u6700\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528ORDER BY\u5b50\u53e5\u4f86\u67e5\u8a62\u4e26\u6392\u5e8f\u6578\u64da\uff1a<\/p>\n<pre><code>public Cursor getAllUsersSortedByAge() {\n    SQLiteDatabase db = this.getReadableDatabase();\n    return db.rawQuery(\"SELECT * FROM \" + TABLE_NAME + \" ORDER BY age ASC\", null);\n}<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u67e5\u8a62\u4e86\u6240\u6709\u7528\u6236\u4e26\u6839\u64da\u5e74\u9f61\u9032\u884c\u4e86\u5347\u5e8f\u6392\u5e8f\u3002\u8fd4\u56de\u7684Cursor\u5c0d\u8c61\u53ef\u4ee5\u7528\u4f86\u904d\u6b77\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ohIyTKYIBz\">\u7e3d\u7d50<\/h2>\n<p>\u5728Android\u4e2d\u5c0dSQLite\u6578\u64da\u5eab\u9032\u884c\u6392\u5e8f\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u904e\u7a0b\u3002\u901a\u904e\u4f7f\u7528ORDER BY\u5b50\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u6839\u64da\u9700\u8981\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7684\u53ef\u8b80\u6027\uff0c\u4e5f\u589e\u5f37\u4e86\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u53ef\u7528\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728Android\u4e2d\u5c0d\u67e5\u8a62\u7684\u6578\u64da\u5eab\u9032\u884c\u6392\u5e8f\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u512a\u5316\u7528\u6236\u9ad4\u9a57\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-58423","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58423","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=58423"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58423\/revisions"}],"predecessor-version":[{"id":58424,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58423\/revisions\/58424"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=58423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=58423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=58423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}