android数据库源码

// 创建数据库帮助类
public class MyDatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "mydatabase.db";
    private static final int DATABASE_VERSION = 1;
    private static final String TABLE_NAME = "user";
    private static final String COLUMN_ID = "id";
    private static final String COLUMN_NAME = "name";

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableSql = "CREATE TABLE " + TABLE_NAME + " (" +
                COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                COLUMN_NAME + " TEXT)";
        db.execSQL(createTableSql);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 处理数据库升级逻辑
    }
}

// 使用数据库帮助类进行操作
MyDatabaseHelper dbHelper = new MyDatabaseHelper(context);
SQLiteDatabase db = dbHelper.getWritableDatabase();

// 插入数据
ContentValues values = new ContentValues();
values.put(COLUMN_NAME, "张三");
long newRowId = db.insert(TABLE_NAME, null, values);

// 查询数据
Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);
while (cursor.moveToNext()) {
    int id = cursor.getInt(cursor.getColumnIndexOrThrow(COLUMN_ID));
    String name = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME));
    Log.d("MyDatabase", "ID: " + id + ", Name: " + name);
}

// 关闭数据库连接
cursor.close();
db.close();