Android Slqite 有無索引測試

public class SqliteTest extends ActivityInstrumentationTestCase2<HelloAndroidActivity> {  
  
    private static final String TAG = "SqliteTest";  
  
    private DBHelper dbHelper;  
  
    public SqliteTest() {  
        super(HelloAndroidActivity.class);  
    }  
  
    public SqliteTest(Class<HelloAndroidActivity> activityClass) {  
        super(HelloAndroidActivity.class);  
    }  
  
    @Before  
    public void setUp() throws Exception {  
        super.setUp();  
        this.getActivity().deleteDatabase("test.db");  
        dbHelper = DBHelper.getInsrance(getActivity());  
    }  
  
    @After  
    public void tearDown() throws Exception {  
        dbHelper.close();  
    }  
  
    private int[] sizes = new int[] { 1, 5, 10, 50, 100, 500, 700, 1000, 2500, 5000, 7500, 10000, 20000 };  
  
    @Test  
    public void testIndexPerformace(){  
        doQueryTask(dbHelper.getWritableDatabase(), " ", 50000, 1000);  
        testNoIndexPerformace();  
        testUniqueIndexPerformace();  
        testNornalIndexPerformace();  
    }  
      
    @Test  
    public void testNoIndexPerformace() {  
        SQLiteDatabase db = dbHelper.getWritableDatabase();  
        for (int size : sizes) {  
            doQueryTask(db, "沒有索引", size, 1000);  
        }  
    }  
  
    @Test  
    public void testUniqueIndexPerformace() {  
        SQLiteDatabase db = dbHelper.getWritableDatabase();  
        db.execSQL("create unique index i_users_id on users(_id)");  
        for (int size : sizes) {  
            doQueryTask(db, "唯一索引", size, 1000);  
        }  
    }  
  
    @Test  
    public void testNornalIndexPerformace() {  
        SQLiteDatabase db = dbHelper.getWritableDatabase();  
        db.execSQL("drop index i_users_id");  
        db.execSQL("create index i_users_id on users(_id)");  
        for (int size : sizes) {  
            doQueryTask(db, "普通索引", size, 1000);  
        }  
    }  
  
    private void insertData(SQLiteDatabase db, int size) {  
        db.beginTransaction();  
        try {  
            db.execSQL("delete from users");  
            for (int i = 0; i < size; i++) {  
                db.execSQL("insert into users(name,gender,age,phoneNumber,address) values( 'name', 1, 1, 'tel', 'address')");  
            }  
            db.setTransactionSuccessful();  
        } finally {  
            db.endTransaction();  
        }  
    }  
  
    private void doQueryTask(SQLiteDatabase db, String tag, int size, int times) {  
        insertData(db, size);  
        String sql1 = "select * from users where _id = " + (1 + size >> 1);  
        String sql2 = "select count(_id) from users where _id > " + (size - 1);  
        long start = System.currentTimeMillis();  
        for (int i = 0; i < times; i++) {  
            Cursor c = db.rawQuery(sql1, null);  
            c.moveToNext();  
            c.getInt(0);  
            c.close();  
  
            c = db.rawQuery(sql2, null);  
            c.moveToNext();  
            c.getInt(0);  
            c.close();  
        }  
        Log.i(TAG, tag + " size：" + size + " , time:" + (System.currentTimeMillis() - start));  
    }  
}  

I/SqliteTest(32503): 沒有索引 size：1 , time:2345  
I/SqliteTest(32503): 沒有索引 size：5 , time:2395  
I/SqliteTest(32503): 沒有索引 size：10 , time:2432  
I/SqliteTest(32503): 沒有索引 size：50 , time:2395  
I/SqliteTest(32503): 沒有索引 size：100 , time:2363  
I/SqliteTest(32503): 沒有索引 size：500 , time:2390  
I/SqliteTest(32503): 沒有索引 size：700 , time:2349  
I/SqliteTest(32503): 沒有索引 size：1000 , time:2398  
I/SqliteTest(32503): 沒有索引 size：2500 , time:2348  
I/SqliteTest(32503): 沒有索引 size：5000 , time:2343  
I/SqliteTest(32503): 沒有索引 size：7500 , time:2415  
I/SqliteTest(32503): 沒有索引 size：10000 , time:2402  
I/SqliteTest(32503): 沒有索引 size：20000 , time:2420  
  
I/SqliteTest(32503): 唯一索引 size：1 , time:2346  
I/SqliteTest(32503): 唯一索引 size：5 , time:2456  
I/SqliteTest(32503): 唯一索引 size：10 , time:2393  
I/SqliteTest(32503): 唯一索引 size：50 , time:2488  
I/SqliteTest(32503): 唯一索引 size：100 , time:2376  
I/SqliteTest(32503): 唯一索引 size：500 , time:2445  
I/SqliteTest(32503): 唯一索引 size：700 , time:2402  
I/SqliteTest(32503): 唯一索引 size：1000 , time:2340  
I/SqliteTest(32503): 唯一索引 size：2500 , time:2715  
I/SqliteTest(32503): 唯一索引 size：5000 , time:2406  
I/SqliteTest(32503): 唯一索引 size：7500 , time:2380  
I/SqliteTest(32503): 唯一索引 size：10000 , time:2357  
I/SqliteTest(32503): 唯一索引 size：20000 , time:2391  
  
I/SqliteTest(32503): 普通索引 size：1 , time:2376  
I/SqliteTest(32503): 普通索引 size：5 , time:2390  
I/SqliteTest(32503): 普通索引 size：10 , time:2368  
I/SqliteTest(32503): 普通索引 size：50 , time:2378  
I/SqliteTest(32503): 普通索引 size：100 , time:2403  
I/SqliteTest(32503): 普通索引 size：500 , time:2425  
I/SqliteTest(32503): 普通索引 size：700 , time:2378  
I/SqliteTest(32503): 普通索引 size：1000 , time:2394  
I/SqliteTest(32503): 普通索引 size：2500 , time:2404  
I/SqliteTest(32503): 普通索引 size：5000 , time:2412  
I/SqliteTest(32503): 普通索引 size：7500 , time:2405  
I/SqliteTest(32503): 普通索引 size：10000 , time:2406  
I/SqliteTest(32503): 普通索引 size：20000 , time:2376