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1 package com.tutorial.f1.chapter31;
2
3 import java.io.File  ;
4
5 import com.db4o.Db4o;
6 import com.db4o.ObjectContainer;
7 import com.db4o.ObjectSet;
8 import com.db4o.f1.Util;
9 import com.db4o.query.Query;
10 import com.db4o.diagnostic.*;
11
12
13 public class DiagnosticExample extends Util {
14 public static void testEmpty() {
15 Db4o.configure().diagnostic().addListener(new DiagnosticToConsole());
16 new File (Util.YAPFILENAME).delete();
17 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
18 try {
19 setEmptyObject(db);
20 }
21 finally {
22 db.close();
23 }
24 }
25
26 private static void setEmptyObject(ObjectContainer db){
27 Empty empty = new Empty();
28 db.set(empty);
29 }
30
31 public static void testArbitrary() {
32 Db4o.configure().diagnostic().addListener(new DiagnosticToConsole());
33 new File (Util.YAPFILENAME).delete();
34 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
35 try {
36 Pilot pilot = new Pilot("Rubens Barrichello",99);
37 db.set(pilot);
38 queryPilot(db);
39 }
40 finally {
41 db.close();
42 }
43 }
44
45 private static void queryPilot(ObjectContainer db){
46 int[] i = new int[]{19,100};
47 ObjectSet result = db.query(new ArbitraryQuery(i));
48 listResult(result);
49 }
50 public static void testIndexDiagnostics() {
51 Db4o.configure().diagnostic().removeAllListeners();
52 Db4o.configure().diagnostic().addListener(new IndexDiagListener());
53 Db4o.configure().updateDepth(3);
54 new File (Util.YAPFILENAME).delete();
55 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
56 try {
57 Pilot pilot1 = new Pilot("Rubens Barrichello",99);
58 db.set(pilot1);
59 Pilot pilot2 = new Pilot("Michael Schumacher",100);
60 db.set(pilot2);
61 queryPilot(db);
62 setEmptyObject(db);
63 Query query = db.query();
64 query.constrain(Pilot.class);
65 query.descend("points").constrain(new Integer (99));
66 ObjectSet result = query.execute();
67 listResult(result);
68 }
69 finally {
70 db.close();
71 }
72 }
73
74 }
75 |
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Java API By Example, From Geeks To Geeks.