1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997-2002
* Sleepycat Software. All rights reserved.
*
* $Id: TestTruncate.java,v 1.4 2002/01/23 14:29:52 bostic Exp $
*/
/*
* Simple test for get/put of specific values.
*/
package com.sleepycat.test;
import com.sleepycat.db.*;
import java.io.FileNotFoundException;
public class TestTruncate
{
public static void main(String[] args)
{
try {
Db db = new Db(null, 0);
db.open(null, "my.db", null, Db.DB_BTREE, Db.DB_CREATE, 0644);
// populate our massive database.
Dbt keydbt = new Dbt("key".getBytes());
Dbt datadbt = new Dbt("data".getBytes());
db.put(null, keydbt, datadbt, 0);
// Now, retrieve. We could use keydbt over again,
// but that wouldn't be typical in an application.
Dbt goodkeydbt = new Dbt("key".getBytes());
Dbt badkeydbt = new Dbt("badkey".getBytes());
Dbt resultdbt = new Dbt();
resultdbt.set_flags(Db.DB_DBT_MALLOC);
int ret;
if ((ret = db.get(null, goodkeydbt, resultdbt, 0)) != 0) {
System.out.println("get: " + DbEnv.strerror(ret));
}
else {
String result =
new String(resultdbt.get_data(), 0, resultdbt.get_size());
System.out.println("got data: " + result);
}
if ((ret = db.get(null, badkeydbt, resultdbt, 0)) != 0) {
// We expect this...
System.out.println("get using bad key: " + DbEnv.strerror(ret));
}
else {
String result =
new String(resultdbt.get_data(), 0, resultdbt.get_size());
System.out.println("*** got data using bad key!!: " + result);
}
// Now, truncate and make sure that it's really gone.
System.out.println("truncating data...");
int nrecords = db.truncate(null, 0);
System.out.println("truncate returns " + nrecords);
if ((ret = db.get(null, goodkeydbt, resultdbt, 0)) != 0) {
// We expect this...
System.out.println("after trunctate get: " +
DbEnv.strerror(ret));
}
else {
String result =
new String(resultdbt.get_data(), 0, resultdbt.get_size());
System.out.println("got data: " + result);
}
db.close(0);
System.out.println("finished test");
}
catch (DbException dbe) {
System.err.println("Db Exception: " + dbe);
}
catch (FileNotFoundException fnfe) {
System.err.println("FileNotFoundException: " + fnfe);
}
}
}
|
