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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Adding Database Items</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
<link rel="start" href="index.html" title="Berkeley DB Collections Tutorial" />
<link rel="up" href="BasicProgram.html" title="Chapter 2. The Basic Program" />
<link rel="prev" href="usingtransactions.html" title="Using Transactions" />
<link rel="next" href="retrievingdatabaseitems.html" title="Retrieving Database Items" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.3</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">
Adding Database Items
</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="usingtransactions.html">Prev</a> </td>
<th width="60%" align="center">Chapter 2.
The Basic Program
</th>
<td width="20%" align="right"> <a accesskey="n" href="retrievingdatabaseitems.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="addingdatabaseitems"></a>
Adding Database Items
</h2>
</div>
</div>
</div>
<p>
Adding (as well as updating, removing, and deleting) information
in the database is accomplished via the standard Java collections
API. In the example, the
<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html#put(K, V)" target="_top">Map.put</a>
method is used to add objects. All standard Java methods for
modifying a collection may be used with the DB Java Collections API.
</p>
<p>
The <code class="methodname">PopulateDatabase.doWork()</code> method calls private methods
for adding objects to each of the three database stores. It is
called via the
<a class="ulink" href="../../java/com/sleepycat/collections/TransactionRunner.html" target="_top">TransactionRunner</a>
class and was outlined in the previous section.
</p>
<a id="cb_populatedatabase"></a>
<pre class="programlisting">import java.util.Map;
import com.sleepycat.collections.TransactionWorker;
...
public class Sample
{
...
private SampleViews views;
...
private class PopulateDatabase implements TransactionWorker
{
public void doWork()
throws Exception
{
<strong class="userinput"><code> addSuppliers();
addParts();
addShipments();</code></strong>
}
}
...
<strong class="userinput"><code> private void addSuppliers()
{
}
private void addParts()
{
}
private void addShipments()
{
}</code></strong>
} </pre>
<p>
The <code class="methodname">addSuppliers()</code>, <code class="methodname">addParts()</code> and <code class="methodname">addShipments()</code>
methods add objects to the Suppliers, Parts and Shipments stores.
The
<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html" target="_top">Map</a>
for each store is obtained from the <code class="classname">SampleViews</code> object.
</p>
<a id="cb_addsuppliers"></a>
<pre class="programlisting"> private void addSuppliers()
{
<strong class="userinput"><code> Map suppliers = views.getSupplierMap();
if (suppliers.isEmpty())
{
System.out.println("Adding Suppliers");
suppliers.put(new SupplierKey("S1"),
new SupplierData("Smith", 20, "London"));
suppliers.put(new SupplierKey("S2"),
new SupplierData("Jones", 10, "Paris"));
suppliers.put(new SupplierKey("S3"),
new SupplierData("Blake", 30, "Paris"));
suppliers.put(new SupplierKey("S4"),
new SupplierData("Clark", 20, "London"));
suppliers.put(new SupplierKey("S5"),
new SupplierData("Adams", 30, "Athens"));
}</code></strong>
}
private void addParts()
{
<strong class="userinput"><code> Map parts = views.getPartMap();
if (parts.isEmpty())
{
System.out.println("Adding Parts");
parts.put(new PartKey("P1"),
new PartData("Nut", "Red",
new Weight(12.0, Weight.GRAMS),
"London"));
parts.put(new PartKey("P2"),
new PartData("Bolt", "Green",
new Weight(17.0, Weight.GRAMS),
"Paris"));
parts.put(new PartKey("P3"),
new PartData("Screw", "Blue",
new Weight(17.0, Weight.GRAMS),
"Rome"));
parts.put(new PartKey("P4"),
new PartData("Screw", "Red",
new Weight(14.0, Weight.GRAMS),
"London"));
parts.put(new PartKey("P5"),
new PartData("Cam", "Blue",
new Weight(12.0, Weight.GRAMS),
"Paris"));
parts.put(new PartKey("P6"),
new PartData("Cog", "Red",
new Weight(19.0, Weight.GRAMS),
"London"));
}</code></strong>
}
private void addShipments()
{
<strong class="userinput"><code> Map shipments = views.getShipmentMap();
if (shipments.isEmpty())
{
System.out.println("Adding Shipments");
shipments.put(new ShipmentKey("P1", "S1"),
new ShipmentData(300));
shipments.put(new ShipmentKey("P2", "S1"),
new ShipmentData(200));
shipments.put(new ShipmentKey("P3", "S1"),
new ShipmentData(400));
shipments.put(new ShipmentKey("P4", "S1"),
new ShipmentData(200));
shipments.put(new ShipmentKey("P5", "S1"),
new ShipmentData(100));
shipments.put(new ShipmentKey("P6", "S1"),
new ShipmentData(100));
shipments.put(new ShipmentKey("P1", "S2"),
new ShipmentData(300));
shipments.put(new ShipmentKey("P2", "S2"),
new ShipmentData(400));
shipments.put(new ShipmentKey("P2", "S3"),
new ShipmentData(200));
shipments.put(new ShipmentKey("P2", "S4"),
new ShipmentData(200));
shipments.put(new ShipmentKey("P4", "S4"),
new ShipmentData(300));
shipments.put(new ShipmentKey("P5", "S4"),
new ShipmentData(400));
}</code></strong>
}
}</pre>
<p>
The key and value classes used above were defined in the
<a class="xref" href="BasicProgram.html#keyandvalueclasses" title="Defining Serialized Key and Value Classes">
Defining Serialized Key and Value Classes
</a>.
</p>
<p>
In each method above, objects are added only if the map is not
empty. This is a simple way of allowing the example program to be
run repeatedly. In real-life applications another technique —
checking the
<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html#containsKey(java.lang.Object)" target="_top">Map.containsKey</a>
method, for example — might be used.
</p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="usingtransactions.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="BasicProgram.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="retrievingdatabaseitems.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">
Using Transactions
</td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top">
Retrieving Database Items
</td>
</tr>
</table>
</div>
</body>
</html>
|
