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1
8
9 package persist;
10
11 import java.io.File  ;
12 import java.util.HashSet ;
13 import java.util.Set ;
14
15 import com.sleepycat.je.DatabaseException;
16 import com.sleepycat.je.Environment;
17 import com.sleepycat.je.EnvironmentConfig;
18 import com.sleepycat.persist.EntityCursor;
19 import com.sleepycat.persist.EntityIndex;
20 import com.sleepycat.persist.EntityStore;
21 import com.sleepycat.persist.PrimaryIndex;
22 import com.sleepycat.persist.SecondaryIndex;
23 import com.sleepycat.persist.StoreConfig;
24 import com.sleepycat.persist.model.Entity;
25 import com.sleepycat.persist.model.Persistent;
26 import com.sleepycat.persist.model.PrimaryKey;
27 import com.sleepycat.persist.model.SecondaryKey;
28 import static com.sleepycat.persist.model.DeleteAction.NULLIFY;
29 import static com.sleepycat.persist.model.Relationship.ONE_TO_ONE;
30 import static com.sleepycat.persist.model.Relationship.ONE_TO_MANY;
31 import static com.sleepycat.persist.model.Relationship.MANY_TO_ONE;
32 import static com.sleepycat.persist.model.Relationship.MANY_TO_MANY;
33
34 public class PersonExample {
35
36
37 @Entity
38 static class Person {
39
40 @PrimaryKey
41 String ssn;
42
43 String name;
44 Address address;
45
46 @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Person.class)
47 String parentSsn;
48
49 @SecondaryKey(relate=ONE_TO_MANY)
50 Set <String > emailAddresses = new HashSet <String >();
51
52 @SecondaryKey(relate=MANY_TO_MANY,
53 relatedEntity=Employer.class,
54 onRelatedEntityDelete=NULLIFY)
55 Set <Long > employerIds = new HashSet <Long >();
56
57 Person(String name, String ssn, String parentSsn) {
58 this.name = name;
59 this.ssn = ssn;
60 this.parentSsn = parentSsn;
61 }
62
63 private Person() {} }
65
66
67 @Entity
68 static class Employer {
69
70 @PrimaryKey(sequence="ID")
71 long id;
72
73 @SecondaryKey(relate=ONE_TO_ONE)
74 String name;
75
76 Address address;
77
78 Employer(String name) {
79 this.name = name;
80 }
81
82 private Employer() {} }
84
85
86 @Persistent
87 static class Address {
88 String street;
89 String city;
90 String state;
91 int zipCode;
92 private Address() {} }
94
95
96 static class PersonAccessor {
97
98
99 PrimaryIndex<String ,Person> personBySsn;
100 SecondaryIndex<String ,String ,Person> personByParentSsn;
101 SecondaryIndex<String ,String ,Person> personByEmailAddresses;
102 SecondaryIndex<Long ,String ,Person> personByEmployerIds;
103
104
105 PrimaryIndex<Long ,Employer> employerById;
106 SecondaryIndex<String ,Long ,Employer> employerByName;
107
108
109 public PersonAccessor(EntityStore store)
110 throws DatabaseException {
111
112 personBySsn = store.getPrimaryIndex(
113 String .class, Person.class);
114
115 personByParentSsn = store.getSecondaryIndex(
116 personBySsn, String .class, "parentSsn");
117
118 personByEmailAddresses = store.getSecondaryIndex(
119 personBySsn, String .class, "emailAddresses");
120
121 personByEmployerIds = store.getSecondaryIndex(
122 personBySsn, Long .class, "employerIds");
123
124 employerById = store.getPrimaryIndex(
125 Long .class, Employer.class);
126
127 employerByName = store.getSecondaryIndex(
128 employerById, String .class, "name");
129 }
130 }
131
132 public static void main(String [] args)
133 throws DatabaseException {
134
135 if (args.length != 2 || !"-h".equals(args[0])) {
136 System.err.println
137 ("Usage: java " + PersonExample.class.getName() +
138 " -h <envHome>");
139 System.exit(2);
140 }
141 PersonExample example = new PersonExample(new File (args[1]));
142 example.run();
143 example.close();
144 }
145
146 private Environment env;
147 private EntityStore store;
148 private PersonAccessor dao;
149
150 private PersonExample(File envHome)
151 throws DatabaseException {
152
153
154 EnvironmentConfig envConfig = new EnvironmentConfig();
155 envConfig.setAllowCreate(true);
156 envConfig.setTransactional(true);
157 env = new Environment(envHome, envConfig);
158
159
160 StoreConfig storeConfig = new StoreConfig();
161 storeConfig.setAllowCreate(true);
162 storeConfig.setTransactional(true);
163 store = new EntityStore(env, "PersonStore", storeConfig);
164
165
166 dao = new PersonAccessor(store);
167 }
168
169 private void run()
170 throws DatabaseException {
171
172
177 dao.personBySsn.put
178 (new Person("Bob Smith", "111-11-1111", null));
179 dao.personBySsn.put
180 (new Person("Mary Smith", "333-33-3333", "111-11-1111"));
181 dao.personBySsn.put
182 (new Person("Jack Smith", "222-22-2222", "111-11-1111"));
183
184
185 EntityCursor<Person> children =
186 dao.personByParentSsn.subIndex("111-11-1111").entities();
187 try {
188 for (Person child : children) {
189 System.out.println(child.ssn + ' ' + child.name);
190 }
191 } finally {
192 children.close();
193 }
194
195
196 Person bob = dao.personBySsn.get("111-11-1111");
197 assert bob != null;
198
199
203 Employer gizmoInc = dao.employerByName.get("Gizmo Inc");
204 if (gizmoInc == null) {
205 gizmoInc = new Employer("Gizmo Inc");
206 dao.employerById.put(gizmoInc);
207 }
208 Employer gadgetInc = dao.employerByName.get("Gadget Inc");
209 if (gadgetInc == null) {
210 gadgetInc = new Employer("Gadget Inc");
211 dao.employerById.put(gadgetInc);
212 }
213
214
215 bob.employerIds.add(gizmoInc.id);
216 bob.employerIds.add(gadgetInc.id);
217 bob.emailAddresses.add("bob@bob.com");
218 bob.emailAddresses.add("bob@gmail.com");
219
220
221 dao.personBySsn.put(bob);
222
223
224 bob = dao.personByEmailAddresses.get("bob@bob.com");
225 assert bob != null;
226 bob = dao.personByEmailAddresses.get("bob@gmail.com");
227 assert bob != null;
228
229
230 EntityIndex<String ,Person> employees;
231 employees = dao.personByEmployerIds.subIndex(gizmoInc.id);
232 assert employees.contains("111-11-1111");
233 employees = dao.personByEmployerIds.subIndex(gadgetInc.id);
234 assert employees.contains("111-11-1111");
235
236
241 dao.employerById.delete(gizmoInc.id);
242 bob = dao.personBySsn.get("111-11-1111");
243 assert bob != null;
244 assert !bob.employerIds.contains(gizmoInc.id);
245 }
246
247 private void close()
248 throws DatabaseException {
249
250 store.close();
251 env.close();
252 }
253 }
254 |
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