1.4. JDO positioning
Before we move on to discuss a simple JDO example, I present in Table 1.1 a brief comparison of the persistence mechanisms discussed above. This is intended to help position JDO with respect to alternative persistence APIs. The superscripts1 through4 refer to notes that appear beneath the table.
| Serialization | JDBC | ODBMS | EJB | JDO | |
|---|---|---|---|---|---|
| Transactional | ✗ | ✓ | ✓ | ✓ | ✓ |
| Query facility | ✗ | ✓ | ✓ | ✓ | ✓ |
| Standard API | ✓ java.io | ✓ JDBC | ✗ ODMG1 | ✓ EJB | ✓ JDO |
| Standard query language | ✗ | ✗ SQL2 | ✗ OQL | ✓ EJBQL | ✓ JDOQL |
| Supported data store paradigm | File system | RDBMS | ODBMS | RDBMS, EAI, | RDBMS, ODBMS, EAI File system, others |
| Transparent to closure of persistent instances | ✗ | ✗ | ✓ | ✗ | ✓ |
| Transparent to domain model | ✗ | ✗ | ✓ |
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