Apache MetaModel is a library that encapsulates the differences and enhances the capabilities of different datastores. Rich querying abilities are offered to datastores that do not otherwise support advanced querying and a unified view of the datastore structure is offered through a single model of the schemas, tables, columns and relationships.
Key concepts:
- DataContext
- Query object, the QueryBuilder API and Query parsing
- UpdateableDataContext
- UpdateScript (and BatchUpdateScript)
Knowledge base and background information:
Details about Connectors / DataContext implementations:
| Datastore type | DataContext class name | Variants supported/available |
| JdbcDataContext | PostgreSQL, MySQL, Microsoft SQL Server, Oracle DB, IBM DB2 | |
| CsvDataContext | Comma-separated | |
| Fixed width value files | FixedWidthDataContext | Fixed width |
| Microsoft Excel spreadsheets | ExcelDataContext | .xls |
| Microsoft Access database files | AccessDataContext | .mdb |
| OpenOffice.org database files | OpenOfficeDataContext | .odb |
| XML files | XmlDomDataContext XmlSaxDataContext | DOM-based parsing (all in-memory) |
| JSON files | JsonDataContext | |
| ElasticSearch | ElasticSearchDataContext | Native Java API |
| MongoDB | MongoDbDataContext | MongoDB 2.x MongoDB 3.x |
| Apache CouchDB | CouchDbDataContext | |
| Apache Cassandra | CassandraDataContext | |
| Apache HBase | HBaseDataContext | |
| Neo4j | Neo4jDataContext | |
| Salesforce.com | SalesforceDataContext | |
| SugarCRM | SugarCrmDataContext | |
| Java collections | PojoDataContext |
|
| Collections of other datastores | CompositeDataContext |
Additional information for the interested:
Blogs and presentations - external readings, presentations, videos etc. about Apache MetaModel
Data type conversion
MetaModel extras - third party modules built on top of Apache MetaModel
Migrating from (legacy) eobjects.org MetaModel to Apache MetaModel
- Release Guide