Apache
Looking for the changelog? Check out our CHANGES.md file.
Source: Latest source code release of MetaModel:
Binary: A convenient package with all MetaModel modules and dependencies as JAR binaries:
Apache MetaModel is also distributed through the central Maven repository. Here's your typical <dependency> declaration:
<dependency> <groupId>org.apache.metamodel</groupId> <artifactId>MetaModel-full</artifactId> <version>5.3.3</version> </dependency>
The source code for Apache MetaModel is available through this Apache Git repository:
To get involved with Apache MetaModel, start by joining our mailing lists and engage in the conversations!
Please refer to our CONTRIBUTE.md file for details on contributing to Apache MetaModel.
Issues for Apache MetaModel are tracked through this Apache JIRA system:
With MetaModel you use a type-safe SQL-like API for querying any datastore:
DataContext dataContext = DataContextFactory.create[TypeOfDatastore](...);
DataSet dataSet = dataContext.query()
.from("libraries")
.select("name")
.where("language").eq("Java")
.and("enhances_data_access").eq(true)
.execute();
The MetaModel query API allows you to use the power of SQL, even on data formats such as CSV files, Excel spreadsheets, NoSQL databases and more.
MetaModel lets you do CRUD operations on arbitrary datamodels, also in a type-safe manner. Batch updates and transactions are logically modelled as UpdateScript closures.
dataContext.executeUpdate(new UpdateScript() {
public void run(UpdateCallback callback) {
// CREATE a table
Table table = callback.createTable("contributors")
.withColumn("id").ofType(INTEGER)
.withColumn("name").ofType(VARCHAR).execute();
// INSERT INTO table
callback.insertInto(table)
.value("id", 1).value("name", "John Doe").execute();
callback.insertInto(table)
.value("name", "Jane D.").execute();
// UPDATE table
callback.update(table).value("name","Jane Doe")
.where("id").eq(2).execute();
// DELETE FROM table
callback.deleteFrom(table).where("id").eq(1).execute();
}
});
The rest of the API should reveal itself through using the DataContext! Javadocs, wiki, mailing lists and other resources help too of course, so check them out.
Check out the MetaModel wiki for more in-depth examples and documentation.
MetaModel was initially developed and released by Human Inference since 2011. In July 2013 MetaModel joined the Apache Incubator and in November 2014 MetaModel graduated to become a Top Level Project (TLP) of The Apache Foundation. It is licensed under the Apache 2.0 license.