Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating an object graph from records of a relational database. One of the methods includes receiving a request to populate a software object with values from a plurality of tables represented in a graph, the plurality of tables stored in a relational database maintained by a database management system, each table comprising one or more respective tuples of values; generating a single query statement that, when executed by the database management system, causes the database management system to retrieve the values from the plurality of tables represented in the graph as a result set; querying the relational database using the single query statement to obtain the result set; and populating the software object with one or more values of the result set.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating an object graph from records of a relational database. One of the methods includes receiving a request to populate a software object with values from a plurality of tables represented in a graph, the plurality of tables stored in a relational database maintained by a database management system, each table comprising one or more respective tuples of values; generating a single query statement that, when executed by the database management system, causes the database management system to retrieve the values from the plurality of tables represented in the graph as a result set; querying the relational database using the single query statement to obtain the result set; and populating the software object with one or more values of the result set.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for enforcing a mapping between entities in a database and aggregates in an application framework. One of the methods includes receiving a request to populate a program object corresponding to an entity in a first relation of a relational database, the relational database is queried to obtain values for one or more attributes of the entity in the first relation and a plurality of identifiers that each identify a respective entity in the second relation of the relational database. The program object is populated with an aggregate having a complete collection of identifiers representing an m-to-n relationship in the database.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for enforcing a mapping between entities in a database and aggregates in an application framework. One of the methods includes maintaining a mapping between entities represented in a relational database and respective corresponding objects in a program being executed by an application framework, wherein the relational database includes one or more relations defining an m-to-n mapping relationship between entities in a first relation of the relational database and respective entities in a second relation of the relational database. In response to receiving a request to populate a program object corresponding to an entity in the first relation of the relational database, the relational database is queried to obtain values for one or more attributes of the entity in the first relation and a plurality of identifiers that each identify a respective entity in the second relation of the relational database.