![]() ![]() This chapter includes the following sections:įor information on mapping concepts and features common to more than one type of TopLink mappings, see Chapter 17, "Introduction to Mappings". You can only use object-relational data type mappings with specialized object-relational data type databases optimized to support object-relational data type data source representations. ![]() In general, you can use relational mappings with any supported relational database. Object-relational data type mappings let you map an object model into an object-relational data type data model. An object-relational data type mapping transforms certain object data member types to structured data source representations optimized for storage in specialized object-relational data type databases, such as Oracle Database. The appropriate mapping class is chosen primarily by the cardinality of the relationship.ĭo not confuse relational mappings with object-relational data type mappings (see Chapter 40, "Introduction to Object-Relational Data Type Mappings"). You can also use them to transform object data members that reference other domain objects by way of association where data source representations require object identity maintenance (such as sequencing and back references) and possess various types of multiplicity and navigability. ![]() Use them to map simple data types including primitives (such as int), JDK classes (such as String), and large object (LOB) values. Relational mappings transform object data members to relational database fields. Relational mappings let you map an object model into a relational data model. 45/158 27 Introduction to Relational MappingsĪ relational mapping transforms any object data member type to a corresponding relational database (SQL) data source representation in any supported relational database. ![]()
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