Mapper Configuration

This section describes a variety of configurational patterns that are usable with mappers. It assumes you’ve worked through Object Relational Tutorial and know how to construct and use rudimentary mappers and relationships.

• Types of Mappings
  • Declarative Mapping
  • Classical Mappings
  • Runtime Introspection of Mappings, Objects
• Mapping Columns and Expressions
  • Mapping Table Columns
  • SQL Expressions as Mapped Attributes
  • Changing Attribute Behavior
  • Composite Column Types
• Mapping Class Inheritance Hierarchies
  • Joined Table Inheritance
  • Single Table Inheritance
  • Concrete Table Inheritance
• Non-Traditional Mappings
  • Mapping a Class against Multiple Tables
  • Mapping a Class against Arbitrary Selects
  • Multiple Mappers for One Class
• Configuring a Version Counter
  • Simple Version Counting
  • Custom Version Counters / Types
  • Server Side Version Counters
  • Programmatic or Conditional Version Counters
• Class Mapping API
  • mapper()
  • object_mapper()
  • class_mapper()
  • configure_mappers()
  • clear_mappers()
  • identity_key()
  • polymorphic_union()
  • Mapper