SQLAlchemy 1.4 Documentation
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Mapping Columns and Expressions

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    Mapping Columns and Expressions

    • Mapping Table Columns
      • Automating Column Naming Schemes from Reflected Tables
      • Using column_property for column level options
    • Changing Attribute Behavior
      • Using Descriptors and Hybrids
      • Operator Customization
      • Tracking In-Place Mutations on Composites
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    • SQLAlchemy ORM
      • Querying Data, Loading Objects
        • ORM Querying Guide
        • Query API
        • Loading Inheritance Hierarchies
        • Relationship Loading Techniques
        • Loading Columns
        • Constructors and Object Initialization
      • Mapper Configuration
        • Class Mapping API
        • Configuring a Version Counter
        • Non-Traditional Mappings
        • Mapping Classes with Declarative
          • Table Configuration with Declarative
          • Composing Mapped Hierarchies with Mixins
          • Mapper Configuration with Declarative
        • Mapping Columns and Expressions
          • Composite Column Types
          • Mapping Table Columns
          • SQL Expressions as Mapped Attributes
          • Changing Attribute Behavior
        • Mapping Class Inheritance Hierarchies
        • Mapping Python Classes
      • ORM Examples
        • directed_graph.py
        • materialized_paths.py
        • space_invaders.py
        • postgis.py
        • dynamic_dict.py
        • adjacency_list.py
        • nested_sets.py
        • large_collection.py
      • Using the Session
        • Tracking queries, object and Session Changes with Events
        • Session Basics
        • Session API
        • Additional Persistence Techniques
        • Contextual/Thread-local Sessions
        • Transactions and Connection Management
        • State Management
        • Cascades
      • ORM Extensions
        • Mutation Tracking
        • Indexable
        • Association Proxy
        • Baked Queries
        • Horizontal Sharding
        • Asynchronous I/O (asyncio)
        • Declarative Extensions
          • Basic Use
          • Table Configuration
          • Configuring Relationships
          • Declarative API
          • Declarative Inheritance
          • Mixin and Custom Base Classes
        • Ordering List
        • Mypy / Pep-484 Support for ORM Mappings
        • Alternate Class Instrumentation
        • Automap
        • Hybrid Attributes
      • Events and Internals
        • ORM Exceptions
        • ORM Internals
        • ORM Events
      • Object Relational Tutorial (1.x API)
      • Relationship Configuration
        • Basic Relationship Patterns
        • Adjacency List Relationships
        • Collection Configuration and Techniques
        • Relationships API
        • Special Relationship Persistence Patterns
        • Linking Relationships with Backref
        • Configuring how Relationship Joins
    • SQLAlchemy 1.4 / 2.0 Tutorial
      • Establishing Connectivity - the Engine
      • Further Reading
      • Working with Transactions and the DBAPI
      • Data Manipulation with the ORM
      • Working with Database Metadata
      • Working with Related Objects
      • Working with Data
    • Overview
    • Glossary
    • Error Messages
    • Frequently Asked Questions
      • MetaData / Schema
      • SQL Expressions
      • Sessions / Queries
      • ORM Configuration
      • Third Party Integration Issues
      • Connections / Engines
      • Performance
    • Changes and Migration
      • What’s New in SQLAlchemy 0.6?
      • 0.6 Changelog
      • 1.4 Changelog
      • 1.2 Changelog
      • 0.7 Changelog
      • What’s New in SQLAlchemy 0.9?
      • 0.2 Changelog
      • What’s New in SQLAlchemy 1.1?
      • What’s new in SQLAlchemy 0.5?
      • 1.1 Changelog
      • What’s new in SQLAlchemy 0.4?
      • 0.5 Changelog
      • What’s New in SQLAlchemy 0.8?
      • 0.9 Changelog
      • What’s New in SQLAlchemy 1.0?
      • 0.4 Changelog
      • What’s New in SQLAlchemy 1.3?
      • 0.3 Changelog
      • 1.0 Changelog
      • 0.1 Changelog
      • What’s New in SQLAlchemy 1.4?
      • Migrating to SQLAlchemy 2.0
      • What’s New in SQLAlchemy 1.2?
      • 0.8 Changelog
      • What’s New in SQLAlchemy 0.7?
      • 1.3 Changelog
    • Dialects
      • Oracle
      • MySQL and MariaDB
      • Sybase
      • Firebird
      • SQLite
      • PostgreSQL
      • Microsoft SQL Server
    • SQLAlchemy Core
      • Engine and Connection Use
        • Engine Configuration
        • Working with Engines and Connections
        • Core Events
        • Connection Pooling
      • Schema Definition Language
        • Column INSERT/UPDATE Defaults
        • Customizing DDL
        • Describing Databases with MetaData
        • Reflecting Database Objects
        • Defining Constraints and Indexes
      • SQL Expression Language Tutorial (1.x API)
      • Core API Basics
        • Core Internals
        • Core Exceptions
        • Events
        • Runtime Inspection API
      • SQLAlchemy 2.0 Future (Core)
      • SQL Statements and Expressions API
        • Expression Serializer Extension
        • Visitor and Traversal Utilities
        • Insert, Updates, Deletes
        • Operator Reference
        • Custom SQL Constructs and Compilation Extension
        • SQL and Generic Functions
        • Column Elements and Expressions
        • Selectables, Tables, FROM objects
      • Column and Data Types
        • Base Type API
        • Column and Data Types
        • Custom Types
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