SQLAlchemy 2.0 Documentation
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Events and Internals

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    Events and Internals

    • ORM Events
      • Mapper Events
      • Attribute Events
      • Instrumentation Events
      • AttributeState
      • ClassManager
      • Composite
      • AttributeEventToken
      • InspectionAttrInfo
      • InstrumentedAttribute
      • Mapped
      • MapperProperty
      • InspectionAttrExtensionType
      • merge_result()
      • PropComparator
      • RelationshipDirection
      • Synonym
      • QueryContext
      • UOWTransaction
      • ConcurrentModificationError
      • FlushError
      • NO_STATE
      • ObjectDereferencedError
      • UnmappedClassError
      • UnmappedInstanceError
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    • Dialects
      • SQLite
      • Microsoft SQL Server
      • PostgreSQL
      • MySQL and MariaDB
      • Oracle
    • SQLAlchemy Unified Tutorial
      • Working with Database Metadata
      • Working with Transactions and the DBAPI
      • Working with Data
        • Using SELECT Statements
        • Using UPDATE and DELETE Statements
        • Using INSERT Statements
      • Further Reading
      • Establishing Connectivity - the Engine
      • Data Manipulation with the ORM
      • Working with Related Objects
    • Error Messages
    • SQLAlchemy ORM
      • ORM Quick Start
      • Relationship Configuration
        • Collection Customization and API Details
        • Basic Relationship Patterns
        • Working with Large Collections
        • Special Relationship Persistence Patterns
        • Using the legacy ‘backref’ relationship parameter
        • Configuring how Relationship Joins
        • Adjacency List Relationships
        • Relationships API
      • ORM Querying Guide
        • Relationship Loading Techniques
        • Column Loading Options
        • Legacy Query API
        • ORM API Features for Querying
        • ORM-Enabled INSERT, UPDATE, and DELETE statements
        • Writing SELECT statements for Inheritance Mappings
        • Writing SELECT statements for ORM Mapped Classes
      • ORM Examples
      • Using the Session
        • Contextual/Thread-local Sessions
        • Additional Persistence Techniques
        • State Management
        • Session API
        • Tracking queries, object and Session Changes with Events
        • Transactions and Connection Management
        • Session Basics
        • Cascades
      • Events and Internals
        • ORM Internals
        • ORM Exceptions
        • ORM Events
      • ORM Mapped Class Configuration
        • Integration with dataclasses and attrs
        • Composite Column Types
        • Non-Traditional Mappings
        • Class Mapping API
        • Mapping Class Inheritance Hierarchies
        • Changing Attribute Behavior
        • ORM Mapped Class Overview
        • Mapping SQL Expressions
          • Mapping Table Columns
        • SQL Expressions as Mapped Attributes
        • Configuring a Version Counter
        • Mapping Classes with Declarative
          • Table Configuration with Declarative
          • Declarative Mapping Styles
          • Mapper Configuration with Declarative
          • Composing Mapped Hierarchies with Mixins
      • ORM Extensions
        • Indexable
        • Baked Queries
        • Alternate Class Instrumentation
        • Asynchronous I/O (asyncio)
        • Horizontal Sharding
        • Ordering List
        • Mypy / Pep-484 Support for ORM Mappings
        • Association Proxy
        • Declarative Extensions
        • Automap
        • Mutation Tracking
        • Hybrid Attributes
    • SQLAlchemy Core
      • Core API Basics
        • Events
        • Core Exceptions
        • Core Internals
        • Runtime Inspection API
      • SQL Datatype Objects
        • Base Type API
        • The Type Hierarchy
        • Custom Types
      • Schema Definition Language
        • Reflecting Database Objects
        • Column INSERT/UPDATE Defaults
        • Defining Constraints and Indexes
        • Describing Databases with MetaData
        • Customizing DDL
      • Engine and Connection Use
        • Core Events
        • Working with Engines and Connections
        • Engine Configuration
        • Connection Pooling
      • SQL Statements and Expressions API
        • Visitor and Traversal Utilities
        • Insert, Updates, Deletes
        • SQL and Generic Functions
        • Expression Serializer Extension
        • SQL Expression Language Foundational Constructs
        • SELECT and Related Constructs
        • Custom SQL Constructs and Compilation Extension
        • Operator Reference
        • Column Elements and Expressions
    • Changes and Migration
      • 0.5 Changelog
      • What’s New in SQLAlchemy 0.9?
      • 1.3 Changelog
      • 1.2 Changelog
      • 0.7 Changelog
      • What’s New in SQLAlchemy 0.7?
      • 0.4 Changelog
      • 1.4 Changelog
      • What’s New in SQLAlchemy 1.2?
      • 1.1 Changelog
      • What’s New in SQLAlchemy 1.4?
      • 0.9 Changelog
      • SQLAlchemy 2.0 - Major Migration Guide
      • What’s New in SQLAlchemy 2.0?
      • What’s New in SQLAlchemy 0.8?
      • 0.2 Changelog
      • 0.8 Changelog
      • What’s new in SQLAlchemy 0.5?
      • 2.0 Changelog
      • 0.1 Changelog
      • 0.3 Changelog
      • 1.0 Changelog
      • 0.6 Changelog
      • What’s New in SQLAlchemy 0.6?
      • What’s New in SQLAlchemy 1.1?
      • What’s New in SQLAlchemy 1.0?
      • What’s new in SQLAlchemy 0.4?
      • What’s New in SQLAlchemy 1.3?
    • Frequently Asked Questions
      • Sessions / Queries
      • ORM Configuration
      • Installation
      • Connections / Engines
      • Performance
      • Third Party Integration Issues
      • MetaData / Schema
      • SQL Expressions
    • Overview
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