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Pony ORM v0.7.14 Documentation
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Working with entity instances

 来源:ponyorm 浏览 297 扫码 分享 2021-09-08 23:17:31
  • Working with entity instances

    Working with entity instances

    • Creating an entity instance
    • Loading objects from the database
    • Updating an object
    • Deleting an object
    • Saving objects in the database
    • Entity methods
    • Entity hooks
    • Serializing entity instances using pickle
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    • What is Pony ORM?
    • Getting Started with Pony
      • Installing
      • Creating the database object
      • Defining entities
      • Database binding
      • Mapping entities to database tables
      • Using the debug mode
      • Creating entity instances
      • db_session
      • Writing queries
      • Getting objects
      • Updating an object
      • Writing raw SQL queries
      • Pony examples
    • Connecting to the Database
      • Creating the Database object
      • Defining entities which are related to the Database object
      • Binding the database object to a specific database
      • Mapping entities to the database tables
      • Methods and attributes of the Database object
      • Using Database object for raw SQL queries
      • Customizing connection behavior
      • Database statistics
    • Declaring Entities
      • Declaring an entity
      • Entity attributes
      • Attribute data types
      • Attribute options
      • Entity inheritance
      • Adding custom methods to entities
      • Mapping customization
      • Hybrid methods and properties
    • Entity Relationships
      • One-to-many relationship
      • Many-to-many relationship
      • One-to-one relationship
      • Self-references
      • Multiple relationships between two entities
    • Transactions and db_session
      • Working with db_session
      • Working with multiple databases
      • Functions for working with transactions
      • Optimistic concurrency control
      • Pessimistic locking
      • How Pony avoids lost updates
      • Transaction isolation levels and database peculiarities
      • Handling disruptions
    • Working with entity instances
      • Creating an entity instance
      • Loading objects from the database
      • Updating an object
      • Deleting an object
      • Saving objects in the database
      • Entity methods
      • Entity hooks
      • Serializing entity instances using pickle
    • Queries
      • Using Python generator expressions
      • Using lambda functions
      • Pony ORM functions used to query the database
      • Pony query examples
      • Query object methods
      • Using date and time in queries
      • Automatic DISTINCT
      • Functions which can be used inside a query
      • Using raw SQL
    • Working with entity relationships
      • Establishing a relationship
      • Operations with collections
    • Aggregation
      • Query object aggregate functions
      • Several aggregate functions in one query
      • Function count
      • Conditional count
      • More sophisticated aggregate queries
      • Queries with HAVING
      • Aggregate functions in order by section
    • JSON Data Type Support
      • Overview
      • Declaring a JSON attribute
      • Assigning value to the JSON attribute
      • Reading JSON attribute
      • Modifying JSON attribute
      • Querying JSON structures
      • JSON Support in Databases
    • Array Data Type Support
      • Overview
      • Declaring an Array attribute
      • Operations with arrays
    • API Reference
      • Database
      • Supported databases
      • Transactions & db_session
      • Entity definition
      • Entity methods
      • Queries and functions
      • Query object
      • Statistics - QueryStat
    • Integration with flask
    • Integration with FastAPI
      • Setup
      • Models and Schemas
      • Async and db_session
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