Module schema_cache 

Schema Cache module

The schema cache is the heart of dbrest. It introspects the PostgreSQL database and caches:

• Tables/Views metadata
• Column information
• Foreign key relationships
• Functions/Procedures

Architecture

The cache is immutable and wrapped in ArcSwap for lock-free reads and atomic replacement during schema reload.

┌─────────────────────────────────────────────────┐
│                  SchemaCache                     │
├─────────────────────────────────────────────────┤
│  tables: HashMap<QualifiedIdentifier, Table>    │
│  relationships: HashMap<..., Vec<Relationship>> │
│  routines: HashMap<QualifiedIdentifier, Vec>    │
│  timezones: HashSet<String>                     │
└─────────────────────────────────────────────────┘

Re-exports

pub use db::ComputedFieldRow;

pub use db::DbIntrospector;

pub use db::RelationshipRow;

pub use db::RoutineRow;

pub use db::TableRow;

pub use media_handler::MediaHandler;

pub use media_handler::MediaHandlerMap;

pub use media_handler::ResolvedHandler;

pub use relationship::AnyRelationship;

pub use relationship::Cardinality;

pub use relationship::ComputedRelationship;

pub use relationship::Junction;

pub use relationship::Relationship;

pub use representations::DataRepresentation;

pub use representations::RepresentationsMap;

pub use routine::PgType;

pub use routine::ReturnType;

pub use routine::Routine;

pub use routine::RoutineParam;

pub use routine::Volatility;

pub use table::Column;

pub use table::ComputedField;

pub use table::Table;

Modules

db

Database introspection trait

media_handler

Media handler types for dbrest content negotiation

queries

Database introspection queries

relationship

Relationship types for schema cache

representations

Data representation types for dbrest

routine

Routine (function/procedure) types for schema cache

table

Table and Column types for schema cache

Structs

SchemaCache

Immutable schema cache

SchemaCacheHolder

Schema cache holder with atomic swap capability

Type Aliases

RelationshipsMap

Type alias for the relationships map Key: (source_table, schema) -> list of relationships from that table

RoutinesMap

Type alias for the routines map Key: QualifiedIdentifier -> list of overloaded functions

TablesMap

Type alias for the tables map