Module pg

Available on crate feature postgres_backend only.

Provides types and functions related to working with PostgreSQL

Much of this module is re-exported from database agnostic locations. However, if you are writing code specifically to extend Diesel on PostgreSQL, you may need to work with this module directly.

Modules

data_types

Data structures for PG types which have no corresponding Rust type

expression

PostgreSQL related query builder extensions

sql_types

PostgreSQL specific SQL types

Structs

CopyFromQuery

The structure returned by copy_from

CopyToQuery

The structure returned by copy_to

DistinctOnClause

Represents DISTINCT ON (...)

FailedToLookupTypeErrori-implement-a-third-party-backend-and-opt-into-breaking-changes

This error indicates that a type lookup for a custom postgres type failed

Pg

The PostgreSQL backend

PgConnectionpostgres

The connection string expected by PgConnection::establish should be a PostgreSQL connection string, as documented at https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNSTRING

PgMetadataCachei-implement-a-third-party-backend-and-opt-into-breaking-changes

Cache for the OIDs of custom Postgres types

PgMetadataCacheKeyi-implement-a-third-party-backend-and-opt-into-breaking-changes

The key used to lookup cached type oid’s inside of a PgMetadataCache.

PgNotification

See Postgres documentation for SQL Commands NOTIFY and LISTEN

PgQueryBuilder

The PostgreSQL query builder

PgRowByRowLoadingModepostgres

A PgConnection specific loading mode to load rows one by one

PgTypeMetadata

The OIDs for a SQL type

PgValue

Raw postgres value as received from the database

TransactionBuilder

Used to build a transaction, specifying additional details.

Enums

CopyFormat

Describes the format used by COPY FROM or COPY TO statements

CopyHeader

Describes the different possible settings for the HEADER option for COPY FROM statements

Traits

CopyTarget

A expression that could be used as target/source for COPY FROM and COPY TO commands

GetPgMetadataCachei-implement-a-third-party-backend-and-opt-into-breaking-changes

Gets the PgMetadataCache for a Connection<Backend=Pg> so that the lookup of user defined types, or types which come from an extension can be cached.

OrderDecorator

A decorator trait for OrderClause It helps to have bounds on either Col, Asc and Desc.

PgMetadataLookup

Determines the OID of types at runtime

TypeOidLookupi-implement-a-third-party-backend-and-opt-into-breaking-changes

This is a helper trait to defer a type oid lookup to a later point in time