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.
• 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