metadata_lookup.rs - source

Files

aho_corasick

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bigdecimal

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format

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offset

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sys

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diesel

associations

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connection

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expression

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macros

internal.rs mod.rs ops.rs query_id.rs static_cond.rs tuples.rs

migration

errors.rs mod.rs

mysql

connection

stmt

iterator.rs metadata.rs mod.rs

bind.rs mod.rs raw.rs url.rs

query_builder

mod.rs query_fragment_impls.rs

types

date_and_time.rs mod.rs numeric.rs

backend.rs bind_collector.rs mod.rs

pg

connection

stmt

cursor.rs mod.rs raw.rs result.rs row.rs

expression

extensions

interval_dsl.rs mod.rs

array.rs array_comparison.rs date_and_time.rs expression_methods.rs helper_types.rs mod.rs operators.rs

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serialize

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types

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floats

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upsert

mod.rs on_conflict_actions.rs on_conflict_clause.rs on_conflict_extension.rs on_conflict_target.rs

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query_builder

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insert_statement

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select_statement

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chrono.rs mod.rs

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type_impls

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types

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as_changeset.rs as_expression.rs associations.rs diagnostic_shim.rs diesel_numeric_ops.rs field.rs from_sql_row.rs identifiable.rs insertable.rs lib.rs meta.rs model.rs query_id.rs queryable.rs queryable_by_name.rs resolved_at_shim.rs sql_type.rs util.rs

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log

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matches

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embed_migrations.rs lib.rs migrations.rs util.rs

mysqlclient_sys

bindings_macos.rs lib.rs

num_bigint

algorithms.rs bigint.rs biguint.rs lib.rs macros.rs monty.rs

num_integer

average.rs lib.rs roots.rs

num_traits

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parking_lot

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quickcheck

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quote

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r2d2

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regex

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ryu

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smallvec

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time

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tinyvec

array

generated_impl.rs

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tinyvec_macros

unicode_bidi

char_data

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deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs no_std_prelude.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs replace.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

encoding.rs form_urlencoded.rs host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

utf8_ranges

char_utf8.rs lib.rs

uuid

adapter

builder

error.rs mod.rs

parser

error.rs mod.rs

error.rs lib.rs prelude.rs

winapi

use super::{PgConnection, PgTypeMetadata};
use prelude::*;

/// Determines the OID of types at runtime
#[allow(missing_debug_implementations)]
#[repr(transparent)]
pub struct PgMetadataLookup {
    conn: PgConnection,
}

impl PgMetadataLookup {
    #[allow(clippy::new_ret_no_self)]
    pub(crate) fn new(conn: &PgConnection) -> &Self {
        unsafe { &*(conn as *const PgConnection as *const PgMetadataLookup) }
    }

    /// Determine the type metadata for the given `type_name`
    ///
    /// This function should only be used for user defined types, or types which
    /// come from an extension. This function may perform a SQL query to look
    /// up the type. For built-in types, a static OID should be preferred.
    pub fn lookup_type(&self, type_name: &str) -> PgTypeMetadata {
        use self::pg_type::dsl::*;

        pg_type
            .select((oid, typarray))
            .filter(typname.eq(type_name))
            .first(&self.conn)
            .unwrap_or_default()
    }
}

table! {
    pg_type (oid) {
        oid -> Oid,
        typname -> Text,
        typarray -> Oid,
    }
}