storages::postgres::io::Codegen Struct Reference

#include <userver/storages/postgres/io/enum_types.hpp>

Detailed Description

Helper for enumerators that use Parse and ToString functions for conversions, mostly for autogenerated enums from chaotic.

A generated enum:

// Autogenerated enum with formatters and parsers
enum class GeneratedRainbow { kRed, kOrange, kYellow, kGreen, kCyan };
 
GeneratedRainbow Parse(std::string_view value, formats::parse::To<GeneratedRainbow>);
std::string ToString(GeneratedRainbow value);

can be registered in the following way

template <>
struct storages::postgres::io::CppToUserPg<GeneratedRainbow> : EnumMappingBase<GeneratedRainbow> {
    static constexpr DBTypeName postgres_name = "__pgtest.rainbow";
    static constexpr auto enumerators = storages::postgres::io::Codegen{};
};

After that the enum is mapped to the PostgreSQL type that can be created in the following way:

CREATE TYPE __pgtest.rainbow AS enum (
  'red', 'orange', 'yellow', 'green', 'cyan'
)

Use it as usual:

    auto res = GetConn()->Execute("select 'red'::__pgtest.rainbow");
    EXPECT_EQ(res[0][0].As<GeneratedRainbow>(), GeneratedRainbow::kRed);
 
    res = GetConn()->Execute("select $1", GeneratedRainbow::kYellow);
    EXPECT_EQ(res[0][0].As<GeneratedRainbow>(), GeneratedRainbow::kYellow);

Definition at line 70 of file enum_types.hpp.

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The documentation for this struct was generated from the following file:

• userver/storages/postgres/io/enum_types.hpp