Trait FromWireValue 

pub trait FromWireValue<'a>: Sized {
    // Required methods
    fn from_text(oid: Oid, bytes: &'a [u8]) -> Result<Self>;
    fn from_binary(oid: Oid, bytes: &'a [u8]) -> Result<Self>;

    // Provided method
    fn from_null() -> Result<Self> { ... }
}

Trait for decoding PostgreSQL values into Rust types.

This trait provides methods for decoding values from different formats:

• from_null() - Handle NULL values
• from_text() - Decode from text format (simple queries)
• from_binary() - Decode from binary format (extended queries)

The OID parameter allows implementations to check the PostgreSQL type and reject incompatible types with clear error messages.

Required Methods

fn from_text(oid: Oid, bytes: &'a [u8]) -> Result<Self>

Decode from text format bytes.

Text format is the default for simple queries. Values are UTF-8 encoded string representations.

fn from_binary(oid: Oid, bytes: &'a [u8]) -> Result<Self>

Decode from binary format bytes.

Binary format uses PostgreSQL’s internal representation. Integers are big-endian, floats are IEEE 754, etc.

Provided Methods

fn from_null() -> Result<Self>

Decode from NULL value.

Default implementation returns an error. Override for types that can represent NULL (like Option<T>).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FromWireValue<'_> for bool

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for f32

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for f64

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for i16

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for i32

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for i64

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for String

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl FromWireValue<'_> for Vec<u8>

fn from_text(oid: Oid, bytes: &[u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &[u8]) -> Result<Self>

impl<'a> FromWireValue<'a> for &'a str

fn from_text(oid: Oid, bytes: &'a [u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &'a [u8]) -> Result<Self>

impl<'a> FromWireValue<'a> for &'a [u8]

fn from_text(oid: Oid, bytes: &'a [u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &'a [u8]) -> Result<Self>

impl<'a, T: FromWireValue<'a>> FromWireValue<'a> for Option<T>

fn from_null() -> Result<Self>

fn from_text(oid: Oid, bytes: &'a [u8]) -> Result<Self>

fn from_binary(oid: Oid, bytes: &'a [u8]) -> Result<Self>

Implementors