Enum TypeError 

#[non_exhaustive]
pub enum TypeError {
    UnexpectedNull,
    TypeMismatch {
        expected: &'static str,
        actual: String,
    },
    OutOfRange {
        target_type: &'static str,
    },
    InvalidEncoding(String),
    InvalidBinary(String),
    InvalidDateTime(String),
    InvalidDecimal(String),
    InvalidUuid(String),
    Truncation(String),
    UnsupportedConversion {
        from: String,
        to: &'static str,
    },
    UnsupportedType {
        sql_type: String,
        reason: String,
    },
    BufferTooSmall {
        needed: usize,
        available: usize,
    },
}

Errors that can occur during type conversion.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

UnexpectedNull

Value is null when non-null was expected.

TypeMismatch

Type mismatch during conversion.

Fields

expected: &'static str

Expected type name.

actual: String

Actual type name.

OutOfRange

Value is out of range for target type.

Fields

target_type: &'static str

Target type name.

InvalidEncoding(String)

Invalid encoding in string data.

InvalidBinary(String)

Invalid binary data.

InvalidDateTime(String)

Invalid date/time value.

InvalidDecimal(String)

Invalid decimal value.

InvalidUuid(String)

Invalid UUID value.

Truncation(String)

Truncation occurred during conversion.

UnsupportedConversion

Unsupported type conversion.

Fields

from: String

Source type.

to: &'static str

Target type.

UnsupportedType

SQL type rejected as unsupported in this context (e.g. deprecated types).

Fields

sql_type: String

The rejected SQL type name.

reason: String

Explanation and suggested alternative.

BufferTooSmall

Buffer too small for value.

Fields

needed: usize

Bytes needed.

available: usize

Bytes available.

Implementations

impl TypeError

pub fn is_transient(&self) -> bool

Check if this error is transient and may succeed on retry.

Type conversion errors are always terminal — they indicate a mismatch between the SQL type and the Rust type, which won’t resolve itself on retry.

pub fn is_terminal(&self) -> bool

Check if this error is terminal and will never succeed on retry.

All type errors are terminal.

Trait Implementations

impl Debug for TypeError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for TypeError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for TypeError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.