Enum ExecError 

#[non_exhaustive]
pub enum ExecError {
    Build(Error),
    Decode {
        column: String,
        source: Error,
    },
    MissingColumn {
        column: String,
        available: Vec<String>,
    },
    RowNotFound,
    TooManyRows,
    UnsupportedValue {
        type_name: &'static str,
        family: Family,
    },
    Driver(Box<dyn Error + Send + Sync>),
    Other(String),
}

Everything that can go wrong while executing a statement.

Build failures wrap keelson_core::Error; decode failures additionally carry the column they happened in, because “which column” is the question a failing read always raises first. Driver failures are boxed rather than enumerated: their shapes belong to the backend crates.

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.

Build(Error)

The query failed to build. Nothing was sent to the database.

Decode

A column’s value could not be read as the requested Rust type.

column is the column name, or #N for positional access.

Fields

column: String

The column being read.

source: Error

Why the value would not convert — usually TypeMismatch.

MissingColumn

A column name was asked of a result set that has no such column.

Fields

column: String

The name that was asked for.

available: Vec<String>

The columns that are actually present, because a typo’d name is the bug nine times out of ten.

RowNotFound

fetch_one got zero rows.

TooManyRows

fetch_one or fetch_optional got more than one row.

sqlx silently takes the first; here “one” means one, so extras are an error rather than a hidden data bug.

UnsupportedValue

A Value this backend has no binding for — an unknown CustomValue, or a variant the engine cannot represent (e.g. u64::MAX where only signed 64-bit parameters exist). Refused loudly at bind time; never stringified and hoped for.

Fields

type_name: &'static str

The value’s type_name.

family: Family

The backend that refused it.

Driver(Box<dyn Error + Send + Sync>)

The driver reported a failure — connection, protocol, server error.

Other(String)

A failure with no shared shape.

Implementations

impl ExecError

pub fn driver(e: impl Error + Send + Sync + 'static) -> Self

Wrap a driver error. Backends call this; applications match on it.

pub fn other(msg: impl Into<String>) -> Self

Shorthand for ExecError::Other.

Trait Implementations

impl Debug for ExecError

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

Formats the value using the given formatter.

impl Display for ExecError

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

Formats the value using the given formatter.

impl Error for ExecError

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.

impl From<Error> for ExecError

fn from(e: Error) -> Self

Converts to this type from the input type.