Enum ConnectorError 

#[non_exhaustive]
pub enum ConnectorError {
    Io(String),
    Schema(String),
    DialectMismatch {
        used: Dialect,
        actual: Dialect,
    },
    Driver(String),
    Query(String),
    ParameterBind {
        name: String,
        reason: String,
    },
    Connection(String),
}

Errors a SqlConnector impl may surface from SqlConnector::schema_text or SqlConnector::execute.

The enum is #[non_exhaustive], so Phase 84 (CONN-01) adds the execute-time variants (Driver, Query, ParameterBind, Connection) additively without a semver break, and later phases can add more failure modes the same way.

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.

Io(String)

Underlying transport / driver I/O error.

Schema(String)

Failed to enumerate or render the schema text.

DialectMismatch

A connector was asked to handle work for the wrong dialect (e.g. a query labelled Postgres routed to a MySQL connector).

Fields

used: Dialect

Dialect declared by the caller / query.

actual: Dialect

Dialect actually served by this connector.

Driver(String)

The underlying driver reported a failure (e.g. a tokio-postgres, sqlx, aws-sdk-athena, or rusqlite error) that is not a query or connection problem on its own.

Query(String)

The backend rejected the query (syntax error, unknown table/column, permission denied on the statement, etc.).

ParameterBind

A named parameter from the caller’s &[(String, Value)] slice could not be bound to the translated statement (type mismatch, missing binding, unsupported value shape, etc.).

Fields

name: String

Name of the parameter that failed to bind.

reason: String

Human-readable reason the bind failed.

Connection(String)

The connector could not establish or maintain a connection to the backend.

Security

Implementors MUST redact credentials (passwords, AWS keys) before constructing this variant — the inner String reaches MCP clients via Display. NEVER pass a raw DATABASE_URL or AWS_* value here; strip or mask the secret first (T-84-01-01).

Trait Implementations

impl Debug for ConnectorError

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

Formats the value using the given formatter.

impl Display for ConnectorError

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

Formats the value using the given formatter.

impl Error for ConnectorError

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.