Trait DatabaseError

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pub trait DatabaseError:
    'static
    + Send
    + Sync
    + Error {
    // Required methods
    fn message(&self) -> &str;
    fn kind(&self) -> ErrorKind;

    // Provided methods
    fn code(&self) -> Option<Cow<'_, str>> { ... }
    fn constraint(&self) -> Option<&str> { ... }
    fn table(&self) -> Option<&str> { ... }
    fn is_unique_violation(&self) -> bool { ... }
    fn is_foreign_key_violation(&self) -> bool { ... }
    fn is_check_violation(&self) -> bool { ... }
}

Expand description

An error that was returned from the database.

Required Methods§

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fn message(&self) -> &str

The primary, human-readable error message.

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fn kind(&self) -> ErrorKind

Returns the kind of the error, if supported.

§Note

Not all back-ends behave the same when reporting the error code.

Provided Methods§

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fn code(&self) -> Option<Cow<'_, str>>

The (SQLSTATE) code for the error.

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fn constraint(&self) -> Option<&str>

Returns the name of the constraint that triggered the error, if applicable. If the error was caused by a conflict of a unique index, this will be the index name.

§Note

Currently only populated by the Postgres driver.

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fn table(&self) -> Option<&str>

Returns the name of the table that was affected by the error, if applicable.

§Note

Currently only populated by the Postgres driver.

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fn is_unique_violation(&self) -> bool

Returns whether the error kind is a violation of a unique/primary key constraint.

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fn is_foreign_key_violation(&self) -> bool

Returns whether the error kind is a violation of a foreign key.

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fn is_check_violation(&self) -> bool

Returns whether the error kind is a violation of a check.

Implementations§

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impl dyn DatabaseError

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pub fn downcast_ref<E>(&self) -> &E
where E: DatabaseError,

Downcast a reference to this generic database error to a specific database error type.

§Panics

Panics if the database error type is not E. This is a deliberate contrast from Error::downcast_ref which returns Option<&E>. In normal usage, you should know the specific error type. In other cases, use try_downcast_ref.

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pub fn downcast<E>(self: Box<dyn DatabaseError>) -> Box<E>
where E: DatabaseError,

Downcast this generic database error to a specific database error type.

§Panics

Panics if the database error type is not E. This is a deliberate contrast from Error::downcast which returns Option<E>. In normal usage, you should know the specific error type. In other cases, use try_downcast.

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