Enum CqlRequestKind

#[non_exhaustive]
pub enum CqlRequestKind {
    Startup,
    AuthResponse,
    Options,
    Query,
    Prepare,
    Execute,
    Batch,
    Register,
}

Possible requests sent by the client.

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.

Startup

Initialize the connection. The server will respond by either a READY message (in which case the connection is ready for queries) or an AUTHENTICATE message (in which case credentials will need to be provided using AUTH_RESPONSE).

This must be the first message of the connection, except for OPTIONS that can be sent before to find out the options supported by the server. Once the connection has been initialized, a client should not send any more STARTUP messages.

AuthResponse

Answers a server authentication challenge. Authentication in the protocol is SASL based. The server sends authentication challenges (a bytes token) to which the client answers with this message. Those exchanges continue until the server accepts the authentication by sending a AUTH_SUCCESS message after a client AUTH_RESPONSE. Note that the exchange begins with the client sending an initial AUTH_RESPONSE in response to a server AUTHENTICATE request.

The response to a AUTH_RESPONSE is either a follow-up AUTH_CHALLENGE message, an AUTH_SUCCESS message or an ERROR message.

Options

Asks the server to return which STARTUP options are supported. The server will respond with a SUPPORTED message.

Query

Performs a CQL query, i.e., executes an unprepared statement. The server will respond to a QUERY message with a RESULT message, the content of which depends on the query.

Prepare

Prepares a query for later execution (through EXECUTE). The server will respond with a RESULT::Prepared message.

Execute

Executes a prepared query. The response from the server will be a RESULT message.

Batch

Allows executing a list of queries (prepared or not) as a batch (note that only DML statements are accepted in a batch). The server will respond with a RESULT message.

Register

Register this connection to receive some types of events. The response to a REGISTER message will be a READY message.

Trait Implementations

impl Clone for CqlRequestKind

fn clone(&self) -> CqlRequestKind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CqlRequestKind

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

Formats the value using the given formatter.

impl Display for CqlRequestKind

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

Formats the value using the given formatter.

impl Copy for CqlRequestKind