Struct msql_srv::QueryResultWriter
source · pub struct QueryResultWriter<'a, W: Read + Write> { /* private fields */ }
Expand description
Convenience type for providing query results to clients.
This type should not be dropped without calling
start
,
completed
, or
error
.
To send multiple resultsets, use
RowWriter::finish_one
and
complete_one
. These are similar to
RowWriter::finish
and completed
, but both eventually yield back the QueryResultWriter
so
that another resultset can be sent. To indicate that no more resultset will be sent, call
no_more_results
. All methods on
QueryResultWriter
(except no_more_results
) automatically start a new resultset. The
QueryResultWriter
may be dropped without calling no_more_results
, but in this case the
program may panic if an I/O error occurs when sending the end-of-records marker to the client.
To handle such errors, call no_more_results
explicitly.
Implementations§
source§impl<'a, W: Read + Write> QueryResultWriter<'a, W>
impl<'a, W: Read + Write> QueryResultWriter<'a, W>
sourcepub fn start(self, columns: &'a [Column]) -> Result<RowWriter<'a, W>>
pub fn start(self, columns: &'a [Column]) -> Result<RowWriter<'a, W>>
Start a resultset response to the client that conforms to the given columns
.
Note that if no columns are emitted, any written rows are ignored.
See RowWriter
.
sourcepub fn complete_one(self, rows: u64, last_insert_id: u64) -> Result<Self>
pub fn complete_one(self, rows: u64, last_insert_id: u64) -> Result<Self>
Send an empty resultset response to the client indicating that rows
rows were affected by
the query in this resultset. last_insert_id
may be given to communiate an identifier for
a client’s most recent insertion.
sourcepub fn completed(self, rows: u64, last_insert_id: u64) -> Result<()>
pub fn completed(self, rows: u64, last_insert_id: u64) -> Result<()>
Send an empty resultset response to the client indicating that rows
rows were affected by
the query. last_insert_id
may be given to communiate an identifier for a client’s most
recent insertion.
sourcepub fn error<E>(self, kind: ErrorKind, msg: &E) -> Result<()>
pub fn error<E>(self, kind: ErrorKind, msg: &E) -> Result<()>
Reply to the client’s query with an error.
sourcepub fn no_more_results(self) -> Result<()>
pub fn no_more_results(self) -> Result<()>
Send the last bits of the last resultset to the client, and indicate that there are no more resultsets coming.
Trait Implementations§
Auto Trait Implementations§
impl<'a, W> !RefUnwindSafe for QueryResultWriter<'a, W>
impl<'a, W> Send for QueryResultWriter<'a, W>where
W: Send,
impl<'a, W> Sync for QueryResultWriter<'a, W>where
W: Sync,
impl<'a, W> Unpin for QueryResultWriter<'a, W>
impl<'a, W> !UnwindSafe for QueryResultWriter<'a, W>
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