Struct opensrv_mysql::QueryResultWriter
source · [−]pub struct QueryResultWriter<'a, W: 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
sourceimpl<'a, W: Write> QueryResultWriter<'a, W>
impl<'a, W: 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, ok_packet: OkResponse) -> Result<Self>
pub fn complete_one(self, ok_packet: OkResponse) -> 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, ok_packet: OkResponse) -> Result<()>
pub fn completed(self, ok_packet: OkResponse) -> 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<()> where
E: Borrow<[u8]> + ?Sized,
pub fn error<E>(self, kind: ErrorKind, msg: &E) -> Result<()> where
E: Borrow<[u8]> + ?Sized,
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> where
W: RefUnwindSafe,
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>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
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Mutably borrows from an owned value. Read more
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impl<T> FmtForward for T
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Self: Binary,
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Self: Binary,
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Self: Display,
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Self: Display,
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Self: UpperHex,
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&'a Self: for<'a> IntoIterator,
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