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Reads a batch of rows.
template<
class CompletionToken>
auto
async_read_some_rows(
execution_state
& st,
CompletionToken&& token);
The number of rows that will be read is unspecified. If the operation
represented by st
has
still rows to read, at least one will be read. If there are no more rows,
or st.should_read_rows()
== false
,
returns an empty rows_view
.
The number of rows that will be read depends on the connection's buffer size. The bigger the buffer, the greater the batch size (up to a maximum). You can set the initial buffer size in the constructor. The buffer may be grown bigger by other read operations, if required.
The returned view points into memory owned by *this
. It will be valid until *this
performs the next network operation or is destroyed.
The handler signature for this operation is void(boost::mysql::error_code, boost::mysql::rows_view)
.
Intermediate completion handlers, as well as the final handler, are executed
using token
's associated
executor, or this->get_executor()
if the token doesn't have an associated executor.
If the final handler has an associated immediate executor, and the operation
completes immediately, the final handler is dispatched to it. Otherwise,
the final handler is called as if it was submitted using asio::post
, and is never be called inline
from within this function.