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Reads a batch of rows.
rows_view read_some_rows( execution_state& st);
The number of rows that will be read is unspecified. If the resultset
being read has still rows to read, at least one will be read. If there
are no more rows to be read, returns an empty rows_view
.
The number of rows that will be read depends on the input buffer size.
The bigger the buffer, the greater the batch size (up to a maximum).
You can set the initial buffer size in connection
's
constructor, using buffer_params::initial_read_size
. 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.