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use crate::io::Encode;
use crate::postgres::io::PgBufMutExt;
use crate::postgres::types::Oid;
use crate::postgres::PgValueFormat;
#[derive(Debug)]
pub struct Bind<'a> {
/// The ID of the destination portal (`None` selects the unnamed portal).
pub portal: Option<Oid>,
/// The id of the source prepared statement.
pub statement: Oid,
/// The parameter format codes. Each must presently be zero (text) or one (binary).
///
/// There can be zero to indicate that there are no parameters or that the parameters all use the
/// default format (text); or one, in which case the specified format code is applied to all
/// parameters; or it can equal the actual number of parameters.
pub formats: &'a [PgValueFormat],
/// The number of parameters.
pub num_params: i16,
/// The value of each parameter, in the indicated format.
pub params: &'a [u8],
/// The result-column format codes. Each must presently be zero (text) or one (binary).
///
/// There can be zero to indicate that there are no result columns or that the
/// result columns should all use the default format (text); or one, in which
/// case the specified format code is applied to all result columns (if any);
/// or it can equal the actual number of result columns of the query.
pub result_formats: &'a [PgValueFormat],
}
impl Encode<'_> for Bind<'_> {
fn encode_with(&self, buf: &mut Vec<u8>, _: ()) {
buf.push(b'B');
buf.put_length_prefixed(|buf| {
buf.put_portal_name(self.portal);
buf.put_statement_name(self.statement);
#[allow(clippy::cast_possible_truncation, clippy::cast_possible_wrap)]
buf.extend(&(self.formats.len() as i16).to_be_bytes());
for &format in self.formats {
buf.extend(&(format as i16).to_be_bytes());
}
buf.extend(&self.num_params.to_be_bytes());
buf.extend(self.params);
if let Ok(len) = i16::try_from(self.result_formats.len()) {
buf.extend(&len.to_be_bytes());
for &format in self.result_formats {
buf.extend(&(format as i16).to_be_bytes());
}
}
});
}
}
// TODO: Unit Test Bind
// TODO: Benchmark Bind