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64 lines
2.2 KiB
Rust
64 lines
2.2 KiB
Rust
use super::Write;
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use crate::io::BufMut;
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use crate::postgres::protocol::{StatementId, TypeFormat};
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use byteorder::{ByteOrder, NetworkEndian};
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pub(crate) struct Bind<'a> {
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/// The name of the destination portal (an empty string selects the unnamed portal).
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pub(crate) portal: &'a str,
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/// The id of the source prepared statement (0 selects the unnamed statement).
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pub(crate) statement: StatementId,
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/// The parameter format codes. Each must presently be zero (text) or one (binary).
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///
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/// There can be zero to indicate that there are no parameters or that the parameters all use the
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/// default format (text); or one, in which case the specified format code is applied to all
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/// parameters; or it can equal the actual number of parameters.
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pub(crate) formats: &'a [TypeFormat],
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pub(crate) values_len: i16,
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pub(crate) values: &'a [u8],
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/// The result-column format codes. Each must presently be zero (text) or one (binary).
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///
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/// There can be zero to indicate that there are no result columns or that the
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/// result columns should all use the default format (text); or one, in which
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/// case the specified format code is applied to all result columns (if any);
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/// or it can equal the actual number of result columns of the query.
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pub(crate) result_formats: &'a [TypeFormat],
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}
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impl Write for Bind<'_> {
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fn write(&self, buf: &mut Vec<u8>) {
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buf.push(b'B');
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let pos = buf.len();
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buf.put_i32::<NetworkEndian>(0); // skip over len
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buf.put_str_nul(self.portal);
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self.statement.write(buf);
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buf.put_i16::<NetworkEndian>(self.formats.len() as i16);
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for &format in self.formats {
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buf.put_i16::<NetworkEndian>(format as i16);
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}
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buf.put_i16::<NetworkEndian>(self.values_len);
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buf.extend_from_slice(self.values);
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buf.put_i16::<NetworkEndian>(self.result_formats.len() as i16);
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for &format in self.result_formats {
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buf.put_i16::<NetworkEndian>(format as i16);
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}
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// Write-back the len to the beginning of this frame
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let len = buf.len() - pos;
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NetworkEndian::write_i32(&mut buf[pos..], len as i32);
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}
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}
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