sqlx_postgres/message/
command_complete.rs

1use atoi::atoi;
2use memchr::memrchr;
3use sqlx_core::bytes::Bytes;
4
5use crate::error::Error;
6use crate::message::{BackendMessage, BackendMessageFormat};
7
8#[derive(Debug)]
9pub struct CommandComplete {
10    /// The command tag. This is usually a single word that identifies which SQL command
11    /// was completed.
12    tag: Bytes,
13}
14
15impl BackendMessage for CommandComplete {
16    const FORMAT: BackendMessageFormat = BackendMessageFormat::CommandComplete;
17
18    fn decode_body(bytes: Bytes) -> Result<Self, Error> {
19        Ok(CommandComplete { tag: bytes })
20    }
21}
22
23impl CommandComplete {
24    /// Returns the number of rows affected.
25    /// If the command does not return rows (e.g., "CREATE TABLE"), returns 0.
26    pub fn rows_affected(&self) -> u64 {
27        // Look backwards for the first SPACE
28        memrchr(b' ', &self.tag)
29            // This is either a word or the number of rows affected
30            .and_then(|i| atoi(&self.tag[(i + 1)..]))
31            .unwrap_or(0)
32    }
33}
34
35#[test]
36fn test_decode_command_complete_for_insert() {
37    const DATA: &[u8] = b"INSERT 0 1214\0";
38
39    let cc = CommandComplete::decode_body(Bytes::from_static(DATA)).unwrap();
40
41    assert_eq!(cc.rows_affected(), 1214);
42}
43
44#[test]
45fn test_decode_command_complete_for_begin() {
46    const DATA: &[u8] = b"BEGIN\0";
47
48    let cc = CommandComplete::decode_body(Bytes::from_static(DATA)).unwrap();
49
50    assert_eq!(cc.rows_affected(), 0);
51}
52
53#[test]
54fn test_decode_command_complete_for_update() {
55    const DATA: &[u8] = b"UPDATE 5\0";
56
57    let cc = CommandComplete::decode_body(Bytes::from_static(DATA)).unwrap();
58
59    assert_eq!(cc.rows_affected(), 5);
60}
61
62#[cfg(all(test, not(debug_assertions)))]
63#[bench]
64fn bench_decode_command_complete(b: &mut test::Bencher) {
65    const DATA: &[u8] = b"INSERT 0 1214\0";
66
67    b.iter(|| {
68        let _ = CommandComplete::decode_body(test::black_box(Bytes::from_static(DATA)));
69    });
70}
71
72#[cfg(all(test, not(debug_assertions)))]
73#[bench]
74fn bench_decode_command_complete_rows_affected(b: &mut test::Bencher) {
75    const DATA: &[u8] = b"INSERT 0 1214\0";
76
77    let data = CommandComplete::decode_body(Bytes::from_static(DATA)).unwrap();
78
79    b.iter(|| {
80        let _rows = test::black_box(&data).rows_affected();
81    });
82}
sqlx_postgres/message/command_complete.rs

sqlx_postgres/message/
command_complete.rs
