use crate::client::InnerClient;
use crate::codec::FrontendMessage;
use crate::connection::RequestMessages;
use crate::types::Type;
use postgres_protocol::message::frontend;
use std::sync::{Arc, Weak};
struct StatementInner {
client: Weak<InnerClient>,
name: String,
params: Vec<Type>,
columns: Vec<Column>,
}
impl Drop for StatementInner {
fn drop(&mut self) {
if self.name.is_empty() {
return;
}
if let Some(client) = self.client.upgrade() {
let buf = client.with_buf(|buf| {
frontend::close(b'S', &self.name, buf).unwrap();
frontend::sync(buf);
buf.split().freeze()
});
let _ = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)));
}
}
}
#[derive(Clone)]
pub struct Statement(Arc<StatementInner>);
impl Statement {
pub(crate) fn new(
inner: &Arc<InnerClient>,
name: String,
params: Vec<Type>,
columns: Vec<Column>,
) -> Statement {
Statement(Arc::new(StatementInner {
client: Arc::downgrade(inner),
name,
params,
columns,
}))
}
pub(crate) fn unnamed(params: Vec<Type>, columns: Vec<Column>) -> Statement {
Statement(Arc::new(StatementInner {
client: Weak::new(),
name: String::new(),
params,
columns,
}))
}
pub(crate) fn name(&self) -> &str {
&self.0.name
}
pub fn params(&self) -> &[Type] {
&self.0.params
}
pub fn columns(&self) -> &[Column] {
&self.0.columns
}
}
impl std::fmt::Debug for Statement {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
f.debug_struct("Statement")
.field("name", &self.0.name)
.field("params", &self.0.params)
.field("columns", &self.0.columns)
.finish_non_exhaustive()
}
}
#[derive(Debug)]
pub struct Column {
pub(crate) name: String,
pub(crate) table_oid: Option<u32>,
pub(crate) column_id: Option<i16>,
pub(crate) r#type: Type,
}
impl Column {
pub fn name(&self) -> &str {
&self.name
}
pub fn table_oid(&self) -> Option<u32> {
self.table_oid
}
pub fn column_id(&self) -> Option<i16> {
self.column_id
}
pub fn type_(&self) -> &Type {
&self.r#type
}
}