use crate::client::InnerClient;
use crate::codec::FrontendMessage;
use crate::connection::RequestMessages;
use crate::types::Type;
use postgres_protocol::message::frontend;
use std::{
fmt,
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 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 name(&self) -> &str {
&self.0.name
}
pub fn params(&self) -> &[Type] {
&self.0.params
}
pub fn columns(&self) -> &[Column] {
&self.0.columns
}
}
pub struct Column {
name: String,
type_: Type,
}
impl Column {
pub(crate) fn new(name: String, type_: Type) -> Column {
Column { name, type_ }
}
pub fn name(&self) -> &str {
&self.name
}
pub fn type_(&self) -> &Type {
&self.type_
}
}
impl fmt::Debug for Column {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_struct("Column")
.field("name", &self.name)
.field("type", &self.type_)
.finish()
}
}