Merge pull request rust-postgres#836 from subzerocloud/master

Implement Unknown encoding for query parameters

Author: sfackler

postgres-types/src/lib.rs

@@ -834,8 +834,32 @@ pub trait ToSql: fmt::Debug {
         ty: &Type,
         out: &mut BytesMut,
     ) -> Result<IsNull, Box<dyn Error + Sync + Send>>;
+
+    /// Specify the encode format
+    fn encode_format(&self) -> Format { Format::Binary }
 }
 
+/// Supported Postgres message format types
+///
+/// Using Text format in a message assumes a Postgres `SERVER_ENCODING` of `UTF8`
+pub enum Format {
+    /// Text format (UTF-8)
+    Text,
+    /// Compact, typed binary format
+    Binary,
+}
+
+/// Convert from `Format` to the Postgres integer representation of those formats
+impl From<Format> for i16 {
+    fn from(format: Format) -> Self {
+        match format {
+            Format::Text => 0,
+            Format::Binary => 1,
+        }
+    }
+}
+
+
 impl<'a, T> ToSql for &'a T
 where
     T: ToSql,

tokio-postgres/src/query.rs

@@ -156,6 +156,7 @@ where
     I: IntoIterator<Item = P>,
     I::IntoIter: ExactSizeIterator,
 {
+    let (param_formats, params):(Vec<_>, Vec<_>) = params.into_iter().map(|p|->(i16, P){(p.borrow_to_sql().encode_format().into(),p)}).unzip();
     let params = params.into_iter();
 
     assert!(
@@ -169,7 +170,7 @@ where
     let r = frontend::bind(
         portal,
         statement.name(),
-        Some(1),
+        param_formats,
         params.zip(statement.params()).enumerate(),
         |(idx, (param, ty)), buf| match param.borrow_to_sql().to_sql_checked(ty, buf) {
             Ok(IsNull::No) => Ok(postgres_protocol::IsNull::No),