chore: feature gate several things to resolve warnings in WASM build

quaint/src/connector/queryable.rs

@@ -112,6 +112,7 @@ pub trait TransactionCapable: Queryable {
     ) -> crate::Result<Box<dyn Transaction + 'a>>;
 }
 
+#[cfg(any(feature = "mssql-native", feature = "postgresql-native", feature = "mysql-native"))]
 macro_rules! impl_default_TransactionCapable {
     ($t:ty) => {
         #[async_trait]
@@ -130,4 +131,5 @@ macro_rules! impl_default_TransactionCapable {
     };
 }
 
+#[cfg(any(feature = "mssql-native", feature = "postgresql-native", feature = "mysql-native"))]
 pub(crate) use impl_default_TransactionCapable;

quaint/src/connector/transaction.rs

@@ -21,6 +21,7 @@ pub trait Transaction: Queryable {
     fn as_queryable(&self) -> &dyn Queryable;
 }
 
+#[cfg(any(feature = "mssql-native", feature = "postgresql-native", feature = "mysql-native"))]
 pub(crate) struct TransactionOptions {
     /// The isolation level to use.
     pub(crate) isolation_level: Option<IsolationLevel>,
@@ -29,6 +30,17 @@ pub(crate) struct TransactionOptions {
     pub(crate) isolation_first: bool,
 }
 
+#[cfg(any(feature = "mssql-native", feature = "postgresql-native", feature = "mysql-native"))]
+impl TransactionOptions {
+    pub fn new(isolation_level: Option<IsolationLevel>, isolation_first: bool) -> Self {
+        Self {
+            isolation_level,
+            isolation_first,
+        }
+    }
+}
+
+
 /// A default representation of an SQL database transaction. If not commited, a
 /// transaction will be rolled back by default when dropped.
 ///
@@ -40,6 +52,7 @@ pub struct DefaultTransaction<'a> {
 }
 
 impl<'a> DefaultTransaction<'a> {
+    #[cfg(any(feature = "mssql-native", feature = "postgresql-native", feature = "mysql-native"))]
     pub(crate) async fn new(
         inner: &'a dyn Queryable,
         begin_stmt: &str,
@@ -196,11 +209,3 @@ impl FromStr for IsolationLevel {
         }
     }
 }
-impl TransactionOptions {
-    pub fn new(isolation_level: Option<IsolationLevel>, isolation_first: bool) -> Self {
-        Self {
-            isolation_level,
-            isolation_first,
-        }
-    }
-}