refactor(sql): Allow multiple drivers at the same time (#1838)

* refactor(sql): Allow multiple drivers at the same time

* fmt

* remove default feature comment [skip ci]

* what was that doing there [skip ci]

* disable public methods for now

plugins/sql/src/error.rs

@@ -0,0 +1,28 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use serde::{Serialize, Serializer};
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error(transparent)]
+    Sql(#[from] sqlx::Error),
+    #[error(transparent)]
+    Migration(#[from] sqlx::migrate::MigrateError),
+    #[error("invalid connection url: {0}")]
+    InvalidDbUrl(String),
+    #[error("database {0} not loaded")]
+    DatabaseNotLoaded(String),
+    #[error("unsupported datatype: {0}")]
+    UnsupportedDatatype(String),
+}
+
+impl Serialize for Error {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}