don't typecheck parameters on MySQL

Author: abonander

sqlx-macros/src/backend/mod.rs

@@ -1,8 +1,16 @@
 use sqlx::Backend;
 
+#[derive(PartialEq, Eq)]
+pub enum ParamChecking {
+    Strong,
+    Weak
+}
+
 pub trait BackendExt: Backend {
     const BACKEND_PATH: &'static str;
 
+    const PARAM_CHECKING: ParamChecking;
+
     fn quotable_path() -> syn::Path {
         syn::parse_str(Self::BACKEND_PATH).unwrap()
     }
@@ -13,9 +21,10 @@ pub trait BackendExt: Backend {
 }
 
 macro_rules! impl_backend_ext {
-    ($backend:path { $($(#[$meta:meta])? $ty:ty $(| $input:ty)?),*$(,)? }) => {
+    ($backend:path { $($(#[$meta:meta])? $ty:ty $(| $input:ty)?),*$(,)? }, ParamChecking::$param_checking:ident) => {
         impl $crate::backend::BackendExt for $backend {
             const BACKEND_PATH: &'static str = stringify!($backend);
+            const PARAM_CHECKING: $crate::backend::ParamChecking = $crate::backend::ParamChecking::$param_checking;
 
             fn param_type_for_id(id: &Self::TypeId) -> Option<&'static str> {
                 use sqlx::types::TypeMetadata;

sqlx-macros/src/backend/mysql.rs

@@ -7,5 +7,6 @@ impl_backend_ext! {
         i64,
         f32,
         f64
-    }
+    },
+    ParamChecking::Weak
 }

sqlx-macros/src/backend/postgres.rs

@@ -19,5 +19,6 @@ impl_backend_ext! {
         sqlx::types::chrono::NaiveDateTime,
         #[cfg(feature = "chrono")]
         sqlx::types::chrono::DateTime<sqlx::types::chrono::Utc> | sqlx::types::chrono::DateTime<_>,
-    }
+    },
+    ParamChecking::Strong
 }

sqlx-macros/src/query.rs

@@ -12,7 +12,7 @@ use syn::{
 use quote::{format_ident, quote, quote_spanned, ToTokens};
 use sqlx::{Connection, HasTypeMetadata};
 
-use crate::backend::BackendExt;
+use crate::backend::{BackendExt, ParamChecking};
 
 pub struct MacroInput {
     sql: String,
@@ -107,7 +107,7 @@ pub async fn process_sql<C: Connection>(
         (record_type.to_token_stream(), generate_record_def(&describe, &record_type)?)
     };
 
-    let params = if input.args.is_empty() {
+    let params = if <C::Backend as BackendExt>::PARAM_CHECKING == ParamChecking::Weak || input.args.is_empty() {
         quote! {
             let params = ();
         }