Merge pull request #92 from 0xdeafbeef/main

fix mysql `TinyInt` serialization

Author: weiznich

src/mysql/serialize.rs

@@ -12,7 +12,7 @@ pub(super) struct ToSqlHelper {
 fn to_value((metadata, bind): (MysqlType, Option<Vec<u8>>)) -> Value {
     match bind {
         Some(bind) => match metadata {
-            MysqlType::Tiny => Value::Int(bind[0] as _),
+            MysqlType::Tiny => Value::Int((bind[0] as i8) as i64),
             MysqlType::Short => Value::Int(i16::from_ne_bytes(bind.try_into().unwrap()) as _),
             MysqlType::Long => Value::Int(i32::from_ne_bytes(bind.try_into().unwrap()) as _),
             MysqlType::LongLong => Value::Int(i64::from_ne_bytes(bind.try_into().unwrap())),

tests/type_check.rs

@@ -67,6 +67,14 @@ async fn check_tiny_int() {
     type_check::<_, sql_types::TinyInt>(conn, -1_i8).await;
     type_check::<_, sql_types::TinyInt>(conn, i8::MIN).await;
     type_check::<_, sql_types::TinyInt>(conn, i8::MAX).await;
+
+    // test case for https://github.com/weiznich/diesel_async/issues/91
+    let res = diesel::dsl::sql::<diesel::sql_types::Bool>("SELECT -1 = ")
+        .bind::<sql_types::TinyInt, _>(-1)
+        .get_result::<bool>(conn)
+        .await
+        .unwrap();
+    assert!(res);
 }
 
 #[cfg(feature = "mysql")]