diff --git a/src/entity/primary_key.rs b/src/entity/primary_key.rs
index f24c62df..9702b8a1 100644
--- a/src/entity/primary_key.rs
+++ b/src/entity/primary_key.rs
@@ -1,10 +1,7 @@
 use super::{ColumnTrait, IdenStatic, Iterable};
-use crate::TryGetable;
+use crate::{TryFromU64, TryGetable};
 use sea_query::IntoValueTuple;
-use std::{
-    fmt::{Debug, Display},
-    str::FromStr,
-};
+use std::fmt::{Debug, Display};
 
 //LINT: composite primary key cannot auto increment
 pub trait PrimaryKeyTrait: IdenStatic + Iterable {
@@ -15,7 +12,7 @@ pub trait PrimaryKeyTrait: IdenStatic + Iterable {
         + PartialEq
         + IntoValueTuple
         + TryGetable
-        + FromStr;
+        + TryFromU64;
 
     fn auto_increment() -> bool;
 }
diff --git a/src/error.rs b/src/error.rs
index 8a695dac..09f80b0a 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,4 +1,4 @@
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub enum DbErr {
     Conn(String),
     Exec(String),
diff --git a/src/executor/insert.rs b/src/executor/insert.rs
index e806fe62..6e657d23 100644
--- a/src/executor/insert.rs
+++ b/src/executor/insert.rs
@@ -1,5 +1,6 @@
 use crate::{
-    error::*, ActiveModelTrait, DatabaseConnection, EntityTrait, Insert, PrimaryKeyTrait, Statement,
+    error::*, ActiveModelTrait, DatabaseConnection, EntityTrait, Insert, PrimaryKeyTrait,
+    Statement, TryFromU64,
 };
 use sea_query::InsertStatement;
 use std::{future::Future, marker::PhantomData};
@@ -82,20 +83,17 @@ async fn exec_insert<A>(
 where
     A: ActiveModelTrait,
 {
-    // TODO: Postgres instead use query_one + returning clause
+    type ValueTypeOf<A> = <<<A as ActiveModelTrait>::Entity as EntityTrait>::PrimaryKey as PrimaryKeyTrait>::ValueType;
     let last_insert_id = match db {
         #[cfg(feature = "sqlx-postgres")]
         DatabaseConnection::SqlxPostgresPoolConnection(conn) => {
             let res = conn.query_one(statement).await?.unwrap();
             res.try_get("", "last_insert_id").unwrap_or_default()
         }
-        _ => db
-            .execute(statement)
-            .await?
-            .last_insert_id()
-            .to_string()
-            .parse()
-            .unwrap_or_default(),
+        _ => {
+            let last_insert_id = db.execute(statement).await?.last_insert_id();
+            ValueTypeOf::<A>::try_from_u64(last_insert_id)?
+        }
     };
     Ok(InsertResult { last_insert_id })
 }
diff --git a/src/executor/query.rs b/src/executor/query.rs
index b7e1d12e..5420c4c9 100644
--- a/src/executor/query.rs
+++ b/src/executor/query.rs
@@ -405,3 +405,49 @@ impl TryGetable for Option<Decimal> {
 
 #[cfg(feature = "with-uuid")]
 try_getable_all!(uuid::Uuid);
+
+pub trait TryFromU64: Sized {
+    fn try_from_u64(n: u64) -> Result<Self, DbErr>;
+}
+
+macro_rules! try_from_u64 {
+    ( $type: ty ) => {
+        impl TryFromU64 for $type {
+            fn try_from_u64(n: u64) -> Result<Self, DbErr> {
+                use std::convert::TryInto;
+                n.try_into().map_err(|_| {
+                    DbErr::Exec(format!(
+                        "fail to convert '{}' into '{}'",
+                        n,
+                        stringify!($type)
+                    ))
+                })
+            }
+        }
+    };
+}
+
+try_from_u64!(i8);
+try_from_u64!(i16);
+try_from_u64!(i32);
+try_from_u64!(i64);
+try_from_u64!(u8);
+try_from_u64!(u16);
+try_from_u64!(u32);
+try_from_u64!(u64);
+
+macro_rules! try_from_u64_err {
+    ( $type: ty ) => {
+        impl TryFromU64 for $type {
+            fn try_from_u64(_: u64) -> Result<Self, DbErr> {
+                Err(DbErr::Exec(format!(
+                    "{} cannot be converted from u64",
+                    stringify!($type)
+                )))
+            }
+        }
+    };
+}
+
+#[cfg(feature = "with-uuid")]
+try_from_u64_err!(uuid::Uuid);
diff --git a/tests/common/bakery_chain/metadata.rs b/tests/common/bakery_chain/metadata.rs
new file mode 100644
index 00000000..ecef26c3
--- /dev/null
+++ b/tests/common/bakery_chain/metadata.rs
@@ -0,0 +1,61 @@
+use sea_orm::entity::prelude::*;
+use uuid::Uuid;
+
+#[derive(Copy, Clone, Default, Debug, DeriveEntity)]
+pub struct Entity;
+
+impl EntityName for Entity {
+    fn table_name(&self) -> &str {
+        "metadata"
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, DeriveModel, DeriveActiveModel)]
+pub struct Model {
+    pub uuid: Uuid,
+    pub key: String,
+    pub value: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveColumn)]
+pub enum Column {
+    Uuid,
+    Key,
+    Value,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DerivePrimaryKey)]
+pub enum PrimaryKey {
+    Uuid,
+}
+
+impl PrimaryKeyTrait for PrimaryKey {
+    type ValueType = Uuid;
+
+    fn auto_increment() -> bool {
+        false
+    }
+}
+
+#[derive(Copy, Clone, Debug, EnumIter)]
+pub enum Relation {}
+
+impl ColumnTrait for Column {
+    type EntityName = Entity;
+
+    fn def(&self) -> ColumnDef {
+        match self {
+            Self::Uuid => ColumnType::Uuid.def(),
+            Self::Key => ColumnType::String(None).def(),
+            Self::Value => ColumnType::String(None).def(),
+        }
+    }
+}
+
+impl RelationTrait for Relation {
+    fn def(&self) -> RelationDef {
+        unreachable!()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
diff --git a/tests/common/bakery_chain/mod.rs b/tests/common/bakery_chain/mod.rs
index 89028aab..3282766d 100644
--- a/tests/common/bakery_chain/mod.rs
+++ b/tests/common/bakery_chain/mod.rs
@@ -4,6 +4,7 @@ pub mod cake;
 pub mod cakes_bakers;
 pub mod customer;
 pub mod lineitem;
+pub mod metadata;
 pub mod order;
 
 pub use super::baker::Entity as Baker;
@@ -12,4 +13,5 @@ pub use super::cake::Entity as Cake;
 pub use super::cakes_bakers::Entity as CakesBakers;
 pub use super::customer::Entity as Customer;
 pub use super::lineitem::Entity as Lineitem;
+pub use super::metadata::Entity as Metadata;
 pub use super::order::Entity as Order;
diff --git a/tests/common/setup/mod.rs b/tests/common/setup/mod.rs
index 7528cf6c..74e35b45 100644
--- a/tests/common/setup/mod.rs
+++ b/tests/common/setup/mod.rs
@@ -45,13 +45,14 @@ pub async fn setup(base_url: &str, db_name: &str) -> DatabaseConnection {
         Database::connect(base_url).await.unwrap()
     };
 
-    assert!(schema::create_bakery_table(&db).await.is_ok());
-    assert!(schema::create_baker_table(&db).await.is_ok());
-    assert!(schema::create_customer_table(&db).await.is_ok());
-    assert!(schema::create_order_table(&db).await.is_ok());
-    assert!(schema::create_cake_table(&db).await.is_ok());
-    assert!(schema::create_cakes_bakers_table(&db).await.is_ok());
-    assert!(schema::create_lineitem_table(&db).await.is_ok());
+    schema::create_bakery_table(&db).await.unwrap();
+    schema::create_baker_table(&db).await.unwrap();
+    schema::create_customer_table(&db).await.unwrap();
+    schema::create_order_table(&db).await.unwrap();
+    schema::create_cake_table(&db).await.unwrap();
+    schema::create_cakes_bakers_table(&db).await.unwrap();
+    schema::create_lineitem_table(&db).await.unwrap();
+    schema::create_metadata_table(&db).await.unwrap();
     db
 }
 
diff --git a/tests/common/setup/schema.rs b/tests/common/setup/schema.rs
index 4eba40ab..0e124fa2 100644
--- a/tests/common/setup/schema.rs
+++ b/tests/common/setup/schema.rs
@@ -254,3 +254,20 @@ pub async fn create_cake_table(db: &DbConn) -> Result<ExecResult, DbErr> {
 
     create_table(db, &stmt).await
 }
+
+pub async fn create_metadata_table(db: &DbConn) -> Result<ExecResult, DbErr> {
+    let stmt = sea_query::Table::create()
+        .table(metadata::Entity)
+        .if_not_exists()
+        .col(
+            ColumnDef::new(metadata::Column::Uuid)
+                .uuid()
+                .not_null()
+                .primary_key(),
+        )
+        .col(ColumnDef::new(metadata::Column::Key).string().not_null())
+        .col(ColumnDef::new(metadata::Column::Value).string().not_null())
+        .to_owned();
+
+    create_table(db, &stmt).await
+}
diff --git a/tests/primary_key_tests.rs b/tests/primary_key_tests.rs
new file mode 100644
index 00000000..2f74eafc
--- /dev/null
+++ b/tests/primary_key_tests.rs
@@ -0,0 +1,41 @@
+use sea_orm::{entity::prelude::*, DatabaseConnection, Set};
+pub mod common;
+pub use common::{bakery_chain::*, setup::*, TestContext};
+use uuid::Uuid;
+
+#[sea_orm_macros::test]
+#[cfg(any(
+    feature = "sqlx-mysql",
+    feature = "sqlx-sqlite",
+    feature = "sqlx-postgres"
+))]
+async fn main() -> Result<(), DbErr> {
+    let ctx = TestContext::new("bakery_chain_schema_primary_key_tests").await;
+
+    create_metadata(&ctx.db).await?;
+
+    ctx.delete().await;
+
+    Ok(())
+}
+
+async fn create_metadata(db: &DatabaseConnection) -> Result<(), DbErr> {
+    let metadata = metadata::ActiveModel {
+        uuid: Set(Uuid::new_v4()),
+        key: Set("markup".to_owned()),
+        value: Set("1.18".to_owned()),
+    };
+
+    let res = Metadata::insert(metadata.clone()).exec(db).await;
+
+    if cfg!(feature = "sqlx-postgres") {
+        assert_eq!(metadata.uuid.unwrap(), res?.last_insert_id);
+    } else {
+        assert_eq!(
+            res.unwrap_err(),
+            DbErr::Exec("uuid::Uuid cannot be converted from u64".to_owned())
+        );
+    }
+
+    Ok(())
+}