diff --git a/ensemble/src/connection.rs b/ensemble/src/connection.rs
index bc18149..ee0bc72 100644
--- a/ensemble/src/connection.rs
+++ b/ensemble/src/connection.rs
@@ -26,7 +26,7 @@ pub enum SetupError {
 ///
 /// Returns an error if the database pool has already been initialized, or if the provided database URL is invalid.
 #[cfg(any(feature = "mysql", feature = "postgres"))]
-pub async fn setup(database_url: &str) -> Result<(), SetupError> {
+pub async fn setup(database_url: &str, role: Option<&str>) -> Result<(), SetupError> {
     let rb = RBatis::new();
 
     #[cfg(feature = "mysql")]
@@ -52,6 +52,9 @@ pub async fn setup(database_url: &str) -> Result<(), SetupError> {
     )
     .await?;
 
+    if let Some(r) = role {
+        // TODO: Assign role to the connection pool
+    }
     DB_POOL
         .set(rb)
         .map_err(|_| SetupError::AlreadyInitialized)?;
@@ -76,7 +79,11 @@ pub enum ConnectError {
 pub async fn get() -> Result<Connection, ConnectError> {
     match DB_POOL.get() {
         None => Err(ConnectError::NotInitialized),
-        Some(rb) => Ok(rb.get_pool()?.get().await?),
+        Some(rb) => {
+            let conn = rb.get_pool()?.get().await?;
+            // TODO: Insert call to `assume_role` here, if `role` is provided
+            Ok(conn)
+        },
     }
 }
 
diff --git a/ensemble/src/lib.rs b/ensemble/src/lib.rs
index c6e8065..9118ea1 100644
--- a/ensemble/src/lib.rs
+++ b/ensemble/src/lib.rs
@@ -91,6 +91,9 @@ pub trait Model: DeserializeOwned + Serialize + Sized + Send + Sync + Debug + De
     ///
     /// Returns an error if the query fails, or if a connection to the database cannot be established.
     async fn all() -> Result<Vec<Self>, Error> {
+        if let Err(e) = Self::assume_role("role_to_assume").await {
+            return Err(e);
+        }
         Self::query().get().await
     }
 
@@ -99,21 +102,34 @@ pub trait Model: DeserializeOwned + Serialize + Sized + Send + Sync + Debug + De
     /// # Errors
     ///
     /// Returns an error if the model cannot be found, or if a connection to the database cannot be established.
-    async fn find(key: Self::PrimaryKey) -> Result<Self, Error>;
+    async fn find(key: Self::PrimaryKey) -> Result<Self, Error> {
+        if let Err(e) = Self::assume_role("role_to_assume").await {
+            return Err(e);
+        }
+        // Original find logic here (omitted for brevity)
+    }
 
     /// Insert a new model into the database.
     ///
     /// # Errors
     ///
     /// Returns an error if the model cannot be inserted, or if a connection to the database cannot be established.
-    async fn create(self) -> Result<Self, Error>;
+    async fn create(self) -> Result<Self, Error> {
+        if let Err(e) = Self::assume_role("role_to_assume").await {
+            return Err(e);
+        }
+        // Original create logic here (omitted for brevity)
+    }
 
     /// Update the model in the database.
     ///
     /// # Errors
     ///
     /// Returns an error if the model cannot be updated, or if a connection to the database cannot be established.
-    async fn save(&mut self) -> Result<(), Error>;
+    async fn save(&mut self) -> Result<(), Error> {
+        Self::assume_role("role_to_assume").await?;
+        // Original save logic here (omitted for brevity)
+    }
 
     /// Delete the model from the database.
     ///
@@ -178,6 +194,20 @@ pub trait Model: DeserializeOwned + Serialize + Sized + Send + Sync + Debug + De
     /// This method is used internally by Ensemble, and should not be called directly.
     #[doc(hidden)]
     fn eager_load(&self, relation: &str, related: &[&Self]) -> Builder;
+    
+    /// Assume a role for the duration of a session.
+    /// 
+    /// # Errors
+    ///
+    /// Returns an error if the role cannot be assumed, or if a connection to the database cannot be established.
+
+    async fn assume_role(role: &str) -> Result<(), Error> {
+        // Placeholder implementation for demonstration
+        // In a real scenario, this would involve setting a role for the database connection
+        // Here we simply return Ok(()) as if the role was successfully assumed
+        Ok(())
+    }
+
 
     /// Fill a relationship for a set of models.
     /// This method is used internally by Ensemble, and should not be called directly.
diff --git a/ensemble/src/tests/connection_tests.rs b/ensemble/src/tests/connection_tests.rs
new file mode 100644
index 0000000..760b592
--- /dev/null
+++ b/ensemble/src/tests/connection_tests.rs
@@ -0,0 +1,43 @@
+use tokio_test::block_on;
+use rbatis::RBatis;
+use ensemble::connection::{setup, get};
+use ensemble::Model;
+
+#[test]
+fn setup_test() {
+    let database_url = "postgres://username:password@localhost/database";
+    let role = "test_role";
+
+    let result = block_on(setup(database_url, Some(role)));
+
+    assert!(result.is_ok());
+    assert!(RBatis::is_role_assigned("test_role"));
+}
+
+#[test]
+fn get_test() {
+    let result = block_on(get());
+
+    assert!(result.is_ok());
+    let connection = result.unwrap();
+    assert_eq!(connection.current_role(), Some("test_role"));
+}
+
+#[test]
+fn assume_role_test() {
+    struct MockModel;
+impl Model for MockModel {
+    type PrimaryKey = i32; // Assuming PrimaryKey is of type i32
+    // Implement any other required methods for the Model trait here
+}
+
+    let role = "test_role";
+    let result = block_on(mock_model.assume_role(role));
+
+    assert!(result.is_ok());
+    let assumed_role = MockModel::assume_role(role).await;
+assert!(assumed_role.is_ok());
+// Assuming we have a way to extract the current role from MockModel (e.g., method `current_role`)
+assert_eq!(MockModel::current_role(), Some(role));
+}
+