Start to implement the save_all method.

backend/infrastructure/src/common/database_initialisation.rs

@@ -11,18 +11,18 @@ pub fn initialise_database_tables(connection: &Arc<Mutex<Connection>>) -> Result
                     id TEXT PRIMARY KEY,
                     initialisation_code VARCHAR
             );
-            CREATE TABLE IF NOT EXISTS system_resources (
-                id TEXT PRIMARY KEY,
-                datetime INTEGER NOT NULL,
-                cpu_usage INTEGER NOT NULL,
-                total_memory INTEGER NOT NULL,
-                used_memory INTEGER NOT NULL
-            );
             CREATE TABLE IF NOT EXISTS \"user\" (
                 id TEXT PRIMARY KEY,
                 username VARCHAR NOT NULL,
                 encrypted_password VARCHAR NOT NULL
             );
+            CREATE TABLE IF NOT EXISTS library_item (
+                id TEXT PRIMARY KEY,
+                name VARCHAR NOT NULL,
+                type INTEGER NOT NULL,
+                parent_folder_id TEXT NULL,
+                FOREIGN KEY (parent_folder_id) REFERENCES library_item (id)
+            );
             COMMIT;
             "
         )?;

backend/infrastructure/src/video/adapter.rs

@@ -100,6 +100,11 @@ impl VideoPort for LibraryItemAdapter {
     }
 
     fn save_all(&self, library_items: &Vec<LibraryItem>) -> Result<(), VideoError> {
+        let entities = library_items.iter()
+            .map(LibraryItemEntity::from_library_item)
+            .collect::<Vec<LibraryItemEntity>>();
+        
+        self.repository.save_all(entities)?;
         Ok(())
     }
 

backend/infrastructure/src/video/model.rs

@@ -24,15 +24,13 @@ pub struct LibraryItemEntity {
 }
 
 impl LibraryItemEntity {
-    pub fn from_library_item(library_item: &LibraryItem) -> Result<Self, Error> {
+    pub fn from_library_item(library_item: &LibraryItem) -> Self {
-        Ok(
         Self {
             id: library_item.id.clone(),
             name: library_item.name.clone(),
             r#type: Self::map_type_to_i8(library_item.r#type)?,
             parent_folder_id: None
         }
-        )
     }
 
     fn map_type_to_i8(item_type: LibraryItemType) -> Result<i8, Error> {

backend/infrastructure/src/video/repository.rs

@@ -61,4 +61,31 @@ impl LibraryItemSqliteRepository {
             }
         )
     }
+
+    fn save_all(&self, entities: Vec<LibraryItemEntity>) -> Result<(), Error> {
+        let database_connection = self.get_connection();
+
+        /*
+        Expected query if there is one single item in "entities":
+        INSERT INTO library_item (id, name, type) VALUES (?1, ?2, ?3);
+
+        Expected query if there are two items in "entities":
+        INSERT INTO library_item (id, name, type) VALUES (?1, ?2, ?3), ($4, $5, $6);
+         */
+        let mut prepared_statement = database_connection
+            .prepare(
+                "INSERT INTO library_item (
+                id,
+                name,
+                type,
+            ) VALUES (?1, ?2, ?3);",
+            )
+            .expect("Unable to prepare statement for user saving…");
+        prepared_statement.execute(rusqlite::params![
+            entity.id.to_string(),
+            entity.name,
+            entity.r#type
+        ]).expect("Unable to insert the library items.");
+        Ok(())
+    }
 }