Implement update method in MySQLDAO and editById in TaskResource to update tasks in the database

SETUP.md

@@ -78,6 +78,26 @@ GRAPHQL http://localhost:8080/graphql
 mutation {
   deleteById(id: 14)
 }
+
+###
+GRAPHQL http://localhost:8080/graphql
+
+mutation {
+    editById(id: 2, updatedTask: {
+        description: "Updated Task",
+        priority: Low,
+        tagList: [Personal],
+        creation: "2025-06-27T16:20:30.1Z",
+        conclusion: null
+    }) {
+    description
+    priority
+    tagList
+    creation
+    conclusion
+    }
+}
+
 ###
 ```
 3. Useful end-points:

src/main/java/br/com/pedr0limpio/resources/TaskResource.java

@@ -39,26 +39,26 @@ public List<Task> listAll() { //TODO[#2]: Implement the listAll() method to list
         return taskBaseDAO.getAllTasks();
     }
 
-@Query
-@Description("Fetch a task by id")
-public Task searchById(int id) {
-    try {
-        return taskBaseDAO.getById(id);
-    } catch (Exception e) {
-        LOG.error("Error fetching task by id", e);
-        throw new RuntimeException("Error fetching task by id", e);
+    @Query
+    @Description("Fetch a task by id")
+    public Task searchById(int id) {
+        try {
+            return taskBaseDAO.getById(id);
+        } catch (Exception e) {
+            LOG.error("Error fetching task by id", e);
+            throw new RuntimeException("Error fetching task by id", e);
+        }
     }
-}
 
     @Mutation
     @Transactional
-    public Task editById(int id, Task taskFor) { //TODO[#4]: Implement the editById(int id, Task taskFor) method to update a task
+    public Task editById(int id, Task updatedTask) {
         try {
-            taskBaseDAO.update(id, taskFor);
-            return taskFor;
+            taskBaseDAO.update(id, updatedTask);
+            return updatedTask;
         } catch (Exception e) {
-            LOG.error("Error editing task", e);
-            throw new RuntimeException("Error editing task", e);
+            LOG.error("Error updating task with id " + id, e);
+            throw new RuntimeException("Could not update task", e);
         }
     }
 

src/main/java/br/com/pedr0limpio/services/MySQLDAO.java

@@ -177,8 +177,62 @@ public Task getById(int id) { //Implement getById to fetch in DB for a task.
 }
 
     @Override
-    public void update(int idFrom, Task taskFor) { //TODO[#11]: Implement update(int idFrom, Task taskFor) to update a task in DB.
+    public void update(int idFrom, Task taskFor) {
+        Connection conn = null;
+        try {
+            conn = DriverManager.getConnection(url, username, password);
+            conn.setAutoCommit(false);
+
+            // update main task fields
+            String sql = "UPDATE TASKS SET description = ?, priority = ?, created_at = ?, conclusion_at = ? WHERE task_id = ?";
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, taskFor.getDescription());
+                stmt.setString(2, taskFor.getPriority().name());
+                stmt.setTimestamp(3, new Timestamp(taskFor.getCreation().getTime()));
+                if (taskFor.getConclusion() != null) {
+                    stmt.setTimestamp(4, new Timestamp(taskFor.getConclusion().getTime()));
+                } else {
+                    stmt.setNull(4, java.sql.Types.TIMESTAMP);
+                }
+                stmt.setInt(5, idFrom);
+                stmt.executeUpdate();
+            }
+
+            // remove old tags
+            String deleteTagsSql = "DELETE FROM TASK_TAGS WHERE task_id = ?";
+            try (PreparedStatement stmt = conn.prepareStatement(deleteTagsSql)) {
+                stmt.setInt(1, idFrom);
+                stmt.executeUpdate();
+            }
+
+            // insert new tags
+            if (taskFor.getTagList() != null) {
+                for (Tag tag : taskFor.getTagList()) {
+                    int tagId = insertOrGetTagId(conn, tag.name());
+                    insertTaskTag(conn, idFrom, tagId);
+                }
+            }
 
+            conn.commit();
+        } catch (SQLException e) {
+            if (conn != null) {
+                try {
+                    conn.rollback();
+                } catch (SQLException ex) {
+                    LOGGER.error("Rollback failed: " + ex.getMessage());
+                }
+            }
+            LOGGER.error("Update failed: " + e.getMessage());
+            throw new RuntimeException("Database update failed", e);
+        } finally {
+            if (conn != null) {
+                try {
+                    conn.close();
+                } catch (SQLException e) {
+                    LOGGER.error("Connection close failed: " + e.getMessage());
+                }
+            }
+        }
     }
 
     @Override