Added ChangeUserName in db

backend/internal/database/db.go

@@ -27,6 +27,7 @@ type Database interface {
 	AddWeeklyReport(projectName string, userName string, week int, developmentTime int, meetingTime int, adminTime int, ownWorkTime int, studyTime int, testingTime int) error
 	AddUserToProject(username string, projectname string, role string) error
 	ChangeUserRole(username string, projectname string, role string) error
+	ChangeUserName(username string, newname string) error
 	GetAllUsersProject(projectname string) ([]UserProjectMember, error)
 	GetAllUsersApplication() ([]string, error)
 	GetProjectsForUser(username string) ([]types.Project, error)
@@ -67,6 +68,7 @@ const addWeeklyReport = `WITH UserLookup AS (SELECT id FROM users WHERE username
 						VALUES ((SELECT id FROM ProjectLookup), (SELECT id FROM UserLookup),?, ?, ?, ?, ?, ?, ?);`
 const addUserToProject = "INSERT INTO user_roles (user_id, project_id, p_role) VALUES (?, ?, ?)" // WIP
 const changeUserRole = "UPDATE user_roles SET p_role = ? WHERE user_id = ? AND project_id = ?"
+const changeUserName = "UPDATE user SET username = ? WHERE user_id = ?" // WIP
 
 const getProjectsForUser = `SELECT p.id, p.name, p.description FROM projects p	
 							JOIN user_roles ur ON p.id = ur.project_id
@@ -169,6 +171,20 @@ func (d *Db) ChangeUserRole(username string, projectname string, role string) er
 	return err3
 }
 
+// ChangeUserRole changes the role of a user within a project.
+func (d *Db) ChangeUserName(username string, newname string) error {
+	// Get the user ID
+	var userid int
+	userid, err := d.GetUserId(username)
+	if err != nil {
+		panic(err)
+	}
+
+	// Execute the SQL query to change the user's role
+	_, err2 := d.Exec(changeUserName, username, userid)
+	return err2
+}
+
 // GetUserRole retrieves the role of a user within a project.
 func (d *Db) GetUserRole(username string, projectname string) (string, error) {
 	var role string