删除了无效数据表字段；

修改了getUserInfo，现在会获取到用户昵称而不是唯一且不可更改的username

src/main/java/com/web/web_assignment/DatabaseService.java

@@ -70,8 +70,7 @@ public class DatabaseService {
                 "interests CLOB, " +
                 "experiences CLOB, " +
                 "skills CLOB, " +
-                "careerGoals CLOB, " +
-                "projects CLOB)";
+                "careerGoals CLOB)";
 
         String createProjectsTable = "CREATE TABLE projects (" +
                 "id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY, " +
@@ -175,7 +174,7 @@ public class DatabaseService {
             ResultSet rs = stmt.executeQuery();
             if (rs.next()) {
                 return new UserInfo(
-                        rs.getString("username"),
+                        rs.getString("name"),
                         rs.getString("introduction"),
                         rs.getString("interests"),
                         rs.getString("experiences"),