code: public java.util.List<String> getVpcSecurityGroupIds() {
          if (vpcSecurityGroupIds == null) {
              vpcSecurityGroupIds = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return vpcSecurityGroupIds;
      }
docs: <p>
  A list of EC2 VPC security groups to authorize on this DB instance. This change is asynchronously applied as soon
  as possible.
  </p>
  <p>
  <b>Amazon Aurora</b>
  </p>
  <p>
  Not applicable. The associated list of EC2 VPC security groups is managed by the DB cluster. For more
  information, see <a>ModifyDBCluster</a>.
  </p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing VpcSecurityGroupIds.
  </p>
  </li>
  </ul>
  
  @return A list of EC2 VPC security groups to authorize on this DB instance. This change is asynchronously applied
  as soon as possible.</p>
  <p>
  <b>Amazon Aurora</b>
  </p>
  <p>
  Not applicable. The associated list of EC2 VPC security groups is managed by the DB cluster. For more
  information, see <a>ModifyDBCluster</a>.
  </p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing VpcSecurityGroupIds.
  </p>
  </li>