ajaxCRUD :关于插入的两个问题

我开始玩ajaxCRUD这似乎很简单但有效的课程。
我有一个这样的表用户：

CREATE TABLE tbl_users (
  usr_id        INT NOT NULL AUTO_INCREMENT ,
  usr_name      VARCHAR( 64 ) NOT NULL DEFAULT '' ,
  usr_surname   VARCHAR( 64 ) NOT NULL DEFAULT '' ,
  usr_pwd       VARCHAR( 64 ) NOT NULL ,
  usr_level     INT( 1 ) NOT NULL DEFAULT 0,
  PRIMARY KEY ( usr_id )
) ENGINE = InnoDB;

我的PHP代码是：

<?php
  $tblUsers->omitPrimaryKey();
  $tblUsers->displayAs("usr_name", "Nome");
  $tblUsers->displayAs("usr_surname", "Cognome");
  $tblUsers->displayAs("usr_pwd", "Password");
  $tblUsers->displayAs("usr_level", "Livello");
  $tblUsers->omitField("usr_pwd");
  $tblUsers->modifyFieldWithClass("usr_pwd", "password");
  $allowable_vals = array(1 => "USER", 2 => "ADMIN", 3 => "SUPERUSER");
  $tblUsers->defineAllowableValues("usr_level", $allowable_vals);
  $tblUsers->formatFieldWithFunction('usr_level', 'make_usr_level');
  $tblUsers->onAddExecuteCallBackFunction("AddCallBack");
  $tblUsers->addButtonToRow("Dettagli", "UserDetails.php");
  $tblUsers->addButtonToRow("Collega case", "HousesList.php"); 
  $tblUsers->setLimit(30);
  #my self-defined functions used for formatFieldWithFunction
  function make_usr_level($val){
    return FAUser::LevelToString($val);
  }  
  function AddCallBack($array)
  { 
    //these indexes are the fields of the db
    $success = qr("INSERT INTO tbl_users 
                    ( usr_id, 
                      usr_name, 
                      usr_surname, 
                      usr_pwd, 
                      usr_level )
                   VALUES (NULL, 
                           '" . $array[usr_name] . "', 
                           '" . $array[usr_surname] . "', 
                           AES_ENCRYPT('" . $array[usr_pwd] . "', 
                                       SHA2('FonteAlma_2013', 512)), 
                           " . $array[usr_level] . ");");
  }
  #actually show to the table
  $tblUsers->showTable();
?>  

该表正确显示并显示已插入的用户，但是当我添加新用户时，我得到：

4 - TheGivenName - TheGivenSurname - [BLOB - 7 B] - 0

因此，密码和用户级别设置不好。

此外，当我将级别字段编辑到表中时，这是一个包含三个级别的组合框，无论我选择什么值，我总是得到 0。

我错在哪里？

问候。