//数据类型常量
var DT_STRING = "string";
var DT_NSTRING = "nstring";
var DT_NCHAR = "nchar";
var DT_CHAR = "char";
var DT_INT = "int";
var DT_NUMERIC = "numeric";
var DT_TEXT ="text";
var DT_NTEXT = "ntext";
var DT_DATETIME = "datetime";

//格式常量
var STRING = "string";
var LONGSTRING = "longString";
var DATE = "date";
var DIGIT = "digit";
var TEXT = "text";
var SELECT = "select";

//年份常量
var YEAR_MAX = "2199";
var YEAR_MIN = "1900";

//数字常量
var MAX = 2147483647;
var MIN = -2147483648;