它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。
They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.
可以根据需要详细地定义规则，规则可以包含各种参数，从用户名和数据库类型到命令、时间段和计数。
Rules can be made as detailed as necessary and can include a wide range of parameters-from user names and database type to command, time period, and counts.
在数据库端，我也定义一个CHAR40字段。
On the database side I also have the field defined as a CHAR40.
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