使用XPath表达式自动填充字段。
可用自动搜索和客户端，谁已经进入到数据库的自动填充字段。
Available is an automatic search and auto-field filling for a client, who has already been entered to the database.
通过在保存方法中添加审计逻辑，使用这个dao保存的任何对象都会自动填充审计字段。
By adding the auditing logic to the save method, any object saved using the DAO will automatically have the auditing fields filled in.
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