这种方法可以取得非常快的性能，但是要花一定的精力来确保这种方法在有多个数据类型、代码页等等的情况下也能十分有效。
This approach can achieve very fast performance but does require some effort in ensuring that it works perfectly despite multiple data types, code pages, and so on.
Ajax请求受到一个PHP驱动程序页的保护，该页先确保请求有效，然后将其传递到一个处理该请求的数据库包装类。
The Ajax requests are fielded by a PHP driver page, which makes sure that the request is valid and then passes it onto a database wrapper class that handles the request.
在执行时，当建立数据库连接时，确定用户应用程序代码页，而且它只在连接期间有效。
At execution time, the user application code page is established when a database connection is made, and it is in effect for the duration of the connection.
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