接收到的错误数据包数 Packets received errors
这就是SAX的真正用途所在：在程序中断处理过程并进行修复之前，允许接收可能错误的数据或者错误状态。
That's where SAX can really help: it allows you to receive possibly bad data or error conditions before the program halts processing and gives you a chance to make course corrections.
这个常见的错误消息指示所接收或发送的数据不是所预期的数据。
This common error message indicates that the data being received or sent is not what is expected.
现在，如清单20所示，当用户重新连接到数据库，并试图访问表时，将接收到错误消息。
Now, as shown in Listing 20, when users reconnect to the database and try to access the table, they receive an error.
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