该程序输出一行数据，其中包含指定客户的所有 XML 联系信息。
This program prints a single row of data containing all the XML contact information for the specified customer.
query字符串包含一个简单的sql语句来选择指定客户的所有联系信息。
The query string contains a simple SQL statement to select all contact information for a specific client.
但是，要为某个指定客户找到所有帐户就比较困难了，因为该客户可能有多个过去创建的帐户。
It is more difficult to locate all the accounts for a specific customer since this customer may have multiple accounts that were created over time.
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