最后， 清单 4 展示了针对机器的代码。

Finally, Listing 4 shows the code for the machine reader.

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如果您无法通过示例代码显示出这个清单，可能您的机器未使用PEAR存储库安装DB模块。

If you don't get this listing from the example code, perhaps you haven't installed the DB module from the PEAR repository.

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在集群中的所有机器上运行清单4中所示的命令。

Run the command shown in Listing 4 on all machines in this cluster.

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