check conditional 校验条件
These two steps allow me to effectively remove the conditional check in the validate method and let OVal do it for me, as shown in Listing 11.
这两步让我能够有效地去除validate方法中的条件检验，让OVal为我完成这些，如清单11所示。
Then you use the conditional if statement to check the return code of the command.
然后，您使用条件型if语句，以检查该命令的返回代码。
Connect the first data flow operator to the second using the green check mark in the upper right corner to make a conditional connection.
使用右上角的绿色对勾把第一个数据流操作符连接到第二个，这会建立有条件连接。
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