~/.inputrc 文件很简单，只有4种语句： 注释 变量设置语句(set variable value) 键绑定('keyseq':function) 条件语句($if ..
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毫无疑问，最常见的调试步骤是设置断点，这样可以检查条件语句或循环内的变量和值。
Undoubtedly, the most common debugging procedure is to set breakpoints that will allow the inspection of variables and the values inside conditional statements or loops.
DB 2在执行语句时将隐式地设置这些变量。
DB2 implicitly sets these variables whenever a statement is executed.
如果在第二个try语句运行期间抛出异常，那么请注意，result变量被设置为false。
If an exception is thrown during the second try statement, notice that the result variable gets set to false.
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