Kettle switch / case control to realize classification processing

When doing data cleaning , It is often necessary to judge the value of a certain field according to the content of one or several fields .

As usual, for multiple fields, I pass java Script complete . however ~~~

java Scripts often have all kinds of strange problems , such as ecplise There's no problem running ,java There is an error in the script .

Fucking .jpg

So even if it's a little troublesome, I want to change to a successful one , Now switch / case Component matching Set the field value to a constant Components work .

 

The two are located in the process （switch / case）、 application （ Set the field value to a constant ）.

 

switch / case Component is introduced

1、Switch Field ： The field is passed from the previous step ; Select a field , We will judge according to the value of this field and proceed to the next step accordingly .

      chestnuts ： I choose the cancelReson Field .

2、 Use strings to contain comparisons ： Selective check . Not selecting represents accurate matching , Selection represents fuzzy matching .

      chestnuts ： as long as cancelReson Field contains Case Value will proceed to the corresponding step .

3、Case Value data type ： Judge the type of the field according to its own value type .

      

      Field type and java The corresponding me of type relation Blog used to write .

4、Case value ： Criteria for judgment .

5、 Target steps ： Data processing according to the value .

Set the field value to a constant

1、 Field ： Fields need to follow  switch / case In components  switch / case Field Agreement .

2、 Value substitution ： Corresponding assignment .

3、 Transform mask （ For date type ）： Format date type data .

     

4、 Set as empty string ？： Whether to set the corresponding value to null .