Stage a -02 classification, recommendation, search, evaluation, shopping cart development - Chapter 2 Product recommendation + Search function realization -2-4 Search - write product related inquiries service

Write back-end code, the first to start writing from the service layer.

It is our intention to query all and commodity-related, are single-table queries. Here we use the generic Mapper on it.

service layer

ItemServiceImpl renamed copy of a




class that implements the change about


four methods are written first service request.

serviceImpl implementation class

Ctrl + Alt + O can be used to reference the package without removing the


primary key query word

are injected in, the other three Mapper classes





all query methods are used supports things level

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