Final summary of addition, deletion, modification and query - 2.1 (single table - addition, deletion, modification and query)

One 、 increase insert（ New data / Put in storage ）

       1、 law

All are The user submits in the browser form The form data Encapsulated in the js Object to pass parameters , stay controller Layer connection （user） The object is connected to
Be careful ：1、sql The statement did not where Conditions （ New data none id, Only after the addition is completed id You can use ）
           2、 No return value ,service Layer without return

        2、 Different frame writing

Multiple where Conditions ：controller Layer encapsulates it as an object （user） coming

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               1）mybatis frame

service Layer interface

void saveUser(User user);

service Layer interface implementation class

 @Override
    public void saveUser(User user) {
            user.setPassword(md5Pass)
                .setStatus(true)
                .setCreated(date)
                .setUpdated(date);
        userMapper.saveUser(user);
    }

               1> How to write the mapping file

mapper Layer interface