Grails Domain - get read save

//调用后，数据库会更新
    def show(Long id) {
        def c = Company.get(id)
        c.name = 'testtest'
        [company: c]
    }

    def show(Long id) {
        def c = Company.findById(id)
        c.name = 'test2'
        [company: c]
    }

    def show(Long id) {
        def c = Company.read(id)
        c.name = 'testtest'
        c.save()
        [company: c]
    }


//调用后，数据库不会更新
    def show(Long id) {
        def c = Company.read(id)
        c.name = 'testtest'
        [company: c]
    }