package Ġcom . memory a . framework . room . dao Ċ Ċ import Ġandroidx . lifecycle . LiveData Ċ import Ġandroidx . room .* Ċ import Ġcom . memory a . framework . room . entities . Category Entity Ċ Ċ @ Dao Ċ interface ĠCategory Dao Ġ{ ĊĠĠĠ Ġ@ Insert ĊĠĠĠ Ġsuspend Ġfun Ġinsert Category ( category Entity : ĠCategory Entity ): ĠLong ĊĊĠĠĠ Ġ@ Update ĊĠĠĠ Ġsuspend Ġfun Ġupdate Category ( category Entity : ĠCategory Entity ) ĊĊĠĠĠ Ġ@ Delete ĊĠĠĠ Ġsuspend Ġfun Ġdelete Category ( category Entity : ĠCategory Entity ) ĊĊĠĠĠ Ġ@ Query (" SELECT Ġ* ĠFROM Ġcategory ĠORDER ĠBY Ġcategory ") ĊĠĠĠ Ġfun Ġget Categories As LiveData (): ĠLive Data < List < Category Entity >> ĊĊĠĠĠ Ġ@ Query (" SELECT Ġ* ĠFROM Ġcategory ĠWHERE Ġid Ġin Ġ( SELECT Ġcategory ĠFROM Ġvocabulary _ item ) ĠORDER ĠBY Ġcategory ") ĊĠĠĠ Ġfun Ġget NotEmpty Categories As LiveData (): ĠLive Data < List < Category Entity >> ĊĊĠĠĠ Ġ@ Query (" SELECT Ġ* ĠFROM Ġcategory ĠORDER ĠBY Ġcategory ") ĊĠĠĠ Ġsuspend Ġfun Ġget Categories (): ĠList < Category Entity > ĊĊĠĠĠ Ġ@ Query (" SELECT Ġ* ĠFROM Ġcategory ĠWHERE Ġid Ġ== Ġ: id ") ĊĠĠĠ Ġsuspend Ġfun Ġget Category ById ( id : ĠInt ): ĠCategory Entity Ċ }